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Tea waste as adsorbent for ionic dyes

机译：茶渣作为离子染料的吸附剂

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Toxic dyes can be removed from textile effluents and recovered using dead biomass obtained, as waste from the food industry. In this work, tea waste (TW) was employed to assess its adsorptive capacity for the acidic and basic dyes that usually are present in textile industry waste water. Equilibrium and kinetic experiments were performed in batch and column mode. Adsorption equilibrium and fluid solid mass transfer constant data were analyzed through the concept of ion-exchange sorption isotherm. The equilibrium data were fitted with Langmuir and Freundlich models. Several operation variables, such as TW dosage, contact time, initial pH, and temperature, on the removal of dyes were investigated. The removal efficiency increased with increase in TW dosage. The adsorption process followed pseudo-first-order kinetics. Thermodynamic parameters like AH°, AS°, and AG° were analyzed. The processes were spontaneous for the acidic as well as basic dyes. These results suggest that TW is a potential low-cost food industry waste for textile industry waste water treatment. TW was characterized using Scanning electron micrograph and Fourier transform infrared spectroscopy and techniques.
机译：可以从纺织废水中去除有毒染料，并使用死掉的生物质作为食品工业的废料进行回收。在这项工作中，茶废料（TW）用于评估其对纺织工业废水中通常存在的酸性和碱性染料的吸附能力。平衡和动力学实验以间歇和柱模式进行。通过离子交换吸附等温线的概念分析了吸附平衡和流体固体传质常数数据。用Langmuir和Freundlich模型拟合平衡数据。研究了去除染料时的几个操作变量，例如TW剂量，接触时间，初始pH和温度。去除效率随TW剂量的增加而增加。吸附过程遵循拟一级动力学。分析了诸如AH°，AS°和AG°的热力学参数。对于酸性和碱性染料，该过程是自发的。这些结果表明，TW是用于纺织工业废水处理的潜在低成本食品工业废物。用扫描电子显微镜和傅里叶变换红外光谱和技术表征TW。

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