Wee Wei Qing, Sim Lan Ching, Leong Kah Hon, Aziz Azrina Abdul
Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long 9, Bandar Sungai Long, 43000, Kajang, Selangor, Malaysia.
Department of Environmental Engineering, Faculty of Engineering and Green Technology, Universiti Tunku Abdul Rahman, 31900, Kampar, Perak, Malaysia.
Environ Sci Pollut Res Int. 2024 Mar 11. doi: 10.1007/s11356-024-32802-3.
The photocatalytic-adsorption performance of the composites of volborthite (CuVA) and graphitic carbon nitride (g-CN) was studied in this work using oxytetracycline (OTC) as model pollutant under LED light irradiation. CuVA at different weight percentages (10, 30, 50), namely, C10, C30, and C50, were loaded onto graphitic carbon nitride using wet chemical method. The physical, chemical, and optical properties were evaluated via various analytical techniques. Through integrated adsorption-photocatalytic process, no significant photocatalytic reaction occurred in g-CN and the composite even after 4 h of irradiation. The setup was modified such that each run was conducted in the presence and absence of light. Aside from photolysis and g-CN, all composites performed better under the presence of light in which CuVA improved the most from ~ 50% down to ~ 20% of initial concentration. CuVA performed almost identically (80% removal of OTC) under the presence of light irradiation at ambient temperature (22 °C) and in the dark at 32 °C, confirming that temperature was the contributing factor to the improvement instead of light. CuVA exhibited excellent adsorption capacity of 171 mg/g and adsorption rate of 90% towards the removal of highly concentrated OTC (100 mg/L) under optimized parameters of pH 5.0 and at 42 °C after 3 h of adsorption process. Life cycle assessment revealed that close to 50% of fresh 100 ppm OTC could be removed after five cycles without any desorption process.
本研究以土硫锑铜矿（CuVA）与石墨相氮化碳（g-CN）的复合材料为对象，以土霉素（OTC）作为模型污染物，在LED光照射下研究其光催化吸附性能。采用湿化学法将不同重量百分比（10%、30%、50%）的CuVA，即C10、C30和C50，负载到石墨相氮化碳上。通过各种分析技术对其物理、化学和光学性质进行了评估。通过集成吸附-光催化过程，即使在照射4小时后，g-CN和复合材料中也未发生明显的光催化反应。对实验装置进行了改进，使每次实验都在有光和无光的条件下进行。除了光解和g-CN外，所有复合材料在有光条件下表现更好，其中CuVA的性能提升最为显著，初始浓度从约50%降至约20%。在环境温度（22°C）下光照和32°C黑暗条件下，CuVA对OTC的去除效果几乎相同（80%），这证实温度是去除效果提升的因素，而非光照。在pH 5.0和42°C的优化参数下，经过3小时的吸附过程，CuVA对高浓度OTC（100 mg/L）的去除表现出171 mg/g的优异吸附容量和90%的吸附率。生命周期评估表明，在五个循环后，接近50%的新鲜100 ppm OTC可以在不进行任何解吸过程的情况下被去除。
