Spent green tea leaves for decolourisation of raw textile industry wastewater
Spent green tea leaves for decolourisation of raw textile industry wastewater
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DOI：
10.1111/cote.12029
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发表时间：
2013-08
影响因子：
1.8
通讯作者：
C. Weng;Yao-Tung Lin;Yen-Jung Chen;Y. Sharma
中科院分区：
文献类型：
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作者：
C. Weng;Yao-Tung Lin;Yen-Jung Chen;Y. Sharma
根据美国染料制造商协会的值，废水样品的真颜色测量用于评估使用废绿色茶叶粉末废物的纺织废水脱色的有效性。在分批吸附实验中使用具有868 A色度的原废水样品。结果表明，在酸性溶液和高温下，纺织原废水的真色去除率很高，表明系统具有吸热性质。采用傅立叶变换-红外光谱法对绿色茶叶粉废弃物中参与吸附的主要官能团进行了分析。吸附动力学数据进行了建模，使用修改后的Freundlich和颗粒内扩散动力学方程。由Langmuir吸附等温线的拟合结果可知，绿色茶叶废弃物粉末的吸附容量为775 A·g-1，高于粉末活性炭的吸附容量（526 A·g-1）。低活化能值（13.9 kJ mol−1）表明吸附受扩散过程控制，反应涉及物理吸附机制。从废物利用、显着的颜色吸附能力和廉价且丰富的可用性的角度来看，绿色茶叶废物是纺织废水脱色的有吸引力的替代品。由于高温有利于脱色，绿色茶叶粉可直接用于纺织废水处理。
True colour measurements of wastewater samples, in terms of American Dye Manufacturers' Institute values, were used to evaluate the effectiveness of decolourisation of textile wastewater using spent green tea leaf powder waste. Raw wastewater samples with a true colour of 868 ADMI were used in the batch adsorption experiments. Results revealed that the true colour removal efficiency of the raw textile wastewater was high in acidic solution and at high temperature, indicating an endothermic nature of the system. The major functional groups of the green tea leaf powder waste involved in adsorption were identified by Fourier Transform-infrared spectroscopy analysis. Adsorption kinetic data were modelled using the modified Freundlich and intraparticle diffusion kinetics equations. Fitting results of the Langmuir adsorption isotherm showed that the adsorption capacity of the green tea leaf powder waste was 775 ADMI g−1, which is higher than that of powder activated carbon (526 ADMI g−1). The low activation energy values (13.9 kJ mol−1) suggested that adsorption was governed by a diffusion process and the reaction involved a physisorption mechanism. From the perspectives of waste utilisation, remarkable colour adsorption capacity and inexpensive and abundant availability, green tea leaf waste is an attractive alternative for decolourisaton of textile wastewater. Because high temperature favours colour removal, green tea leaf powder can be directly applied in raw textile wastewater treatment.