期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 25, 期 22, 页码 22244-22258出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-2110-3
关键词
Box-Behnken; Chitosan; Beta-cyclodextrin; Nanometer zinc oxide; Adsorption; Cong red
资金
- National Key R&D Plan Project of China [2016YFC0400702-2]
- Fundamental Research Funds for the National Natural Science Foundation [21377041]
- Scientific and Technological Innovation Project of Foshan [2016IT100133]
In this paper, an effective chitosan/beta-cyclodextrin/nanometer zinc oxide (CS/beta-CD/Nano-ZnO) composite porous membrane was synthesized by sol-gel and polymer-assisted inverting method. Preparation conditions of CS/beta-CD/Nano-ZnO were investigated by single-factor and Box-Behnken response surface methodology optimizing triethoxyvinylsilane (JH-V151), beta-cyclodextrin (beta-CD), and nanometer zinc oxide (Nano-ZnO), and applied to study the adsorption characteristics of Cong red (CR) from aqueous solution using batch experiments. The optimum preparation conditions were determined that the volume fraction of JH-V151 alcohol solution was 11%, the ratio of beta-CD to CS was 5.35, and the ratio of Nano-ZnO's mass to solution's volume was 0.36%. Different characterization methods including field-emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, UV-visible spectroscopy, and Universal Materials Tester were used to prove the appearance, crystallinity, functional groups, swelling degree, transmittance, and tensile property of CS/beta-CD/Nano-ZnO. The optimized batch experimental parameters were 50 mg L-1, 4 h, 7.0, 0.5 g L-1, and 55.0 A degrees C as initial concentration, contact time, pH, adsorbent dose, and temperature, respectively. The maximum adsorption capacity on CR reached 96.33 mg g(-1), which is 4.34 times with respect to CS. The batch experimental data were best described by a pseudo-second-order kinetics model and Langmuir isotherm model (R (2) = 0.9965, theoretical saturated adsorption capacity 147.28 mg g(-1)). The values a dagger G were - 2.09, - 4.73, and - 7.37 kJ mol(-1) at 298, 308, and 318 K temperatures, respectively. The a dagger H value was 76.68 kJ mol(-1), indicating the endothermic and spontaneous adsorption in nature. The a dagger S value was 0.26 kJ mol(-1) K-1, a signal of entropy increase during adsorption. The adsorption capacity decreased only by 5.8% after six recycling runs, which indicated the reusability of CS/beta-CD/Nano-ZnO. Therefore, the CS/beta-CD/Nano-ZnO composite porous membrane is a promising membrane material for the efficient removal of CR from any water at large and economic scales at moderate concentration.
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