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首页> 外文期刊>Journal of King Saud University >Investigations on amidoxime grafted sepiolite based chitosan organic–inorganic nanohybrid composite beads towards wastewater detoxification
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Investigations on amidoxime grafted sepiolite based chitosan organic–inorganic nanohybrid composite beads towards wastewater detoxification

机译：基于脒肟的壳聚糖壳聚糖有机 - 无机纳米组合珠朝向废水排毒的研究

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This work explores the fabrication of organic–inorganic nanohybrid based biopolymer composite systems for the cleaning of different contaminants from wastewater. This system involves the simultaneous radiation grafting techniques for sepiolite (SP) modification and the simple mixing of modified-SP with biopolymer matrix, chitosan (CS). The SP beads were chemically modified with amidoxime prior to its use in composite systems. The synthesized composite beads were characterized using scanning electron microscopy (SEM), thermal gravimetric analysis (TGA), nitrogen physical adsorption (BET) investigations, Fourier transform infrared (FT-IR), atomic absorption and UV–visible spectroscopy. Hydrolytic stability of beads was also investigated in aqueous media, beads showed excellent stability in aqueous medium and in acidic environment. Here, the sorption profile of copper over amidoxime grafted SP-nanohybrid (MSP) incorporating CS-beads is reported. Furthermore, the key adsorptive variables, i.e. contact time, adsorbent dose, and concentration of adsorbate are discussed. Different isothermal (Langmuir and Freundlich) and kinetics model were also elaborated. Langmuir isotherm and pseudo-second-order models are proved to be the best fit models for Cu (II) removal in aqueous system. To explore the efficacy of the material towards organic pollutants, methylene blue (MB) was selected as model compound and adsorbed on nanohybrid beads. The results revealed that organic–inorganic nanohybrid incorporating CS beads are quite effective for contaminated water remediation, owing to their better adsorptive performance, high stability and easy application.
机译：该工作探讨了用于从废水中清洁不同污染物的基于有机无机纳米生物聚合物复合体系的制备。该系统涉及用于Sepiolite（SP）改性的同时放射移植技术和改性-SP与生物聚合物基质的简单混合，壳聚糖（CS）。在其在复合系统中使用之前，将SP珠子用偕胺肟进行化学改性。使用扫描电子显微镜（SEM），热重分析（TGA），氮气体吸附（BET）研究，傅里叶变换红外（FT-IR），原子吸收和UV可见光光谱，其特征在于合成的复合珠。还在水性介质中研究了珠粒的水解稳定性，珠粒在含水介质和酸性环境中显示出优异的稳定性。这里，报道了掺入CS-珠的偕胺肟接枝的SP纳米油（MSP）上的铜的吸附谱。此外，讨论了键吸附变量，即接触时间，吸附剂剂量和吸附物浓度。还阐述了不同的等温（Langmuir和Freundlich）和动力学模型。 Langmuir等温线和伪二阶模型被证明是铜（II）在水系统中去除的最佳拟合模型。为了探讨材料对有机污染物的功效，选择亚甲基蓝（MB）作为模型化合物并吸附在纳米嗜型珠粒上。结果表明，由于其更好的吸附性能，高稳定性和易于应用，有机 - 无机纳米含有Cs珠子的纳米嗜珠非常有效。

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