化学
光降解
光致变色
荧光
光催化
选择性
联苯胺
光化学
降级(电信)
分子
纳米技术
人类健康
化学工程
光敏性
光漂白
可见光谱
环境污染
氯化物
催化作用
作者
Zheyang Chi,Yuan Qin,Jingcheng Zheng,Yuwu Chi,Shulin Zhao,Fanggui Ye
标识
DOI:10.1021/acs.analchem.5c05218
摘要
3,3'-Dichlorobenzidine (DCB) is an important and widely used intermediate in manufacturing various industrial products; however, DCB is a Group 2B carcinogen and its photodegraded product of benzidine is classified as Group 1 carcinogen. So far, there are few sensing strategies aiming to detect DCB remaining in related industrial products and discharged into the human living environment for assessing its impact on human health in an easy, low-cost, and real-time way. In this work, we found that the recently emerging perovskite nanocrystals (PNCs) with many excellent physiochemical properties could act as both photocatalysts and photochromic materials in the photodegradation of DCB. Under UV irradiation, PNCs catalyze the photodegradation of DCB molecules into benzidine molecules and chloride ions (Cl-), followed by significant fluorescence wavelength (color) change of PNCs due to ion-exchange between PNCs and the photogenerated Cl-. Based on the catalytic photodegradation of DCB and photochromism of PNCs, a novel, facile, low-cost, and visualized fluorescent sensor has been developed for the real-time detection of DCB with high sensing selectivity and sensitivity. The novel PNCs-based photochromic fluorescent sensing strategy not only greatly improves the sensing selectivity by innovatively introducing photodegradation and photochromism into the construction of sensing interfaces but also may inspire the applications of the photochromic fluorescent sensors in real-time monitoring of the photodegradation of various environmental pollutants.
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