Facile Preparation of Thiolated Reduced Graphene Oxide Aerogels for Efficient Removal of Cu(II) Ion from Water
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Facile Preparation of Thiolated Reduced Graphene Oxide Aerogels for Efficient Removal of Cu(II) Ion from Water Jie Li & Jianjun Bao
Received: 27 March 2020 / Accepted: 17 November 2020 # Springer Nature Switzerland AG 2020
Abstract In our research, thiolated reduced graphene oxide aerogels (TrGOAs) was successfully prepared by using graphene oxide (GO) as precursor and sodium hydrosulfide (NaSH) as reductant via a one-pot one-step hydrothermal route under normal pressure and a subsequent freeze-drying, used as a novel carbon-based adsorptive material for adsorbing Cu(II) ions from deionized water. These aerogels show excellent adsorption ability towards Cu(II) ions, which have a huge adsorption amount around 421.21 mg·g−1. We studied the mechanism of the adsorption process of TrGOA-5, and the results found that the pseudo-second-order kinetic model and the Freundlich isotherm model were able to describe this process well. We also explored the interference of pH values in copper ion solutions during this adsorption process, suggesting that increasing pH is good for obtaining a higher adsorption capacity. In addition, solid-liquid separation can be readily realized by filtration and centrifugation after the end of the adsorption experiment. Overall, this research offers a relatively simple and cut-price strategy to obtain thiolated reduced graphene oxide aerogels, and these novel graphene-based adsorbents have a superior adsorption ability and recyclability in segregating copper ions from polluted water. J. Li : J. Bao State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China J. Li : J. Bao (*) Research Center for Application of Graphene, Sichuan University-WuXi, Wuxi 214000, China e-mail: [email protected]
Keywords Graphene aerogel . Thiolated . Cu(II) . Absorption
1 Introduction A large amount of metals are introduced into the aquatic system and cause water pollution mainly because of human activities such as overexploitation and processing of mineral resources and the massive use of chemical fertilizers and pesticides. The most common heavy metal contaminants are copper, mercury, lead, chromium, cadmium, zinc, and tin (Shen et al. 2013; Zhao et al. 2013). Among them, copper is one of the major toxic metal contaminants ions emanating from mining, chemical and mechanical polishing, metal finishing, and especially electroplating industries. Excess copper ions in surface water and groundwater are very detrimental to the biological health of nature. In the case of very low copper ion concentration, the toxicity of the aqueous solution is still relatively large, so it is necessary to reduce the concentration of copper ions in the wastewater before it can be discharged into the uncontaminated water (Dong et al. 2015; Al-Saydeh et al. 2017). Up to now, lots of investigators have dedicated to purify the contaminated water containing heavy metal ions, and a variety of corresponding wastewater treatment methods such as adsorption (Zhao et al. 2015a), ion
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