Molybdenum disulfide anchored peanut shell biochar composite for efficient adsorption of Pb2+: Performance and mechanism

Heavy metal lead (Pb2+) contamination in water poses a serious threat to human health, and developing some effective strategies for the removal of Pb2+ is urgent. Herein, molybdenum disulfide (MoS2) anchored peanut shell biochar (BC) composite adsorbents were successfully prepared by hydrothermal me...

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Published inColloids and surfaces. A, Physicochemical and engineering aspects Vol. 700; p. 134830
Main Authors Zhang, Yuanmeng, He, Jifang, Xiao, Jiangrong, Jiang, Liangcai, Fan, Guozhi, Song, Guangsen, Yan, Juntao, Chai, Bo
Format Journal Article
LanguageEnglish
Published Elsevier B.V 05.11.2024
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Summary:Heavy metal lead (Pb2+) contamination in water poses a serious threat to human health, and developing some effective strategies for the removal of Pb2+ is urgent. Herein, molybdenum disulfide (MoS2) anchored peanut shell biochar (BC) composite adsorbents were successfully prepared by hydrothermal method and applied for the adsorption of Pb2+. Among these composites, the MoS2/BC-3 composite displayed the best adsorption performance with the adsorption capacity of 232 mg·g−1 at 30 °C. The adsorption procedure followed the pseudo-secondary kinetics and Freundlich adsorption model, indicating that the adsorption process of Pb2+ over MoS2/BC-3 composite was chemical and multilayer adsorption. Moreover, Pb2+ was spontaneously adsorbed by MoS2/BC-3, and the adsorption capacity increased with the enhance of temperature. The main mechanisms involved in the adsorption of Pb2+ by MoS2/BC-3 composite were found to include electrostatic interaction and complexation interaction. In addition, the MoS2/BC-3 composite had a good stability, and the Pb2+ removal rate could still reach more than 80 % after 6 cycles of adsorption experiments. Meanwhile, the adsorbent demonstrated a strong ability to absorb common heavy metals including copper and cadmium, further confirming that the MoS2/BC-3 composite had a potential value. [Display omitted] •The MoS2/BC composite adsorbents were prepared by hydrothermal method using peanut shell biochar as a carrier.•The MoS2/BC-3 composite displayed the outstanding adsorption performance for Pb2+.•The main adsorption mechanisms were clarified by FTIR, BET and XPS tests.•The MoS2/BC-3 composite exhibited a good stability and reusability.
ISSN:0927-7757
DOI:10.1016/j.colsurfa.2024.134830