Relevant bibliographies by topics / Modified biochar

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Modified biochar'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Modified biochar"

1

Gezahegn, Sossina, Mohini Sain, and Sean Thomas. "Variation in Feedstock Wood Chemistry Strongly Influences Biochar Liming Potential." Soil Systems 3, no. 2 (April 3, 2019): 26. http://dx.doi.org/10.3390/soilsystems3020026.

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Chars intended for use as soil amendment (“biochars”) vary greatly in their chemical and physical properties. In the present study, 19 Canadian temperate wood feedstocks were charred across a range of pyrolysis temperatures from 300–700 °C. The resulting 95 biochars were tested for their physio-chemical properties and liming capacity. Data indicated increasing base cation concentrations including Ca, Mg, and K (elements that characteristically form liming compounds, i.e., carbonates) as pyrolysis temperature increased. Acidic surface functional groups were analyzed with modified Boehm titration: Carboxylic and lactonic functional group concentrations decreased and phenolic group concentration increased with pyrolysis temperature. Functional group composition also varied greatly with feedstock: In particular, conifer-derived biochars produced at pyrolysis temperatures <500 °C showed much higher carboxylic and lactonic functional group concentrations than did angiosperm-derived biochars. Liming capacity was assessed using soil incubation experiments and was positively related to biochar pH. Both acidic surface functional group concentration and nutrient element concentration influenced biochar pH: we developed a non-linear functional relationship that predicts biochar pH from the ratio of carboxylic to phenolic moieties, and concentrations of Ca and K. Biochar’s liming components that are inherited from feedstock and predictably modified by pyrolysis temperature provide a basis for optimizing the production of biochar with desired pH and liming characteristics.
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Bu, Jiangping, Wenyu Li, Ning Niu, Ning Guo, Hao Zhou, Cheng Chen, and Aifang Ding. "Adsorption of Cr(VI) from wastewater by iron-modified coconut shell biochar." E3S Web of Conferences 248 (2021): 01059. http://dx.doi.org/10.1051/e3sconf/202124801059.

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This study is aimed to investigate the effect of raw and Fe-modified coconut shell biochar on the adsorption of Cr(VI) in the wastewater. Fe-modified biochar was obtained from the impregnation with FeNO3 solutions and the surface functional groups of two biochars were examined by infrared spectrometer.The result showed that the Fe-modified biochar had lower abundance of the surface functional groups than that of raw biochar, and had the group of Fe-O.The removal rate of Cr(VI) increased by 94.89% compared with the raw biochar because of existing of the group of Fe-O . The removal rate of Cr(VI) by modified biochar could reach more than 99.0% when the concentration of Cr(VI) was 12μg/ mL, pH 4.0, adsorbent dosage was 0.2g and adsorption time was 2h.
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Trinh, Bao-Son, Phung T. K. Le, David Werner, Nguyen H. Phuong, and Tran Le Luu. "Rice Husk Biochars Modified with Magnetized Iron Oxides and Nano Zero Valent Iron for Decolorization of Dyeing Wastewater." Processes 7, no. 10 (September 27, 2019): 660. http://dx.doi.org/10.3390/pr7100660.

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This study investigated if biochar, a low-cost carbon-rich material, can be modified with reactive materials for decolorization of dyeing wastewater. Two types of rice husk biochars were produced by using different processes of gasification and pyrolysis in limited air condition. The biochars were first magnetized and then modified with nano-scale zero-valent iron (nZVI) to achieve the final products of magnetic-nZVI biochars. Batch experiments were conducted to investigate the efficiency of the modified biochars for reducing color of the reactive dyes yellow (RY145), red (RR195), and blue (RB19) from dyeing solutions. Results showed that color removal efficiency of the modified biochars was significantly enhanced, achieving the values of 100% for RY145 and RR195 and ≥65% for RB19, while the effectiveness of the original biochar was significantly lower. In addition, with increasing dose of the modified biochars, the color removal efficiency increased accordingly. In contrast, when the dose of nZVI was increased beyond a certain value then its color removal efficiency decreased accordingly. It is reported that the magnetic-nZVI rice husk biochars effectively removed the reactive dyes. The impregnation of nZVI particles on the biochar surface spatially separates the nZVI particles, prevents its aggregation and therefore enhances the decolorization efficiency.
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Qin, Pinzhu, Dawei Huang, Rong Tang, Fangqun Gan, Ying Guan, and Xiaoxiao Lv. "Enhanced adsorption of sulfonamide antibiotics in water by modified biochar derived from bagasse." Open Chemistry 17, no. 1 (December 31, 2019): 1309–16. http://dx.doi.org/10.1515/chem-2019-0141.

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AbstractIn this study, biochars derived from bagasse were prepared and their ability for the adsorption of four kinds of sulfonamide antibiotics (sulfamethoxazol, thiazole, methylpyrimidine, dimethylpyrimidine) was investigated. Results showed that the modified biochar can efficiently adsorb sulfonamides in water. The biochar obtained at 500oC and modified with 30% hydrogen peroxide was chosen as the adsorbent. Under optimum conditions, pH 4 and 35°C, great adsorption performance was exhibited in the adsorption process of the four sulfonamide antibiotics. The productivity of the modified biochar was ~ 89% compared to un-modified biochar which is ~31%. The successful preparation of biochar from bagasse indicates that it is a good way to reuse the resources. Besides the adsorption of antibiotics, the obtained material also has a great prospect in the removal of other pollutants.
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Xu, Yonggang, Tianxia Bai, Yubo Yan, Yunfeng Zhao, Ling Yuan, Peng Pan, and Zhen Jiang. "Enhanced removal of hexavalent chromium by different acid-modified biochar derived from corn straw: behavior and mechanism." Water Science and Technology 81, no. 10 (May 15, 2020): 2270–80. http://dx.doi.org/10.2166/wst.2020.290.

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Abstract It is of great significance to remove Cr(VI) from water as a result of its high toxicity. Biochar from corn straw was modified by different acids (HNO3, H2SO4 and H3PO4) to remove Cr(VI) from aqueous solution. To estimate the removal mechanisms of Cr(VI) by the acid-modified biochars, batch experiments were performed in the light of contact time, Cr(VI) concentration, and pH, and the characteristics of acid-modified biochars before and after Cr(VI) adsorption were investigated by Fourier transform infrared spectra (FTIR) and X-ray photoelectron spectroscopy (XPS). The adsorption kinetics of Cr(VI) by acid-modified biochars were consistent with the pseudo-second-order model, and the adsorption isotherm obeyed the Freundlich model. Furthermore, the acid- modified biochars could supply more oxygen-containing functional groups (-COOH and -OH) as electron donor (e−) and hydrogen ion (H+) to enhance the reduction of Cr(VI) to Cr(III), resulting in enhanced removal of Cr(VI). HNO3-modified biochar exhibited the highest removal efficiency of Cr(VI). In general, the acid modifition of biochar was an effective method to increase the removal of Cr(VI).
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Li, Ruining, Zhaowei Wang, Jialei Guo, Yan Li, Hanyu Zhang, Junmin Zhu, and Xiaoyun Xie. "Enhanced adsorption of ciprofloxacin by KOH modified biochar derived from potato stems and leaves." Water Science and Technology 77, no. 4 (December 28, 2017): 1127–36. http://dx.doi.org/10.2166/wst.2017.636.

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Abstract Potato stems and leaves biochar (PB) was prepared by pyrolysis at a temperature of 500°C under anoxic conditions. In order to strengthen the adsorption capacity, biochar was modified with alkaline solution (alkali modified biochar, APB). Two kinds of biochars were adopted as adsorbents to remove ciprofloxacin (CIP) from aqueous solution. The adsorption behavior of CIP onto biochar before and after alkali modified including adsorption kinetics and isotherms were investigated. The effects of different factors (equilibrium time, pH, temperature and initial concentration) during the adsorption process were also investigated. Biochar samples were characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and nitrogen adsorption–desorption isotherm. The results showed that the alkali treated biochar possessed more mesopores than raw biochar, and accordingly exhibited a more excellent adsorption performance (23.36 mg·g−1) than raw biochar. Hydrophobic interaction, hydrogen-bonding interaction, electrostatic interaction, and π − π interaction were the adsorption mechanisms for CIP uptake onto the two adsorbents.
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Deng, Yu, Xiaodong Li, Fuquan Ni, Qiao Liu, Yunpeng Yang, Min Wang, Tianqi Ao, and Wenqing Chen. "Synthesis of Magnesium Modified Biochar for Removing Copper, Lead and Cadmium in Single and Binary Systems from Aqueous Solutions: Adsorption Mechanism." Water 13, no. 5 (February 25, 2021): 599. http://dx.doi.org/10.3390/w13050599.

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Biochar modification can enhance the properties associated with porosity and functional groups and has been identified as an effective way to improve adsorption capacity. Modified corncob biochars pretreated by different contents of MgCl2 are obtained through slow pyrolysis; then, this work explores the adsorption abilities towards heavy metals. After modification, biochars mainly impregnate carbon surface with Mg(OH)2 and MgO particles. The best mass ratio of magnesium (Mg)/feedback is 15% for modified biochar, and 15%Mg-BC has much higher (2.36–9.34 times) metal sorption capacity than pristine biochar. Batch adsorption experiments show that copper (Cu(II)) and lead (Pb(II)) on adsorbents follow a pseudo-second-order model and cadmium (Cd(II)) follows an intraparticle diffusion model. The adsorption isotherm of Cu(II) fits well with the Langmuir model, and Pb(II) and Cd(II) fit with the Freundlich model. In the binary system, modified biochar still effectively removes metals, but the sorption capacity of metals decreases rapidly because of competitive sorption. The main adsorption mechanisms of metals include surface precipitation, cation π-banding, complexation, and ion exchange. The results show that Mg-modified biochar may be an environmentally friendly material for reducing the water pollution of heavy metals.
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Zhan, Linjie, and Minxian Chen. "The Improvement Effects of Different Treatment Methods of Soil Wastewater Washing on Environmental Pollution." Water 12, no. 9 (August 19, 2020): 2329. http://dx.doi.org/10.3390/w12092329.

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This paper focus on how to treat the wastewater after soil washing since water pollution is a severe threat to the water security of China. Ca (OH)2 and two kinds of biochars (biochar and ZnCl2 modified biochar) were tested to treat the waste FeCl3 washing effluent. Two kinds of biochars (biochar and ZnCl2-modified biochar) were prepared from maize straws. Soil samples were collected near a smelter for adsorption experiments. ICP-OES was used to determine the concentration of metal ions in the samples, as well as calculating their adsorption capacity and removal rate. As to Ca(OH)2 treatment, the maximum removal rates of Cd, Pb, Cu, and Zn could exceed 99%, and the concentrations of Cd, Pb, Cu, and Zn in solution could reduce to 0.08, 0.018, 0.15, 0.44 mg/dm3, respectively. However, both of the two biochars had relatively low removal rates compared with Ca (OH)2 treatment. The wastewater shows significantly lower environmental implications after the two treatments, and the lime precipitation method has better effects than biochar adsorption. The activated carbon adsorption method discussed can significantly improve the environmental pollution caused by soil washing wastewater, which is suitable for environmental treatment projects.
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Peng, Zhongya, Xiaomei Liu, Hongkun Chen, Qinglong Liu, and Jingchun Tang. "Characterization of ultraviolet-modified biochar from different feedstocks for enhanced removal of hexavalent chromium from water." Water Science and Technology 79, no. 9 (May 1, 2019): 1705–16. http://dx.doi.org/10.2166/wst.2019.170.

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Abstract Biochars produced from different feedstocks via pyrolytic carbonization and ultraviolet (UV) modification were used as alternative adsorbents for aqueous hexavalent chromium (Cr(VI)) remediation. Structural and morphological analysis showed that UV irradiation increased the surface area of biochar and added a large amount of oxygen-containing functional groups on the biochar's surface, resulting in about 2–5 times increase of Cr(VI) removing capacity (14.39–20.04 mg/g) compared to that of unmodified biochars (3.60–8.43 mg/g). The sorption ability among different feedstocks after modification was as follows: corn stack &gt; sawdust &gt; wheat straw. The adsorption kinetics and adsorption isotherm data agreed well with the pseudo-second-order model and Freundlich model, respectively. Experimental and modeling results suggested that the oxygen-containing functional groups and surface areas of biochars were notably increased after UV irradiation, which was mainly governed by surface complexation. X-ray photoelectron spectroscopy analysis showed that reduction occurred during Cr(VI) adsorption. In addition, UV irradiation significantly increased the concentration of dissolved organic matter (DOM) in biochars. The collected outcomes showed that UV-modified biochar was a good material for the removal of hexavalent chromium from aqueous medium. The excellent adsorption capacity, environmental-friendly and low cost properties made the novel material an auspicious candidate for environmental remediation.
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Petruccelli, Raffaella, Alessandra Bonetti, Maria Laura Traversi, Cecilia Faraloni, Massimo Valagussa, and Alessandro Pozzi. "Influence of biochar application on nutritional quality of tomato (Lycopersicon esculentum)." Crop and Pasture Science 66, no. 7 (2015): 747. http://dx.doi.org/10.1071/cp14247.

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The potential of biochar to improve crop productivity has received interest in recent years; however, little is known about the effects of biochar on crop nutritional quality. In this study, effects of three different biochars (wheat straw biochar, poplar biochar and olive residues biochar) were determined on the major fruit-size parameters, physico-chemical and nutritional properties of tomato (Lycopersicon esculentum L.) cv. Rio Grande. Application of biochar alone was sufficient to sustain the fruit growth, but results were affected by feedstock source of biochar. There were no significant differences in size and weight parameters and the sugar content was not significantly modified by biochar amendment. On the other hand, secondary metabolites showed changes relating to biochar type. Total phenol and flavonoid contents, as well as antioxidant activity, were higher in fruits grown in substrate amended with straw biochar and olive residues biochar. Lycopene, β carotene and lutein concentrations from tomato fruits grown on substrates amended with different biochars were significantly lower than from the control. The data require confirmation in field experiments; however, this study offers new knowledge about the biochar effects on horticultural crops.
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Dissertations / Theses on the topic "Modified biochar"

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Stenström, Ylva. "Phosphorus and Nitrogen Removalin Modified Biochar Filters." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-321915.

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Onsite wastewater treatment systems in Sweden are getting old and many of them lack sufficient phosphorus, nitrogen and organic carbon reduction. Biochar is a material that has been suggested as an alternative to the common sand or soil used in onsite wastewater treatment systems. The objective of this study was to compare the phosphorus removal capacity between three different modified biochars and one untreated biochar in a batch adsorption and column filter experiment. The modifications included impregnation of ferric chloride (FeCl3), calcium oxide (CaO) and untreated biochar mixed with the commercial phosphorus removal product Polonite. To further study nitrogen removal a filter with one vertical unsaturated section followed by one saturated horizontal flow section was installed. The batch adsorption experiment showed that CaO impregnated biochar had the highest phosphorus adsorption, i.e. of 0.30 ± 0.03 mg/g in a 3.3 mg/L phosphorus solution. However, the maximum adsorption capacity was calculated to be higher for the FeCl3 impregnated biochar (3.21 ± 0.01 mg/g) than the other biochar types. The pseudo 2nd order kinetic model proved better fit than the pseudo 1st order model for all biochars which suggest that chemical adsorption was important. Phosphorus adsorption to the untreated and FeCl3 impregnated biochar fitted the Langmuir adsorption isotherm model best. This indicates that the adsorption can be modeled as a homogenous monolayer process. The CaO impregnated and Polonite mixed biochars fitted the Freundlich adsorption model best which is an indicative of heterogenic adsorption. CaO and FeCl3 impregnated biochars had the highest total phosphorus (Tot-P) reduction of 90 ± 8 % and 92 ± 4 % respectively. The Polonite mixed biochar had a Tot-P reduction of 65 ± 14 % and the untreated biochar had a reduction of 43 ± 24 %. However, the effluent of the CaO impregnated biochar filter acquired a red-brown tint and a precipitation that might be an indication of incomplete impregnation of the biochar. The FeCl3 effluent had a very low pH. This can be a problem if the material is to be used in full-scale treatment system together with biological treatment for nitrogen that require a higher pH. The nitrogen removal filter showed a total nitrogen removal of 62 ± 16 % which is high compared to conventional onsite wastewater treatment systems. Batch adsorption and filter experiment confirms impregnated biochar as a promising replacement or addition to onsite wastewater treatment systems for phosphorus removal. However the removal of organic carbon (as chemical oxygen demand COD) in the filters was lower than expected and further investigation of organic carbon removal needs to be studied to see if these four biochars are suitable in real onsite wastewater treatment systems.
Många av Sveriges små avloppssystem är gamla och saknar tillräcklig rening av fosfor, kväve och organiskt material. Följden är förorenat grundvatten samt övergödning i hav, sjöar och vattendrag. Lösningar för att förbättra fosfor- och kvävereningen finns på marknaden men många har visat brister i rening och robusthet. Biokol är ett material som har föreslagits som ersättare till jord eller sand i mark och infiltrationsbäddar. Denna studie syftade till att i skak- och kolonnfilterexperiment jämföra fosforreduktion mellan tre modifierade biokol och ett obehandlat biokol. Modifieringen av biokolet innebar impregnering med järnklorid (FeCl3), kalciumoxid (CaO) samt blandning med Polonite som är en kommersiell produkt för fosforrening. För att undersöka förbättring av kväverening installerades även ett filter med obehandlat biokol där en vertikal aerob modul kombinerades med en efterföljande horisontell anaerob modul. Skakstudien där biokolen skakades i 3.3 mg/L fosforlösning visade att adsorptionen var högst i det CaO-impregnerade biokolet, 0.3 ± 0.03 mg/g. Den maximala potentiella fosforadsorptionen beräknades dock vara högst för biokolet som impregnerats med FeCl3, 3.21 ± 0.01 mg/g. Skakförsöket visade också att fosforadsorptionen var främst kemisk då adsorptionen passade bättre med pseudo andra ordningens modell än pseudo första. Adsorption av fosfor på obehandlat biokol och FeCl3 impregnerat biokol modellerades bäst med Langmuir modellen, vilket tyder på en homogen adsorption. Det Polonite-blandade biokolet och CaO-impregnerade biokolet modellerades bäst med Freundlich modellen vilket är en indikation på en heterogen adsorptionsprocess. Biokol impregnerat med CaO och FeCl3 gav de högsta totalfosforreduktionerna på 90 ± 8 % respektive 92 ± 4 %. Biokolet som var blandat med Polonite hade en reduktion på 65 ± 14 % och det obehandlade biokolet 43 ± 24 %. Ett problem med filtratet från CaO-filtret var att det fick en rödbrun färg samt en fällning vilket kan ha berott på ofullständig pyrolysering och impregnering. Filtratet från det FeCl3 impregnerade biokolet hade mycket lågt pH vilket kan vara problematiskt om mikrobiologisk tillväxt i filtret för rening av kväve och organiskt material vill uppnås. Filtret för kväverening gav en total kvävereduktion på 62 ± 16 % vilket är högre än kommersiella system. Resultaten från skak och filterstudien visade på att impregnerade biokol kan ge en förbättrad fosforrening om de skulle användas i små avloppssystem. Rening av organiskt material, kemisk syreförbrukning (COD), var dock låg i alla filter och behöver studeras ytterligare för att avgöra om dessa biokol är lämpliga för småskalig avloppsvattenrening.
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Dobbs, Jonathan. "The Potential Use of PEI Modified Biochar for Different Environmental Applications." Thesis, Mississippi State University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10616945.

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Man-made pollution is hazardous to both the environment and human health. This study attempts to develop a low-cost, biobased adsorbent for CO2 capture and heavy metal removal. The adsorption behavior of CO2 from air and Pb (II) from aqueous systems onto polyethylenimine (PEI) modified biochar was studied. Chemical and physical pretreatments were performed in an attempt to enhance the adsorption kinetics of biochar. FT-IR and Elemental Analysis were performed to confirm the loading of PEI onto the surface of biochar was achieved. The efficiency of the PEI modified biochar on the removal of Pb (II) from aqueous solutions was determined by Atomic Absorption Spectrometer (AAS). Alkali pretreatment of PEI modified biochar increased CO2 capture and removal of Pb(II). This experiment introduces a new approach to air and water purification by using the combination of an amine with biochar.

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Haddad, Khouloud. "Etude de la pyrolyse de matériaux biosourcés chimiquement modifiés : Caractérisation des biochars et application agronomique." Thesis, Mulhouse, 2018. http://www.theses.fr/2018MULH2159.

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La Tunisie dispose d'une multitude de biomasses sèches telles que la sciure de bois de cyprès (SBC) et humides telles que les margines générées par l'industrie oléicole. Ce travail vise en premier lieu à étudier la conversion thermochimique par pyrolyse lente du mélange de SBC/solutions chargées en métaux alcalins (K et Na) et alcalino-terreux (Mg et Ca) et de SBC/margines et par la suite à explorer la valorisation agronomique des biochars produits. Les analyses thermogravimétriques (ATG/TG) ont montré que l'imprégnation de la SBC avec les quatres minéraux (K, Na, Mg, Ca) induit des modifications significatives sur le processus de pyrolyse. En particulier, la dégradation de la cellulose est fortement influencée par la présence du potassium. De même, la température de pyrolyse ainsi que l'imprégnation avec les minéraux et les margines affectent d'une manière significative le rendement des biochars produits et leurs structures carbonés. Quant à la valorisation agronomique des biochars produits, nous avons démontré que les biochars issus de la sciure de bois imprégnée par les margines peut être utilisé comme un amendement efficace pour la fertilisation potassique de sols agricoles. En effet, une amélioration de la croissance du Ray Grass, en termes de matières fraîches, de l'ordre de 36 0/0 a été enregistrée. De plus, un taux relativement élevé d'exportation de K par la plante testée (37 g. Kg-1) a été estimé
Tunisia produces multitude of dry and wet biomass such as cypress sawdust (CS) and olive mill wastewaters (OMWW), respectively. The main aims of this research work are: i)to study the thermal conversion through slow pyrolysis of the CS impregnated With OMWW and various synthetic mineral solutions (K, Na, Mg and Ca), and ii) to explore the valorisation of the produced biochars as amendments for agricultural soils. The thermogravimetric analyzes (DTG/TG) showed that the impregnation of the CS with the four minerals (K, Na, Mg, Ca) and OMWW induced significant changes in the pyrolysis process. The highest impact was observed for the cellulose degradation in the presence of potassium. Moreover, the pyrolysis temperature as well as the nature of the impregnated mineral on the CS surface affect significantly the yield of the produced biochars and their structures. Regarding the valorisation of the produced biochars, experimental results showed that the biochars generated from the pyrolysis of CS impregnated with OMWW could be used as an efficient fertilizer for agricultural soils. Indeed, it improves by about 36 0/0 the growth of Rye Grass. Furthermore, a relatively high potassium rate was exported to Rye Grass ( (37g Kg-1 ) was registered
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Chan, Meng-Hsuan, and 詹孟軒. "Study on the Adsorption/Desorption of Solar Kerf-Loss Slurry with Biochar Modified by Magnetic Nanoparticles." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/d39347.

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碩士
國立雲林科技大學
環境與安全衛生工程系
107
In recent years, With the exhaustion of resources and the rise of green energy awareness, the solar energy industry has gradually become a key industry promoted by many national green energy policies. Although the solar cell is almost zero pollution during use, it is inevitable that waste and sewage will be produced during the manufacturing process and after the decommissioning. The treatment object of this study─solar kerf-loss slurry is the wastewater generated by the process of slicing the ingot in the process. Because silicon (Si) in the cutting fluid wastewater is difficult to separate, the quality of the regenerated cutting fluid is too low to be reused; and it is highly polluting and cannot be discharged to the river. The methods proposed today include froth flotation, centrifugation, density separation, applied electric field, adsorption, hydrocyclone, acid treatment, electrolysis or pickling, chemical reaction, etc. The principle of most of the methods applied is phase transfer, but most of the methods only apply for patents. From the field application, there is still a long way to go. biochar(BC) has large specific surface area, stable structure and strong adsorption capacity. However, it also has limitations in use, and it takes a long time to settle by standing, and if it is filtered, it will cause additional consumption of the filter membrane. Therefore, in this study, biochar was modified by magnetic nanoparticles (MNPs) to increase the efficiency of various treatments by applying an external magnetic field. The research results show that the adsorption capacity of biochar on strontium is about 37 – 52 mg/g; while the modified biochar adsorbs about 93 – 124 mg/g on strontium, and it can be effectively attracted by external magnetic field, accelerating its Separation efficiency reduced from 3 days to 3 hours. Modified biochar can handle the higher viscosity cutting fluid wastewater, and the kinematic viscosity is increased by about 1.52 times. The most effective pH value for treating cutting fluid wastewater is 4 before and after the upgrading. The biochar modified by nano magnetic particles can be recycled. The research results show that silicon can effectively desorb and collect in the pH9 environment. In the results of this experiment, it is known that about 5 recycling and recycling procedures can be carried out, but it is recommended to recycle 4 times to avoid secondary pollution during wastewater treatment.
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Shao-YiLo and 羅韶儀. "Thiourea modified magnetic biochar from spent coffee grounds by microwave-assisted activation for recycling platinum group metals." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/778494.

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碩士
國立成功大學
環境工程學系
107
Since the industrial revolution, people have been mining metals to produce industrial products, and the amounts of metal have been extensively used over time. Among them, platinum group metals have been widely used in solar panels, catalysts, or pharmaceuticals in recent years because of their high melting point, stable electrothermal stability, excellent corrosion resistance, and superior catalytic activity. However, excessive mining has caused a rapid decline in the contents of platinum group metals, so the precious metals distributed in urban industrial products are recycled and reused through the concept of urban mining. In the past, in the process of collecting platinum group metals, most of them were recovered by toxic cyanide or aqua regia, or precious metals were collected by ion exchange membrane or ionic liquid. However, during the collection process, the toxic substances would be discharged to the environment. In recent years, the biochars with special physicochemical properties, which can be applied to adsorb precious metals in polluted water bodies and land rejuvenation. In this study, magnetic biochar composites were prepared from waste coffee grounds, and physical activation was carried out using different temperatures and CO2 flow rate, and KOH was used as a chemical activator under microwave activation. The nitrogen is then modified on the biochars by microwave heating under ammonia flow, and the thiourea functional group is modified to assist in the extraction of the target platinum group metals. The characteristics were analyzed by specific surface area analyzer (BET), scanning electron microscope (SEM) and so no, and the performance of the biochar adsorbents was investigated by kinetics, isothermal adsorption experiments, and thermodynamics. At the same time, commercial activated carbon is used to adsorb automotive catalyst digestion liquids to compare the selectivity of the platinum group metals. The results show that with the CO2 flow rate of 500 cm3/min and the carbonization temperature of 700 °C, the optimal specific surface area is 320.9 m2/g, and microwave-assisted N-doping for ten min has higher nitrogen contents in the biochars, followed by incorporating with thiourea to prepare magnetic composites. As a result, the adsorption efficiency of platinum and palladium adsorption of 98.8% and 74.9% can be obtained under the condition (0.25 g of dose, 25 °C and pH = 2) within 360 min. Besides, the kinetics, adsorption isotherms and thermodynamic experiments of adsorbents are investigated. The adsorption stability of magnetic biochars can be maintained after 6 runs of cyclic tests.
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Hsieh, Hsin-Hsien, and 謝信賢. "Synthesis of modified anchoring molecules for biochip substrate." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/02316128159689827403.

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碩士
淡江大學
化學學系碩士班
103
Our laboratory has developed and reported a series of thiophene-based compounds which were synthesized and employed as biolinkers of biochip. Due to π-electron conjugation property of mutiple thiophene rings, bis-thiophene-based compounds display planar structure and conjugation which possess some great electron conductivity. The introduction of thiol functionality on thiophene can provide the covalent bond on gold metal surface to generate Self-Assembled Monolayer (SAM) by a spontaneously chemical reaction. This SAM can improve the detection sensitivity when it was introduced on the biochip application. Therefore, we synthesized two kinds of mercapto-bis-thiophene-based molecules, and also modified carboxylic acid group on another terminal site of thiophene ring. These new organic compounds may be able to apply on the biochip research and act as the linkers between substrate and detecting probe .
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Book chapters on the topic "Modified biochar"

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Chiu, Abraham C. F., and Y. Xiao. "Physical Modelling of Mitigating Methane Emission from Biochar Modified MSW Landfill Cover." In Proceedings of the 8th International Congress on Environmental Geotechnics Volume 3, 429–34. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2227-3_53.

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Conference papers on the topic "Modified biochar"

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Chemerys, Valeriia, and Edita Baltrėnaitė. "MODIFIED BIOCHAR: A REVIEW ON MODIFICATIONS OF BIOCHAR TOWARDS ITS ENHANCED ADSORPTIVE PROPERTIES." In Conference for Junior Researchers „Science – Future of Lithuania“. VGTU Technika, 2016. http://dx.doi.org/10.3846/aainz.2016.03.

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Rich in aromatic carbon and minerals, biochar is produced by biomass pyrolysis at temperatures ranging from 350 °C to 1000 °Cin low-oxygen environment. Traditionally biochar was applied to soilto improve its fertility and carbon sequestration. However, due to low production costs, availability of the feedstock and specific biochar properties related to adsorption of contaminants from aqueous solutions, biochar has gained much interest in other fields, e.g. health sciences and engineering. The aim of the study was to distinguish the types of biochar modifications and to determine biochar characteristics contributing to adsorption. This paper is focused on recentexperimental studies related tobiochar modifications enhancing the adsorption of contaminants. Mechanisms of adsorption and the key factors affecting adsorptive properties of biochar are analyzed. Finally, recommendations for further research in designing the biochar are proposed.
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Ma, Yan-Ru, Li-Ming Wang, Wen-Yang Sun, Kang Feng, and Yang Lv. "Experimental study on biochar modified characteristics." In 2nd Annual International Conference on Energy, Environmental & Sustainable Ecosystem Development (EESED 2016). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/eesed-16.2017.58.

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Zhao, Huaxuan, Huaxuan Zhao, Zhengmei Cao, Zhengmei Cao, Jin Li, Jin Li, Yinhai Lang, and Yinhai Lang. "Adsorptive Removal of Ciprofloxacin by Ferric Chloride Modified Biochar." In International Workshop on Environment and Geoscience. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0007425700560061.

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Kumi, Andy G., Mona G. Ibrahim, Mahmoud Nasr, and Manabu Fujii. "Synthesis, characterization and adsorption properties of sewage sludge derived biochar modified with eggshell." In 2020 Advances in Science and Engineering Technology International Conferences (ASET). IEEE, 2020. http://dx.doi.org/10.1109/aset48392.2020.9118226.

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Yuan, Zhihui, Minchao Liu, and Zhiliang Chen. "Dairy manure biochar modified with sodium hydroxide and its effect on lead removal in aqueous solution." In 2015 4th International Conference on Sensors, Measurement and Intelligent Materials. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icsmim-15.2016.208.

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Anas, Argo Khoirul, Aqidatul Izzah, Sandy Yudha Pratama, and Febi Indah Fajarwati. "Removal of methylene blue using biochar from cassava peel (Manihot utilissima) modified by sodium dodecyl sulphate (SDS) surfactant." In PROCEEDINGS OF THE 3RD INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2019): Exploring New Innovation in Metallurgy and Materials. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0002675.

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Tauqeer, Hafiz Muhammad, Muhammad Iqbal, and Ali Khan Shahbaz. "The Potential Appliactions of Biochar and Modified Kaolinite Composites for Chromium Immobilization and its Uptake by Spinacia Oleracea L. From Chromium Contaminated Soil." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2570.

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Chemerys, Valeriia, and Edita Baltrėnaitė. "Effect of Modification with FeCl3 and MgCl2 on Adsorption Characteristics of Woody Biochar." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.012.

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Due to high specific surface area, well-developed porous structure and surface functionality biochar has a potential for being used as low-cost adsorbent for adsorption of organic and inorganic contaminants from aqueous so-lutions. Higher adsorption capacity and selectivity for metals could be further developed after modification of proper-ties of biochar through physical (“designed biochar”) and chemical (“engineered biochar”) modification techniques. Wood waste of three types [aspen (Populus tremula L.), pine (Pinus sylvestris L.) and fir (Picea abies L.)] were se-lected to produce the biochar under slow pyrolysis conditions at 450 °C for 2 h with the heating rate of 10 °C/min. Mg and Fe-particles, acting as potential sorption sites for adsorption of metals, were added into the biochar through modi-fication of the biochar with metal salts MgCl2 and FeCl3. The aim of the study was to investigate the effect of chemi-cal modifications of woody biochar with MgCl2 and FeCl3 on the adsorption characteristics of the biochar. The engi-neered biochar with improved physico-chemical and sorptive properties was evaluated as potential adsorbent of metals from aqueous solutions. Such characteristics of the biochar, as density, porosity, pH, cation exchange capacity, elec-trical conductivity, moisture content, ash content, water holding capacity, total organic carbon were analyzed. Modifi-cations followed by increasing of moisture and ash content. While carrying out the future adsorption experiment, sig-nificantly decreased pH and electrical conductivity of the engineered biochar should be taken into account. Increased cation exchange capacity of the engineered biochar promotes enhanced adsorption of metals.
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Jou, Wei-Jung, Pei-Wen Huang, Yu-Min Lin, Sung-Chun Tang, Dar-Ming Lai, and An-Yeu Wu. "A stroke severity monitoring system based on quantitative modified multiscale entropy." In 2014 IEEE Biomedical Circuits and Systems Conference (BioCAS). IEEE, 2014. http://dx.doi.org/10.1109/biocas.2014.6981640.

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Lee, Hsieh-Wei, Sheau-Fang Lei, King-Chu Hung, and Bin-Da Liu. "Breast Lesions Classification Using Modified Non-Recursive Discrete Biorthogonal Wavelet Transform." In 2007 IEEE Biomedical Circuits and Systems Conference. IEEE, 2007. http://dx.doi.org/10.1109/biocas.2007.4463349.

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