Fe掺杂g-C_(3)N_(4)催化剂的制备及其光催化-芬顿降解罗丹明B  

Preparation of Fe-doped g-C_(3)N_(4)catalyst and its photo-Fenton degradation property for RhB under visible light

作　　者：毛爱荣 宋瑞雪[2] 贺彬艳 蒋仲豪 刘海燕 白妮[4] 王爱民[4] 白锦军[4] MAO Airong;SONG Ruixue;HE Binyan;JIANG Zhonghao;LIU Haiyan;BAI Ni;WANG Aimin;BAI Jinjun(Shenmu Dongfeng Metal Magnesium Co.Ltd.,Shenmu 719319,China;Xi′an Research Institute of Chinese Lacquer,Xi′an 712000,China;Ningxia Zhongke Carbon-based Material Industry Technology Research Institute,Shizuishan 753000,China;School of Chemistry and Chemical Engineering,Yulin University,Yulin 719000,China)

机构地区：[1]神木市东风金属镁有限公司,陕西神木719319 [2]西安生漆涂料研究所,陕西西安712000 [3]宁夏中科碳基材料产业技术研究院,宁夏石嘴山753000 [4]榆林学院化学与化工学院,陕西榆林719000

出　　处：《化工科技》2025年第1期48-53,共6页Science & Technology in Chemical Industry

基　　金：陕西省科技创新团队计划项目(2023-CX-TD-39);宁夏回族自治区自然科学基金项目(2023AAC03888)。

摘　　要：通过尿素溶液高温热缩聚法合成石墨相氮化碳,将其与硫酸铁混合高温焙烧制备Fe掺杂氮化碳(CN)催化剂(xFe/CN)。利用XRD、FTIR、SEM和UV-Vis DRS等对催化剂进行表征,并在可见光下对罗丹明B(RhB)分别进行光催化和光催化-芬顿降解实验。结果表明,Fe掺杂破坏CN的晶体结构和电子能带结构,较小地提高CN的禁带宽度,降低了其对可见光的吸收能力,但使CN的表面变得疏松多孔。在光催化反应中,光照180 min,1%Fe/CN对RhB降解率由原CN的26.4%提高至63.1%,速率常数约为CN的4.5倍。较小H_(2)O_(2)浓度也能使1%Fe/CN有较好的光催化-芬顿反应性能,c(H_(2)O_(2))=0.02 mol/L,光照180 min,RhB降解率为98.4%。在上述2个反应体系中,h^(+)起主要作用,·O_(2)^(-)次之,最后为·OH。1%Fe/CN具有良好的循环使用性能,经过3次光催化-芬顿循环实验,反应活性下降约14.9%。The synthesis of g-C_(3)N_(4)(CN)was accomplished through the high-temperature thermal polymerisation method of an aqueous urea solution.Fe-doped CN catalysts(x Fe/CN)were fabricated by blending CN with iron sulphate through high-temperature roasting.The catalysts were characterised by XRD,FTIR,SEM and UV-Vis DRS,and photo and photo-Fenton degradation experiments were carried out on Rhodamine B(RhB)under visible light.The results demonstrated that the introduction of iron into the structure of CN led to a disruption of the crystal structure and electronic energy band configuration of CN.It was accompanied by a slight increase in the width of the energy band,a reduction in the absorbance ability to visible light of CN,and at the same time,caused the surface of CN to become looser and more porous.In the photocatalytic reaction,the degradation rate of RhB over 1%Fe/CN increased from 26.4%of CN to 63.1%after 180 min of under visible light,with a rate constant approximately 4.5 times that of CN.Low levels of H_(2)O_(2)could also result in an enhanced photocatalytic Fenton reaction performance for 1%Fe/CN.At a molar concentration of 0.02 mol/L of H_(2)O_(2),the degradation rate of RhB reached 98.4%after 180 min under visible light.In both reaction systems,the dominant roles were played by h^(+),followed by·O_(2)^(-),and finally·OH.The 1%Fe/CN catalyst showed favourable structural stability and recycling performance.After three cycles of the photo-Fenton reaction,the activity declined by approximately 14.9%.

关 键 词：FE掺杂 g-C_(3)N_(4) 光催化-芬顿反应 可见光降解 罗丹明B 

分 类 号：TB332[一般工业技术—材料科学与工程]