ABSTRACT This study was carried out to evaluate the potential application of agricultural waste coconut (Cocos nucifera) fibre in its purified form for decolorization of dye-containing effluent from a down-flow hanging sponge (DHS) reactor. Batch adsorption experiments were conducted by varying adsorbent dose, solution pH, contact time and temperature. The results showed that the adsorption percentage of colour increased with increasing in adsorbent dosage from 0.1 g to 1.3 g, solution pH from 2 to 10 and contact time from 1 h to 72 h. The adsorption process was sensitive to temperature and the adsorption percentage of colour reached the highest value at 30°C but decreased when temperature increased from 30°C to 60°C. Purified coconut fibre (PCF) had a good adsorption capacity under the optimal conditions of an adsorbent dose of 0.7 g, pH 8, temperature of 30°C and 24 h contact time. The equilibrium data were well fitted to both Langmuir and Freundlich isotherms, and the best fit of equilibrium isotherms was described using the Freundlich isotherm model. The Langmuir maximum adsorption capability of the PCF was found to be 303 (Pt/Co)/g at 30°C. The results of this study indicated the applicability of PCF as post-treatment unit of DHS reactor for removal of colour in the industrial dye effluent. GRAPHICAL ABSTRACT

中文翻译：

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下流式悬挂式海绵反应器染料废水流出物中颜色在纯化椰子纤维上的吸附

摘要 本研究旨在评估纯化形式的农业废弃物椰子 (Cocos nucifera) 纤维在下流式悬挂海绵 (DHS) 反应器中对含染料废水进行脱色的潜在应用。通过改变吸附剂剂量、溶液pH、接触时间和温度进行批量吸附实验。结果表明，随着吸附剂用量从 0.1 g 增加到 1.3 g，溶液 pH 从 2 增加到 10，接触时间从 1 h 增加到 72 h，颜色的吸附百分比增加。吸附过程对温度敏感，颜色的吸附百分比在30°C时达到最高值，但随着温度从30°C升高到60°C而下降。纯化椰子纤维（PCF）在吸附剂剂量为0.7 g，pH为8的最佳条件下具有良好的吸附能力，温度为 30°C，接触时间为 24 小时。平衡数据很好地拟合了 Langmuir 和 Freundlich 等温线，并且使用 Freundlich 等温线模型描述了平衡等温线的最佳拟合。发现 PCF 的 Langmuir 最大吸附能力在 30°C 下为 303 (Pt/Co)/g。本研究的结果表明，PCF 作为 DHS 反应器的后处理单元可适用于去除工业染料废水中的颜色。图形概要 本研究的结果表明，PCF 作为 DHS 反应器的后处理单元可适用于去除工业染料废水中的颜色。图形概要 本研究的结果表明，PCF 作为 DHS 反应器的后处理单元可适用于去除工业染料废水中的颜色。图形概要