Low-cost novel silica@polyacrylamide composites: fabrication, characterization, and adsorption behavior for cadmium ion in aqueous solution

Xiayi (Eric) Hu, Xuanping Luo, Gongkui Xiao, Qian Yu, Yuanyuan Cui, Gang Zhang, Rui Zhang, Yang Liu, Yefeng Zhou, Zhaogang Zeng

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Pollution during rapid industrialization process is a serious environmental problem that seriously affects people's lives and livelihoods. Among them, the pollution of excessive heavy metals in wastewater has attracted wide attention. The current study proposes a novel effective and low-cost silica@polyacrylamide composites (SP-C) to capture cadmium ion (Cd2+) from wastewater contaminated by heavy metal. The chemical and physical properties of the surface and interior of silica@polyacrylamide composites were studied by different characterization methods. The adsorption capacity and kinetics of cadmium ions in aqueous solutions using silica@polyacrylamide composites were also studied, and some discussions about the mechanism of adsorption process were made. Silica@polyacrylamide composites showed enhanced cadmium ions adsorption with the maximum adsorption capacity of 211.86 mg/g (pH 6.5, T = 318.15 K), which was fitted by Langmuir model. The adsorption experimental kinetic data of silica@polyacrylamide composites could be excellently verified by pseudo-second-order model. Moreover, a comparison of the cost between the proposed silica@polyacrylamide composites and other reported adsorbents is provided. And the results indicate that the silica@polyacrylamide composites adsorption cost is 0.16 $/g cadmium ion, which means a promising cost-effective adsorbent for cadmium ion removing.

Original languageEnglish
Pages (from-to)1051-1062
Number of pages12
JournalAdsorption
Volume26
Issue number7
Early online date19 Mar 2020
DOIs
Publication statusPublished - 1 Oct 2020

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