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首页> 外文期刊>RSC Advances >Enhanced decolorization of aqueous dye solutions by a high quality copolymer flocculant
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Enhanced decolorization of aqueous dye solutions by a high quality copolymer flocculant

机译：高质量的共聚物絮凝剂可增强染料水溶液的脱色

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摘要

A high quality copolymer (CATCS) based on starch and chitosan was synthesized and applied for the enhanced decolorization of aqueous dye solutions. The flocculant was characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. The effects of the initial pH, dosage of CATCS, initial dye concentration, salt concentration and reaction time on the decolorization ability of CATCS were studied. An ultrahigh decolorization efficiency (97.1-99.7%) for the dye solutions was observed for CATCS. It was effective in a wide pH range (2 to 10) and could withstand a high salt concentration. The CATCS flocculant was ten times more efficient than commercial activated carbon in the treatment of real dye wastewater. A decolorization efficiency of 98.3% for the real dye wastewater was reached using 0.34 g L-1 CATCS. The thermodynamics and kinetics of the decolorization process were investigated in detail and the decolorization mechanism with CATCS was determined. The enthalpy change was over 41 kJ mol(-1) for the decolorization process of dye solutions by CATCS. The positive entropy change value for the decolorization corresponded to an increase in the degree of freedom of the adsorbed species. The decolorization process was endothermic and the interaction was controlled with chemisorption.
机译：合成了基于淀粉和壳聚糖的高质量共聚物（CATCS），并将其用于增强染料水溶液的脱色。通过扫描电子显微镜和傅立叶变换红外光谱对絮凝剂进行表征。研究了初始pH值，CATCS用量，染料初始浓度，盐浓度和反应时间对CATCS脱色能力的影响。对于CATCS，染料溶液的脱色效率极高（97.1-97.7％）。在很宽的pH范围（2至10）下有效，并且可以承受高盐浓度。 CATCS絮凝剂在处理实际染料废水方面的效率是商业活性炭的十倍。使用0.34 g L-1 CATCS对实际染料废水的脱色效率达到98.3％。详细研究了脱色过程的热力学和动力学，并确定了CATCS的脱色机理。 CATCS对染料溶液的脱色过程，焓变超过41 kJ mol（-1）。用于脱色的正熵变化值对应于被吸附物质的自由度的增加。脱色过程是吸热的，相互作用是通过化学吸附来控制的。

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