Journal
JOURNAL OF CLEANER PRODUCTION
Volume 256, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.120700
Keywords
Bentonite; Sulphate aluminate cement; Heavy metals; Adsorption; Removal efficiency
Categories
Funding
- Natural Science Foundation [2018JM5162]
- Shaanxi province, China
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The development of environment friendly and practically feasible technologies or adsorbents to treat water pollution due to heavy metals is urgently required. Herein, Sulphate aluminate cement - bentonite (SAC-bentonite) composites were synthesized and used as low-cost and high-efficiency adsorbents to remove Cr3+, Pb2+, and Cd2+ from aqueous solution. The characteristics of SAC-bentonite were analyzed via X-ray diffraction (XRD) and scanning electron microscopy (SEM). Effects of the amount of adsorbent, solution pH, and contact time on the adsorption performance of SAC-bentonite were also studied. The adsorption mechanism was analyzed via XRD, X-ray photoelectron spectroscopy (XPS), and SEM. The results demonstrate that the adsorption capacities of SAC-bentonite for Cr3+ were similar to that of pure bentonite or pure SAC, while the adsorption capacities for Pb2+ and Cd2+ were significantly higher than those for bentonite or SAC. When the ratio of bentonite to SAC was 1:1, the removal efficiency of SAC-bentonite for Cr3+, Pb2+, and Cd2+ was 99.956%, 99.838%, and 99.717%, respectively. The adsorption kinetics was well described by Pseudo-second-order equation. (C) 2020 Elsevier Ltd. All rights reserved.
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