Low-cost novel silica@polyacrylamide composites: fabrication, characterization, and adsorption behavior for cadmium ion
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Low‑cost novel silica@polyacrylamide composites: fabrication, characterization, and adsorption behavior for cadmium ion in aqueous solution Xiayi (Eric) Hu1,5 · Xuanping Luo1 · Gongkui Xiao2 · Qian Yu1 · Yuanyuan Cui1 · Gang Zhang1 · Rui Zhang1 · Yang Liu3 · Yefeng Zhou1 · Zhaogang Zeng4,5 Received: 26 August 2019 / Revised: 9 March 2020 / Accepted: 16 March 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
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. Keywords Amino-functionalized silica · Polyacrylamide · Cadmium ion capture · Wastewater · Cost estimation
1 Introduction
Xiayi (Eric) Hu and Xuanping Luo are co-first authors. * Xiayi (Eric) Hu [email protected] * Yefeng Zhou [email protected] 1
College of Chemical Engineering, Xiangtan University, Xiangtan 411105, People’s Republic of China
2
Department of Chemical Engineering, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
3
Hunan BG Well-Point Environmental Science & Technology Co., Ltd, Changsha 41000, People’s Republic of China
4
Xiangtan Sepiolite Technology Co., Ltd, Xiangtan 411100, People’s Republic of China
5
Hunan Provincal Engineering Research Center of Sepiolite Resource for Efficient Utilization, Xiangtan 411100, Hunan, People’s Republic of China
Water is a vital resource for all living organisms on our planet. However, water quality has been affected by human being activities, which leads to severe menace for water source. Heavy metals are such a group of water pollutants that can cause serious environmental and health problems (Fu and Wang 2011). Cadmium ion ( Cd2+), in particular, is a highly toxic heavy metal that can adverse
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