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Degradation of Dye Wastewater by Pulsed High-Voltage Discharge Combined with spent tea leaves

Plasma Science and Technology 2014年第12期16卷 1135-1140页

作者：刘燕杨丽杨刚张延宗张小洪邓仕槐 Agricultural Environmental Engineering Center of Sichuan Province College of Resources &EnvironmentSichuan Agricultural University

Degradation of methylene blue （MB） was performed using the pulsed discharge process （PDP） combined with spent tea leaves （STLs）. The effects of STL dosage, concentration of initial solution, and pH were analyzed in the combined treatment. Results showed that the combined treatment was effective for dye wastewater degradation; when the dosage of STLs was 3.2 g/L, the degradation efficiency reached 90% after 15 rain treatment, and STLs showed a good repeatability. The degradation rate decreased with increasing initial MB concentration but not related to the solution pH in the combined treatment. Fourier-transform infrared spectra and N2 adsorption suggested that the number of acidic and basic groups in the STL surface increased after the treatment, but the surface area and pore volume remained unchanged.

关键词： pulsed discharge spent tea leaves dye wastewater degradation

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Optimization of methyl orange removal from aqueous solution by response surface methodology using spent tea leaves as adsorbent

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Frontiers of Environmental Science & Engineering 2014年第4期8卷 496-502页

作者： Liangzhi LI Xiaolin LI Ci WAN Weiqiang GUO Tianyi YANG Jiaolong FU Jiaoyan TANG Cuiying HU School of Chemistry and Bioengineering Suzhou University of Science and Technology Suzhou 215011 China Jiangsu Key Laboratory for Environment Functional Materials Suzhou University of Science and Technology Suzhou 215009 China Beijing Entry-exit Inspection and Quarantine Beijing 100026 China

The effective disposal of redundant tea waste is crucial to environmental protection and comprehensive utilization of trash resources. In this work, the removal of methyl orange （MO） from aqueous solution using spent tea leaves as the sorbent was investigated in a batch experiment. First, the effects of various parameters such as temperature, adsorption time, dose of spent tea leaves, and initial concentration of MO were investigated. Then, the response surface methodology （RSM）, based on Box- Behnken design, was employed to obtain the optimum adsorption conditions. The optimal conditions could be obtained at an initial concentration of MO of 9.75 mg·L-1, temperature of 35.3℃, contact time of 63.8 min, and an adsorbent dosage 3.90 g· L-1. Under the optimized condi- tions, the maximal removal of MO was 58.2%. The results indicate that spent tea leaves could be used as an effective and economical adsorbent in the removal of MO from aqueous solution.

关键词： spent tea leaves adsorption response surface methodology methyl orange (MO)

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