Adsorption of cadmium and lead ions by phosphoric acid-modified biochar generated from chicken feather: Selective adsorption and influence of dissolved organic matter
Adsorption of cadmium and lead ions by phosphoric acid-modified biochar generated from chicken feather: Selective adsorption and influence of dissolved organic matter
复制标题
鸡毛生成的磷酸改性生物炭对镉和铅离子的吸附：选择性吸附和溶解有机物的影响
DOI：
10.1016/j.biortech.2019.121948
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发表时间：
2019-11-01
影响因子：
11.4
通讯作者：
Zhang, Yulong
中科院分区：
文献类型：
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作者：
Chen, Huayi;Li, Wenyan;Zhang, Yulong
为了提高吸附效率，利用鸡毛制备了H3PO4改性生物炭（CFCP），并将其应用于Cd2+和Pb2+的吸附。准二阶模型可以解释Cd2+和Pb2+的吸附行为。 CFCP 比未改性生物炭 (CFC2) 具有更快的吸附速率。 Langmuir 和 Freundlich 等温线分别可以更好地描述 Cd2+ 和 Pb2+ 的吸附。 CFCP吸附Cd2+的q(m)值和吸附Pb2+的K-F值分别为7.84 mg.g(-1)和24.41 mg(-1-(1/n)).L-1/n.g(-1),分别是CFC2相应结果的1.38和5.41倍。相对于Cd2+，Pb2+在二元金属体系中被生物炭选择性吸附。磷酸盐沉淀部分解释了 Pb2+ 的选择性吸附。脯氨酸、葡萄糖和pH（4-6）对Cd2+和Pb2+吸附影响不大。静电相互作用、沉淀和O-H键是主要的吸附机制。 CFCP 含氮杂环的增加导致了 Cd2+ 和 Pb2+ 吸附的增加。
To improve the adsorption efficiency, a H3PO4-modified biochar (CFCP) was prepared using chicken feather and applied to Cd2+ and Pb2+ adsorption. The pseudo-second-order model could explain the Cd2+ and Pb2+ adsorption behavior. CFCP had faster adsorption rate than non-modified biochar (CFC2). The Langmuir and Freundlich isotherm could better describe the Cd2+ and Pb2+ adsorption, respectively. The value of q(m) for Cd2+ adsorption and K-F for Pb2+ adsorption by CFCP was 7.84 mg.g(-1) and 24.41 mg(-1-(1/n)).L-1/n.g(-1), which was 1.38 and 5.41 times of the corresponding results of CFC2. Relative to Cd2+, Pb2+ was selectively adsorbed by biochars in the binary metal system. Phosphate precipitation explained in part the selective adsorption of Pb2+ . Proline, glucose, and pH (4-6) had little influence on Cd2+ and Pb2+ adsorption. Electrostatic interaction, precipitation, and O-H bonds were the primary adsorption mechanisms. The increased N-containing heterocycles of CFCP accounted for the increased Cd2+ and Pb2+ adsorption.