ADSORPTION OF PB2+ IN WATER BY ZR-CONTAINING SILICA RESIDUE AND ITS MECHANISM

Wanting Chen, Yuan Tian, Xuan Wang, Ruixin Ma, Hao Ding, Yu Tu and Han Zhang
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Wanting Chen: School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P. R. China
Yuan Tian: School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P. R. China
Xuan Wang: ��School of Energy Resources, China University of Geosciences, Xueyuan Road, Haidian District, Beijing 100083, P. R. China
Ruixin Ma: ��School of Chemical Safety, North China Institute of Science and Technology, Langfang, Hebei 065201, P. R. China
Hao Ding: �Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Material Sciences and Technology, China University of Geosciences, Xueyuan Road, Haidian District, Beijing 100083, P. R. China
Yu Tu: �Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Material Sciences and Technology, China University of Geosciences, Xueyuan Road, Haidian District, Beijing 100083, P. R. China
Han Zhang: �Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Material Sciences and Technology, China University of Geosciences, Xueyuan Road, Haidian District, Beijing 100083, P. R. China

Surface Review and Letters (SRL), 2024, vol. 31, issue 02, 1-13

Abstract: Zr-containing silica residue (Zr-s-r) is waste residue discharged during the industrial production of ZrOCl2. Its purified product (Zr-s-r-P) can be used as an adsorbent whose main component is amorphous SiO2. Herein, Pb(NO3)2 solution was used as wastewater containing Pb2+. The adsorption of Pb2+in water by Zr-s-r-P and its mechanism were studied. The results showed that the adsorption effect was affected by the initial concentration of Pb2+in the solution, pH, and adsorption time. The adsorption capacity of Zr-s-r-P to Pb2+was 45.3 mg/g under the optimized conditions (25∘C, pH=6, Zr-s-r-P dosage of 2 g/L, and adsorption time of 25 min). The process of adsorption fits the pseudo-second-order model, and the isothermal adsorption fits the Langmuir adsorption model. Pb2+was adsorbed in the pores of Zr-s-r-P. Moreover, the adsorption of Pb2+by ZSR-P was achieved through the reaction between Si–OH on the surface of SiO2 and Pb2+ hydroxyl compounds.

Keywords: Zr-containing silica residue; adsorption; Pb2+ (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1142/S0218625X24500173

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