Highly-effective removal of Pb by co-pyrolysis biochar derived from rape straw and orthophosphate

生物炭 热解 吸附 化学 稻草 核化学 环境化学 木炭 焦磷酸盐 吸附 无机化学 有机化学
作者
Ruili Gao,Qingling Fu,Hongqing Hu,Qian Wang,Yonghong Liu,Jun Zhu
出处
期刊:Journal of Hazardous Materials [Elsevier BV]
卷期号:371: 191-197 被引量:122
标识
DOI:10.1016/j.jhazmat.2019.02.079
摘要

When used separately, biochar and orthophosphate are good materials to remove Pb from water, but few studies have been done on Pb removal by biochar-orthophosphate composite. Here biochar-orthophosphate composites were prepared by co-pyrolyzing rape straw with orthophosphate (Ca(H2PO4)2·H2O / KH2PO4) at ratio of 5:1 (W:W), noted as WBC-Ca and WBC-K, respectively, so as to explore the Pb removal capacities and mechanisms of co-pyrolysis biochars. The sorption isotherms of Pb were well fitted with Langmuir model and the maximum sorption capacities of Pb by original biochar, WBC-Ca, and WBC-K were 184.1, 566.3 and 1559 mmol kg-1, respectively. The results of FTIR, XRD, and XPS analyses showed that phosphorus in biochar played an important role to remove Pb by forming lead-precipitates. However, the species of lead-precipitates in three types of Pb-loaded biochars were Pb5(PO4)3Cl, Pb2P2O7, and Pbn/2(PO3)n, individually, and that was because speciation of phosphorus had undergone significant thermochemical transformation during pyrolysis process. Orthophosphate in WBC-Ca was mainly transformed to pyrophosphate, while orthophosphate in WBC-K was transformed to both metaphosphate and pyrophosphate. The present results warrant the promising application of co-pyrolysis biochar derived from rape straw and orthophosphate in removal of Pb from wastewater.
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