ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2023
·
IF 6.8
Wei Liu,Jin Zhang,Qun Kang,Hongbing Chen,Ru Feng
Environmental pollution by organic pollutants poses a great threat to the ecosystem and human development. Solar-powered catalytic oxidation technology can solve the existing energy and pollution crisis. Hence, in this work, cubic nano-In 2 O 3 modified g-C 3 N 4 composite was synthesized by in situ calcination, then it was coupled with hydrogen peroxide for the degradation of antibiotic under visible light. The results of SEM and XPS showed that In 2 O 3 and g-C 3 N 4 were closely combined. The catalytic oxidation efficiency of the antibiotic doxycycline was greatly improved when the as-prepared compound was coupled with hydrogen peroxide, and 88.2% of doxycycline was degraded within 80 min. By designing the active species inhibition test, it was found that a large number of hydroxyl radicals were generated in the system after adding hydrogen peroxide, which accelerated the degradation of the target. Hydrogen peroxide not only acts as a source of hydroxyl radical, but also as an active electron acceptor, which promotes the separation of photogenerated electron-hole pairs in the composite photocatalyst. Therefore, the double oxidation system formed by In 2 O 3 /g-C 3 N 4 coupled with hydrogen peroxide can degrade the target at a higher rate. This work provided a research basis for the synthesis of In 2 O 3 with regular morphology and simplified synthesis of In 2 O 3 /g-C 3 N 4 , and explored the practicability of the coupling method of double advanced oxidation for pollutant degradation.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 1
·101-119
·
IF 3.134
Chen Fenghua,Yang Maosen,Shi Xiangdong,Qin Xiaoyun,Chen Qingtao,Jiang Liying,Jia Chunxiao
In order to increase the photocatalytic performance of titanium dioxide mesocrystals (TMCs), in this study, Ag nanoparticles with different mass content were first photodeposited on the surface of as-prepared TMCs to form heterostructured Ag–TMCs catalysts, followed by loading them on g-C 3 N 4 via one step “bottom-to-up” calcination method. The results of photocatalytic degradation toward RhB experiments showed that the prepared ternary photocatalyst of g-C 3 N 4 /Ag–TMCs exhibited excellent photocatalytic activity not only compared with the bare TMCs and Ag–TMCs, but also with all of those reported TiO 2 /Ag/g-C 3 N 4 ternary photocatalysts. Such improved photocatalytic properties were attributed to the synergistic effect created by the LSPR effect and an important role as an electron-conduction bridge of Ag and the existence of heterojunction structure formed between Ag, TMCs and the further coupling g-C 3 N 4 , which added to the evidences that enabled the prepared g-C 3 N 4 /Ag–TMCs catalyst enhanced transfer efficiency of photogenerated carriers and suppressed recombination rate of electron-hole pairs. Moreover, the deposited Ag content had a positive effect on the photocatalytic degradation efficiency. On the basis of the results of this study, the specimen of g-C 3 N 4 /9% Ag–TMCs showed RhB degradation efficiency up to 100% under only 15 min visible-light irradiation. A possible degradation mechanism was also proposed based on several characterizations including photoluminescence spectrum and a serious of photoelectrochemical measurements. Overall, the prepared g-C 3 N 4 /Ag–TMCs ternary photocatalyst with good recyclability looked promising for future practical applications in the visible-light photodegradation of organic pollutants.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiangna Xing,Xin Huang,Xin Yong,Xin Li,Jun Li,Jingkang Wang,Na Wang,Hongxun Hao
Metal-free g-C 3 N 4 has received wide attentions because of the economy and environmental friendliness of it. However, the synthesis of simple and efficient g-C 3 N 4 modified materials is still challenging. In this study, series of novel N -doped porous thin-walled g-C 3 N 4 nanotubes (CNx) were synthesized through supramolecular self-assembly and thermal polymerization using melamine and aminourea hydrochloride as raw materials. SEM, XRD, XPS, etc. were used to analyze microscopic morphology and chemical structure of synthesized photocatalysts. PL spectra, EIS Nyquist curves and UV–vis DRS, etc. were applied to study the photoelectrochemical and optical properties. Besides, the performance of the synthesized catalysts was illustrated through TC photodegradation experiments, and the degradation rate of tetracycline (TC) by CN0.75 can reach to 93.0 % and the reaction rate constant was calculated to be 0.1347 min −1 . The excellent photocatalytic activity is primarily related to higher specific surface area and the formation of midgap states after N doped, which is conducive to the separation of charges. Finally, the possible pathways and mechanisms were proposed by determining the degradation intermediates and active species in the TC photodegradation process.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jie Zhou,Beibei Zhu,Lu Wang,Yan Bao,Guofeng Guan
Higher electron transfer efficiency is an important way to improve the activity of photocatalysts. A novel Z-scheme CdS/CeO 2 /g-C 3 N 4 nanocomposite was successfully synthesized by a solvothermal method, and its photocatalytic activity was evaluated by the degradation of phenol. The phase structure, morphology, surface structure, and atomic valence state of the as-obtained photocatalyst were characterized by XRD, SEM, TEM, FT-IR, XPS, and UV–Vis absorption spectroscopy, respectively. The CdS/CeO 2 /g-C 3 N 4 nanocomposite exhibited a remarkable photocatalytic activity and a rapid degradation ability for phenol with a degradation rate of 95 % in 180 min, which was considerably better than those of pure CeO 2 and CdS/CeO 2 under the same conditions, suggesting a synergistic effect in the nanocomposite. The enhancement of the photocatalysis ability of the nanocomposite is mainly attributed to the higher adsorption capacity of three-dimensional porous g-C 3 N 4 and the three-dimensional space electric field formed by its complex with CdS and CeO 2 . The three-dimensional porous structure is not only conducive to the efficient adsorption of pollutants but also provides active sites for photocatalytic reactions. The three-dimensional space and the network interconnection structure are conducive to the directional migration of photogenerated charges and increase the carrier lifetime. In brief, this work provides a new route to the design and synthesis of CdS/CeO 2 /g-C 3 N 4 for colorless organic pollutants photodegradation under visible light.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2022
·Vol. 52
·期 5
·885-893
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IF 2.925
Zhao Fei,Xue Wenwen,Zhang Hongfang
Abnormal expression and functioning of microRNAs in the immune system are frequently linked to various cancers. Our previous work demonstrated a universal, label-free, and reliable microRNA detection platform based on the nanochannels-based recognition interface and electrode-based sensing interface. Herein, the strategy of G-quadruplex DNAzyme-catalyzed deposition was introduced into the nanochannels to improve the detection sensitivity of the platform. G-quadruplex DNAzyme could catalyze the oxidation of 4-chloro-1-naphthol to produce insoluble precipitates into the nanochannels which amplified the effect of the hybridization reaction between the capture probe and the target to the mass transport of the redox probe through the recognition interface. Then, a porous carbon nanofibers-modified electrode was applied to further amplify the monitoring sensitivity of the sensing interface to the concentration change of the redox probe methylene blue. Thereby, sensitive electrochemical detection of microRNA-21 was acquired. The biosensing platform exhibited a broad linear range of 100 aM to 1 nM for microRNA-21, with a low detection limit of 40 aM. What is more, the selective and reproducible platform provided an alternative technique for the PCR-free determination of microRNA in serum and tumor cells. Graphical abstract
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiang Li,Guigan Fang,Qingwen Tian,Ting Wu
The radicals generated by photocatalysis are widely used in environmental pollution treatment due to their super oxidizing ability and non-polluting characteristics, and are controlled through band potential and electron transfer types. Herein, through crystal engineering, we developed a novel g-C 3 N 4 /BiVO 4 containing BiVO 4 with different crystal structures, which can generate superoxide radicals and hydroxyl radicals under light irradiation. The (1 1 0) and (0 1 0) of BiVO 4 crystal face showed different electron transfer paths, which proves that the existence of the build-in electric field is the internal driving force of S-scheme electron transfer. S-scheme electron transfer can reduce the recombination of electrons and holes, and promote the photocurrent density, and type Ⅱ electron transfer can reduce the decomposition of active oxides. By adjusting the ratio of S-scheme and type Ⅱ electron transfer, the addition of 1 % g-C 3 N 4 could increase the photocatalytic activity of organic pollutants by 2.3 times. And the gap between the interfaces of g-C 3 N 4 and BiVO 4 also increases the adsorption capacity of pollutants. This research provides a theoretical basis for the regulation of the crystal structure and interface electron transfer in photocatalysis.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 32
·48522-48538
·
IF 5.19
Wang Guanghui,Li Yingjie,Dai Jialing,Deng Nansheng
In this present study, a novel indirect Z-scheme TiO 2 @g-C 3 N 4 @biochar (TiO 2 @g-C 3 N 4 @BC) composite photocatalyst was successfully fabricated and characterized with SEM, TEM, EDS, XRD, FTIR, PL, XPS, and UV–vis DRS. The photocatalytic degradation behavior of ciprofloxacin (CIP) on the TiO 2 @g-C 3 N 4 @BC was evaluated under UV–vis and visible light irradiation, and the possible reaction mechanism of photocatalytic oxidation of CIP on the TiO 2 @g-C 3 N 4 @BC was explained. The TiO 2 @g-C 3 N 4 @BC composite photocatalyst exhibited stronger photocatalytic oxidation activity for CIP in comparison with TiO 2 , g-C 3 N 4 , TiO 2 @BC, and TiO 2 @g-C 3 N 4 . After 60 min of UV–vis and visible light irradiation, the photocatalytic removal efficiency of CIP by TiO 2 @g-C 3 N 4 @BC was 99.3 and 89.2%, respectively. The photocatalytic removal performance of CIP was affected by the initial concentration of CIP, catalyst dosage, and pH value. The composite photocatalyst presented excellent stability and reusability after five cycles. An indirect Z-scheme principle of the CIP photocatalytic oxidation reaction on TiO 2 @g-C 3 N 4 @BC was clearly proposed, and the whole process of photocatalytic degradation was the results of the interaction between CIP and reactive active species (·O 2 − , h + , and ·OH), of which ·O 2 − is the main active substance. Four CIP degradation pathways were proposed. This work may provide an effective strategy to remove antibiotics in wastewater.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Yi Zong,Pan Xu,Haoyu Yue,Xinxue Li
To improve the stability of the polymers applied to profile control in high-temperature and high-salinity reservoirs, a water-soluble graft-copolymer HPMC-g-poly(AM/AA/APEG2400) was synthesized from hydroxypropylmethylcellulose (HPMC), acrylamide (AM), acrylic acid (AA), and allyl polyoxyethylene ether (APEG2400) via free-radical copolymerization using potassium persulfate (KPS) as the initiator. The molecular weight (M w ) of HPMC-g-poly(AM/AA/APEG2400) was controlled by the addition of the chain-transfer agent, sodium formate (SF), to the polymerization medium and was measured by capillary viscometry. Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), proton nuclear magnetic resonance ( 1 H NMR), and scanning electron microscopy (SEM) were performed to characterize the graft-copolymer. The rheological properties of the graft-copolymer were investigated at different salinities and temperatures. The graft-copolymer solution showed better salt resistance, temperature tolerance, and long-term thermal stability than partially hydrolyzed polyacrylamide (HPAM). In addition, hydrogels were prepared using the graft-copolymer with varying M w (346 × 10 4 –1319 × 10 4 ), a crosslinker (hexamethylenetetramine–resorcinol, (HMTA–RC)), and additives (citric acid, (CA), and ammonium phosphate monobasic, (MAP)), and the hydrogels exhibited adequate strength and tunable gelation time. The hydrogels prepared using the graft-copolymer with high M w possessed excellent long-term stabilities with negligible syneresis at 45 °C after 130 d, for the same conditions, the syneresis of conventional hydrogels prepared by HPAM reached approximately 90%.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 10
·4163-4182
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IF 3.134
Yang Fanger,Zhang Haowen,Tang Qi,Lu Shihui,Zhang Hongsheng,Zheng Xiaohua
Photocatalysis is considered to be one of the possible routes to solve energy crises at a low cost. Graphitic-C 3 N 4 combined with other semiconductors at the nanoscale has demonstrated a promising potential in photocatalysis application owing to the heterojunction configuration. In this study, Ag/g-C 3 N 4 /CuNb 2 O 6 -4 (mass ratio of CuNb 2 O 6 to g-C 3 N 4 = 1:4) composites were prepared by photo-deposition of Ag particles on the hydrothermally synthesized g-C 3 N 4 /CuNb 2 O 6 -4 composites. The microstructure, morphology, and light absorption property of the photocatalysts were characterized by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–Vis diffuse reflectance spectroscopy. The photocatalytic properties of photocatalysts and active species responsible for the degradation of RhB dye under visible light were investigated. After loading Ag particles on the g-C 3 N 4 /CuNb 2 O 6 -4 composites, the resulting Ag/g-C 3 N 4 /CuNb 2 O 6 -4 composites show a bandgap of ~ 2.31 eV and a significant increase in photocatalytic efficiency. In particular, the photocatalytic activity of 11% Ag/g-C 3 N 4 /CuNb 2 O 6 -4 composite (Ag mass fraction = 11%) is nearly seven times that of orthorhombic CuNb 2 O 6 and 3.8 times that of g-C 3 N 4 /CNO-4 composite. The Z-scheme heterojunction has been successfully formed in the Ag/g-C 3 N 4 /CuNb 2 O 6 -4 composites and it enhances the photocatalytic performance significantly with the best degradation efficiency of 88% after 2 h.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Cheng Cheng,Dongyun Chen,Najun Li,Hua Li,Qingfeng Xu,Jinhui He,Jianmei Lu
Semiconductor materials have been used for photocatalytic degradation since they were discovered to be useful for photocatalytic degradation. Many studies have been researched to improve the efficiency of photocatalytic degradation. Among them, the introduction of vacancies to improve the photocatalytic efficiency has been verified to be a more feasible method. In this study, we combined two-dimensional (2D) graphite carbon nitride (g-C 3 N 4 ) nanosheets with oxygen-containing vacancy zero-dimensional (0D) Bi 2 WO 6 (BWO-OV) quantum dots to prepare 2D-0D g-C 3 N 4 /Bi 2 WO 6 -OV composite catalyst. The use of Bi 2 WO 6 containing oxygen vacancies enhanced the absorption of light and increased the generation of photogenerated carriers. In addition, the formation of heterojunction and the vacancy structure of Bi 2 WO 6 promote the life of photogenerated carriers and improve the catalytic effect of the catalyst. This structure shows high efficiency in removing low concentration (0.5 ppm) of nitric oxide (NO) at room temperature. The efficiency of the composite catalyst is much higher than g-C 3 N 4 or BWO-OV, and better than the composite g-C 3 N 4 /Bi 2 WO 6 without oxygen vacancies. When applied to NO removal, the composite g-C 3 N 4 /Bi 2 WO 6 -OV-10 showed the best catalytic activity which was up to 61.2%. At the same time, five cycles of experiments show that the material has excellent stability.
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LANGMUIR
·
2021
·
IF 3.882
Bowen Liu,Chuanbiao Bie,Yong Zhang,Linxi Wang,Youji Li,Jiaguo Yu
The design of photocatalysts with hierarchical pore sizes is an effective method to improve mass transport, enhance light absorption, and increase specific surface area. Moreover, the construction of a heterojunction at the interface of two semiconductor photocatalysts with suitable band positions plays a crucial role in separating and transporting charge carriers. Herein, ZIF-8 and urea are used as precursors to prepare hierarchically porous ZnO/g-C3N4 S-scheme heterojunction photocatalysts through a two-step calcination method. This S-scheme heterojunction photocatalyst shows high activity toward photocatalytic H2O2 production, which is 3.4 and 5.0 times higher than that of pure g-C3N4 and ZnO, respectively. The mechanism of charge transfer and separation within the S-scheme heterojunction is studied by Kelvin probe, in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS), and electron paramagnetic resonance (EPR). This research provides an idea of designing S-scheme heterojunction photocatalysts with hierarchical pores in efficient photocatalytic hydrogen peroxide production.
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Nanomaterials
·
2021
·Vol. 11
·期 12
·3266
·
IF 5.076
Yang Li,Yue Lu,Zhaoyu Ma,Lianqing Dong,Xiaofang Jia,Junying Zhang
Graphitic carbon nitride (g-C3N4) has been widely studied as a photocatalyst for the splitting of water to produce hydrogen. In order to solve the problems of limited number of active sites and serious recombination rate of charge-carriers, noble metals are needed as cocatalysts. Here, we selectively anchored Pt nanoparticles (NPs) to specific nitrogen species on the surface of g-C3N4via heat treatment in argon–hydrogen gas mixture, thus achieving g-C3N4photocatalyst anchored by highly dispersed homogeneous Pt NPs with the co-existed metallic Pt0and Pt2+species. The synergistic effect of highly dispersed metallic Pt0and Pt2+species makes the catalyst exhibit excellent photocatalytic performance. Under the full-spectrum solar light irradiation, the photocatalytic hydrogen production rate of the photocatalyst is up to 18.67 mmol·g−1·h−1, which is 5.1 times of the catalyst prepared by non-selective deposition of Pt NPs.Keywords:graphitic carbon nitride;platinum;selective deposition;photocatalytic hydrogen production
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