Photocatalytic reduction of Cr(VI) to Cr(III) in solution containing ZnO or ZSM-5 zeolite using oxalate as model organic compound in environment |
| |
| Authors: | Dadong Shao Xiangke Wang Qiaohui Fan |
| |
| Affiliation: | 1. Department of Environmental Engineering, National I-Lan University, No. 1 Sheen-Long Road, I-Lan City 260, Taiwan;2. College of the Environment and Ecology, Xiamen University, South Road of Xiangan, Xiamen 361102, Fujian, China;3. Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, 10617 Taipei, Taiwan;1. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China;2. Analytical Instrumentation Center, State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;3. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China;4. State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China;1. College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China;2. School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing 312000, China;1. J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolej?kova 3, Prague 8 CZ-182 23, Czech Republic;2. Research Institute of Inorganic Chemistry, Unipetrol Group, Revolu?ní 1521, Ústí n/Labem CZ-400 01, Czech Republic |
| |
| Abstract: | Photocatalytic reduction of Cr(VI) to Cr(III) in aqueous solution containing ZnO or ZSM-5 zeolite under ambient condition was studied by using oxalate as model organic compound in the natural environment. ZSM-5 zeolite was characterized by X-ray diffraction (XRD), and point of zero net proton charge (PZNPC) titration. The effect of illumination time, mass content of catalyst (m/V), Cr(VI) initial concentrations, pH, ionic strength, and oxalate concentrations on the photocatalytic reduction of Cr(VI) was determined. The results indicate that the PZNPC of ZSM-5 zeolite is at pH 3.6 ± 0.1. At CCr(VI)(initial)] = 2.00 × 10?4 mol/L, pH 7.5 ± 0.1 and after illumination time of 24 h, the reduction of Cr(VI) were 1.1 × 10?5 mol/L (no ZSM-5 zeolite, 4.0 × 10?3 mol/L oxalate) and 1.0 × 10?5 mol/L (0.4 g/L ZSM-5 zeolite, no oxalate), respectively; whereas the reduction of Cr(VI) achieved 1.0 × 10?4 mol/L in the presence of 0.4 g/L ZSM-5 zeolite and 4.0 × 10?3 mol/L oxalate. The removal of Cr(VI) from solution is dependent on pH value. The results are important for the application of zeolites in the treatment of Cr(VI) polluted solution in the natural environment. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
