A Z-scheme defect-rich and dimensionally confined double functionalized g-C3N4 homojunction pectin hydrogels for the photocatalysis-self-Fenton-peroxymonosulfate system: Unraveling synergistic catalysis and reaction mechanism
Akash Balakrishnan, Mahendra Chinthala, Arvind Kumar, Damia Barceló, Sami Rtimi
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引用次数: 0
Abstract
A highly efficient, defect-rich, and dimensionally engineered carbon nitride homojunction hydrogel (NTCN hydrogel) was developed for the in-situ generation of H2O2 under the illumination of visible light. The photocatalytic-self-Fenton (PSF) system was integrated with peroxymonosulfate (PMS), enhancing the production of reactive oxygen species, which aided the tetracycline degradation to 99.5 % in 8 min. The NTCN hydrogels also displayed a maximal reusability of 20 cycles with a slight decline in the degradation efficiency. The superior catalytic performance is indicated by the establishment of a Z-scheme junction in the NTCN hydrogel, which is attributed to the higher separation efficiency, rapid H2O2 generation, and synergistic interaction between the PMS and PSF in the hybrid oxidation system. The mechanistic pathways revealed the synergistic interaction between the PMS and H2O2 in the PSF-PMS hybrid oxidation system, enhancing the performance of NTCN hydrogels in a wider range of pH. Under basic pH conditions, the PMS and H2O2 are produced on the surface of NTCN hydrogels to mutually generate OH and 1O2, which led to enhance the lower degradation efficacy in the PSF system. At acidic pH, the O2− emerges as a predominant Reactive Oxygen Species (ROS), and the synergistic action of H2O2 and PMS completely avoided the dependency on protons by the PSF-PMS system. This study describes a highly efficient and sustainable hybrid multifunctional oxidation system for the purification of tetracycline from synthetic wastewater.
期刊介绍:
The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.