Facile preparation of sulfhydryl modified montmorillonite nanosheets hydrogel and its enhancement for Pb(II) adsorption

Yiheng Miao; Weijun Peng; Yijun Cao; Luping Chang; Guixia Fan; Futao Yu

doi:10.1016/j.chemosphere.2021.130727

Facile preparation of sulfhydryl modified montmorillonite nanosheets hydrogel and its enhancement for Pb(II) adsorption

Chemosphere. 2021 Oct:280:130727. doi: 10.1016/j.chemosphere.2021.130727. Epub 2021 Apr 30.

Authors

Yiheng Miao¹, Weijun Peng², Yijun Cao³, Luping Chang¹, Guixia Fan¹, Futao Yu⁴

Affiliations

¹ Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, Henan, 450001, PR China.
² Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, Henan, 450001, PR China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan, 450001, PR China; National and Local Joint Engineering Research Center for Green Mineral Metallurgy and Processing, Zhengzhou, Henan, 450001, PR China; Provincial and Ministerial Joint Innovation Center for Resource Materials, Zhengzhou, Henan, 450001, PR China. Electronic address: pwj@zzu.edu.cn.
³ Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, Henan, 450001, PR China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan, 450001, PR China; National and Local Joint Engineering Research Center for Green Mineral Metallurgy and Processing, Zhengzhou, Henan, 450001, PR China; Provincial and Ministerial Joint Innovation Center for Resource Materials, Zhengzhou, Henan, 450001, PR China. Electronic address: yijuncao@126.com.
⁴ Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province, Chengdu Analytical & Testing Center, Sichuan Bureau of Geology & Mineral Resources, Chengdu, 610081, PR China.

PMID: 33964761
DOI: 10.1016/j.chemosphere.2021.130727

Abstract

In the work, sulfhydryl functionalized montmorillonite nanosheets based hydrogel balls were firstly synthesized for Pb(II) adsorption, and then characterized by scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR), surface area analyzer (BET), thermogravimetry (TG), and zeta potential. Effects of initial solution pH, adsorbent dosage, contact time, temperature on Pb(II) adsorption of the resulting hydrogel balls were investigated systematically. The experimental results showed that the increase amount of sulfhydryl functionalized montmorillonite nanosheets (MMTNs-SH) maintained the hydrogel balls a better porous structure and bigger specific surface area, endowing it a bigger adsorption capacity. The adsorption process was fitted well with pseudo-second-order kinetics model and Freundlich model, and more than 97% of Pb(II) could be removed under the optimum conditions. Moreover, hydrogel spheres have a certain cycle performance. In addition, the interactions between Pb(Ⅱ) ions and the oxygen atoms in the hydroxyl groups and the sulfur atoms in the sulfhydryl groups, and the ion exchange in MMTNs-SH dominated the adsorption.

Keywords: Facile preparation; Hydrogel balls; Montmorillonite nanosheets; Pb(II) adsorption; Sulfhydryl functionalized montmorillonite nanosheets.

MeSH terms

Adsorption
Bentonite*
Hydrogels
Hydrogen-Ion Concentration
Kinetics
Lead
Spectroscopy, Fourier Transform Infrared
Water Pollutants, Chemical*

Substances

Hydrogels
Water Pollutants, Chemical
Bentonite
Lead