CuO/蒙脱土复合材料可见光催化降解丁基黄药研究

Photocatalytic Degradation of Butyl Xanthate by Cu O/Montmorillonite Composites under Visible Light

采用浸渍—热解法优化制备得到光催化性能优良的CuO/蒙脱土复合材料(CuO/MMT),借助XRD、SEM、TEM、BET、UV-vis及PL光谱等检测手段表征了所制备样品的物相、形貌结构和光化学性能,考察了单一组分及不同CuO负载量的复合材料光催化降解丁基黄药(SBX)的效果,提出了可能的降解反应机理。研究发现,酸活化预处理显著增大了MMT的比表面积,CuO/MMT复合材料中的CuO主要以纳米球状均匀负载于MMT表面,从而提高了所获复合材料对SBX分子的吸附能力;与单一CuO相比,CuO/MMT复合材料对紫外光和可见光的吸收率均显著提高。在可见光照射80min、CuO/MMT复合材料用量0.2g/L的条件下,10%-CuO/MMT复合材料对初始浓度为20mg/L的SBX降解效果最佳,降解率达到99.65%,其中空穴(h+)和超氧自由基(·O_(2)^(-))在该光催化降解过程中发挥了主要作用。研究结果构建了CuO/MMT的新型光催化复合材料,为实现选矿废水中黄药的经济高效处理提供了有益借鉴。

Cu O/montmorillonite(CuO/MMT) composites with excellent photocatalytic performance were optimally prepared by impregnation pyrolysis method. XRD,SEM,TEM,BET,UV vis and PL spectra were used to characterize the phase,morphology,structure and photochemical performance of the prepared samples. The performance of Cu O/MMT composites with single component and different Cu O loading amounts for photocatalytic degradation of butyl xanthate(SBX) was investigated,and the possible mechanism of photocatalytic degradation was proposed. The results showed that the acid activation pretreatment significantly enhanced the specific surface area of MMT,and Cu O in Cu O/MMT composites was uniformly loaded on the surface of MMT in the form of nanospheres,therefore improving the adsorption capacity of the obtained composites to SBX molecules. Compared with single Cu O,the absorption of Cu O/MMT composites to UV and visible light is greatly improved. Under the conditions of 80 min of visible light irradiation and 0. 2 g/L of Cu O/MMT dosage,10%-CuO/MMT composites showed the highest photocatalytic degradation effect to SBX with initial concentration of 20 mg/L,and the degradation rate could reach 99. 65%,in which the holes(h+) and superoxide radicals(·O_(2)^(-)) played a major role in the photocatalytic degradation process. A new type of Cu O/MMT composites used as the photocatalytic materials are constructed,and this work provides a beneficial reference for economic and efficient treatment of xanthates in mineral processing wastewater.