Biochar-supported zerovalent iron for removal of various contaminants from aqueous solutions.
Biochar-supported zerovalent iron for removal of various contaminants from aqueous solutions.
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DOI：
10.1016/j.biortech.2013.11.021
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发表时间：
2014
影响因子：
11.4
通讯作者：
Yanmei Zhou;B. Gao;A. Zimmerman;Hao Chen;Ming Zhang;Xinde Cao
中科院分区：
文献类型：
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作者：
Yanmei Zhou;B. Gao;A. Zimmerman;Hao Chen;Ming Zhang;Xinde Cao
这项工作描述了一种新的环境吸附剂，结合生物炭，壳聚糖和零价铁（ZVI）的优点的合成和测试。以壳聚糖为分散剂和焊接剂，将细小的ZVI颗粒附着在竹生物炭表面。结果ZVI-生物炭复合材料（BBCF）的表征表明，壳聚糖有效地焊接到生物炭孔网络内的碳质表面的铁颗粒。BBCF对重金属（Pb（II）、Cr（VI）、As（V））、磷酸盐（P）和亚甲基蓝（MB）的吸附能力增强。生物炭负载ZVI对Pb（II）、Cr（VI）和MB的去除主要受还原和表面吸附两种机制控制。阴离子污染物（As（V）和P）的去除可能是通过BBCF表面铁颗粒的静电吸引来控制的。另一个好处是负载污染物的BBCF可以通过磁吸引容易地从水溶液中除去。
This work describes the synthesis and testing of a novel environmental sorbent that combines the advantages of biochar, chitosan, and zerovalent iron (ZVI). Chitosan was used as a dispersing and soldering reagent to attach fine ZVI particles onto bamboo biochar surfaces. Characterization of the resulted ZVI-biochar composites (BBCF) indicated that chitosan effectively soldered the iron particles onto carbonaceous surfaces within the biochar pore networks. The BBCF showed enhanced ability to sorb heavy metals (Pb(II), Cr(VI), and As(V)), phosphate (P), and methylene blue (MB) from aqueous solutions. The removal of Pb(II), Cr(VI), and MB by the biochar-supported ZVI was mainly controlled by both the reduction and surface adsorption mechanisms. Removal of anionic contaminants (As(V) and P) was likely controlled by electrostatic attraction with the iron particles on the BBCF surfaces. An additional benefit is that the contaminant-laden BBCF could be removed from aqueous solution easily by magnetic attraction.