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Zhu, Lingfeng
- Study on Adsorptive Removal of 1,4-Benzoquinone by Agricultural Waste Sugarcane Bagasse
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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 1 (2016), Pagination: 205-210Abstract
As one of the major oxidation intermediates generated in advanced oxidation processes, 1,4-benzoquinone is proved to be highly toxic. Adsorptive removal of 1,4-benzoquinone by sugarcane bagasse, a low-cost agricultural waste, was systematically investigated. It was observed that most of the adsorption occurred within the initial 30 min. The results showed that Elovich kinetic model could better describe the kinetic data under all the solution pH conditions examined by non-linear regressive method. Pseudo-second-order kinetic model apparently fitted the experimental data better than pseudo-first-order kinetic model when using linear simulation method. The adsorption process was highly pH dependent, with the greatest adsorption occurring under neutral pH condition, and the highest uptake of 4.5 mg/g was achieved at pH 8.0. Ionic strength test indicated that 1,4-benzoquinone adsorption might form outer-sphere surface complexes with sugarcane bagasse. Natural organic matter (humic acid) significantly inhibited the uptake of 1,4-benzoquinone onto sugarcane bagasse. The study showed that sugarcane bagasse has a great potential application for the adsorptive removal of toxic 1,4-benzoquinone.Keywords
Sugarcane Bagasse, 1,4-Benzoquinone, Biosorption, Kinetics, Water Purification.- Preparation of Adsorbent CeO2-TiO2 and Enhanced Adsorptive Removal of Tetracycline
Abstract Views :137 |
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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.References
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