Construction of Advanced S-Scheme Heterojunction Interface Composites of Bimetallic Phosphate MnMgPO4 with C3N4 Surface with Remarkable Performance in Photocatalytic Hydrogen Production and Pollutant Degradation
Source abstract
Abstract
Novel S-scheme heterojunction interface composite (MnMgPO4@C3N4) of bimetallic phosphate MnMgPO4 and C3N4 with different proportions was successfully constructed in this work. The nanosheet surface structure and the integration interface of two materials endowed the composite heterojunctions with superior visible light absorption and improved photogenerated carrier transfer, boosting the photocatalytic hydrogen production and degradation performance. The interface composite (5C5MMP) with the optimal mass ratio (MnMgPO4/C3N4 = 5/5) achieved the strongest photocatalytic potency. The hydrogen evolution rate was about 3.595 mmol·g−1·h−1, and the pollutants of methylene blue (MB), oxytetracycline (OTC), and tetracycline (TE) were almost entirely degraded within 40 min. The degradation rates were approximately 97.1% (MB), 95.4% (OTC), and 99.7% (TE). Notably, the heterojunction interface composite displayed exceptional photocatalytic stability and structural durability. The photocatalytic mechanism revealed that the 5C5MMP heterojunction interface exhibited the strongest photocurrent response, the least electron transfer resistance, and the lowest carrier recombination rate, resulting in exceptional photocatalytic performance. Furthermore, both C3N4 and MgMnPO4 were identified as n-type semiconductors. The optimized band structure of the composite photocatalyst interface and the enhanced charge carrier separation enabled the 5C5MMP photocatalytic system to generate more reactive photogenerated electrons for reduction and holes for oxidation, significantly accelerating the photocatalytic hydrogen production and pollutant degradation. By proposing an S-scheme heterojunction interface composite, this research offers an innovative strategy for designing efficient composite photocatalysts and underscores the feasibility of using bimetallic phosphate composites to enhance hydrogen production and pollutant removal.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors · Luminescence Properties of Advanced Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Environmental Ecology, Jiangsu City Vocational College, Nanjing 210017, China
Jiangsu Engineering and Technology Centre for Ecological and Environmental Protection in Urban and Rural Water Environment Management and Low Carbon Development, Nanjing 210017, China
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China
College of Chemistry and Chemical Engineering, Anshun University, Anshun 561000, China
College of Environment and Resource, Xiangtan University, Xiangtan 411105, China
Nanjing University and Yancheng Academy of Environmental Technology and Engineering, Yancheng 224000, China
Funding
National Natural Science Foundation of China
References (90)
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