Preparation of g-C3N4 from mixed ammonium salts containing NH4SCN and characterization of its cobalt-modified photocatalytic degradation of formaldehyde
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引用次数: 0
Abstract
This paper aims to achieve high-quality utilization of desulfurization waste liquid mixed salt. CN-MIX was prepared through pyrolysis of a mixture containing ammonium thiocyanate, ammonium thiosulfate, and ammonium sulfate. Additionally, CN-MIX/Co-a was produced via an impregnation-pyrolysis method with cobalt modification. The performance of the photocatalysts was evaluated using the formaldehyde degradation rate as an index, and their stability was tested. The results indicate that the specific surface area and pore volume of CN-MIX/Co-a increase by 1.53-fold and 1.44-fold, respectively, compared to CN prepared from single salt. The cobalt loading inhibits the thermal polymerization of CN-MIX, leading to a reduction in the intensity of the (0 0 2) crystal diffraction peaks. Additionally, CN-MIX/Co-a exhibits an increase in the CN peak at 2000–2200 cm−1, generating more photocatalytic active sites. The absorption sideband in the visible range red-shifts from 429 nm to 458 nm, broadening the photoresponse range. The emission peak in the photoluminescence (PL) diagram decreases, reducing the photogenerated electron-hole recombination rate. The photocatalyst demonstrates enhanced photocatalytic degradation of formaldehyde gas, with the degradation rate of CN-MIX/Co-a increasing from 13.28 % to 99.2 %. Furthermore, after eight cycles of use, the degradation efficiency of CN-MIX/Co-a for formaldehyde remains above 90 %, indicating high stability.
期刊介绍:
JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds.
All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor).
The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.