抗坏血酸改性Br掺杂g-C3N4光催化降解污染物

张仰全; 李学雷; 赵芷浚; 王彦娟; 苑兴洲; 张健; 胡绍争

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中国环境科学 ›› 2021, Vol. 41 ›› Issue (11) : 5160-5168.

水污染与控制

抗坏血酸改性Br掺杂g-C₃N₄光催化降解污染物

张仰全¹, 李学雷², 赵芷浚¹, 王彦娟¹, 苑兴洲¹, 张健¹, 胡绍争¹

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Ascorbic acid modified Br-doped g-C₃N₄ photocatalytic degradation of pollutants

ZHANG Yang-quan¹, LI Xue-lei², ZHAO Zhi-jun¹, WANG Yan-juan¹, YUAN Xing-zhou¹, ZHANG Jian¹, HU Shao-zheng¹

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摘要

以尿素和溴化铵分别作为前驱体和溴源，同时利用抗坏血酸对g-C₃N₄进行改性，通过二次焙烧法成功制备了抗坏血酸改性的Br掺杂g-C₃N₄-AA-Br纳米片光催化剂.利用XRD、TEM、XPS、UV-Vis DRS、PL、N₂吸附-脱附等测试手段对催化剂的结构、形貌、光学性能进行了表征.结果表明g-C₃N₄-AA-Br具有较大的比表面积、拓宽的可见光吸收范围以及较低的电子-空穴复合率.在可见光下考察了不同催化剂对RhB、甲基橙、活性蓝染料降解的光催化性能，结果表明g-C₃N₄-AA-Br-2在可见光下在180min内对RhB降解率为72%，其速率常数k=0.00847min^-1，是纯g-C₃N₄的5.6倍.通过活性物种捕获剂实验发现降解RhB的主要活性物种为羟基自由基（·OH）和超氧自由基（·O₂^-），并推测了可能的反应机理.

Abstract

Using urea and ammonium bromide as precursor and bromine source, respectively, and ascorbic acid was used to modify g-C₃N₄. The ascorbic acid modified Br-doped g-C₃N₄-AA-Br nanosheets photocatalyst was successfully prepared through secondary roasting. The structure, morphology and optical properties of the catalysts were characterized by XRD, TEM, XPS, UV-Vis DRS, PL, N₂ adsorption-desorption and other test methods. The results show that g-C₃N₄-AA-Br had larger specific surface area, wider visible light absorption range and lower electron-hole recombination rate. The photocatalytic performance of different catalysts on the degradation of rhodamine B, methyl orange, and reactive blue dyes was investigated under visible light. The results showed that g-C₃N₄-AA-Br-2 increased the degradation of RhB by 72% within 180minutes, and its rate constant k=0.00847min^-1, which is 5.6 times that of pure g-C₃N₄. Through the active species trapping agent experiment, it is found that the main active species that degrade RhB are hydroxyl radicals(·OH) and superoxide radicals(·O₂^-), and the possible reaction mechanism is speculated.

导出引用

张仰全, 李学雷, 赵芷浚, 王彦娟, 苑兴洲, 张健, 胡绍争. 抗坏血酸改性Br掺杂g-C₃N₄光催化降解污染物[J]. 中国环境科学. 2021, 41(11): 5160-5168

ZHANG Yang-quan, LI Xue-lei, ZHAO Zhi-jun, WANG Yan-juan, YUAN Xing-zhou, ZHANG Jian, HU Shao-zheng. Ascorbic acid modified Br-doped g-C₃N₄ photocatalytic degradation of pollutants[J]. China Environmental Science. 2021, 41(11): 5160-5168

中图分类号： X703.5

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