基于MOF制备铜碳复合材料及其对甲基橙的降解

Preparation of copper-carbon composites based on MOF and its degradation for methyl orange

摘要:

摘要:以对苯二甲酸和三水硝酸铜为原料，采用溶剂热法合成金属骨架材料Cu-MOF，以其作为前驱体，在氮气氛围下经过不同温度焙烧化得到了铜碳复合材料Cu-MOF-T(T=700℃、800℃、900℃、1000℃ )。通过XPS、 SEM和BET分析了Cu-MOF-T的微观结构和形貌；考察了Cu-MOF-T样品作为类芬顿非均相催化剂催化降解甲基橙（MO）模拟废水的特性，通过优化pH、初始MO质量浓度、循环性，探索了催化剂Cu-MOF-800的适用性。结果表明：Cu-MOF-T样品为以Cu、C、O为主的多孔片层状结构，尺寸（10～1 μm）焙烧温度升高而减小，其中Cu-MOF-800具有最大的表面积、孔体积和Cu+/Cu2+；在H2O2浓度10 mmol/L、催化剂质量浓度1 g/L、反应温度50 ℃,溶液 pH=3、MO质量浓度200 mg/L的条件下，Cu-MOF-800对甲基橙降解效率最好,经过60 min的反应，甲基橙的降解率能达到99%以上;在经过5次循环使用后,Cu-MOF-800的降解效率仍然保持在96%以上。

Abstract:

Abstract: Metal-organic framework material, Cu-MOF was synthesized by solvent-thermal method from terephthalic acid and copper nitrate hydrate, and then roasted at different temperaturein nitrogen to obtain copper-carbon composites, Cu-MOF-T (T=700 ℃, 800 ℃, 900 ℃, 1000 ℃). The materials were characterized by XPS, SEM and BET. The catalytic degradation performances of methyl orange (MO) simulated wastewater by Cu-MOF-T samples as Fenton like heterogeneous catalysts were investigated. The effects of initial pH, initial mass concentration of MO, and the stability of catalyst were optimized to explore the application of Cu-MOF-800. The results showed that Cu-MOF-T samples exhibited a porous lamellar structure with Cu, C, and O as the main components. The size (10～1μm) of Cu-MOF-T decreased with the increase of roasting temperature. Among these samples, Cu-MOF-800 had the maximum specific surface area, pore volumes and Cu+/Cu2+. Under the conditions of molar concentration of H2O2 10 mmol/L, mass concentration of catalyst 1 g/L, reaction temperature 50℃, pH value of solution 3, and mass concentration of MO 200 mg/, Cu-MOF-800 showed the best performance for the degradation of MO solution, and after 60 min of reaction, the degradation rate of MO could reach up to 99%. The degradation rate of Cu-MOF-800 for MO was still over 96% even after being for 5 cycles.