Effects of Bentonite Activation Methods on Chitosan Loading Capacity

DOI: https://doi.org/10.9767/bcrec.13.1.1040.14-23
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Submitted: 24-03-2017
Published: 02-04-2018
Section: Original Research Articles
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The adsorption capacity of bentonite clay for heavy metal removal from wastewater can be significantly enhanced by a high loading of chitosan on the surface. In order to enhance the chitosan loading, we tested activating bentonite clay by three methods prior to chitosan loading: sulfuric acid, calcination, and microwave treatments. Meanwhile, several parameters during chitosan loading, namely the initial chitosan concentration, stirring speed, reaction time, temperature, and pH value were investigated. Our results indicate that chitosan is attached to bentonite clay through intercalation and surface adsorption according to X-ray Diffraction (XRD), Scanning Eelectron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FTIR) analyses. The maximum chitosan loading on 200-mesh raw bentonite clay (126.30 mg/L) was achieved under the following conditions: the initial chitosan concentration of 1000 mg/L, the stirring speed of 200 rpm, pH of 4.9, 60 min of reaction time, and temperature of 30 °C. The chitosan loading was further increased to 256.30, 233.70, and 208.83 mg/g, when using bentonite clay activated through 6 min of microwave irradiation (800 W), 10 % sulfuric acid treatment, and calcinations at 600 °C, respectively. When the chitosan loading was increased from 34.76 to 233.7 mg/g, the removal percentages of Cu(II), Cr(VI), and Pb(II) were improved, respectively from 78.90 to 95.5 %, from 82.22 to 98.74 %, from 60.09 to 86.18 %. Copyright © 2018 BCREC Group. All rights reserved

Received: 14th March 2017; Revised: 17th July 2017; Accepted: 18th July 2017; Available online: 22nd January 2018; Published regularly: 2 April 2018

How to Cite: Yu, T., Qu, C., Fan, D., Xu, R. (2018). Effects of Bentonite Activation Methods on Chitosan Loading Capacity. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (1): 14-23 (doi:10.9767/bcrec.13.1.1040.14-23)

 

Keywords

Chitosan; chitosan-loaded bentonite; bentonite activation; loading properties

  1. Tao Yu 
    School of Chemical Engineering, Northwest University, China
  2. Chengtun Qu 
    College of Chemistry and Chemical Engineering, Xi’an Shiyou University, China
  3. Daidi Fan 
    School of Chemical Engineering, Northwest University, China
  4. Renjun Xu 
    Department of Chemical Engineering, Xi’an Light Industry Research Institute, China
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