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首页> 外文期刊>International Journal of Environment and Bioenergy >Dye Removal from Aqueous Solution Using Coconut Coir Dust Extract-modified Polyvinyl alcohol: A Novel Adsorbent
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Dye Removal from Aqueous Solution Using Coconut Coir Dust Extract-modified Polyvinyl alcohol: A Novel Adsorbent

机译：使用椰壳粉尘提取物改性聚乙烯醇从水溶液中去除染料：新型吸附剂

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Coconut coir dust contains a large proportion of lignin and cellulosic groups which act as potential pollutants absorber in effluents. This study investigated the crosslinking of polyvinyl alcohol having one –OH group on its molecule with coconut coir dust in order to introduce functions to the polymer and increase its hydrophilicity by physical means. The application of the adsorbent to remove cationic dye malachite green from effluent was very feasibly. Adsorption was studied as a function of solution pH, contact time and initial dye concentration. Adsorption data were analysed using various isotherms models and was found to conform to the principle of Lagmuir, Freundlich and FloryHuggins models with good correlation coefficients (R~2 > 0.95). The kinetics was also studied to elucidate the mechanistic pathway of the process. Results revealed that pseudo second order kinetic model provided better fit than the pseudo-first order in terms of adsorption capacity of the sorbent. Changes in Gibb's free energy (ΔG) as calculated from Langmuir and Flory-Huggins isotherms are +3.033 and +14.634 respectively indicating a non-spontaneous process at the temperature of study. Based on this report, coconut coir dust could be used to functionalize low molecular weight polymers for its applications in wastewater treatment.
机译：椰子椰壳粉尘含有大量的木质素和纤维素基团，它们是废水中潜在的污染物吸收剂。这项研究研究了在分子上具有一个-OH基团的聚乙烯醇与椰壳粉尘的交联，以便通过物理手段将聚合物引入功能并增加其亲水性。应用吸附剂从废水中去除阳离子染料孔雀石绿非常可行。研究了吸附随溶液pH，接触时间和初始染料浓度的变化。使用各种等温线模型分析吸附数据，发现其符合Lagmuir，Freundlich和FloryHuggins模型的原理，具有良好的相关系数（R〜2> 0.95）。还研究了动力学，以阐明该过程的机械途径。结果表明，在吸附剂的吸附能力方面，拟二级动力学模型比拟一级动力学模型更好。根据Langmuir和Flory-Huggins等温线计算的吉布自由能（ΔG）的变化分别为+3.033和+14.634，表明在研究温度下是非自发过程。根据此报告，椰壳粉尘可用于功能化低分子量聚合物，以用于废水处理。

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