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首页> 外文期刊>RSC Advances >Effective adsorption of cationic dyes by lignin sulfonate polymer based on simple emulsion polymerization: isotherm and kinetic studies
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Effective adsorption of cationic dyes by lignin sulfonate polymer based on simple emulsion polymerization: isotherm and kinetic studies

机译：基于简单乳液聚合的木质素磺酸盐聚合物对阳离子染料的有效吸附：等温线和动力学研究

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This study describes the synthesis of a lignin sulfonate polymer based on a simple emulsion polymerization from lignin sulfonates derived from the accessible by-products of paper pulp and the adsorption properties of the lignin sulfonate polymer towards dyes. Fourier transform infrared spectroscopy (FT-IR) was employed to characterize the successful synthesis of the lignin sulfonate polymer. The lignin sulfonate polymer presents selective adsorption of cationic dyes in aqueous solution, with a percentage adsorption of malachite green exceeding 95% at pH 7. The effects of pH, sorbent amount, initial malachite green concentration and temperature on the adsorption properties have been discussed. 4 kinetic models and 3 isotherm models were employed to evaluate the experimental data. The results indicated that the adsorption kinetics data fit a pseudo second-order kinetic model and the Langmuir adsorption isotherm was applicable for the adsorption of malachite green onto the lignin sulfonate polymer. Furthermore, the thermodynamic analysis (the values of Delta G(0) are negative and between -20 and 0 kJ mol(-1), the values of Delta H-0 and Delta S-0 are positive) demonstrates that the adsorption process of malachite green onto the lignin sulfonate polymer is endothermic, spontaneous and random. The results suggest that the lignin sulfonate polymer is a low-cost, alternative sorbent and has the potential to reduce the refractory chemical oxygen demand (COD) in effluents.
机译：这项研究描述了基于木质素磺酸盐的简单乳液聚合合成木质素磺酸盐聚合物的方法，木质素磺酸盐得自纸浆易得的副产物，以及木质素磺酸盐聚合物对染料的吸附特性。傅里叶变换红外光谱（FT-IR）用于表征木质素磺酸盐聚合物的成功合成。木质素磺酸盐聚合物表现出对阳离子染料在水溶液中的选择性吸附，在pH值为7时孔雀石绿的吸附百分比超过95％。已讨论了pH，吸附剂量，初始孔雀石绿浓度和温度对吸附性能的影响。使用4个动力学模型和3个等温线模型来评估实验数据。结果表明，吸附动力学数据符合拟二级动力学模型，Langmuir吸附等温线适用于孔雀石绿在木质素磺酸盐聚合物上的吸附。此外，热力学分析（Delta G（0）的值为负，并且在-20和0 kJ mol（-1）之间，Delta H-0和Delta S-0的值为正）表明，吸附过程为木质素磺酸盐聚合物上的孔雀石绿是吸热的，自发的和无规的。结果表明，木质素磺酸盐聚合物是一种低成本的替代吸附剂，具有降低废水中难处理化学需氧量（COD）的潜力。

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