Introducing Br, K, and cyano group into carbon nitride for efficient photocatalytic hydrogen peroxide production then in situ tetracycline mineralization

Huawei Fang; Yu Zhang; Jixiang Xu; Jun Xing; Haifeng Lin; Lei Wang

doi:10.1016/j.jcis.2024.04.104

Introducing Br, K, and cyano group into carbon nitride for efficient photocatalytic hydrogen peroxide production then in situ tetracycline mineralization

J Colloid Interface Sci. 2024 Aug:667:433-440. doi: 10.1016/j.jcis.2024.04.104. Epub 2024 Apr 16.

Authors

Huawei Fang¹, Yu Zhang¹, Jixiang Xu², Jun Xing¹, Haifeng Lin¹, Lei Wang³

Affiliations

¹ Key Laboratory of Eco-chemical Engineering, Taishan Scholar Advantage and Characteristic Discipline Team of Eco-Chemical Process and Technology, Qingdao University of Science and Technology, Qingdao 266042, China; College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
² Key Laboratory of Eco-chemical Engineering, Taishan Scholar Advantage and Characteristic Discipline Team of Eco-Chemical Process and Technology, Qingdao University of Science and Technology, Qingdao 266042, China; College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China. Electronic address: [email protected].
³ Key Laboratory of Eco-chemical Engineering, Taishan Scholar Advantage and Characteristic Discipline Team of Eco-Chemical Process and Technology, Qingdao University of Science and Technology, Qingdao 266042, China; College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China. Electronic address: [email protected].

PMID: 38640662
DOI: 10.1016/j.jcis.2024.04.104

Abstract

In this work, Br, K-doped and cyano group-rich carbon nitride (CN) were prepared via pyrolysis of molten urea and 6-Bromopyridine-3-carbaldehyde, followed by re-calcination with potassium thiocyanate. The hydrogen peroxide (H₂O₂) evolution and in situ tetracycline (TC) mineralization performances of the prepared samples were studied. The optimal sample could produce 9127 μmol g^-1 h^-1 H₂O₂ from 10 vol% ethanol solution and air atmosphere, which was 10.9 times higher than that of pristine CN. With addition of 4 mg L^-1 Fe²⁺ ions, 97.2% of TC (10 mg L^-1) and 98.7% of total organic carbon were removed in 30 min under the actions of holes, hydroxyl and superoxide radicals. The high H₂O₂ yield and TC mineralization ratio were attributed to the increased light absorption, efficient electrons-holes separation, enhanced surface O₂ adsorption (0.3878 mmol g^-1), and accelerated conversion from Fe³⁺ to Fe²⁺ ions. Meanwhile, the system possessed good reusability in H₂O₂ evolution and TC removal. It is expected that this work can provide new ideas to design CN-based photo-Fenton system to treat wastewater.

Keywords: Br, K and cyano group; Carbon nitride; H(2)O(2) production; Tetracycline degradation.