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Chen, Xi
- Study on Snowmelt Runoff Under Climate Change Effect in Tianshan Mountain in China
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Authors
Affiliations
1 School of Resources and Environment Science, Xinjiang University, Urumqi 830046, CN
2 Jiang An Campus of Sichuan University, College of Architecture and Environment, Chengdu, 6102075, CN
3 Key Laboratory of Oasis Ecology, Ministry of Education, Xinjiang University, Urumqi 830046, CN
4 Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi 830011, CN
5 LREIS, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101, CN
1 School of Resources and Environment Science, Xinjiang University, Urumqi 830046, CN
2 Jiang An Campus of Sichuan University, College of Architecture and Environment, Chengdu, 6102075, CN
3 Key Laboratory of Oasis Ecology, Ministry of Education, Xinjiang University, Urumqi 830046, CN
4 Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi 830011, CN
5 LREIS, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science, Beijing 100101, CN
Source
Nature Environment and Pollution Technology, Vol 12, No 4 (2013), Pagination: 555-562Abstract
A major proportion of discharge in the Juntanghu river basin is contributed by its glacier-fed river and snow catchments situated in northern mid-slope of Tianshan Mountain, Northwest China. The Mann-Kendall trend test based on the 50 years data (1961 to 2011) were used for analysis of the climate change trends and the application of the SWAT model under different climate change scenarios show that watershed hydrological cycle would alter under different climatic scenarios. This suggests that the reservoirs will be necessary for large flow storage to meet the need of the flood control, water supply, etc.Keywords
Snowmelt Runoff, SWAT Analysis, Climate Change Effect, Tianshan Mountain.Full Text
- Preparation of Adsorbent CeO2-TiO2 and Enhanced Adsorptive Removal of Tetracycline
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Authors
Affiliations
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 4 (2016), Pagination: 1267-1272Abstract
In order to enhance the adsorption performance of TiO2, CeO2 was tentatively introduced into the matrix of TiO2 by sol-gel method. The prepared adsorbent CeO2-TiO2 was used for the efficient adsorptive removal of antibiotics tetracycline (TC). It was observed that the introduction of CeO2 into TiO2 matrix has improved the removal efficiency of TC by 57.6% compared to pure TiO2. The uptake of TC was highly dependent on the solution pH conditions and the highest uptake of TC occurred under alkaline condition. Linear simulation method failed to discern which kinetic model was better to describe the kinetic data between pseudo-first-order and pseudo-second-order models. By nonlinear simulation, Elovich kinetic model was found to be the best model to describe the TC adsorption onto CeO2-TiO2, indicating that the pronounced diffusion-control process was the rate-determining step. The maximal adsorption capacity of the prepared sorbent was 59.3 mg/g using Langmuir isotherm model at 298 K. The uptake of TC increased with an increase in the reaction temperature, which demonstrates that the adsorption of TC was endothermic.Keywords
CeO2-TiO2, Tetracycline, Adsorption, Kinetics, Isotherm.Full Text
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- Adsorption Performance for the Removal of Cu(II) on the Ammonium Acetate Modified Sugarcane Bagasse
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Authors
Affiliations
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
Source
Nature Environment and Pollution Technology, Vol 16, No 3 (2017), Pagination: 843-848Abstract
Sugarcane bagasse, an agricultural waste biomass was innovatively used to prepare ammonium acetate modified sugarcane bagasse via a simple wet impregnation method. The prepared adsorbent was used for the adsorptive removal of copper from aqueous solution. It was found that an increase in adsorbent dosage significantly increased the removal efficiency for copper. Compared to the raw bagasse, the adsorption capacity of the modified bagasse was dramatically enhanced by 116.2%. At pH 5.0, 7.0 and 9.0, the reaction kinetic data were simulated and compared using pseudo-first-order, pseudo-second-order and Elovich kinetic models. Results indicate that both pseudo-second-order and Elovich kinetic models could better describe the adsorption kinetics. This demonstrates that the adsorption of copper onto the modified bagasse was a chemisorption process in which the ratedetermining step is diffusion in nature. Thermodynamic analysis demonstrated the enthalpy and entropy of the adsorption process as 643.6 KJ mol-1 and 250.5 J mol-1 k-1, respectively. The positive value of the reaction enthalpy implies that the uptake of copper increases with a rise in the reaction temperature. The adsorption of copper was spontaneous and endothermic in nature.Keywords
Sugarcane Bagasse, Ammonium Acetate, Copper, Adsorption Kinetics.Full Text