Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (9): 2467-2473.doi: 10.1016/j.cjche.2020.04.023

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

Adsorption of cationic dyes from aqueous solution using hydrophilic silica aerogel via ambient pressure drying

Qun Liu1,2, Yuan Liu1, Zhihua Zhang2, Xiaodong Wang2, Jun Shen2   

  1. 1 College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China;
    2 Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Department of Physics Science and Engineering of Tongji University, Shanghai 200092, China
  • Received:2019-11-19 Revised:2020-04-17 Online:2020-09-28 Published:2020-10-21
  • Contact: Yuan Liu, Zhihua Zhang;
  • Supported by:
    This study was supported by the National Key Research and Development Program of China (2017YFA0204600), National Natural Science Foundation of China (11874288), and Fundamental Research Funds for the Central Universities from Tongji University.

Abstract: In order to remove the organic dyes of textile waste water, the silica aerogel was successfully prepared by using E-40 as a novel precursor and then dried in ambient pressure. The synthesized sample was verified by Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). After calcining, the hydrophilic silica aerogel (HSA) was used as adsorbent to remove Methylene Blue (MB), Malachite Green (MG), and Gentian Violet (GV) from aqueous solution. The effects of initial concentration of dyes and adsorbent dosage on the adsorption process were examined. It was found that HSA showed excellent adsorption capacities, the maximum percentage of removal dyes could reach 98%. Herein, the Langmuir, Freundlich and de Boer-Zwikker isotherm modes were employed to discuss the adsorption behavior. The results indicated that the de Boer-Zwikker model can effectively describe the adsorption behavior. Besides, the HSA could be utilized as the recyclable adsorbent in degradation experiment, after five cycles, no obvious loss of adsorption capacity was found. As an efficient, low-cost, environmental friendly and recyclable adsorbent, silica aerogel is expected to be used for dyes removal.

Key words: Silica aerogel, Adsorbents, E-40, Waste water, Adsorption, Cationic dyes