Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, P.O Box 80200-Jeddah, 21589, Saudi Arabia.
Geology Department, Faculty of Science, Beni-Suef University, Beni-Suef City, Egypt; Materials Technologies and Their Applications Lab, Geology Department, Faculty of Science, Beni-Suef University, Beni-Suef City, Egypt.
Environ Pollut. 2020 Apr;259:113874. doi: 10.1016/j.envpol.2019.113874. Epub 2020 Jan 2.
Pieces of glass as solid wastes were recycled in the synthesis of highly order MCM-41 that decorated by green fabricated CoO nanoparticles using the green extract of green tea leaves forming novel green nano-composite. The synthetic CoO/MCM-41 exhibit high surface area, low bandgap energy (1.63 eV), and typical spherical morphology decorated by CoO nanoparticles. The composite was evaluated as green photocatalyst in effective oxidation of methyl parathion pesticide in the presence of a visible light source. The degradation results revealed complete removal of 50 mg/L and 100 mg/L after 60 min and 90 min, respectively using 0.25 of the catalyst at pH 8. The detection of the TOC in the treated methyl parathion solution gives strong indications about the formation of organic intermediate compounds during the oxidation steps. The main detected intermediate compound are CHOH(NO), CHOH, (CHO)P(S), CH(OH), CH(OH), CH(NH)OP(O)(OCH), (CHO)P(O)OH, (CH)C(OH)OH(CHO)OC(O), and HOC(CH)C(O)CHO. The detected intermediate compounds converted into SO, PO, NO, and CO under the extensive photocatalytic of them over CoO/MCM-41. The oxidizing species trapping test verified the controlling of the methyl parathion degradation pathway by the hydroxyl radicals. Finally, the composite showed significant reusability properties and applied five times in the oxidation of methyl parathion with considerable degradation percentages.
玻璃碎片作为固体废料被回收，用于合成高度有序的 MCM-41，该材料通过绿茶绿色提取物原位生长 CoO 纳米粒子进行修饰，形成新型绿色纳米复合材料。所合成的 CoO/MCM-41 表现出高比表面积、低带隙能（1.63 eV）和典型的球形形貌，由 CoO 纳米粒子修饰。该复合材料被评估为在可见光照射下有效氧化甲基对硫磷农药的绿色光催化剂。降解结果表明，在 pH 8 下，使用 0.25 份催化剂，分别在 60 min 和 90 min 后，完全去除 50 mg/L 和 100 mg/L 的甲基对硫磷。对处理后的甲基对硫磷溶液中 TOC 的检测强烈表明在氧化步骤中形成了有机中间化合物。主要检测到的中间化合物是 CHOH(NO)、CHOH、(CHO)P(S)、CH(OH)、CH(OH)、CH(NH)OP(O)(OCH)、(CHO)P(O)OH、(CH)C(OH)OH(CHO)OC(O)和 HOC(CH)C(O)CHO。在 CoO/MCM-41 的广泛光催化作用下，这些中间化合物转化为 SO、PO、NO 和 CO。氧化物种捕获试验验证了羟基自由基对甲基对硫磷降解途径的控制。最后，该复合材料表现出显著的可重复使用性能，并在五次甲基对硫磷氧化反应中表现出相当高的降解百分比。
