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Relevant bibliographies by topics / Ions – Purification

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Academic literature on the topic 'Ions – Purification'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Ions – Purification"

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Trokhymenko, Ganna, and Mykola Gomelya. "DEVELOPMENT OF LOW WASTE TECHNOLOGY OF WATER PURIFICATION FROM COPPER IONS." Chemistry & Chemical Technology 11, no. 3 (2017): 372–77. http://dx.doi.org/10.23939/chcht11.03.372.

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Maharramov, A. M., M. R. Bairamov, G. M. Askarova, et al. "PURIFICATION OF WATER FROM URANYL-IONS BY NEW SORBENT OF CARBOXYLATE TYPE." Chemical Problems 16, no. 3 (2018): 323–30. http://dx.doi.org/10.32737/2221-8688-2018-3-323-330.

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Alaferdov, A. F., and T. A. Kharlamova. "Groundwater purification from Fe(II) ions." Mining informational and analytical bulletin, S1 (2020): 279–85. http://dx.doi.org/10.25018/0236-1493-2020-1-1-279-285.

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Porozhnyuk, L. A., N. S. Lupandina, and E. V. Porozhnyuk. "Research of Mechanisms of Copper Ions Removal out of Sewage of Machine-Building Productions by Combined Reagent Based on Industrial Wastes." Solid State Phenomena 265 (September 2017): 851–55. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.851.

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The need for sewage purification of machine-building production from copper compounds which possess toxic, allergic, cancerogenic, gonadotropny and embryotoxic action, has been justified. The methods of studying of component and mineralogical composition of wastes, which are used for purification of model mortars, have been given. Some methods of purification of mortars from copper ions have been considered. The need for the search of alternative methods of purification, taking into consideration the composition and properties of the purified environments, and also taking into account the possible reset of purified sewage into natural reservoirs, has been shown. It has been revealed, that application of calcium- containingwaste as reagent won't help to additional alkalization of natural reservoirs. Prospects of use of regional industrial wastes for extraction of copper ions out of model mortarshave been shown. The mechanism of purification of model drains from copper ions by a combined reagent has been described.

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Андреюк, С. В. "ВЛИЯНИЕ СУЛЬФАТ-ИОНОВ НА ЭФФЕКТИВНОСТЬ ИОНООБМЕННОЙ ОЧИСТКИ ПОДЗЕМНЫХ ВОД ОТ НИТРАТОВ". Vestnik of Brest State Technical University. Civil Engineering and Architecture, № 2-2020 (25 липня 2020): 34–36. http://dx.doi.org/10.36773/1818-1212-2020-120-2.1-34-36.

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В статье содержатся результаты экспериментальных исследований по изучению влияния анионного состава подземных вод на эффект удаления нитратов методом ионного обмена. Задачей экспериментальных исследований являлось получение зависимостей остаточной концентрации нитратов от анионного состава исходной воды (содержания хлоридов, гидрокарбонатов, сульфатов) с построением треугольных диаграмм и использованием метода оптимального планирования многофакторного эксперимента. Полученная экспериментально-статистическая модель процесса ионообменной очистки воды от нитратов позволяет количественно определить значения остаточной концентрации нитратов при любом исходном содержании сопутствующих анионов подземных вод. Наибольшую конкуренцию по отношению к нитрат-ионам в ионообменном процессе составляют сульфат-ионы.

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Обуздина, Marina Obuzdina, Руш, E. Rush, Шалунц, and L. Shalunc. "Sorption Purification of Effluent Water From Heavy Metal Ions by Modified Natural Zeolites." Safety in Technosphere 6, no. 2 (2017): 56–61. http://dx.doi.org/10.12737/article_598d7af88ce043.55438902.

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Features of sorption method of effluent water purification are considered. Analysis of technologies of effluent water purification from heavy metalsionsis presented. Physico-chemical regularities of sorption of Zn, Ni, Cu ions are investigated. As sorbents it is proposed to use zeolites of Holinsky deposits, modified by sulfur polymer, obtained from waste of epichlorohydrin production. This will allow simultaneously solving two problems: elimination of waste and wastewater purification, which is significantly advantageous from the economic point of view. Kinetic curves of sorption of Zn, Ni, Cu ions in different solution concentrations are presented. Also the adsorption process of heavy metal ions from solutions of chemically modified zeolites in the evaluation of the influence of various factors (the contact time of sorbent with solution, pH and temperature) are investigated.

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Suzuki, Kenzi, and Chun Shan Li. "Hydroxyl Sodalite Having Combustion Gas Purification Function." Applied Mechanics and Materials 749 (April 2015): 25–29. http://dx.doi.org/10.4028/www.scientific.net/amm.749.25.

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Hydroxyl sodalite (Na8Al6Si6O24(OH)2) was investigated to develop a new ecofunctional material having removal performance for toxic substances including in combustion gas. Hydroxyl sodalite has nanometer-sized micro pore (β-cage) in the structure, and Cl- ions derived from HCl gas were fixed in the pores above 400 °C. The amount of Cl- ion fixed increased with increasing reaction temperature, and was the greatest, 7.3 wt% at 800 °C. In addition, it was found that Cu2+ ions were fixed in sodalite structure by substitution with Na+ ions by solid (hydroxyl sodalite) - gas (gaseous CuCl2) reaction. The substitution quantity increased with increasing reaction temperature. The amount of Cu2+ ion substituted was 10.5 wt% as CuO at 900 °C. From the above results, it was concluded that hydroxyl sodalite is an ecomaterial which is useful for combustion gas purification in the high temperatures.

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Boriskov, Dmitry, Sanya Efremova, Nadezhda Komarova, Elena Tikhomirova, and Aleksey Bodrov. "Applicability of the modified diatomite for treatment of wastewater containing heavy metals." E3S Web of Conferences 247 (2021): 01052. http://dx.doi.org/10.1051/e3sconf/202124701052.

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The paper studies various modifications of diatomite, aiming at creating sorbents for wastewater purification from heavy metal ions. Diatomite of the Akhmatovskoe deposit of the Penza region was considered as a raw material. The processes of physical and chemical modification of diatomite were investigated. Adsorption isotherms were constructed, quantitative characteristics of adsorption of copper ions on the surface of modified sorbents were obtained. A chemical modification (acidic and alkaline) is proposed, which results in an increased adsorption capacity for heavy metal ions. The applicability of diatomite for the purification of highly concentrated wastewater containing heavy metals is shown.

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Klishchenko, R. E., R. D. Chebotareva, and V. V. Goncharuk. "Electromigration purification of galvanic sludge of copper ions." Journal of Water Chemistry and Technology 32, no. 4 (2010): 206–11. http://dx.doi.org/10.3103/s1063455x1004003x.

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Joshi, A. R., Abhay V. Patil, and U. M. Kasar. "Studies on purification of plutonium from silver ions." Journal of Radioanalytical and Nuclear Chemistry 286, no. 1 (2010): 67–69. http://dx.doi.org/10.1007/s10967-010-0632-3.

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Dissertations / Theses on the topic "Ions – Purification"

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Wu, L. "The preparation of metal ions modified titanium dioxide and its application in water purification and disinfection." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/19578/.

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Conventional water purification and disinfection generally involve potential hazardous substances, some of which known to be carcinogenic in nature. Titanium dioxide photocatalytic processes provide an effective route to destroy hazardous organic contaminants and bacteria, being operational in the UV domain with a potential application in the use of solar radiation. This work explores the possibility of the removal of organic pollutants and microbial contaminant by the application of TiO2 based photocatalysts. The production of series of metal ions doped or undoped TiO2 were carried out by sol gel method and wet impregnation method. Photoreactivity tests were carried out in a solar box with two UVA lamps. The photodegration of phenol and photodisinfection of E. coli in aquatic solution were selected as probe as a measure of photoreactivity. It is found that none of the doped TiO2 show any improvement compared with undoped TiO2 towards phenol degradation. In contrast, Cu doped TiO2 exhibits enhanced results from E. coli photodisinfection. The material properties of prepared photocatalysts were characterized in an attempt to understand the relation among preparation parameters (calcination temperature, the variations of dopant and the level of doping, etc.), material properties and the final photoactvity. The structural characterization includes Brunauer, Emmett and Teller (BET) method, X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and X-ray Photoelectron Spectroscopy (XPS). Some field simulation experiments are also included in this research. The results of which proved TiO2 based photocatalytic process to be a promising alternative in the future application in water disinfection and degradation, especially in those tropical developing countries with abundant of solar irradiation and insufficient water sanitation. In the last part of this PhD work, a continuous flow photoreactor was designed. The effectiveness of the system was tested and fitted to mathematical models to describe the bacterial disinfection rate.

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Ledder, Tracey. "Comparison of ion chromatography and flow injection analysis methods for monitoring chlorite and chlorate ions in drinking water." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-03172010-020312/.

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Landeen, Lee Kevin 1965. "Inactivation of Legionella pneumophila by copper-silver ions and free chlorine." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276997.

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Water disinfection systems utilizing electrolytically generated copper:silver ions (200:20 to 400:40 ug/L) and low levels of free chlorine (0.1 to 0.4 mg/L) were evaluated at room (21-23°C) and elevated (39-40°C) temperatures in filtered well water (pH 7.3) for their efficacy in inactivating Legionella pneumophila (ATCC 33155). A contact time of 24 hr was necessary for copper:silver (400:40 ug/L) to achieve a 3 log₁₀ reduction in bacterial numbers at room temperature. As the copper:silver concentration increased to 800:80 ug/L (K = 7.50 x 10⁻³ log₁₀ reduction/min), the inactivation rate significantly (p ≤ 0.05) increased. In water systems at room temperature with and without copper:silver (400:40 ug/L), the inactivation rates significantly increased as the free chlorine concentration increased from 0.1 mg/L (K = 0.397 log₁₀ reduction/min) to 0.4 mg/L (K = 1.047 log₁₀ reduction/min). All disinfection systems, regardless of temperature or free chlorine concentration, showed increased inactivation rates when 400:40 ug/L copper:silver was added; however, this trend was significant only at 0.4 mg/L free chlorine.

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Mack, Cherie-Lynn. "Screening of technologies for the recovery of rhodium (III) metal ions from a precious metal refinery wastewater." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1004046.

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The selective recovery of rhodium from wastewaters, in which the metal would be otherwise lost, would be highly profitable if the process were suitably low-cost. Current recovery processes are generally high maintenance and high-cost, whereas biological processes can be engineered to run with little external input in terms of cost and maintenance. Three emerging technologies were chosen based on their reported efficiency when removing base metals from wastewaters. The first technology screened, the sulphide-extraction membrane bioreactor (SEMB), consists of a sulphate-reducing prokaryote (SRP) anaerobic digester, in which a silicone membrane is submerged. Wastewater is passed through the membrane and metal ions are precipitated as metal sulphides by the hydrogen sulphide gas, which is capable of permeating the membrane. The second technology screened was a fluidized sand bed reactor in which metal ions are removed from solution via induction of nucleated precipitation by sodium carbonate onto the sand grains. The third, and most well established removal technology screened was a biosorption system using immobilized Saccharomyces cerevisiae biomass as the biosorbent. Experimental trials with each technology highlighted drawbacks with each; the SEMB system proved to be largely ineffective when challenged with the removal of rhodium from the wastewater as the rhodium precipitate fouled the membrane within hours, the fluidized bed system seemed unable to overcome the acidity of the wastewater and thus could not precipitate out the rhodium metal, and the efficiency of the biosorption process was hampered by the diversity of rhodium species present in the wastewater, which reduced the amount recovered. The outcomes of the trials with each technology indicated that further optimization of the technology or pretreatment of the wastewater is necessary before any of these options can be implemented. It could be concluded, however, that despite further optimization, both the SEMB and the fluidized bed system were not applicable in this case as precipitation would be non-specific, resulting in the necessity for further steps in order to purify the rhodium ions. Hence, the biosorption system was shown to be most applicable, and further optimization of the system could yield a highly efficient rhodium recovery process.

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Stoll, Anita. "Bioaccumulation of heavy metals by the yeast S. cerevisiae and the bioremediation of industrial waste water." Thesis, Rhodes University, 1997. http://hdl.handle.net/10962/d1004075.

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Water is an essential element in all aspects of life and is vital for both domestic and industrial purposes regarding both the quality and quantity thereof. Similar to many other drought stricken countries, South Africa requires water for the socio-economic growth of the country, yet is faced with the problem of maintaining the quality of its drinking water as well as protecting the dwindling supplies. In an attempt to prevent the deterioration of South African water supplies the treatment, purification and recycling of industrial and mining waste water has recently become of prime importance. Many industrial and mining waste waters contain heavy metals in toxic quantities. The conventional processes that have been used till recently to address this problem, are often expensive or contain chemical agents which compound the environmental problem. As an alternative biological methods of metal accumulation appear to offer an economic and efficient alternative to these methods. An advantage to the South African scenario is the commercial production of the yeast, S. cerevisiae as a readily inexpensive by-product from some fermentation industries, Yeast cells, and in particular S. cerevisiae have proven to be capable of accumulating heavy metals, and therefore exhibit potential application in the bioremediation of waste water. The aim of this project was twofold. The initial part of this work attempted to define the mechanisms of metal accumulation by the yeast cells and cellular components. The information obtained from these initial studies provided a data base required for the development of a bioremediation system. Initial contact with the metal ions occurs at the wall interface of the yeast cell. Metal accumulation appears to be a function of all the cell wall components. The isolated cell wall components are better metal chelators then the intact cell walls. An apparent affinity series of mannan > chitin> glucan > intact cell walls exists. However, these components differ in their affinities for metal ions. Storage of metal ions within the cell occurs predominantly in the vacuole. The present study concluded that metal accumulation by the vacuole could be related to size. Metal accumulation occurred in the order of Cu2+ > Co2+ > Cd2+ with a corresponding decrease in atomic radii of Cd2+ > C02+ > Cu2+. Vacuolar ion deposition occurs at an early stage during the internalization of metal ions within the yeast cells. At the onset of vacuolar saturation, depositions of metal ions as granules within the cytosol occurs. In the presence of heavy metal cations viable yeast cells can be shown to exhibit two types of cellular responses. Uptake of Cu2+ and Cd2+ causes the loss of intracellular physiological cations from within the yeast cell. In comparison, uptake of Co2+ into the cell does not have this effect. All three heavy metal cations initiate plasma cell membrane permeability, thus the Cu2+ and Cd2+ induced loss of the intracellular cations, occurs. ~ a result of ion-exchange mechanisms and not due to cation leakage brought about by membrane permeabilization. Uptake of heavy metals by viable yeasts appears to be generally non-selective though the amount of metals accumulated are largely affected by the ratio of ambient metal concentration to biomass quantity. In addition, the energy dependent nature of internalization necessitates the availability of an external energy source for metal uptake by viable yeast cells. For these reasons metal removal from industrial waste water was investigated using non-viable biomass. By immobilizing the yeast cells additional mechanical integrity and stability was conferred apon the biomass. The three types of biomass preparations developed in this study, viz. polyvinyl alcohol (PV A) Na-alginate, PV A Na-orthophosphate and alkali treated polyethylenimine (PEI):glutaraldehyde (GA) biomass pellets, all fulfilled the necessary physical requirements. However, the superior metal accumulating properties of the PEI:GA biomass determined its selection as a biosorbent for bioremediation purposes. Biosorption of heavy metals by PEI:GA biomass is of a competitive nature, with the amount of metal accumulated influenced by the availability of the metal ions. This availability is largely determined by the solution pH. At low pH values the affinity of the biomass for metals decreases, whilst enhanced metal biosorption occurs at higher pHs, ego pH 4.5 - 6.0. PEI:GA biomass pellets can be implemented -as a biosorbent for the bi9remediaiton of high concentration, low-volume metal containing industrial waste. Several options regarding the bioremediation system are available. Depending on the concentration of the metals in the effluent, the bioremediation process can either be used independently or as part of a biphasic remediation system for the treatment of waste water. Initial phase chemical modification may be required, whilst two types of biological systems can be implemented as 'part of the second phase. The PEI:GA biomass can either be contained within continuous-flow fixed bed tanks or continuous-flow stirred bioreactor tanks. Due to the simplicity of the process and the ease with which scale-up is facilitated, the second type of system shows greater application potential for the treatment of this type of industrial waste water than the fixed-bed systems.

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Mourão, Cecília Alves 1989. "Purificação de fragmentos Fab humano em níquel, cobre, cobalto e zinco quelatados ao CM-Asp." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266104.

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Orientador: Sonia Maria Alves Bueno<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-25T09:14:39Z (GMT). No. of bitstreams: 1 Mourao_CeciliaAlves_M.pdf: 2559584 bytes, checksum: efe6b17b9b7e5ceb16ade74a6ae30629 (MD5) Previous issue date: 2014<br>Resumo: As imunoglobulinas G (IgG) e seus fragmentos Fab, F(ab)¿2 e Fv apresentam aplicações proeminentes nas áreas terapêuticas e de diagnósticos. Em determinadas situações em que a região Fc é dispensável e/ou deletéria, emprega-se preferencialmente fragmentos em relação à IgG não clivada. Tais aplicações requerem um elevado grau de pureza dessas biomoléculas. O elevado custo de obtenção de fragmentos pelas técnicas convencionais justifica a investigação de outras que possam proporcionar a obtenção dessas proteínas, combinando um menor custo com um elevado grau de pureza. Neste sentido, o objetivo deste trabalho foi avaliar e comparar a eficácia dos adsorventes agarose-CM-Asp-Ni(II), agarose-CM-Asp-Co(II), agarose-CM-Asp-Cu(II) e agarose-CM-Asp-Zn(II) na purificação dos fragmentos Fab de IgG humana policlonal, a partir de uma solução de IgG clivada pela enzima papaína. O efeito do sistema tamponante, do íon metálico e do cloreto de sódio foram avaliados. A seletividade das condições cromatográficas foi avaliada por eletroforese SDS-PAGE, Western Blotting e imunodifusão radial. Os resultados indicaram que nas cromatografias conduzidas com o quelato CM-Asp-Co(II) com Hepes e Tris-HCl, na ausência de sal, os fragmentos Fab foram obtidos separados do Fc nas frações de eluição. Nas cromatografias em CM-Asp-Ni(II) com Hepes e fosfato de sódio na presença de NaCl e em CM-Asp-Cu(II) com Tris-HCl e fosfato de sódio na presença de NaCl, a biomolécula alvo foi obtida seletivamente nas frações não retidas (cromatografia negativa). Nas cromatografias em CM-Asp-Zn(II) não houve a recuperação seletiva dos fragmentos Fab. Os resultados das curvas de ruptura com os quelatos CM-Asp-Ni(II), CM-Asp-Co(II) e CM-Asp-Cu(II) revelaram a recuperação de 3,4 mg, 17,1 mg e 8,6 mg de Fab, respectivamente. Os fragmentos Fab foram obtidos com pureza superior a 90%, sendo que para o ligante CM-Asp-Cu(II), segundo o western blot, os fragmentos Fab foram separados da IgG não clivada. Os resultados obtidos nas condições cromatográficas estudadas evidenciam a potencialidade do emprego dos quelatos CM-Asp-Ni(II), CM-Asp-Co(II) e CM-Asp-Cu(II), imobilizados em agarose, para purificação de fragmentos Fab obtidos da clivagem enzimática da IgG humana policlonal<br>Abstract: Immunoglobulins G (IgG) and their fragments Fab, F(ab)¿2 and Fv are prominently applied as therapeutic and diagnostic tool. Fragments are preferably used rather than the uncleaved IgG, specially when the Fc portion is dispensable or prejudicial. For the mentioned applications, high purity preparations are required. The high costs associated with the conventional downstream processing of these biomolecules is the driving force to investigate purification techniques that can combine lower cost with high purification factor. Therefore, the goal of this work is to evaluate and compare the efficiency of CM-Asp-Ni(II), CM-Asp-Co(II), CM-Asp-Cu(II) and CM-Asp-Zn(II) adsorbents in the purification of Fab fragments from papain-digested human IgG. The effects of buffers, metal-ion and NaCl addition were also studied. The adsorbent/buffer selectivity towards the targeted molecule was evaluated by SDS-PAGE, Western Blotting and radial immunodiffusion assays. Chromatography with CM-Asp-Co(II) as chelated using Hepes and Tris-HCl buffers resulted in Fab recovery in the elution fractions. Whereas the chromatography with CM-Asp-Ni(II) and CM-Asp-Cu(II) both as chelated using Hepes sodium phosphate buffers with NaCl addition resulted in Fab selective recovery in non-retained fractions (negative chromatography). The adsorbent CM-Asp-Zn(II) did not show Fab selective recovery. Breakthrough curves experiments with CM-Asp-Ni(II), CM-Asp-Co(II) e CM-Asp-Cu(II) showed recovery of 3.4 mg, 17.1 mg and 8.6 mg of Fab, respectively. Fab fragments were recovered with purity higher than 90%. When chelated CM-Asp-Cu(II) was use as ligand, Fab fragments were recovery separated from intact IgG as shown in western blot. Results obtained in the chromatographic conditions studied showed the potential use of CM-Asp-Ni(II), CM-Asp-Co(II) and CM-Asp-Cu(II) immobilized in agarose for the purification of Fab fragments from cleaved human polyclonal IgG<br>Mestrado<br>Desenvolvimento de Processos Biotecnologicos<br>Mestra em Engenharia Química

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Mathieu, Catherine. "Élaboration d'un procédé industriel d'élimination de si, al et cr des bains acides de chlorure de fer et étude de l'influence du silicium sur les propriétés magnétiques des ferrites." Nancy 1, 1993. http://www.theses.fr/1993NAN10292.

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La première partie de cette thèse concerne l'élaboration d'un procédé de purification des bains chlorhydriques industriels de décapage des tôles d'acier et la mise au point d'une installation piloté en vue de la fabrication de ferrites doux. La méthode a pour but d'abaisser les teneurs en si, al et cr du bain. Elle consiste en la neutralisation de l'acidité libre des bains acides de chlorure ferreux par adjonction de fer métal, sous formes de rives d'acier résiduelles de l'industrie sidérurgique, jusqu'a un ph de 4. Cette valeur est celle d'une solution concentrée de fe(h#2o)#6#2#+, elle correspond au ph de précipitation des gels d'hydroxydes des ions plus acides que fe#2#+, soit ici les ions tri- et tétravalents que sont fe#3#+, al#3#+, cr#3#+ et si#4#+. Une opération de filtration permet ensuite l'élimination de ces espèces hydroxylées. Dans la deuxième partie, nous avons montré que l'oxydation de la fayalite silicate ferreux de formule fe#2sio#4 conduit a un fe#2o#3 ou la transition de Morin observée par spectrométrie Mössbauer est partiellement inhibée; puis nous avons démontré que le silicium s'insère dans le réseau spinelle de préférence en site tétraédrique pour former la solution solide de formule générale m#i#i#1##xfeii#2#xfeiii#2##2#xo#4 ou m#i#i est un cation métallique divalent

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Lavoie, Jean-Philippe. "Production of pure ion beams by laser ionization and a fast release RFQ." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27202/27202.pdf.

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Laporte, François. "Caractérisation et purification d'une NADPH cytochrome c réductase des granulocytes neutrophiles de lapin impliquée dans la production des ions superoxyde au cours de la phagocytose." Grenoble 1, 1990. http://www.theses.fr/1990GRE10038.

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La membrane plasmique des granulocytes neutrophiles contient une oxydase capable, quand les cellules ont ete stimulees, de produire des ions superoxyde. Ces ions sont impliques dans la destruction des microorganismes au cours de la phagocytose. Nous avons caracterise dans la membrane plasmique des neutrophiles de lapin, une enzyme qui possede une activite nadph cytochrome c reductase. Un certain nombre de resultats experimentaux montrent que cette enzyme participe a la production des ions superoxyde. Nous avons defini des conditions qui permettent de conserver ou de restaurer l'activite de production d'ions superoxyde dans les membranes, soit en reticulant les cellules par le glutaraldehyde, soit en traitant les membranes avec de l'acide arachidonique. La transformation de l'activite nadph cytochrome c reductase en activite nadph oxydase est reversible, et resulte de l'interaction plus ou moins forte de la reductase avec d'autres proteines membranaires et sans doute cytosoliques. La nadph cytochrome c reductase a ete purifiee: il s'agit d'une flavoprotoeine de 77 kd distincte du cytochrome b. Les caracteristiques cinetiques de cette proteine ont ete etudiees, et nous avons montre que l'addition de la reductase purifiee a un extrait soluble de la membrane plasmique, permet d'augmenter notablement la production des ions superoxyde par cet extrait, apres activation. Les caracteristiques biochimiques de cette enzyme montrent une grande similitude avec celles de la nadph cytochrome p-450 reductase des microsomes. Cependant, il parait probable que la reductase de ces membranes fonctionne en association avec le cytochrome b#5#5#8 pour produire des ions superoxyde

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Moore, Bronwyn Ann. "Metal bioaccumulation and precious metal refinery wastewater treatment by phoma glomerata." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1009441.

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The biosorption of copper, nickel, gold and platinum from single metal aqueous solutions by the nickel hyperaccumulator Berkheya coddii plant biomass was investigated. Potentiometric titrations of the biomass and determination of optimal sorption pH for each metal showed that nickel ions were released from the biomass into solution. The presence of free nickel ions interfered with the uptake of the other three metals and further biosorption investigations were discontinued. Three fungal isolates found colonising metal solutions were cultured and screened for their ability to remove 50 mg.l⁻¹ of copper, nickel, gold and platinum from solution and to survive and grow in precious metal refinery wastewaters. One isolate was selected for further studies based on its superior metal uptake capabilities (35 and 39 mg.l⁻¹ of gold and platinum, respectively) and was identified as Phoma glomerata. Copper, nickel, gold and platinum uptake studies revealed that nickel and gold were the most toxic metal ions, however, toxicity was dependent on pH. At pH 6 more biomass growth was achieved than at lower pH values and metal uptake increased by 51 and 17 % for copper and nickel, respectively. In addition, the production of extracellular polymeric substances played a role in base metal interaction. Precious metals were observed to be preferentially removed from solution, complete removal of gold and platinum was observed at all initial pH values, 89 % of copper was bioaccumulated at an initial metal concentration of 55 mg.l⁻¹ (pH 6) and only 23 % of nickel was removed from solution under the same conditions. Metal bioaccumulation was confirmed through transmission electron microscopy and micro particle induced X-ray emission. The effect of P. glomerata immobilised in a packed bed reactor on precious metal refinery wastewaters was investigated. It was found that the fungal isolate was not able to remove the high salt and chemical oxygen demand concentrations found in the wastewaters, however due to its ability to survive and grow in undiluted wastewater and remove metal ions from solution it may be utilised as a metal detoxification step in the treatment process train.<br>PDFCreator Version 0.9.0<br>AFPL Ghostscript 8.53

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Books on the topic "Ions – Purification"

1

E, Etzel James, ed. Environmental ion exchange: Principles and design. CRC/Lewis Publishers, 1997.

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Ion exchange treatment of water. American Water Works Association, 2005.

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Łucjan, Pawłowski, ed. Wastewater treatment by ion-exchange. Spon, 1987.

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Wachinski, Anthony M. Ion exchange treatment of water. American Water Works Association, 2006.

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Wachinski, Anthony M. Ion exchange treatment for water. American Water Works Association, 2006.

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Practical principles of ion exchange water treatment. Tall Oaks Pub., 1985.

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A, Greig J., ed. Ion exchange developments and applications: Proceedings of IEX '96. Royal Society of Chemistry, Information Services, 1996.

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Siegel, Susan K. Removal of chromium from ion exchange regenerant solution. U.S. Environmental Protection Agency, Water Engineering Research Laboratory, 1988.

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Maneval, James E. Selenium removal from drinking water by ion exchange. U.S. Environmental Protection Agency, Water Engineering Research Laboratory, 1985.

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Maneval, James E. Selenium removal from drinking water by ion exchange. U.S. Environmental Protection Agency, Water Engineering Research Laboratory, 1985.

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Book chapters on the topic "Ions – Purification"

1

Nishikawa, Kazuo, and Matthew Cook. "Air Purification Technology by Means of Cluster Ions Generated by Plasma Discharge at Atmospheric Pressure." In Bioengineering in Cell and Tissue Research. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75409-1_26.

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Hansen, Per, and Gunnar Lindeberg. "Selective purification of synthetic peptides: Binding to immobilized Ni2+-ions via the α-amino group." In Peptides 1992. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1470-7_425.

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Lindeberg, G., and P. Hansen. "Purification of synthetic peptides by selective binding of the α-amine group to immobilized metal ions." In Peptides 1994. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-1468-4_196.

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Scopes, Robert K. "Separation by Adsorption II: Ion Exchangers and Nonspecific Adsorbents." In Protein Purification. Springer New York, 1994. http://dx.doi.org/10.1007/978-1-4757-2333-5_6.

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Berrios, M., J. A. Siles, M. A. Martín, and A. Martín. "Ion Exchange." In Separation and Purification Technologies in Biorefineries. John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118493441.ch6.

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Sapronova, Zh A., A. V. Svyatchenko, and L. V. Denisova. "Purification of Model Waters from Zinc Ions by Heat-Treated Leaves of Apricot (Prunus Armeniaca L.) and Horse Chestnut (Aésculus Hippocastanum L.)." In Lecture Notes in Civil Engineering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75182-1_20.

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Lee, James J., Duane F. Bruley, and Kyung A. Kang. "Manipulation of the Affinity Between Protein and Metal Ions by Imidazole and PHfor Metal Affinity Purification of Protein c from Cohn Fraction IV-1." In Advances In Experimental Medicine And Biology. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-74911-2_11.

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VELIZAROV, SVETLOZAR, MARIA A. REIS, and JOÃO G. CRESPO. "THE ION EXCHANGE MEMBRANE BIOREACTOR DEVELOPMENTS AND PERSPECTIVES IN DRINKING WATER TREATMENT." In Water Purification and Management. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9775-0_4.

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Grodzki, Ana Cristina, and Elsa Berenstein. "Antibody Purification: Ion-Exchange Chromatography." In Immunocytochemical Methods and Protocols. Humana Press, 2009. http://dx.doi.org/10.1007/978-1-59745-324-0_4.

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Harries, R. R., and M. Ball. "Equilibrium Versus Kinetics in Water Purification." In Recent Developments in Ion Exchange. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3449-8_40.

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Conference papers on the topic "Ions – Purification"

1

Gennadieva, A. M., S. Z. Kalaeva, and E. A. Koroleva. "PURIFICATION OF WASTE WATER FROM HEAVY METAL IONS USING MAGNETITE." In ДАЛЬНЕВОСТОЧНАЯ ВЕСНА - 2021. Комсомольский-на-Амуре государственный университет, 2021. http://dx.doi.org/10.17084/978-5-7765-1472-2_2021_104.

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Liu, Y., C. C. Havener, T. L. Lewis, et al. "Purification of Radioactive Ion Beams by Photodetachment in a RF Quadrupole Ion Beam Cooler." In NEGATIVE IONS, BEAMS AND SOURCES: Proceedings of the 1st International Symposium on Negative Ions, Beams and Sources. AIP, 2009. http://dx.doi.org/10.1063/1.3112542.

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Lisa R Wilken and Zivko L Nikolov. "Effect of Phytic Acid and Buffer Ions on Recombinant Human Lysozyme Purification." In 2009 Reno, Nevada, June 21 - June 24, 2009. American Society of Agricultural and Biological Engineers, 2009. http://dx.doi.org/10.13031/2013.27222.

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Sharopov, Utkirjon. "ELECTRON SPECTROSCOPIC CONTROL OF SURFACE CLEANING OF SILICON SUBTRATES." In International Forum “Microelectronics – 2020”. Joung Scientists Scholarship “Microelectronics – 2020”. XIII International conference «Silicon – 2020». XII young scientists scholarship for silicon nanostructures and devices physics, material science, process and analysis. LLC MAKS Press, 2020. http://dx.doi.org/10.29003/m1568.silicon-2020/97-100.

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Zhang, W., T. S. Fisher, D. J. Schilitz, and S. V. Garimella. "DSMC Simulation of Ion Generation in Atmospheric Air." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41803.

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The generation of ions in air has several useful applications, such as electrohydrodynamic (EHD) pumping, air purification and isolation breakdown prevention. In this paper, ion generation processes in atmospheric air are simulated using a Direct Simulation Monte Carlo (DSMC) method. Details of the collision model are discussed. A C++ code is developed to implement the Monte Carlo method with cross-section data compiled from the literature. Self-sustaining discharge and ionization can be reproduced in the simulation under sufficient voltage bias, and the associated trends obtained are similar to those predicted by Paschen’s curve for a parallel-plate configuration.

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Kylivnik, Yuriy, Svyatoslav Vuchkan, Ihor Syika, Hanna Vasylyeva, and Olexander Sych. "Purification of aqueous solutions from strontium ions by natural and synthetic sorbents under increased radiation background." In RAD Conference. RAD Centre, 2021. http://dx.doi.org/10.21175/rad.abstr.book.2021.11.4.

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Peterson, M. S., T. S. Fisher, S. V. Garimella, and D. J. Schlitz. "Experimental Characterization of Low Voltage Field Emission From Carbon-Based Cathodes in Atmospheric Air." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41775.

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Nanoscale carbon-based field-emitter materials exhibit excellent electron field emission properties, characterized by low turn-on voltages and high current densities. The use of these materials has not been previously considered for ion generation in air, yet these properties suggest that substantial ionization may occur at low voltages compared to conventional methods involving glow or arc gas discharges. Electron field emission from carbon-based materials, including polycrystalline diamond and carbon nanotubes, in atmospheric pressure air is experimentally characterized. Electric fields between 30 V/μm and 100 V/μm applied between the two terminals produce field-emitted electrons via quantum tunneling. These electrons then travel through the electric field colliding with neutral air molecules and occasionally ionizing them. This process can produce a self-sustained current flow (from fractions of picoamperes to microamperes) between the anode and cathode. The current remains stable at voltages lower than those predicted by Paschen’s curve for gaseous breakdown and ionization. Results indicate the presence of field emission from the cathode that aids in sustaining current at low voltages. The observed behavior suggests that this method can achieve efficient generation of ions for air purification and ionic flow pumping.

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Govers-Riemslag, J. W. P., M. H. J. Knapen, G. Tans, R. F. A. Zwaal, and J. Rosing. "STRUCTURAL AND FUNCTIONAL PROPERTIES OF A PROTHROMBIN ACTIVATOR FROM THE VENOM OF BOTHROPS NEUWIDI." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644321.

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The prothrombin activator from the venom of Bothrops neuwidi has been purified to homogeniety by gelfiltration on Sephadex G-100, ion-exchange chromatography on DEAE-Sephacel and metal-chelate affinity chromatography on an Epoxy-activated Sepharose 6B column loaded with ZnCl . The overall purification was about 200-fold, which indicates that the crude venom contains about 0.5 weight % of the prothrombin activator. The venom activator is a single chain protein with an apparent molecular weight of 60,000 dalton. It readily activated bovine prothrombin with a Km of 37.7 uM and a Vmax of 120 umoles prothrombin activated per min/mg of purified venom activator. Venom-catalyzed prothrombin activation was not accelerated by the accessory components of the prothrombinase complex i.e. phospholipids plus calcium-ions and Factor Va. The venom activator does not require added calcium-ions for the expression of its prothrombin-converting activity. Calcium ions do, however, affect the catalytic activity of the venom activator. At 2 mM CaCl there is a 2-fold increase of the rate of venom-catalyzed prothrombin activation. However, at higher CaCl concentrations there is a gradual decrease of the activity of the venom activator. Gelelectro-phoretic analysis of prothrombin activation indicated that the venom activator only cleaved the Arg 323-Ile 324 bond of bovine prothrombin since meizothrombin was the only product of prothrombin activation. The activator did not hydrolyze the chromogenic substrates S2222, S2337, S2238, S2366, S2302 or chromozym TH and its prothrombin converting activity was not inhibited by benza-midine, phenylmethylsulfonylfluoride, dansyl-glu-gly-arg-chloro-methylketone and soybean trypsin inhibitor. However, chelating agents such as EDTA, EGTA and o-phenanthroline strongly inhibited the enzymatic activity of the venom activator. The activity of chelator-treated venom activator could, however, be restored by the addition of an excess CaCl . These results indicate that the enzyme from Bothrops neuwidi does not belong to the serine proteases but has the properties of a metal proteinase. Thus, the activator differs remarkably from Factor Xa, but strongly resembles the prothrombin activator from the venom of Echis carinatus, both structurally and functionally.

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Parapia, L., A. Minford, and J. B. Hamilton. "MONOCLONAL PURIFIED FACTOR VIII:C (MONOCLATE) TREATMENT IN A PREVIOUSLY UNTREATED HAEMOPHILIA." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644846.

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Monoclate is a new generation of Factor VIII concentrate produced by purification using mouse monoclonal anti-Factor VIII:R antibody. As the- Factor VIII:C does not interact with the antibody it can be eluted by disrupting the Factor VIII:C - Factor VIII:R complex using a high concentration of calcium ions. The eluted Factor VIII:C is concentrated and purified. The method of manufacture has demonstrated efficacy in the elimination of infectious viral particles.The first “virgin” haemophiliac to be treated by this has completed 20 weeks follow-up. The patient, a child of 18 months with a Factor VIII:C level of 2.8%, was treated with 190 × 4 units of the Factor VIII concentrate for a severe cut of the lower lip.The HIV status has remained negative. The AST and ALT enzymes have remained within normal limits. Other parameters which have remained normal are Gamma GT, WBC and lymphocyte counts, T cell subsets and B cell ratios.The patient has remained well and no side effects have been noted. Mouse antibody titres are being carried out and the results will be presented at the conference.

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Artemev, Alexandr. "FLOCCULATION OF FINE APATITE AIMED AT REDUCING ENVIRONMENTAL WATER USE PROBLEMS IN MINERAL PROCESSING PLANTS." In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b1/v3/48.

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"Water treatment technologies involving pre-treated industrial effluents without transporting them to the tailing dump are of interest primarily from an environmental point of view, as they reduce the environmental burden. The paper studies the possibility of purification of process waters from apatite concentrate production from suspended particles and water-soluble impurities using polyacrylamide flocculants. By studying the processes of adsorption of H+ and OH- ions from aqueous solutions, the acid-base properties of the surface of the solid phase of the most polluted technological product - the drain of the apatite concentrate thickener - the mineral composition of which is 90% apatite have been studied. The influence of the reagents present in the processing technology on the quantitative ratio of acid-base centres on the apatite surface has been evaluated. It has been shown that the interaction of these reagents with the mineral creates prerequisites for a greater efficiency of the anionic flocculant. The electro-surface properties of apatite treated with various reagents were studied using the laser Doppler electrophoresis method. The mechanism of fixation of ions present in the dispersion medium on the surface of apatite was studied by infrared spectroscopy. In order to determine the conditions under which various flocculants are in the most ionized state, studies were conducted on the change in the viscosity of the polyelectrolyte solution at different pH values. The position of the isoionic point for samples of cationic and anionic flocculants in the presence of reagents used in the apatite flotation and dehydration of apatite concentrate was studied. A research has been carried out on ""model"" and real suspensions in circulating water for a number of cationic, anionic and nonionic flocculants. The kinetic and concentration dependences of the flocculating capacity of the studied reagents were determined, which confirmed the high efficiency of the anionic type reagents"

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Reports on the topic "Ions – Purification"

1

Pereira, C., G. F. Vandegrift, and J. L. Swanson. Preliminary evaluation of solvent-extraction and/or ion-exchange process for meeting AAA program multi-tier systems recovery and purification goals. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/805261.

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Outschoorn, Verena M. Solving the Neutrino Mass Mystery using Double Beta Decay. An Examination of the Feasibility of Xennoon Purification and Ion Capture and Release using an Electrostatic Probe. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/815648.

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