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首页> 美国卫生研究院文献>Materials >A Decolorization Technique with Spent Greek Coffee Grounds as Zero-Cost Adsorbents for Industrial Textile Wastewaters
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A Decolorization Technique with Spent Greek Coffee Grounds as Zero-Cost Adsorbents for Industrial Textile Wastewaters

机译：用过的希腊咖啡渣作为工业纺织品废水的零成本吸附剂的脱色技术

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摘要

In this study, the decolorization of industrial textile wastewaters was studied in batch mode using spent “Greek coffee” grounds (COF) as low-cost adsorbents. In this attempt, there is a cost-saving potential given that there was no further modification of COF (just washed with distilled water to remove dirt and color, then dried in an oven). Furthermore, tests were realized both in synthetic and real textile wastewaters for comparative reasons. The optimum pH of adsorption was acidic (pH = 2) for synthetic effluents, while experiments in free pH (non-adjusted) were carried out for real effluents. Equilibrium data were fitted to the Langmuir, Freundlich and Langmuir-Freundlich (L-F) models. The calculated maximum adsorption capacities (Qmax) for total dye (reactive) removal at 25 °C was 241 mg/g (pH = 2) and 179 mg/g (pH = 10). Thermodynamic parameters were also calculated (ΔH0, ΔG0, ΔS0). Kinetic data were fitted to the pseudo-first, -second and -third order model. The optimum pH for desorption was determined, in line with desorption and reuse analysis. Experiments dealing the increase of mass of adsorbent showed a strong increase in total dye removal.
机译：在这项研究中，以废希腊咖啡渣（COF）作为低成本吸附剂，以分批方式研究了工业纺织废水的脱色。在此尝试中，由于无需进一步修改COF（只需用蒸馏水洗涤以除去污垢和颜色，然后在烤箱中干燥），就可以节省成本。此外，出于比较的原因，在合成废水和实际纺织品废水中均进行了测试。对于合成废水，最佳吸附pH为酸性（pH = 2），而对于实际废水，则在游离pH（未经调整）中进行了实验。平衡数据适用于Langmuir，Freundlich和Langmuir-Freundlich（L-F）模型。在25°C时，所去除的全部染料（反应性）的最大吸附容量（Qmax）为241 mg / g（pH = 2）和179 mg / g（pH = 10）。还计算了热力学参数（ΔH 0 ，ΔG 0 ，ΔS 0 ）。动力学数据拟合到伪一阶，-二阶和-三阶模型。根据解吸和再利用分析，确定了解吸的最佳pH。处理吸附剂质量增加的实验表明，总染料去除量大大增加。

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