Elemental mercury removal using biochar pyrolyzed from municipal solid waste

Li, Guoliang; Shen, Bo; Li, Fukuan; Tian, Liyan; Singh, Surjit; Wang, Fumei

doi:10.1016/j.fuproc.2014.12.042

Cited by 94 publications

(36 citation statements)

References 33 publications

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“…Removal of mercury increased with an increase in G content from 0.1 to 1.0% in a WS-G-BC composite [79]. The removal of Hg was facilitated by the large surface area, allowing surface complexation between Hg and the increased oxygen-containing functional groups (-OH, O=C-O) and C=C groups on the surface of the composite containing 1% G [96]. and Cd(II) than the CNT-BC composite.…”

Section: Trace Metalsmentioning

confidence: 95%

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Biochar-based engineered composites for sorptive decontamination of water: A review

Premarathna

Rajapaksha

Sarkar

et al. 2019

Chemical Engineering Journal

327

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Biochar (BC) exhibits a great potential as an adsorbent in decontamination of water. To improve the adsorption capabilities and impart the particular functionalities of BC, various methods (chemical modification, physical modification, impregnation with different materials, and magnetic modification) have been developed. As compared to surface modifications, BCbased composites provide various technical and environmental benefits because they require fewer chemicals, lesser energy, and confer enhanced removal capacity. Therefore, this review focuses on BC composites prepared by the combination of BC with different additives including metals, metal oxides, clay minerals, and carbonaceous materials, which greatly alter the physicochemical properties of BC and broaden its adsorption potential for a wide range of aquatic contaminants. Techniques for the preparation of BC composites, their adsorption potentials for a variety of inorganic and organic environmental contaminants, factors affecting BC properties and the adsorption process, and the mechanisms involved in adsorption are also discussed. Modification typically alters the surface properties and functionalities of BC composites including surface area, pore volume, pore size, surface charge, and surface functional groups. Hence, modification typically enhances the adsorption capacity of BC for most organic and inorganic compounds. Nevertheless, some modifications negatively affect the adsorption of certain contaminants because of various factors including obstruction of pores due to over coating and development of same charge as contaminant on surface of BC.However, the use of BC composites in environmental remediation is still in its infancy, and further research and development is needed to reach scalability and commercialization of the new technology.

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Section: Trace Metalsmentioning

confidence: 95%

“…Mostly, adsorption of trace metals occurs via surface complexation mechanism, i.e., via diffuse double layers. Mercury adsorption occurs via surface complexation between mercury and the oxygen-containing functional groups (-OH, O=C-O) and alkene (C=C) groups on the surface of a BC composite containing 1% Graphene [96].…”

Section: Mechanisms Involvedmentioning

confidence: 99%

Biochar-based engineered composites for sorptive decontamination of water: A review

Premarathna

Rajapaksha

Sarkar

et al. 2019

Chemical Engineering Journal

327

View full text Add to dashboard Cite

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“…Hg(OH) 2 (aq) was the predominant Hg(II) species at experimental pH values (6.8-7.0) based on the Visual MINTEQ (version 3.0) results (data not shown). In addition to the contribution of larger surface area (more adsorption of Hg(OH) 2 on the surface of G/BC-1%), surface complexation between mercury and increased -OH, O@C-O oxygen-containing groups and C@C groups on the surface of G/BC-1% promoted the removal of mercury (Dong et al, 2013;Li et al, 2015). Taken together both phenanthrene and mercury sorption capacity, the optimum amount of G was determined to be 1%, which was used in the subsequent tests.…”

Section: Effects Of G Concentration On Phenanthrene and Mercury Sorptmentioning

confidence: 99%

Preparation and characterization of a novel graphene/biochar composite for aqueous phenanthrene and mercury removal

Tang

Gong

et al. 2015

Bioresource Technology

277

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“…Furthermore, the microwave and steam activation further improved the pore property. The ash removal by microwave action increased the pore volume and specific surface area of bio-chars [20,21]. On the contrary, the loading of ammonium halides inhabited pore property of bio-chars.…”

Section: Pore Analysismentioning

confidence: 98%

Mechanism identification of temperature influence on mercury adsorption capacity of different halides modified bio-chars

Ding

Shen

2017

Chemical Engineering Journal

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Bio-chars as mercury sorbent were derived from cotton straw via pyrolysis carbonization, microwave/steam activation and ammonium halides impregnation. Mercury adsorption capacity of various impregnated bio-chars was tested at different temperatures. Rising temperature improved the adsorption capacity of bio-chars modified with NH 4 Br and NH 4 I yet inhabited that of bio-char modified with NH 4 Cl. Kinetic model analysis indicated that the changes of mercury adsorption capacity were related to the difference of enthalpy change for various bio-chars. In temperature programmed desorption technic (TPDT) analysis, high desorption energy (80.9-82.1 kJ•mol-1) proved that mercury adsorption mainly depended on chemisorption for halide modified bio-chars. Modification effect of ammonium halides on mercury adsorption capacity followed the order: NH 4 I (7643.1 µg•g-1) > NH 4 Br (842.0 µg•g-1) > NH 4 Cl (365.3 µg•g-1). X-ray photoelectron spectroscopy (XPS) analysis proved that C-X groups served as mercury adsorption sites and determined the mercury removal capacity of bio-chars. This study explained the mechanism of temperature effects and halides modification as well as proposed useful suggestion on mercury sorbent preparation and application.

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Elemental mercury removal using biochar pyrolyzed from municipal solid waste

Cited by 94 publications

References 33 publications

Biochar-based engineered composites for sorptive decontamination of water: A review

Biochar-based engineered composites for sorptive decontamination of water: A review

Preparation and characterization of a novel graphene/biochar composite for aqueous phenanthrene and mercury removal

Mechanism identification of temperature influence on mercury adsorption capacity of different halides modified bio-chars

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