Enhanced removal of Cr(VI) by cation functionalized bamboo hydrochar
Enhanced removal of Cr(VI) by cation functionalized bamboo hydrochar
复制标题
阳离子功能化竹水炭强化去除 Cr(VI)
DOI：
10.1016/j.biortech.2022.126703
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发表时间：
2022
影响因子：
11.4
通讯作者：
Bing Li
中科院分区：
文献类型：
--
作者：
Yu-Nan Zhang;Jian-Zhong Guo;Chunzheng Wu;Wei-Wei Huan;Lin Chen;Bing Li
对氢焦进行化学改性可以显著提高其去除废水中重金属离子的能力，但迄今为止，通过自由基反应对氢焦进行化学改性的研究还很少。以竹水热炭为原料，在过氧化苯甲酰引发下，通过甲基丙烯酸缩水甘油酯（GMA）与竹水热炭的接枝聚合反应，引入环氧基与二乙烯三胺进行胺化反应，再经盐酸处理，合成了一种带有− N+H2R的阳离子功能化水热炭（CFHC）。结果表明，CFHC对Cr（VI）的上级吸附容量为424.09 mg·g− 1，且在pH = 2时吸附量最大.结合一系列的表征和测试，得出吸附符合准二级和Freundlich方程，表明吸附过程是一个以静电反应、还原和表面络合为主的多层化学吸附过程。本研究证明了自由基聚合法可以有效地将氢焦转化为废水处理用的超强吸附剂。
Chemical modification on hydrochars can significantly improve their ability of removing heavy metal ions from wastewater, but so far no research has focused on the chemical modification through free radical reaction. In this work, a cation functionalized hydrochar (CFHC) bearing − N+H2R was synthesized by grafting-polymerization of glycidyl methacrylate (GMA) onto bamboo hydrochar under initiation by benzoyl peroxide, followed by the amination with the introduced epoxy group and diethylenetriamine and a subsequent hydrochloric acid treatment. The resulted CFHC exhibited a superior removal capacity of 424.09 mg·g−1for Cr(VI), and the highest sorption occurred at pH of 2. Combining a series of characterizations and tests, it was concluded that the sorption conformed to the pseudo-second-order and Freundlich equations, indicating a multilayer chemisorption process that mainly driven by electrostatic reaction, reduction, and surface complexation. This research proved that a free radical polymerization treatment could effectively transform hydrochars into super adsorbents for wastewater treatment.