Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, 624 302 Dindigul, Tamil Nadu, India; Department of Chemistry, Pocker Sahib Memorial Orphanage College, Tirurangadi, 676306 Malappuram, Kerala, India.
Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, 624 302 Dindigul, Tamil Nadu, India.
Int J Biol Macromol. 2019 Jul 15;133:253-261. doi: 10.1016/j.ijbiomac.2019.04.073. Epub 2019 Apr 12.
Integrated photocatalytic composite adsorbents (IPCA) are used to degrade toxic organic and inorganic compounds in presence of UV/visible light irradiation. The compound preserves all the existing features of individual components and at the same time overcome drawbacks like rapid recombination of photogenerated electrons, low absorptivity and hindrance effect of the photocatalyst. Herein, an integrated Photocatalytic Chitosan-La-Graphite composite adsorbent was synthesized and the resultant composites were characterized by FTIR, XRD, TGA, EDX and SEM analysis. The UV-visible diffusion reflectance spectroscopy (UV-vis DRS) was used for the band gap measurement and it was found to be 3.2 eV. An aqueous solution of methylene blue (MB) dye (30 mL of 100 mg/L) was used to study the photocatalytic efficiency of the prepared IPCA. The Chitosan-La-Graphite Composite (CS-La-GR) (100 mg of dosage) exhibits enhanced photocatalytic degradation efficiency (93.5% in 40 min) for Methylene blue under UV light irradiation. The highest photodegradation was due to the stronger adsorption of MB dye on the surface of highly porous IPCA. Moreover, the reactive species, OH radical and O radical ions play a major role in the photocatalytic degradation of Methylene blue over composite photocatalyst.
光催化复合吸附剂 (IPCA) 用于在紫外/可见光照射下降解有毒的有机和无机化合物。该化合物保留了各个组分的所有现有特性，同时克服了光生电子快速复合、吸收率低和光催化剂的阻碍效应等缺点。本文合成了一种集成光催化壳聚糖-镧-石墨复合吸附剂，并通过傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD)、热重分析 (TGA)、能谱 (EDX) 和扫描电子显微镜 (SEM) 对所得复合材料进行了表征。使用紫外-可见漫反射光谱 (UV-vis DRS) 进行带隙测量，发现带隙为 3.2 eV。使用亚甲基蓝 (MB) 染料的水溶液 (30 mL，浓度为 100 mg/L) 研究了制备的 IPCA 的光催化效率。壳聚糖-镧-石墨复合材料 (CS-La-GR)（100 mg 剂量）在紫外光照射下对亚甲基蓝表现出增强的光催化降解效率（40 分钟内降解 93.5%）。最高的光降解归因于 MB 染料在高多孔 IPCA 表面的更强吸附。此外，在复合光催化剂上，OH 自由基和 O 自由基在亚甲基蓝的光催化降解中起主要作用。
