Preparation of graphene oxide-modified palygorskite nanocomposites for high-efficient removal of Co(II) from wastewater
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RESEARCH ARTICLE
Preparation of graphene oxide-modified palygorskite nanocomposites for high-efficient removal of Co(II) from wastewater Hongmei Mou 1 & Xiaofeng Huang 1 & Qiulin Deng 1 & Qin Lei 1 & Hong Luo 1 & Jianhao Liang 1 & Xue Zhang 1 & Tinghong Zhang 1 & Xingjun Yao 2 & Lixiong Zhang 3 Received: 14 October 2019 / Accepted: 27 January 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Removing Co(II) from wastewater is urgent due to the threat to the environment and human health. In the work, the nanocomposite of graphene oxide-modified palygorskite (mPal-GO) is synthesized by cross-linking one-dimensional palygorskite (Pal) with two-dimensional material graphene oxide (GO), and used to remove Co(II) from wastewater. Its structure is characterized by Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area measurement. The parameters, such as mass ratio (GO:mPal), temperature, pH, and contact time, are carefully investigated. The results indicate that pseudo-second-order equation and Langmuir isotherm model are the best fitting one in the adsorption process of Co(II) onto mPal-GO. The maximum adsorption capacity achieves 16.9 mg/g at pH = 6.0 and T = 298 K according to the Langmuir model analysis. Furthermore, mPal-GO can be reused more than 5 times with a slight decrease according to the adsorption-desorption cycle experiments. Finally, mPal-GO with the low-cost and easy separation is a promising candidate for removing of Co(II) from wastewater. Keywords Graphene oxide . Palygorskite . Nanocomposite . Co(II) . Adsorption
Introduction Cobalt, as essential element present in various salts, is widely used in metallurgy, medical, and military industries (Wang 2006). As the fasting demand of industry, the water pollution caused by cobalt ion (Co(II)) has become a non-negligible problem that threatens the environment and cause great harm Responsible editor: Tito Roberto Cadaval Jr * Qiulin Deng [email protected] * Xingjun Yao [email protected] 1
School of Materials Science and Engineering, State Key Laboratory for Environment-friendly Energy Materials, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang 621010, People’s Republic of China
2
School of Chemistry and Chemical Engineering, Liaocheng University, 1 Hunan Road, Liaocheng 252059, People’s Republic of China
3
State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, People’s Republic of China
to human health (O’Connell et al., 2008). Thus, it is urgent to remove Co(II) from wastewater. Precipitation (Su et al. 2018), ion exchange (Song et al. 2018), solvent extraction (Wellens et al. 2013), and adsorption (Jamiu et al. 2017) are usually used to remove Co(II) from the aqueous solutions. Among these methods, removal of Co(II) is more effectively performed by ion exchange and adsorption on the solid so
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