Teng Hua-Jing, Xia Tao, Li Cheng, Guo Jian-Zhong, Chen Lin, Wu Chunzheng, Li Bing
College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang 311300, PR China.
College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang 311300, PR China.
Bioresour Technol. 2023 Jun;377:128943. doi: 10.1016/j.biortech.2023.128943. Epub 2023 Mar 22.
An itaconate-functionalized hydrochar (IFHC) was prepared from one-step solvent-free radical copolymerization of bamboo hydrochar, itaconic acid, ammonium persulphate and sodium hydroxide in solvent-free environment, and was employed to absorb methylene blue (MB) and Pb(II) from wastewater. Characterizations show IFHC has rich carboxylate and tends to adsorb cationic contaminants. The largest adsorbed quantities of MB and Pb(II) by IFHC are up to 1036 and 291.8 mg·g at 298 K respectively as per the Langmuir isotherm. Sorption of MB and Pb(II) onto IFHC can be expressed well by Langmuir isotherm and pseudo-2nd-order kinetics equations. The high sorption performance depends on the rich carboxylate, which can adsorb MB/Pb(II) through an electrostatic interaction/inner-surface complexation mechanism. The sorptive capacity of regenerated IFHC decreased below 10% after 5 desorption-resorption cycles. Thus, the solvent-free free radical copolymerization is an environmentally-friendly strategy to synthesize novel efficient sorbents that can clean cationic contaminants from wastewater.
通过在无溶剂环境中使竹质生物炭、衣康酸、过硫酸铵和氢氧化钠进行一步无溶剂自由基共聚反应制备了一种衣康酸功能化生物炭（IFHC），并将其用于吸附废水中的亚甲基蓝（MB）和铅离子（Pb(II)）。表征结果表明，IFHC含有丰富的羧酸盐，易于吸附阳离子污染物。根据朗缪尔等温线，在298K时，IFHC对MB和Pb(II)的最大吸附量分别高达1036和291.8 mg·g。MB和Pb(II)在IFHC上的吸附能很好地用朗缪尔等温线和准二级动力学方程来描述。高吸附性能取决于丰富的羧酸盐，其可通过静电相互作用/内表面络合机制吸附MB/Pb(II)。经过5次解吸-吸附循环后，再生IFHC的吸附容量下降至10%以下。因此，无溶剂自由基共聚是一种环境友好型策略，可用于合成能从废水中清除阳离子污染物的新型高效吸附剂。
