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用碱式醋酸铝制备的氢氧化铝改性凹凸棒石对镉的吸附作用

Cadmium adsorption onto aluminum hydroxide-modified attapulgite prepared with basic aluminum acetate.

作者信息

Zhang Qinhu, Chu Run, Wei Yuzhen, Lu Qian, Cai Liqun

机构信息

College of Resources and Environment, Gansu Agricultural University, Lanzhou, 730070, China.

出版信息

Sci Rep. 2024 Dec 28;14(1):31428. doi: 10.1038/s41598-024-83331-5.

DOI:10.1038/s41598-024-83331-5
PMID:39732960
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11682426/
Abstract

Cadmium pollution in water is becoming increasingly serious. Thus, the effective removal of Cd(II) from water has garnered attention. Aluminum hydroxide-modified attapulgite (ATP-AC) was prepared from basic aluminum acetate through a coprecipitation method that could efficiently adsorb Cd(II) in aqueous solution. Seven characterization methods were utilized to investigate the properties of ATP-AC. Batch experiments were carried out to research the effects of pH, adsorption time, Cd(II) concentration and dosage on the Cd(II) adsorption ability of ATP-AC. The results revealed that the optimal conditions for the adsorption of Cd(II) by ATP-AC were pH = 7, a dosage of 0.4 g L, and and equilibrium time of 6 h. The Freundlich adsorption isotherm model better described Cd(II) adsorption by ATP-AC than did the Langmuir model. The maximum adsorption capacities at temperatures of 293, 303 and 313 K were 5.55, 10.35 and 12.95 mg g, respectively. The pseudo-second-order kinetic equation was more appropriate for describing the adsorption of Cd(II) by ATP-AC than the pseudo-first-order kinetic equation was. The thermodynamic parameters indicated that Cd(II) adsorption by ATP-AC is endothermic and spontaneous and proceeds in the direction of disorder. The increased specific surface area and increased number of hydroxyl group active sites are the main reasons for the improved Cd(II) adsorption capacity of ATP-AC.

摘要

水体中的镉污染日益严重。因此，从水中有效去除Cd(II)已受到关注。通过共沉淀法由碱式醋酸铝制备了氢氧化铝改性凹凸棒石（ATP-AC），其能有效吸附水溶液中的Cd(II)。采用七种表征方法研究了ATP-AC的性质。进行了批量实验以研究pH值、吸附时间、Cd(II)浓度和用量对ATP-AC吸附Cd(II)能力的影响。结果表明，ATP-AC吸附Cd(II)的最佳条件为pH = 7、用量为0.4 g/L、平衡时间为6 h。Freundlich吸附等温线模型比Langmuir模型能更好地描述ATP-AC对Cd(II)的吸附。在293、303和313 K温度下的最大吸附容量分别为5.55、10.35和12.95 mg/g。准二级动力学方程比准一级动力学方程更适合描述ATP-AC对Cd(II)的吸附。热力学参数表明，ATP-AC对Cd(II)的吸附是吸热的、自发的，且朝着无序方向进行。比表面积的增加和羟基活性位点数量的增加是ATP-AC对Cd(II)吸附能力提高的主要原因。

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