凹凸棒黏土-C3N4复合光催化剂的制备及其条件优化

摘要：以酸化改性凹凸棒黏土（凹凸棒黏土先进行酸化，再用KH560改性）为载体，分别选用三聚氰胺和二氰二胺为氮源，通过原位沉积法将氮化碳负载于改后的凹凸棒黏土表面。为了获得性能最佳的复合催化剂，调节氮源与凹土的比例分别为：m(kh560-ATT) :m(三聚氰胺) = 1:1 、1:2 、1:3 （产物记为S（1：1）、S（1：2）、（1：3））；m(kh560-ATT) :m(二氰二胺) =1:1 、1:2 、1:3（产物记为E（1：1）、E（1：2）（1：3）。采用XRD、BET、SEM、FT-IR、UV-vis等分析技术对产品进行表征，实验结果表明，两种氮源改性凹凸棒黏土的产物结构相似，均可实现C3N4的高效负载。以光催化剂降解甲基橙为探针考查了复合催化剂的性能，发现氮源与凹土比例不同，催化性能按（1：1）>（1：2）>（1：3）顺序递减；氮源与凹土比例相同（1：1）的情况下，以二氰二胺为氮源性能较好，当m(kh560-ATT) :m(二氰二胺) = 1:1时，复合光催化剂性能最佳， 210min内对10mg/L的甲基橙溶液降解率达到了80%。79680

毕业论文关键词：C3N4，凹凸棒黏土，三聚氰胺，二氰二胺，光催化

Abstract：g-C3N4 was loaded on the surface of the modified Attapulgite via an in-situ deposition method using melamine and dicyanodiamide as the nitrogen source，in which the Attapulgite was acidulated first and then modified by silylated KH560。 In order to obtain the highest performance composite photocatalyst, the proportion of nitrogen source and modified Attapulgite (m(kh560-ATT) :m(melamine)) was adjusted to 1:1 、1:2 、1:3 and the products were marked as S(1:1)、 S(1:2)、 S(1:3)。 Similarly, m(kh560-ATT) :m(dicyanodiamide) was adjusted to 1:1 、1:2 、1:3（products were marked as E（1:1）、E（1:2）、E（1:3））。 The structure of the photocatalyst was characterized by X-Ray diffraction (XRD), BET surface area, Scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FT-IR) and Ultraviolet visible absorption(UV-Vis) methods。 Results show that, the products with similar structure were synthesized via the composite between acidulated and silylated Attapulgite and two different nitrogen source which all make high efficient load of g-C3N4。 The composite catalyst were evaluated by photocatalyst degradation of methyl orange as the modle system。 It was found that with the different mass ratio of Attapulgite and nitrogen source, the photocatalytic performance decreased progressively following to （1：1）>（1：2）>（1：3）;the performance of the composite with dicyanodiamide as the nitrogen source was higher than melamine when mass ratio was 1:1 and photocatalytic degradation rate of 10mg/l methyl orange can reach 80% in 210 minutes．

Key words：C3N4、Attapulgite clay、melamine、diayanodiamine、photochemical catalysis

1 绪论 1

2 实验部分 2

2。1 复合光催化剂的制备 2

2。2 复合光催化剂的表征 3

2。3 复合光催化剂的光催化性能 3

3 结果与讨论 3

3。1 催化剂的表征 3

3。1。1 XRD图像数据分析 3

3。1。2 SEM图像数据分析 5

3。1。3 BET比表面积数据分析 6

3。1。4 红外光谱数据分析 7

3。1。5 紫外可见光复合光催化剂性能数据分析凹凸棒黏土-C3N4复合光催化剂的制备及其条件优化:http://www.youerw.com/huaxue/lunwen_92244.html