纳米Fe-g-C₃N₄的制备及其光催化降解Cr(VI)的性能研究

Preparation of Nano-Fe-g-C₃N₄ and Its Photocatalytic Degradation of Cr(VI)

摘要: 随着工业的发展，大量的工厂将含铬Cr(VI)废水排放至河流湖泊中，使得水体污染愈加严重，生态问题日益严峻，环境污染问题也越来越引起人们的注意。因Fe-g-C₃N₄材料具有制备工艺简单、原始材料成本低、绿色环保、降解性能较好等优点，在光催化领域值得我们研究。本论文通过元素掺杂和形貌调控的手段对CN的组成和结构进行了改良，主要探究Fe-g-C₃N₄对模拟工业污水中重金属离子Cr(VI)的降解，并对光催化的部分规律通过控制变量法逐个探究和总结。研究结果表明，将原料三聚氰胺换为尿素可有效的降低合成光催化剂的成本；(a/b/c)Fe-g-C₃N₄对光催化性能的影响中，实验中m_Fe = 2 g时，降解效果较好；在不同pH实验中，pH = 3时，降解效果较好；在等体积的拟废水溶液中，并不是光催化剂添加的越多，光催化性能越好。虽然降解程度相近，m = 1.5 g时降解效果较好。

Abstract: With the development of industry, a large number of factories discharge chromium-containing Cr(VI) wastewater into rivers and lakes, which makes water pollution more and more serious, ecological problems are increasingly severe, and environmental pollution problems have attracted more and more attention. Fe-g-C₃N₄ material has the advantages of simple preparation process, low cost of raw material, green environmental protection and good degradation performance, so it is worthy of our research in the field of photocatalysis. In this paper, the composition and structure of CN are improved by means of element doping and morphology regulation, and the degradation of Cr(VI) in simulated industrial wastewater by Fe-g-C₃N₄ is mainly investigated, and some laws of photocatalysis are investigated and summarized one by one by control variable method. The results show that the cost of synthetic photocatalyst can be reduced effectively by changing the raw material melamine to urea. As for the effect of (a/b/c)Fe-g-C₃N₄ on photocatalytic performance, the degradation effect is better when m_Fe = 2 g in the experiment; in different pH experiments, when pH = 3, the degradation effect is better; In the same volume of pseudo-wastewater solution, it is not the more photocatalyst added, the better the photocatalytic performance. Although the degradation degree is similar, the degradation effect is better when m = 1.5 g.