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首页> 外文期刊>ACS Omega >Preparation of Chitosan Poly(methacrylate) Composites for Adsorption of Bromocresol Green
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Preparation of Chitosan Poly(methacrylate) Composites for Adsorption of Bromocresol Green

机译：壳聚糖聚甲基丙烯酸甲酯复合材料对溴甲酚绿的吸附性能

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摘要

In the present study, chitosan poly(methacrylate) composites were prepared and applied for adsorption of bromocresol green from aqueous solutions. The synthesized composites were characterized with scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The bromocresol green removal by the developed adsorbent was investigated, and the effects of experimental parameters, including sample pH and adsorption time, were also examined. Furthermore, the adsorption characteristics of the synthesized adsorbent, including kinetics, adsorption isotherms, and thermodynamics, were comprehensively studied. The adsorption isotherm was well described by the Freundlich model, and the maximum adsorption capacity was 39.84 μg mg–1 by shaking for 40 min at pH 2.0. Bromocresol green adsorption kinetics followed a pseudo-second-order kinetic model, indicating that adsorption was the rate-limiting step. Thermodynamic parameters and the negative values of Gibbs free energy change (ΔG°) showed that adsorption was a spontaneous process. The positive values of entropy change (ΔS°) implied that the adsorption of bromocresol green on chitosan poly(methacrylate) composites was an increasing random process. In addition, enthalpy change (ΔH°) values were positive, suggesting that the adsorption of bromocresol green was endothermic. The adsorption percentage of bromocresol green with chitosan poly(methacrylate) composites remained above 97% after three times of recycling test.
机译：在本研究中，制备了壳聚糖聚（甲基丙烯酸酯）复合材料，并用于从水溶液中吸附溴甲酚绿。通过扫描电子显微镜，傅立叶变换红外光谱和热重分析对合成的复合材料进行表征。研究了已开发的吸附剂对溴甲酚绿的去除，还考察了实验参数（包括样品的pH值和吸附时间）的影响。此外，对合成的吸附剂的吸附特性，包括动力学，吸附等温线和热力学进行了全面研究。 Freundlich模型很好地描述了吸附等温线，在pH 2.0下摇动40分钟，最大吸附容量为39.84μgmg-1。溴甲酚绿的吸附动力学遵循伪二级动力学模型，表明吸附是限速步骤。热力学参数和吉布斯自由能变化的负值（ΔG°）表明吸附是自发过程。熵变的正值（ΔS°）表示，溴甲酚绿在壳聚糖聚（甲基丙烯酸酯）复合材料上的吸附是一个不断增加的随机过程。另外，焓变（ΔH°）值为正，表明溴甲酚绿的吸附是吸热的。经过3次循环测试，壳聚糖聚甲基丙烯酸甲酯复合材料对溴甲酚绿的吸附率保持在97％以上。

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