标题: Green synthesis of poly(pyrrole methane)-based adsorbent for efficient removal of chromium(VI) from aqueous solution

作者: Yajun Ji, Feiya Xu, Panli Zhang, Yuanyi Xu, Gaili Zhang

来源出版物: Journal of Cleaner Production

DOI: 10.1016/j.jclepro.2021.126197

出版年: 2021

文献类型: Article

语种: 英文

摘要: It has attracted more and more attention to deal with chromium(VI) (Cr(VI)) pollution in wastewater due to its potential harm to human health. In this study, poly(pyrrole methane) (PPm), a potential material for Cr(VI) adsorption, was greenly synthesized for the removal of Cr(VI) from aqueous solution. Further, the Fe₃O₄ nanoparticles were loaded on the surface of PPm to enhance the separation property. The adsorption of Cr(VI) was favorable at a lower pH value, and it conformed to Langmuir and pseudo-second order model. When the solution pH was 2, the dosage of PPm was 0.5 g·L^-1, the reaction temperature was 45 ^oC, and the reaction time was 24 h, the maximum adsorption capacity of PPm reached 922.49 mg·g^-1, which was higher than most of the reported adsorbents (40-560 mg·g^-1). The removal rates reached about 100% even in the presence of competitive ions. The as-prepared adsorbent can be reused for 5 times and the removal rate still exceeded 70%. The adsorption mechanisms of Cr(VI) onto PPm included electrostatic interactions, ion exchange, reduction of Cr(VI) to Cr(III), and immobilization of Cr(III). Although the adsorption capacity of PPm/Fe₃O₄ was lower than that of pure PPm (549.75 mg·g^-1), it can be facilely separated from aqueous solution after adsorption. Notably, this study also provided a facile strategy to prepare adsorbent with active functional groups for efficient removal of Cr(VI) from aqueous solution.

关键词: Poly(pyrrole methane); Fe₃O₄; Chromium(VI); Adsorption; Reduction

影响因子: 7.246

论文连接: https://doi.org/10.1016/j.jclepro.2021.126197