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首页> 外文期刊>Arabian Journal for Science and Engineering >Removal of Heavy Metals from Waste Water Using Black Teawaste
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Removal of Heavy Metals from Waste Water Using Black Teawaste

机译：使用黑茶渣去除废水中的重金属

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摘要

Removal of heavy metals (Cobalt, Cadmium, and Zinc) from waste water was possible using black teawaste. Adsorption was observed for the three metals at 180 min. Under our experimental conditions, pH plays an important role in the adsorption process, particularly on the adsorption capacity of teawaste for the heavy metals under study. The pH level allowing for an optimum rate of adsorption was found to be 6 for Co, Cd, and Zn. We demonstrate that black teawaste has a relatively high adsorption capacity for these heavy metals; the quantities adsorbed per a half gram of black teawaste at equilibrium (q_e) are 15.39 mg/g for Co, 13.77 mg/g for Cd, and 12.24 mg/g for Zn. It was found that the percentage of removed metal ions is inversely proportional to initial metal ions concentration, but correlates with teawaste adsorbent dosage. The adsorption of heavy metals on black teawaste is described by an isotherm of type I and is fully verified by the Freundlich and Langmuir isotherms. The kinetics of the Cobalt, Cadmium, and Zinc adsorption on the teawaste were found to follow a pseudo first-order rate equation. This method has the advantage of being applicable in developing countries due to the low cost and availability of teawaste.
机译：使用黑茶渣可以去除废水中的重金属（钴，镉和锌）。在180分钟时观察到三种金属的吸附。在我们的实验条件下，pH在吸附过程中起着重要作用，特别是在茶废料对重金属的吸附能力方面。发现Co，Cd和Zn的最佳吸附速率的pH值为6。我们证明了黑茶渣对这些重金属具有相对较高的吸附能力。平衡状态下每半克黑茶废物的吸附量（q_e）对于Co为15.39 mg / g，对于Cd为13.77 mg / g，对于Zn为12.24 mg / g。发现去除的金属离子的百分比与初始金属离子浓度成反比，但与茶渣吸附剂剂量相关。 I型等温线描述了黑茶渣上重金属的吸附，Freundlich和Langmuir等温线充分证实了这种吸附。发现钴，镉和锌在茶渣上的吸附动力学遵循伪一级速率方程。该方法的优点是成本低廉，可得到的废茶可用于发展中国家。

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