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Systematic Investigation on the Adsorption Performance and Mechanism of MnO 2 /TA Nanoflowers for Cu(II) Removal from Aqueous Solution
Author(s) -
Gao Hongtao,
Xiu Master. Q.,
Wang Master. Y.,
Zhan Bachelor. Y.,
Deng Xiaoyan,
Xu Yongji,
Dai Dongmei,
Liu Xien,
Si Chongdian,
Liu Guangun
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201804044
Subject(s) - adsorption , aqueous solution , nanoflower , langmuir adsorption model , chemistry , hydrothermal circulation , chemical engineering , kinetics , manganese , nanocomposite , inorganic chemistry , materials science , nanotechnology , catalysis , organic chemistry , physics , quantum mechanics , engineering
Abstract In this work, a nanoflower‐type manganese dioxide composite with tannic acid (MnO 2 /TA) was prepared using a facile hydrothermal method. The maximum adsorption capacity of nanoflower MnO 2 /TA for Cu(II) removal from aqueous solution was 194.3 mg⋅g −1 , and this illustrated the excellent adsorptive activity of nanoflower MnO 2 /TA. Adsorption kinetics and isotherm investigations showed that pseudo second order kinetics and the Langmuir isotherm model fit the experimental data well. The surface complex formation model (SCFM) was used to study the adsorptive process and mechanism of Cu(II) adsorption on the surface of MnO 2 /TA. Further investigation indicated that the adsorption energies for various forms of Cu(II) were negative which indicated that Cu(II) adsorption on MnO 2 /TA was a spontaneous process. Electrostatic interactions and chemical complexation were involved in Cu(II) removal by MnO 2 /TA from aqueous solution. The decline of adsorption capacity was about 10% for MnO 2 /TA after being reused five times, and this showed that the adsorbent might be reused in Cu(II) removal. The MnO 2 /TA nanocomposite has been proven to be a low‐cost and efficient adsorbent that could be a potential material for use in environmental treatment. Understanding the adsorption mechanism might provide a technical basis for the processual design of heavy metal adsorbents.