吸附
壳聚糖
化学吸附
朗缪尔吸附模型
化学
水溶液
水溶液中的金属离子
动力学
复合数
浸出(土壤学)
核化学
化学工程
金属
无机化学
材料科学
复合材料
有机化学
工程类
物理
环境科学
量子力学
土壤科学
土壤水分
作者
Yaoyao Huang,Yu Shen,Guizhi Zhang,Peixiang Lu,Zhengsijia Wu,Rui Tang,Shiyuan Liu,Xing-Zheng Wu,Chuang Wang,Huaili Zheng
标识
DOI:10.1016/j.seppur.2023.123561
摘要
Separation and recovery of lead resources from lead-containing wastewater is very important to achieve reuse of lead(II) and environmental protection. Herein, a novel magnetic separation adsorbent, polymer-grafted silica-coated acid-resistant magnetic chitosan composite (PMSC), was facilely constructed and applied for the efficient and selective adsorption of Pb(II) from aqueous solutions. The adsorption results in the Pb(II) mono-contaminated system showed that the adsorption process of PMSC on Pb(II) was significantly pH-responsive and increased with increasing pH, reaching a qmax value of 88.03 mg g−1 at pH 6.0, which was more than 6 times of MSC (14.47 mg g−1). More interestingly, the adsorbent with inert silica coated on the core has a higher acid resistance, with almost no iron leaching from PMSC at pH 1.0, while PMC has 3.99 mg L−1 of iron leaching. The results of adsorption isotherms and kinetics of Pb(II) by PMSC showed that Langmuir and pseudo-second-order kinetics can better describe the adsorption behavior, indicating that the adsorption process was mainly controlled by chemisorption and the maximum monolayer adsorption capacity can reach 111.12 mg g−1 at 298.15 K. Furthermore, PMSC maintained about 80 % of the initial adsorption capacity after five cycles of repeated use, demonstrating its good regenerative cycling performance. Also, PMSC showed excellent selective adsorption of Pb(II) in the coexistence solutions of multiple metal ions with the SPb up to 85.83 %, which was far more than that of MSC (23.55 %), indicating that the polymer grafting had a significant enhancement on the selective performance of the adsorbent. This work could provide design and preparation insights for the development of novel, acid-resistant, recyclable and fast magnetic separation adsorbents for the efficient selective separation of lead ions.
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