期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 49, 页码 27449-27457出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09366
关键词
Cr-doped ZnO; adsorption; methyl orange; kinetics; isotherm
资金
- National Natural Science Foundation of China [51572137, 51272117, 51172115]
- Natural Science Foundation of Shandong Province [ZR2015PE003, ZR2011EMZ001, ZR2011EMQ011, ZR2013EMQ006]
- Research Award Fund for Outstanding Young Scientists of Shandong Province [BS2013CL040]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20123719110003]
- Tackling Key Program of Science and Technology in Shandong Province [2012GGX1021]
- Application Foundation Research Program of Qingdao [13-1-4-117-jch, 14-2-4-29-jch]
- Shandong Province Taishan Scholar Project
- Overseas Taishan Scholar Project
In this paper, a mild solvothermal method has been employed to successfully synthesize a series of Cr-doped ZnO nanoparticles (NPs) with different Cr3+ contents, which is a kind of novel and high-efficiency absorbent for the removal of acid dye methyl orange (MO) from aqueous solution. The as-prepared products were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Brunauer, Emmet, and Teller (BET), and Zeta potential measurements. In accordance with the adsorption capacity of the products, the obtained optimal Cr/Zn molar ratio is 6%. The adsorption process of MO on Cr-doped ZnO was investigated by kinetics, thermodynamics, and isotherm technologies, which, respectively, indicated that the adsorption was fast (adsorption reached equilibrium in 2 h) and followed a pseudo-second-order model, that the adsorption process was spontaneous and endothermic, and that it agreed well with the Langmuir isotherm with a maximum adsorption capacity of 310.56 mg g(-1). Moreover, a reasonable mechanism was proposed to elucidate the reasons for their adsorption behavior. In addition, a simple and low-cost chemical method was developed to separate and recycle ZnO and MO from the used adsorbent, effectively avoiding the secondary pollution. This work can not only describe efficient experimental approaches for obtaining novel adsorbents and recycling them but also offer valuable clues for the preparation and property study of other semiconductor adsorbents.
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