Cr(VI) Adsorption from Aqueous Solution by UiO-66 Modified Corncob

Hongzhong Xie, Yanlei Wan, Hao Chen, Guangcheng Xiong, Lingqing Wang, Qi Xu, Xiang Li and Qiuhong Zhou
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Hongzhong Xie: Changjiang Institute of Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, China
Yanlei Wan: Changjiang Institute of Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, China
Hao Chen: Changjiang Institute of Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, China
Guangcheng Xiong: Changjiang Institute of Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, China
Lingqing Wang: Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Qi Xu: Changjiang Institute of Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, China
Xiang Li: Changjiang Institute of Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, China
Qiuhong Zhou: Changjiang Institute of Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, China

Sustainability, 2021, vol. 13, issue 23, 1-16

Abstract: To adsorb hexavalent chromium (Cr(VI)) in polluted water, this paper prepared a UiO-66 (Zr 6 O 4 (OH) 4 (BDC) 12 ) modified granular corncob composite adsorbent by hydrothermal method with in situ loading of UiO-66 on pretreated corncob particles. The physicochemical properties of the synthesized samples were characterized. Batch adsorption experiments were conducted to investigate the adsorption process of aqueous Cr(VI) under various conditions (different ionic strength, pH and co-existing anions). The results showed that UiO-66 was successfully loaded on the modified corncob particles. The isothermal adsorption data of Cr(VI) adsorption by the UiO-66 modified corncob fit well with the Langmuir model with the maximum adsorption capacity of Cr(VI) on UiO-66@Corn + being 90.04 mg/g. UiO-66 loading could increase Cr(VI) adsorption capacity of Corn + . The kinetic study showed that the equilibrium time for Cr(VI) adsorption on UiO-66 modified corncob was about 180 min and the kinetic data followed the pseudo-secondary kinetic model. The Cr(VI) adsorption capacity on UiO-66@Corn + decreased with the increasing solution pH, and the optimum pH range was 4–6. The ionic strength has little effect on the Cr(VI) adsorption capacity, but the coexistence of CO 3 2− , SO 4 2− and PO 4 3− in the solution could significantly decrease the equilibrium adsorption capacity of Cr(VI). The adsorption mechanism analysis showed that Cr(VI) was adsorbed on the surface of adsorbents through electrostatic attraction and was reduced further to the less toxic Cr(III) by the electron donor on the surface of adsorbent. The electrostatic interaction was the main force affecting the adsorption of Cr(VI) by UiO-66. UiO-66@Corn + had an excellent removal efficiency of Cr(VI) and excellent reusability. UiO-66@Corn + could effectively remove Cr(VI) from water and have a promising application.

Keywords: UiO-66; corncob; adsorption; Cr(VI); agricultural wastes (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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