A functionalized tannin-chitosan bentonite composite with superior adsorption capacity for Cr(VI)
Author:
Li Zhongmin1, Zou Peng1, Yang Junzhou1, Huang Miaoyang1, Zhang Linye12, Huang Chuanzhou1, Yang Funeng1, Huang Renyu1, Lv Songyi1, Wei Guangtao13
Affiliation:
1. School of Chemistry and Chemical Engineering , Guangxi University , Nanning 530004 , China 2. Guangxi Key Laboratory of Processing for Non-Ferrous Metallic and Featured Materials , Guangxi Zhuang Autonomous Region , Nanning 530004 , China 3. Guangxi Key Laboratory of Biorefinery , Naning 530007 , China
Abstract
Abstract
A novel functionalized tannin-chitosan bentonite composite (TCBC) was successfully synthesized. The formation of the composite was confirmed by the X-ray diffraction (XRD) patterns and Fourier transform infrared spectroscopy (FT-IR) analysis. The pHpzc of TCBC was 3.38. The influences such as pH, dosage of TCBC, temperature and initial Cr(VI) concentration on adsorption capacity were investigated. The experimental data indicated that the almost saturated adsorption of the TCBC towards Cr(VI) in 100 min. The maximum adsorption capacity was 262.08 mg/g at 333 K with initial pH = 2.5. The adsorption kinetics of Cr(VI) on TCBC followed the pseudo-second-order kinetics model. The isothermal data were well described by the models of Langmuir, Freundlich and Temkin. The results revealed that the adsorption of Cr(VI) on TCBC existed comprehensive effects and mainly belong to the chemisorption. The TCBC could keep good performances (q
e = 192.17 mg/g) in five runs, 1 M NaOH was used as eluent for desorption, which showed a high desorption efficiency. Studies showed TCBC prepared with low cost and green raw materials, and simple green preparation technology had high adsorption capacity, good reusability and acidic tolerance. By exploring the Cr(VI)-Cr(III) hybrid system, part of Cr(VI) was reduced to Cr(III) and adsorbed by TCBC. The optimal adsorption pH of Cr(III) was 5.0.
Funder
Guangxi Science Foundation Funded Project National Natural Science Foundation of China Undergraduates Innovation and Entrepreneurship Program in Guangxi
Publisher
Walter de Gruyter GmbH
Subject
Materials Chemistry,Polymers and Plastics,General Chemical Engineering
Reference64 articles.
1. Iqbal, M., Abbas, M., Nisar, J., Nazir, A., Qamar, A. Z. Chem. Int. 2019, 5, 1–80. https://doi.org/10.31221/osf.io/z2ynm. 2. Iqbal, M. Chemosphere 2016, 144, 785–802. https://doi.org/10.1016/j.chemosphere.2015.09.048. 3. Abbas, M., Adil, M., Ehtisham-ul-Haque, S., Munir, B., Yameen, M., Ghaffar, A., Shar, G. A., Tahir, M. A., Iqbal, M. Sci. Total Environ. 2018, 626, 1295–1309. https://doi.org/10.1016/j.scitotenv.2018.01.066. 4. Shaban, M., Abukhadra, M. R., Rabia, M., Elkader, Y. A., Abd El-Halim, M. R. Rend. Lincei. Sci. Fis. Nat. 2018, 29, 141–154. https://doi.org/10.1007/s12210-018-0673-z. 5. Baral, A., Engelken, R. D. Environ. Sci. Policy 2002, 5, 121–133. https://doi.org/10.1016/s1462-9011(02)00028-x.
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