1. Evaluation of the adsorption and degradation performance of lanthanum-modified mesoporous carbon nitride composite materials for tetracycline wastewater treatment.
- Author
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Wu, Zhiqiang, Li, Yueyi, Jiang, Pengxi, Ma, Sisi, Dong, Wenfei, Zhao, Hongjian, Feng, Enke, and Wang, Xu-Ming
- Subjects
LANGMUIR isotherms ,COMPOSITE materials ,CARBON composites ,WASTEWATER treatment ,NITRIDES ,PORE size distribution ,POROSITY ,ANTIBIOTIC residues - Abstract
Lanthanum-modified mesoporous graphite nitride carbon composites (La-g-C
3 N4 ) were synthesized using a thermal shrinkage polymerization method. The samples underwent characterization through X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmet–Teller (BET) analysis. The results revealed that the La30 -g-C3 N4 sample displayed a more porous layered morphology with a uniform pore structure. The BET surface area of the sample was found to be 38.6 m2 g−1 , which is 5.8 times higher than that of the undoped sample g-C3 N4 . The sample exhibited a type IV isotherm, indicating its mesoporous nature with a pore size distribution ranging from 3 to 20 nm. The application of these materials was investigated for the degradation of tetracycline (TC) and acidic fuchsin (AF) in simulated wastewater. The results demonstrated that the La30 -g-C3 N4 sample exhibited rapid and efficient degradation, along with excellent adsorption capacity for both TC and AF. Within 5 minutes, the degradation efficiency of the La30 -g-C3 N4 sample for TC and AF was measured to be 83.1% and 74.1%, respectively, with corresponding adsorption capacities of 63.9 mg g−1 and 129.4 mg g−1 . The kinetic and thermodynamic analysis of the adsorption process revealed that the adsorption of TC and AF by La30 -g-C3 N4 followed the quasi-second-order kinetics and Langmuir adsorption isotherm model, indicating a predominantly single-layer chemical adsorption process. Furthermore, the composite material exhibited good cycling stability and maintained excellent adsorption performance even after six repeated uses. [ABSTRACT FROM AUTHOR]- Published
- 2024
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