Insight into the role of charge carrier mediation zone for singlet oxygen production over rod-shape graphitic carbon nitride: Batch and continuous-flow reactor

被引：30

作者：

Kim, Hyeseong ^{[1
]}

Choong, Choe Earn ^{[1
,2
]}

Han, Ihn ^{[2
]}

Park, Chang Min ^{[3
]}

Nah, In Wook ^{[4
]}

Kim, Jung Rae ^{[5
]}

Jeon, Byong-Hun ^{[6
]}

Yoon, Yeomin ^{[7
]}

Jang, Min ^{[1
,2
]}

机构：

[1] Kwangwoon Univ, Dept Environm Engn, 20 Kwangwoon Ro, Seoul 01897, South Korea

[2] Kwangwoon Univ, Plasma Biosci Res Ctr, 26 Kwangwoon Ro, Seoul 01899, South Korea

[3] Kyungpook Natl Univ, Dept Environm Engn, 80 Daehak Ro, Daegu 41566, South Korea

[4] Korea Inst Sci & Technol, Ctr Energy Convergence, Seoul 02792, South Korea

[5] Pusan Natl Univ, Sch Chem Engn, 63 Busandeahak Ro, Busan 46241, South Korea

[6] Hanyang Univ, Dept Earth Resources & Environm Engn, Seoul 04763, South Korea

[7] Univ South Carolina, Dept Civil & Environm Engn, 300 Main St, Columbia, SC 29208 USA

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2022年 / 424卷

基金：

新加坡国家研究基金会;

关键词：

Photocatalysis; Singlet oxygen; Graphitic carbon nitride; Continuous stirred tank reactor; ENHANCED PHOTOCATALYTIC DEGRADATION; PERSISTENT ORGANIC POLLUTANTS; HYDROGEN-PRODUCTION; ULTRATHIN G-C3N4; GENERATION; OXIDATION; WATER; NITROGEN; NANOSHEETS; MECHANISM;

D O I：

10.1016/j.jhazmat.2021.127652

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

As a new approach of creating the photo-exited electron (e(-)) and hole (h(+)) mediation zone for highly selective singlet oxygen (O-1(2)) production, the rod-type graphitic carbon nitride (NCN) has been synthesized from the nitric acid-modified melamine followed by the calcination. The NCN exhibited a higher surface area and surface oxygen adsorption ability than bulk graphitic carbon nitride (BCN). The increment of C=O and NHx groups on NCN corresponded to e(-) and h(+) mediation groups, respectively, resulting in higher production of O-1(2) than BCN. Moreover, those mediation groups on NCN result in higher recombination efficiency and longer e(-) decay time. As a result, the optimized NCN-0.5 (derived from 0.5 M of nitric acid-modified melamine) displayed 5.8 times higher kinetic rate constant of atrazine (ATZ) removal under UVA-LED irradiation compared to BCN. This study also evaluated the ATZ degradation pathways and toxicity effect of by-products. In addition, continuous flow experiments using NCN-0.5 showed superior ATZ removal performance with a hybrid concept between a slurry photocatalysis and a continuous stirred tank reactor system using actual effluent obtained from a wastewater treatment plant. Thus, this work provides an insight into the strategy for highly selective O-1(2) production and the potential for water purification application.

引用

页数：15