Premium
Desorption Regeneration Performance of Magnetic Bentonite after Pb(II) Adsorbed
Author(s) -
Zou Chenglong,
Jiang Wei,
Liang Jiyan,
Guan Yinyan,
Sun Xiaohang
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.201802613
Subject(s) - desorption , bentonite , adsorption , saturation (graph theory) , langmuir adsorption model , environmental pollution , chemical engineering , chemistry , materials science , environmental science , organic chemistry , environmental protection , mathematics , combinatorics , engineering
Bentonite and its modifications have been widely used in the environmental pollution control and adsorption of heavy metals ions due to the large surface area, high adsorption capacity and low cost. However, it will become hazardous solid waste after saturation adsorption with a difficult problem to treat it. So the saturated adsorbent after adsorption of heavy metal ions needs to be disposed of properly. It will be of great scientific and economic value to study the regeneration recycling of bentonite after heavy metals ions adsorption. Desorption regeneration of magnetic bentonite (M−B) after Pb(II) adsorption with NaNO 3 solution was studied in this paper. The effects of several parameters on desorption regeneration were explored and it showed effective desorption regeneration performance. The desorption rate reached 90.21% using 50 mL g –1 and 1.00 mol L –1 NaNO 3 desorption liquid at pH 3.0, 35 °C for the first time.The desorption process better conformed to the second‐order kinetic equation and the Langmuir model. The physical and chemical feature of regenerated M−B and the original were comparatively analyzed by XRD, FT‐IR, SEM and BET. It showed that M−B still remained stable structure after 6 times adsorption–desorption cycles. The study will provide useful experiences and references for its high effective utilization.