Page 171 - 《精细化工》2022年第7期
P. 171
第 39 卷第 7 期 精 细 化 工 Vol.39, No.7
2022 年 7 月 FINE CHEMICALS July 2022
水处理技术与环境保护
PS 协同 Z 型异质结二维 BiOI/g-C N 4
3
光催化降解四环素
*
殷 超,刘亚利 ,吕舒怡,吕昕雅
(南京林业大学 土木工程学院,江苏 南京 210037)
摘要:以三聚氰胺为前驱体,采用简单的热聚合法制备了超薄石墨相氮化碳(g-C 3 N 4 ),并用原位沉积-沉淀法在
g-C 3 N 4 表面生成 BiOI,复合构筑了不同 BiOI 与 g-C 3 N 4 质量比的二维 BiOI/g-C 3 N 4 (2D/BiOI/g-C 3 N 4 ,BICN-x)Z
型异质结。通过 XRD、FTIR、SEM、HRTEM、BET、UV-Vis DRS 对其结构、表面官能团、形貌、比表面积和光
学性能进行了表征分析。探讨了过二硫酸盐(PS)对 2D/BiOI/g-C 3 N 4 光催化降解四环素(TC)的影响。结果表明,
BiOI 与 g-C 3 N 4 质量比为 2∶1 时,制备的 BICN-3 具有密切的界面耦合,其光生电子-空穴对分离效率较高,光生
–
e 以更快的迁移速度到达结构表面,并且在 LED 照射 60 min 内,BICN-3(0.25 g/L)与 PS(2.0 mmol/L)形成的
催化体系(BICN-3/PS)对质量浓度为 10 mg/L 的四环素的降解率为 88.2%,降解速率常数是单独 BICN-3 的 3.82 倍。
关键词:石墨相氮化碳;BiOI;过二硫酸盐;电子-空穴对;水处理技术
中图分类号:X703;O643.36;O644.1 文献标识码:A 文章编号:1003-5214 (2022) 07-1457-08
Photocatalytic degradation of tetracycline by PS synergizing with
Z-type heterojunction two-dimensional BiOI/g-C 3N 4
*
YIN Chao, LIU Yali , LYU Shuyi, LYU Xinya
(School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China)
Abstract: Two-dimensional BiOI/g-C 3N 4 (2D/BiOI/g-C 3N 4, BICN-x) Z-type heterojunctions with different
mass ratios of BiOI to g-C 3N 4 were constructed via in situ deposition-precipitation of BiOI on the surface of
ultra-thin graphitic phase carbon nitride (g-C 3N 4), which was synthesized by simple thermal polymerization
of melamine. The structure, surface functional groups, morphology, specific surface area and optical
properties of the samples were characterized and analyzed by XRD, FTIR, SEM, HRTEM, BET and
UV-Vis DRS. Furthermore, the effect of persulfate (PS) on 2D/BiOI/g-C 3N 4 photocatalytic degradation of
tetracycline (TC) was investigated. The results showed that BICN-3 with a mass ratio of BiOI to g-C 3N 4 of
2∶1 displayed higher separation efficiency of photoelectron-hole pair via close interfacial coupling, and
–
faster migration speed of the photogenerated e to the structure surface. The catalytic system formed by
BICN-3 (0.25 g/L) and PS (2.0 mmol/L) (BICN-3/PS) exhibited a degradation rate of 88.2% for TC at a
mass concentration of 10 mg/L under LED irradiation for 60 min, and the degradation rate constant was
3.82-fold that of BICN-3 alone.
Key words: graphite-phase carbon nitride; BiOI; persulfate; electron-hole pair; water treatment technology
在治理难降解的微污染物方面,半导体光催化 究的半导体光催化剂中,2D 层状材料石墨相氮化碳
技术具有环保、可回收利用、低能耗和无二次污染 (g-C 3 N 4 )易于合成,具有可见光响应性、合适的
的优点,引起了科学界极大的兴趣 [1-3] 。在近些年研 禁带宽隙和稳定的物理化学特性,使其成为一种具
收稿日期:2022-02-11; 定用日期:2022-04-12; DOI: 10.13550/j.jxhg.20220126
基金项目:国家自然科学基金(51808282);江苏省自然科学基金(BK20160937)
作者简介:殷 超(1996—),男,硕士生,E-mail:fenaz091@163.com。联系人:刘亚利(1982—),女,副教授,E-mail:liuyali0418@
163.com。