TY - JOUR
T1 - Strategic combination of nitrogen-doped carbon quantum dots and g-C3N4
T2 - Efficient photocatalytic peroxydisulfate for the degradation of tetracycline hydrochloride and mechanism insight
AU - Chen, Haoyun
AU - Zhang, Xin
AU - Jiang, Longbo
AU - Yuan, Xingzhong
AU - Liang, Jie
AU - Zhang, Jin
AU - Yu, Hanbo
AU - Chu, Wei
AU - Wu, Zhibin
AU - Li, Hui
AU - Li, Yifu
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (No. 72088101 , No. 51739004 , No. 21776066 ), the Hong Kong Scholars Programme (XJ2020049), the Fundamental Research Funds for the Central Universities ( 531118010394 ), and the Natural Science Foundation of Hunan Province, China (2020JJ5063).
Publisher Copyright:
© 2021
PY - 2021/10/1
Y1 - 2021/10/1
N2 - Photo-assisted peroxydisulfate (PDS) activation has exhibited a great potential for pollution control. In this study, metal-free nitrogen-doped carbon quantum dots (N-CQDs) modified g-C3N4 composite was fabricated and used to activate PDS under visible light to effectively remove tetracycline hydrochloride (HTC) in wastewater. Specifically, almost 90% of HTC (20 mg/L) was removed in 60 min under the conditions of an initial value of catalysis dose of 0.5 g/L and PDS dose of 0.6 g/L. Electron spin resonance analysis and trapping experiments confirmed that [rad]SO4−, [rad]O2− and h+ were found as the dominant contributors to the HTC degradation. PDS and N-CQDs acted as an electron acceptor to transfer the photogenerated charges, resulting in the successful activation of PDS. The promoting visible light absorption can be ascribed to up-conversion effect of N-CQDs. The combination strategy provides an innovative approach to synthesize binary metal-free carbonaceous photocatalysts for implementing PDS-based oxidative degradation of pollutants.
AB - Photo-assisted peroxydisulfate (PDS) activation has exhibited a great potential for pollution control. In this study, metal-free nitrogen-doped carbon quantum dots (N-CQDs) modified g-C3N4 composite was fabricated and used to activate PDS under visible light to effectively remove tetracycline hydrochloride (HTC) in wastewater. Specifically, almost 90% of HTC (20 mg/L) was removed in 60 min under the conditions of an initial value of catalysis dose of 0.5 g/L and PDS dose of 0.6 g/L. Electron spin resonance analysis and trapping experiments confirmed that [rad]SO4−, [rad]O2− and h+ were found as the dominant contributors to the HTC degradation. PDS and N-CQDs acted as an electron acceptor to transfer the photogenerated charges, resulting in the successful activation of PDS. The promoting visible light absorption can be ascribed to up-conversion effect of N-CQDs. The combination strategy provides an innovative approach to synthesize binary metal-free carbonaceous photocatalysts for implementing PDS-based oxidative degradation of pollutants.
KW - Advanced oxidation process
KW - Metal-free
KW - N-CQDs/g-CN
KW - Peroxydisulfate
KW - Visible light photocatalysis
UR - https://www.scopus.com/pages/publications/85106343709
U2 - 10.1016/j.seppur.2021.118947
DO - 10.1016/j.seppur.2021.118947
M3 - Journal article
AN - SCOPUS:85106343709
SN - 1383-5866
VL - 272
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 118947
ER -