Thambiliyagodage Charitha, Usgodaarachchi Leshan, Jayanetti Madara, Liyanaarachchi Chamika, Kandanapitiye Murthi, Vigneswaran Saravanamuthu
Faculty of Humanities and Sciences, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka.
Department of Materials Engineering, Faculty of Engineering, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka.
ACS Omega. 2022 Jul 15;7(29):25403-25421. doi: 10.1021/acsomega.2c02336. eCollection 2022 Jul 26.
Dyes in wastewater are a serious problem that needs to be resolved. Adsorption coupled photocatalysis is an innovative technique used to remove dyes from contaminated water. Novel composites of TiO-FeC-Fe-FeO dispersed on graphitic carbon were fabricated using natural ilmenite sand as the source of iron and titanium, and sucrose as the carbon source, which were available at no cost. Synthesized composites were characterized by X-ray diffractometry (XRD), Raman spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence spectroscopy (XRF), and diffuse reflectance UV-visible spectroscopy (DRS). Arrangement of nanoribbons of graphitic carbon with respect to the nanomaterials was observed in TEM images, revealing the occurrence of catalytic graphitization. Variations in the intensity ratio ( / ), and , calculated from data obtained from Raman spectroscopy suggested that the level of graphitization increased with an increased loading of the catalysts. SEM images show the immobilization of nanoplate microballs and nanoparticles on the graphitic carbon matrix. The catalyst surface consists of Fe and Ti as the metal species, with V, Mn, and Zr being the main impurities. According to DRS spectra, the synthesized composites absorb light in the visible region efficiently. Fabricated composites effectively adsorb methylene blue via π-π interactions, with the absorption capacities ranging from 21.18 to 45.87 mg/g. They were effective in photodegrading methylene blue under sunlight, where the rate constants varied in the 0.003-0.007 min range. Photogenerated electrons produced by photocatalysts captured by graphitic carbon produce O radicals, while holes generate OH radicals, which effectively degrade methylene blue molecules. TiO-FeC-Fe-FeO/graphitic carbon composites inhibited the growth of (69%) and (92%) under visible light. Synthesized novel composites using natural materials comprise an ecofriendly, cost-effective solution to remove dyes, and they were effective in inhibiting the growth of Gram-negative and Gram-positive bacteria.
废水中的染料是一个亟待解决的严重问题。吸附耦合光催化是一种用于从受污染水中去除染料的创新技术。以天然钛铁矿砂为铁和钛的来源，蔗糖为碳源，制备了分散在石墨碳上的新型TiO-FeC-Fe-FeO复合材料，这些原料成本低廉。通过X射线衍射仪（XRD）、拉曼光谱、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、X射线荧光光谱（XRF）和漫反射紫外可见光谱（DRS）对合成的复合材料进行了表征。在TEM图像中观察到石墨碳纳米带相对于纳米材料的排列，揭示了催化石墨化的发生。根据拉曼光谱数据计算得到的强度比（/）、和的变化表明，随着催化剂负载量的增加，石墨化程度提高。SEM图像显示纳米板微球和纳米颗粒固定在石墨碳基质上。催化剂表面以Fe和Ti作为金属物种，V、Mn和Zr为主要杂质。根据DRS光谱，合成的复合材料在可见光区域有高效的光吸收。制备的复合材料通过π-π相互作用有效吸附亚甲基蓝，吸附容量在21.18至45.87 mg/g之间。它们在阳光下能有效光降解亚甲基蓝，速率常数在0.003 - 0.007 min范围内变化。光催化剂产生的光生电子被石墨碳捕获产生O自由基，而空穴产生OH自由基，从而有效降解亚甲基蓝分子。TiO-FeC-Fe-FeO/石墨碳复合材料在可见光下抑制了（69%）和（92%）的生长。使用天然材料合成的新型复合材料是一种环保、经济高效的染料去除解决方案，并且在抑制革兰氏阴性菌和革兰氏阳性菌生长方面有效。
