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Photocatalytic degradation of methyl orange by chitosan/CdS nanoparticle composite films

机译：壳聚糖/ CdS纳米粒子复合膜光催化降解甲基橙

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Cadmium sulfide (CdS) nanoparticles were synthesized in situ in the presence of chitosan hydrogel films. The resulting chitosan/CdS nanoparticle composite films were characterized by Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The photocatalytic reactivity of the chitosan/CdS nanoparticle composite films was evaluated using methyl orange (MO) as a model pollutant. The influence of various parameters towards MO degradation was investigated including the amount of the catalyst, initial MO concentration, pH and the catalytic cycles. The decolorization efficiency was 90% in this study, and after four times reuse, the efficiency still remained high at 78.2%. The study demonstrated that the crosslinked chitosan hydrogel films provided a confined matrix for the growth of CdS nanoparticles and the coordination of Cd2+ with -NH2 groups in C-2 and -OH groups in C-3 of the chitosan chain likely occurred. The photocatalytic decolorization of MO was found to follow a pseudo-first-order kinetics according to the Langmuir-Hinshelwood (L-H) model. The UV-vis spectroscopy study indicated that the aromatic rings (with a peak at 270.0 nm) and azo bonds (with a peak at 463.0 nm) of MO were broken under the UV light irradiation in the presence of the chitosan/CdS nanoparticle composite film.
机译：在壳聚糖水凝胶膜的存在下原位合成了硫化镉（CdS）纳米颗粒。所得的壳聚糖/ CdS纳米颗粒复合膜通过傅立叶变换红外光谱（FTIR）和透射电子显微镜（TEM）表征。使用甲基橙（MO）作为模型污染物评估了壳聚糖/ CdS纳米颗粒复合膜的光催化反应性。研究了各种参数对MO降解的影响，包括催化剂的量，初始MO浓度，pH和催化循环。在本研究中，脱色效率为90％，在重复使用四次后，效率仍然保持在78.2％的较高水平。研究表明，交联的壳聚糖水凝胶薄膜为CdS纳米粒子的生长提供了受限的基质，并且可能发生Cd2 +与壳聚糖链的C-2中的-NH2基团和C-3中的-OH基团配位。根据Langmuir-Hinshelwood（L-H）模型，发现MO的光催化脱色遵循伪一级动力学。紫外-可见光谱研究表明，在壳聚糖/ CdS纳米粒子复合膜存在下，紫外光照射下MO的芳环（在270.0 nm处具有峰）和偶氮键（在463.0 nm处具有峰）被破坏。 。

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