CERAMICS INTERNATIONAL
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2018
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IF 3.057
Xiang Lv,Tianhe Wang,Wei Jiang
We report a novel method to prepare translucent and stable Ag@AgCl/g-C 3 N 4 /TiO 2 ceramic films having strong photocatalytic activities and self-cleaning capabilities under light irradiation. Colloidal silica was used as an inorganic binder and P25 TiO 2 was added as a hydrophilicity enhancer without which a smooth coating was not achievable. Ag@AgCl of particle size around 30 nm, was synthesized by in-situ oxidation of nano-silver particles in porous g-C 3 N 4 /TiO 2 films. Optimal conditions for Ag@AgCl/g-C 3 N 4 /TiO 2 preparation in terms of strongest photocatalysis were established by tests on Rhodamine B degradation under visible and full spectral irradiations. A good adhesion strength of the porous films on glass substrate was achieved. Stability and reusability of the films were assessed by cycling tests. Possible photocatalytic mechanisms are proposed based on the basis of trapping experiments. Systematic characterization of the film suggests that the in-situ oxidation is an effective and practical method to produce nanoscale Ag@AgCl.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Liquan Jing,Yuanguo Xu,Zhigang Chen,Minqiang He,Meng Xie,Jie Liu,Hui Xu,Shuquan Huang,Huaming Li
Highly efficient different morphologies of SnS2 (nanoparticles, nanosheets, and 3D flower-like)/g-C3N4 composites were, respectively, prepared via an elementary hydrothermal method that was integrated with the calcination means. The XRD results showed that the relative intensities of several diffraction peaks, especially (001), (100), (101), and (102), indicated that the as-prepared samples (SnS2 nanoparticle, SnS2 nanosheet, and 3D flower-like SnS2) should be dominated by different specific preferred growth of facets. In comparison with SnS2 and pure g-C3N4, the SnS2/g-C3N4 composites exhibited much higher H2 development performance under visible light irradiation in the presence of Na2SO3 and Na2S as the sacrificial agent. The SnS2 nanoparticles/g-C3N4 composites exhibit the highest visible-light-driven H2-generation rate of 6305.18 μmol h–1 g–1 without any noble metal as cocatalyst, which is approximately 16.98 times higher than that of SnS2 nanoparticles. In all, the SnS2 nanoparticles (SnS2 nanoparticle/g-C3N4 composite) dominated by (001) and (100) preferred growth of facets exhibit significant photocatalytic activity resulting from their suitable band edges to realize the photocatalytic redox reaction. The analysis of photocurrent response, linear sweep voltammograms, and photoluminescence demonstrated that the low recombination rate and the efficacious charge transfer of photogenerated carriers could be assigned to the interactive impact of g-C3N4 and SnS2.
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APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Shangyuan Yu,Fengjue Wang,Meng Chen
The influence of morphology on the photocatalytic performance of catalysts is a critical aspect that merits further exploration. This study successfully synthesized a series of CdIn 2 S 4 /self-assembled g-C 3 N 4 photocatalysts with varying morphologies and structures via an in-situ deposition approach. The unique combination of g-C 3 N 4 ′s surface curvature and the radial-spreading layers significantly contributed to the superior photocatalytic activity observed in the optimal sample. This sample achieved an impressive 91.3 % degradation of methyl orange within 30 min and an 81.6 % degradation of tetracycline hydrochloride in 120 min. These degradation rates surpassed those of pristine g-C 3 N 4 by factors of 13.12 and 1.14, respectively. The findings of this research offer a promising strategy for designing highly active heterojunction photocatalysts tailored for pollutant removal and guiding the uniform deposition of CdIn 2 S 4 .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
·Vol. 31
·期 43
·55836-55849
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IF 0
Kang Lu,Wang Ying,Du Ruihan,Zhang Jinpu,Kang Chunli
In this paper, a modification of g-C 3 N 4 was carried out by combining non-metal doping with the construction of heterojunctions, and a type II heterojunction composite, S/g-C 3 N 4 @β-Bi 2 O 3 , was prepared. The phase structure, morphology, elemental composition, valence band structure, and light absorption performance of the photocatalyst were analyzed using characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance spectroscopy (UV–vis DRS). The performance of the composite photocatalyst in the photocatalytic degradation of gaseous toluene, one of the typical volatile organic compounds (VOCs), under simulated solar light was studied. The effects of preparation conditions, toluene concentration, and recycling on the photocatalytic performance of the composite photocatalyst were investigated. The results show that under the optimal preparation conditions, S/g-C 3 N 4 @β-Bi 2 O 3 achieved a degradation efficiency of 74.0% for 5 ppm toluene after 5 h of light irradiation. Although the degradation efficiency decreased to 61.2% after five cycles, it maintained 83% of its initial activity, indicating good stability of the composite photocatalyst. Free radical quenching experiments demonstrated that h + was the main active species in the photocatalytic degradation of toluene, followed by ·O 2 − . Based on all experimental results, the migration law of photo-generated charges was analyzed, and a possible photocatalytic mechanism was proposed. In this study, a new material was obtained for the photocatalytic removal of VOCs by improving the photocatalytic properties of g-C 3 N 4 .
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PubMed
JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Huan Cheng,Kuang Luo,Xiaojun Wen,Lijun You,Ning Cai,Jumei Li
In this work, we proposed a straightforward self-assembly and in-situ deposition protocol to construct Cu 2 O/g-C 3 N 4 /Ag composites, which demonstrated peroxidase-like attribute and exceptional SERS activity. These composites proved to be an effective SERS analysis tool for detecting organic fungicides like malachite green (MG) and crystal violet (CV). Remarkably, they achieved detection limits as low as 10 −9 M in DI water as well as fish pond water, and exhibited a strong linear correlation between logarithmic concentrations and SERS intensities (R 2 ≥ 0.97). Beyond that, with the aid of hydrogen peroxide (H 2 O 2 ), the peroxidase-like Cu 2 O/g-C 3 N 4 /Ag composites rapidly degraded MG and CV molecules within just 5 min. Furthermore, their practical reusability based on the peroxidase-like reaction was proved by high SERS performance across 5 detection cycles. These results emphasize the immense potential of Cu 2 O/g-C 3 N 4 /Ag in SERS-based trace fungicide detection and suggest future applications in ecological restoration through peroxidase-like reactions.
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CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Gang Liu,Sheng Xu,Wenting Li,Zhenxi Wang,Jinlong Cui
In order to expand the photoresponsive spectrum of TiO 2 and improve its catalytic activity under visible light, the hollow urchin-like composites of TiO 2 @g-C 3 N 4 /GQDs (TCN/GQDs) with a core-shell structure heterojunction was synthesized through a hydrothermal method and calcination. Potassium titanium oxalate, melamine, and citric acid were utilized as the raw materials for this synthesis process. The TCN/GQDs composites were subjected to a range of analyses to examine their microstructure and photoelectric properties. The findings indicated that the synthesized composites effectively enhanced the absorption spectrum of TiO 2 in the visible light range by creating the stable heterojunctions among TiO 2 , g-C 3 N 4 and GQDs. Additionally, the ability of these composites to degrade toxic organic pollutants under visible light was studied by using several different organic dyes and antibiotics. The results demonstrated that the TCN/GQDs composites exhibited efficient visible light catalytic degradation capability on organic pollutants, and the degradation efficiency could approach to 100 % under visible light in a short time. Furthermore, the photocatalyst exhibited hardly change of degradation efficiency towards organic pollutants even after 5 cycles of testing, suggesting its commendable performance in visible light catalysis and potential for repeated utilization.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Ruiting Li,Tengyang Gao,Yao Wang,Yan Chen,Wen Luo,Yang Wu,Yu Xie,Yong Wang,Yifan Zhang
The application of metal catalysis has gained prominence as a study area in recent years. In this work, we use adsorptive reduction and calcination to create Au–Pd alloy catalysts on COCN-2 with varying metal loadings. The plasma resonance effect of the alloys increases the photoresponse of the catalysts, and the engineering of nitrogen defects strengthens the strong bonds between Au–Pd alloy particles and carbon nitride graphite, optimizing the electronic structure, encouraging electron-directed migration, and increasing the efficiency of the reduction reaction. As a result, the efficiency of hydrogen generation by the Au–Pd 0.6 /COCN-2 catalyst is 5.089 mmol g −1 h −1 , which is 2367 times higher than that of the g-C 3 N 4 catalyst. Our findings highlight the crucial part that flaws play in strengthening the strong bonds that exist between the metal and the support, which enhances photocatalytic hydrogen generation. This work offers insightful information about creating effective photocatalysts.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Zhuofan Han,Dengjie Zhong,Yunlan Xu,Haixing Chang,Lin Dong,Yi Liu
In this study, based on Ag@AgCl/tubular g-C 3 N 4 (Ag@AgCl/TCN) composite, Ag nanoparticles were deposited on its surface to form Ag nanofilm enhanced composite through photoreduction of excessive silver nitrate solution to obtain Ag nanofilm Ag@AgCl/TCN photocatalyst . Finally, Ag nanofilm Ag@AgCl/TCN/Ti photoanode was successfully prepared by silica-sol drop-coating method, and assembled with Cu 2 O/Cu cathode to construct a photocatalytic fuel cell (PFC). Ag nanofilm can not only enhance the light absorption and utilization of Ag@AgCl/TCN/Ti, but also extend its light response wavelength to visible light , and be used as an electron transfer medium to reduce internal resistance. The photocurrent density and the photoconversion efficiency of the Ag nanofilm/Ag@AgCl/TCN/Ti are 8.01 mA·cm −2 and 1.24%, respectively, which are 2.49 and 2.54 times those of the Ag@AgCl/TCN/Ti photoanode, respectively. The first-order kinetic constant and the maximum power density of the Ag nanofilm-coated Ag@AgCl/TCN/Ti-Cu 2 O/Cu PFC system are 0.064 min −1 and 46.37 μW·cm −2 , respectively, which are 1.39 and 1.94 times those of the Ag@AgCl/TCN-Cu 2 O/Cu PFC system, respectively. In addition, it degraded more than 95% of rhodamine B, 72.68% of tetracycline and 54.25% of bisphenol A within 60 min. The excellent performance of Ag nanofilm/Ag@AgCl/TCN/Ti-Cu 2 O/Cu is due to the strengthening of Ag nanofilm and the formation of S-type heterojunctions between AgCl and TCN. Free radicals (•Cl, h + , •OH, •O 2 - ) and non-radicals ( 1 O 2 ) are involved in the degradation reaction of RhB degradation. It is worth noting that 6% Ag nanofilm/Ag@AgCl/TCN/Ti-Cu 2 O/Cu has a positive effect on the production of •O 2 - , and its output is approximately 1.89 times that of the Ag@AgCl/TCN/Ti-Cu 2 O/Cu. A series of material characterization experiments have been completed and possible mechanisms of operation have been proposed. This study provides a new scheme for the design and preparation of high-efficiency photoanode of PFC.
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Environmental Science-Nano
·
2024
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IF 5.8
Sichen Liu,Haotian Wang,Yumeng Xiao,David G. Calatayud,Boyang Mao,Gaoqi Zhang,Chenhui Yang,Lidong Wang,Meng Li
Drinking water contamination and water shortages are seriously exacerbated by industrial wastewater discharge. However, due to the high complexity of wastewater treatment systems, effective high-concentration pollutant removal and simplified wastewater recycling remain major challenges. Inspired by mangrove interconnected purification mechanisms, a novel cascade water treatment system has been developed using MoS2–g–C3N4 (MoG), an amphiphilic material, as the main and single component to directly produce drinking water from wastewater with high efficiency. This cascade system integrates membrane filtration and solar-powered water evaporation processes to produce clean water, while also overcoming the requirement for less polluted source water that is typically required for standalone solar evaporation-based clean water production. The MoG membrane, featuring an amphiphilic platform, exhibits a high removal rate for organic and heavy metal contaminants and achieves a water flow of 966 L m−2 h−1 bar−1 and an 80% efficiency in pollutant removal. The MoG-based aerogel enables nano- and micro-channels and exhibits a clean water production rate of 1.48 kg m−2 h−1 under 1 sun irradiation. The compact cascade system for practical use can produce drinking water that meets WHO standards from heavily polluted wastewater with an average hourly water production rate of 1.39 kg m−2 h−1. Life cycle assessment confirms that the cascade system displays significant environmental profile improvement with reduced CO2 equivalent (CO2e) levels with only 1/25 of that observed in conventional water treatment systems.
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CATALYSIS TODAY
·
2024
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IF 5.2
Sen Wang,Hong Chen,Qing Lin,Qian Lu,Wei Lv,Can Wang,Linhao Yu,Yingying Li,Yongdan Li
Two significant strategies for enhancing photocatalyst performance are heterojunction construction and band gap modulation, but up until now, these methods have typically been treated separately. This work examines a strategy combining the heterojunction with a mid-gap state to prepare a novel Cr 2 O 3 modified Cr-doped g-C 3 N 4 photocatalyst for antibiotics degradation. According to the characterization results, the integration of Cr 3d orbital energy level into the original band gap of g-C3N4 results in the formation of Cr-doped g-C 3 N 4 , leading to a reduction in the band gap from 2.80 eV to 2.36 eV. Besides, the constructed Z-type heterojunction enhances the separation of photoinduced carriers. The degradation experiments of tetracycline proved the significant enhancement in the photocatalytic performance of the prepared catalyst. In addition, the degradation effect of the prepared catalyst on tetracycline in micro-polluted lake water was also investigated, revealing the applicability of the catalyst in the purification of natural water environments.
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JOURNAL OF CATALYSIS
·
2017
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IF 6.844
Yanning Shi,Jingjing Chen,Zhiyong Mao,Bradley D. Fahlman,Dajian Wang
In this work, Z-scheme heterostructure were constructed over the visible light response g-C 3 N 4 photocatalysts by loading Porous silicon (PSi) to enhance the photocatalytic H 2 evolution performance. The synthesized Z-scheme g-C 3 N 4 /PSi composites with a PSi loading content of 2.50 wt% achieves the highest photocatalytic H 2 evolution rate at 870.4 µmol h −1 g −1 , which is about 2 times as high as the pure g-C 3 N 4 with H 2 evolution rate of 427.2 µmol h −1 g −1 . Various techniques including XRD, SEM, TEM, FTIR, XPS, UPS, PL and electrochemical method were employed to demonstrate the successful construction of g-C 3 N 4 /PSi composites and to investigate the origin of the enhanced potocatalytic activity. The formed heterostructure between g-C 3 N 4 nanosheets and PSi were verified to be the dominant reason for the enhancement of photocatalytic activity, resulting from the separation promotion of photogenerated charge carriers in a direct Z-scheme mechanism. This study presented a promising Z-scheme g-C 3 N 4 /PSi photocatalysts with promising H 2 evolution performance, which might drive the progress of solar energy conversion technologies.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yan Ding,Chang Bo,Lan Xin Li,Chenyu Gao,Xin Chi Ma,Zhiwei Li,Libin Yang
As a new method to obtain green and renewable energy, photocatalysis , converting from sunlight to chemical energy on the catalysts, shows its superiority since being experimentally found due to easy access and cleanliness. Graphite carbon nitride (g-C 3 N 4 ), as an efficient photocatalyst with a band gap respond to visible light, is prepared in nanotube morphology by template method to provide convenience for the directional transfer of light and separation of carriers to improve photocatalytic activity and quantum efficiency . The thicknesses of g-C 3 N 4 nanotubes (NTs) were controlled by addition amount of the precursor mass in the annealing treatment process. The migration of photogenerated electrons and holes in the wall of g-C 3 N 4 NTs was accelerated in reverse to bypass recombination center in an external magnetic field to improve the photocatalytic activity. The critical thickness of g-C 3 N 4 NTs wall is 72 nm for separating and impelling the photogenerated carrier pairs to the surface in the greatest extent possible and was proved by the experimental results of photoelectrochemical tests and photoluminescence spectra.
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