Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, United States.
Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, United States.
Bioresour Technol. 2014;152:538-42. doi: 10.1016/j.biortech.2013.11.021. Epub 2013 Nov 19.
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.
这项工作描述了一种新型环境吸附剂的合成与测试，该吸附剂结合了生物炭、壳聚糖和零价铁（ZVI）的优点。壳聚糖被用作分散和焊接试剂，将细小的 ZVI 颗粒附着在竹生物炭表面上。对所得 ZVI-生物炭复合材料（BBCF）的表征表明，壳聚糖有效地将铁颗粒焊接在生物炭孔网络内的碳质表面上。BBCF 显示出增强的从水溶液中吸附重金属（Pb（II）、Cr（VI）和 As（V））、磷酸盐（P）和亚甲基蓝（MB）的能力。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机制的控制。阴离子污染物（As（V）和 P）的去除可能受 BBCF 表面铁颗粒的静电吸引控制。另一个好处是，负载污染物的 BBCF 可以通过磁吸引很容易地从水溶液中去除。
