A novel Co 3 O 4 /g-C 3 N 4 /Bi 2 O 2 CO 3 (BCCN) photocatalyst with p-n/n-n heterojunction was synthesized through a solvent-thermal method. The degradation efficiency of 20 mg/L iohexol reached 94 % in 60 min ( k app =0.0417 min −1 ) in BCCN/light/PS system, which was 2.8 and 6.5 times higher than systems of BCCN/light ( k app =0.0150 min −1 ) and BCCN/PS ( k app =0.0064 min −1 ). The g-C 3 N 4 addition lowered conduction band of the prepared material to produce superoxide radicals, activate persulfate and further prevent the recombination of photoelectrons and holes. Superoxide radicals and singlet oxygens were dominant radicals for iohexol degradation. Besides, persulfate could act as electron acceptor to enhance efficiency of electron transfer. The interaction between sulfate, superoxide and hydroxyl radicals improved singlet oxygens production. Furthermore, theoretical calculation and liquid chromatography mass spectrometry were performed to analyze degradation pathway of iohexol in the system. Ultimately, the BCCN/light/PS system can provide a new method to degrade organic pollutants in aquatic environments.
Menglu Zhang,Yueping Bao,Li-an Hou,Xiaoqiang An,Yiran Chai,Chuyang Y. Tang,Yiqun Fan,Yu Yang
This study presents a novel Co 3 O 4 /g-C 3 N 4 functionalized ceramic membrane (Co-CN-M) for emerging contaminants removal by integrating visible-light photocatalysis and peroxymonosulfate oxidation. The membrane was fabricated via in-situ growth of ZIF-67 on g-C 3 N 4 -modified substrates followed by calcination. The Co-CN-M overcomes the conventional trade-off between reactivity and permeability, simultaneously achieving outstanding degradation efficiency ( k = 0.24 min −1 for bisphenol A) and ultrahigh water flux (724 L·m −2 ·h −1 ·bar −1 ). This exceptional performance stems from: (1) the p-n heterojunction at g-C 3 N 4 /Co 3 O 4 interface that enhances charge transfer and Co 2+ /Co 3+ cycling, promoting h + /O 2 ·− -dominated degradation; and (2) a unique honeycomb morphology that facilitates mass transfer via enhanced surface properties and internal nanochannels. Application viability was also demonstrated by excellent antifouling and self-cleaning properties (>70 % flux recovery) and stable long-term (96 h) operation in surface water with minimal cobalt leaching (<0.007 mg·L −1 ). This work offers valuable insights into metal-organic framework (MOF)-based functional membrane fabrication for effective water purification.
Wenshuai Si,Yi Shao,Lijuan Chang,Wei Song,Shouying Wang,Zhijie Zhang,Chunxia Yao
A 2D/2D mesoporous Co 3 O 4 /g-C 3 N 4 nanocomposite with triple synergy was constructed. • The Co 3 O 4 /g-C 3 N 4 nanocomposite shows excellent antibiotic removal efficiency. • The photothermal effect accelerates TC degradation by elevating reaction temperature. • This work offers insights into the design of multimodal synergistic photocatalysts for environmental remediation. Developing potent photocatalysts is of great significance for both preventing and remediating antibiotic-polluted environments. In this work, a 2D/2D mesoporous Co 3 O 4 /g-C 3 N 4 (Co 3 O 4 /CN) nanocomposite is constructed and reported as a multimodal antibiotic-degrading photocatalyst featuring triple-function synergy: (1) The mesoporous structure of Co 3 O 4 increases the nanocomposite's surface area, enhancing antibiotic adsorption; (2) Co 3 O 4 /CN exhibits excellent full-spectrum light absorption and remarkable photothermal effect, elevating the temperature of the reaction system to facilitate photodegradation reaction; (3) The p-n heterojunction formed between Co 3 O 4 and g-C 3 N 4 promotes efficient separation of photogenerated electrons and holes. Owing to the combined action of its mesoporous structure, photothermal effect, and efficient charge separation, the Co 3 O 4 /CN nanocomposite demonstrates outstanding photocatalytic performance, with tetracycline (TC) being completely degraded (100% degradation rate) within 100 min. This research offers valuable references for the synthesis of multimodal synergistic photocatalysts applied in environmental remediation. Download: Download high-res image (275KB) Download: Download full-size image This work successfully constructed a 2D/2D Co₃O₄/g-C₃N₄ nanocomposite with triple-function synergy of mesoporous structure, photothermal effect, and p-n heterojunction, which provides valuable references for the design of multimodal synergistic photocatalysts in environmental remediation.
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