生物炭
吸附
化学
水溶液中的金属离子
壳聚糖
金属
均苯四甲酸二酐
傅里叶变换红外光谱
铜
化学吸附
核化学
无机化学
化学工程
有机化学
热解
聚酰亚胺
图层(电子)
工程类
作者
Jiaqin Deng,Yunguo Liu,Shaobo Liu,Guangming Zeng,Xiaofei Tan,Binyan Huang,Xiaojun Tang,Shengfan Wang,Quan Hua,Yan Zhang
标识
DOI:10.1016/j.jcis.2017.07.069
摘要
In this work, a novel engineered biochar prepared through modification with chitosan and pyromellitic dianhydride (PMDA) was investigated as an adsorbent for the removal of heavy metal ions from single metal and mixed-metal solutions (Cd, Cu and Pb). Characterization experiments with FTIR and XPS suggested that the novel modified biochar had more surface functional groups compare to the pristine biochar. Adsorption experiments indicated that the initial pH of the solution influenced the ability of biochars to adsorb heavy metals in single- and multi-metal systems. Moreover, the chitosan-PMDA modified biochar had strong selective adsorption of Cu(II). Mechanism studies showed that chemisorption was the major mechanism for heavy metal removal by the chitosan-PMDA modified biochar. Furthermore, the types of effective functional group for these heavy metal removal were different. The NCO group played a dominant role in the process of Pb(II) removal, while several N-containing functional groups and CC groups participated in the adsorption of Cd(II). The novel engineered biochar had selective adsorption capacity for copper due to the N-containing functional groups, meanwhile abundant carbonyl groups also participated in the removal of copper, and may reduce Cu(II) to Cu(I).
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