Competitive adsorption of Pb(II), Cd(II) and Cu(II) onto chitosan-pyromellitic dianhydride modified biochar
Competitive adsorption of Pb(II), Cd(II) and Cu(II) onto chitosan-pyromellitic dianhydride modified biochar
复制标题
壳聚糖-均苯四甲酸二酐改性生物炭对 Pb(II)、Cd(II) 和 Cu(II) 的竞争吸附
DOI：
10.1016/j.jcis.2017.07.069
复制
发表时间：
2017-11-15
影响因子：
9.9
通讯作者：
Yan, Zhili
中科院分区：
文献类型：
--
作者：
Deng, Jiaqin;Liu, Yunguo;Yan, Zhili
本文研究了壳聚糖和焦二酸酐（PMDA）改性制备的新型工程生物炭作为吸附剂去除单一金属和混合金属溶液（Cd、Cu和Pb）中的重金属离子。FTIR和XPS表征实验表明，与原始生物炭相比，新型改性生物炭具有更多的表面官能团。吸附实验表明，溶液的初始pH值影响生物炭在单金属和多金属体系中对重金属的吸附能力。此外，壳聚糖- pmda修饰的生物炭对Cu（II）具有较强的选择性吸附。机理研究表明，化学吸附是壳聚糖- pmda改性生物炭去除重金属的主要机理。此外，这些重金属去除的有效官能团类型也不同。N-C=O基团在Pb（II）的去除过程中起主导作用，而几个含n官能团和C=C基团参与了Cd（II）的吸附。新型工程生物炭由于含有n官能团，对铜具有选择性吸附能力，同时丰富的羰基也参与了铜的去除，可以将Cu（II）还原为Cu(I)。(C) 2017爱思唯尔公司版权所有。
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 N-C=O group played a dominant role in the process of Pb(II) removal, while several N-containing functional groups and C=C 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). (C) 2017 Elsevier Inc. All rights reserved.