Journal of Environmental Sciences
·
2023
·
IF 6.9
Ze Wang,Zhi Huang,Jiang Yu,Xiao Shao,Weidong Peng,Jie Yu,Yinying Jiang
Formaldehyde is a pollutant that significantly affects the indoor air quality. However, conventional remediation approaches can be challenging to deal with low-concentration formaldehyde in an indoor environment . In this study, Photocatalysts of Ag/graphitic carbon nitride (g-C 3 N 4 )/Ni with 3D reticulated coral structure were prepared by thermal polymerization and liquid phase photo-deposition, using nickel foam (NF) as the carrier. Experiments demonstrated that when the Ag concentration was 3%, and the relative humidity was 60%, the Ni/Ag/g-C 3 N 4 showed the maximum degradation rate of formaldehyde at 90.19% under visible light irradiation, and the formaldehyde concentration after degradation was lower than the Hygienic standard stated by the Chinese Government. The porous structure of Ni/Ag/g-C 3 N 4 and the formation of Schottky junctions promoted the Adsorption efficiency and degradation of formaldehyde, while the nickel foam carrier effectively promoted the desorption of degradation products . Meanwhile, the degradation rate was only reduced by 3.4% after 16 recycles, the three-dimensional porous structure extended the lifetime of the photocatalyst. This study provides a new strategy for the degradation of indoor formaldehyde at low concentrations.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-12
·
IF 2.9
Khatun Most Munera,Islam Ashraful,Yan Chunjie,Nesa Most Jinnatun
A nano-ZnO semiconductor material loaded with mineral attapulgite (ATP) photocatalyst has been investigated. Using ATP as a carrier, a variety of various mixtures of ZnO/ATP composites was synthesized. A scanning electron microscope (SEM), X-ray diffractometry (XRD), and UV-Vis spectrophotometer (UV-Vis) were used to examine the morphology, synergistic effects, and photocatalytic properties of ZnO/ATP nanocomposites. The target pollutant for photocatalytic degradation is methylene blue solution. When ATP is mixed with pure ZnO, the degrading performance of composite nanomaterials in methylene blue solution is considerably enhanced. The degree of methylene blue degradation increases as the amount of ATP in the composite grows, and the degradation rate of ZnO/40% ATP can reach 96% in 45 min under solar light illumination. The amount of ATP in the system is excessive, and the adsorption effect is visible. The optimal composite ratio was determined to be ZnO/30% ATP. After discovering the ideal composite ratio and synergy of ZnO/ATP, g-C 3 N 4 was compounded in the aforesaid system, dramatically increasing the composite’s photocatalytic activity. At 45 min, the degradation rate of methylene blue reaches 97%. The absorption range and intensity of ternary composites increased, and the photogenerated electron-hole recombination rate decreases significantly. The reaction rate constant increases from 0.033 to 0.069 min −1 . SEM revealed rod-like attapulgite particles packed with tiny zinc oxide particles and a moderate layered structure of C 3 N 4 . The XRD pattern indicated that C 3 N 4 ’s crystallinity is poor and ZnO’s peak intensity is excessively high, masking the composite material’s distinctive peaks. The degradation rate of g-C 3 N 4 /ZnO/30% ATP to methylene blue was found to be 91.5% after 5 cycles.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jianwen Zhou,Tianshang Shan,Hao Luo,Bruno Boury,Xia Xu,Hui Wu,Fengshan Zhang,He Xiao
Designing efficient semiconductors for photocatalytic oxygen reduction reaction (ORR) without sacrificial agent is an urgent challenge for H 2 O 2 production under ambient condition. Graphite carbon nitride (g-C 3 N 4 ) exhibits controllable regulation in band structure and light absorption for photocatalytic process. However, the photocatalytic H 2 O 2 synthesis by pristine g-C 3 N 4 is poor due to the fast recombination of photogenerated carriers and unfavorable selectivity of ORR. To enhance the photocatalytic H 2 O 2 production, different types of carbon can use in combination with g-C 3 N 4 . In the present work, we show how cellulose fiber from bamboo can lead to hybrid C/ g-C 3 N 4 photocatalyst with enhanced photocatalytic activity and H 2 O 2 production rate of 121.75 μmol·L −1 ·h −1 , which is 6.2-fold higher than that of pure g-C 3 N 4 without any sacrificial agent. The experimental results confirmed that TEMPO-cellulose derived hydrophilic carbon can not only accelerate the transfer of photo-generated electrons as well as efficient charge carrier separation, but also promote the sequential two-step single-electron ORR route. Thus, this work provides a pioneering perspective for tuning the electronic interaction between g-C 3 N 4 and cellulosic carbon for enhanced photocatalytic H 2 O 2 synthesis.
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RSC Advances
·
2022
·Vol. 12
·期 50
·32480-32487
·
IF 4.036
Jingzhe Li,Yue Chen,Liezhen Zhu,Linfa Liao,Xinmao Wang,Xun Xu,Lingfang Qiu,Jiangbo Xi,Ping Li,Shuwang Duo
In this study, a novel g-C3N4-based ternary heterojunction was rationally designed and constructed by the in situ growth of ZnIn2S4 nanosheets and CdS nanoparticles onto the g-C3N4 nanosheets using a facile two-step oil-bath method. Through optimizing the proportion of ZnIn2S4 and CdS component, g-C3N4 nanosheets coupled with ZnIn2S4 nanosheets and CdS nanoparticles (denoted as CdS/ZnIn2S4/g-C3N4) exhibited obviously higher photocatalytic properties for RhB removal than the single-component and dual-component systems. Among the as-obtained ternary photocatalysts, it was found that the ternary CdS/ZnIn2S4/g-C3N4-0.2 photocatalyst displayed the optimum photocatalytic property (96%) within a short time (30 min), which was almost 27.42 and 1.17 times higher than that of pure g-C3N4 and binary ZnIn2S4/g-C3N4-0.7 composite. The excellent activity of the ternary CdS/ZnIn2S4/g-C3N4 heterostructure is assigned to the synergetic effects of CdS nanoparticles, ZnIn2S4 nanosheets and g-C3N4 nanosheets, which not only broaden the visible-light absorption range, but also improve the charge mobility and separation rate, thus boosting the visible-light-driven photocatalytic property of g-C3N4.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wen-Wu Liu,Sheng-Tao Niu,Zhi-Qiang Xu,Rong Zou,Chong-Yang Cui,Yi-Xiao Lei,Xiao-Bo Zhang,Fen Ran
Lithium-sulfur (Li-S) batteries are promising next-generation energy storage devices due to high theoretical energy density and low-cost. Nevertheless, the practical applications are hindered by polysulfide shuttling effect, low electrical conductivity of sulfur, and slower conversion kinetics. Here, the graphited g -C 3 N 4 assembled with highly-dispersed nickel (HDNi@ g -C 3 N 4 ) is designed as a catalyst to accelerate the reaction kinetics of lithium polysulfide. The oxidized Ni sites of HDNi@ g -C 3 N 4 molecules significantly accommodate the orbital for the electron clouds of polysulfide by forming S n 2– ‧‧‧Ni-N active site, thus efficiently improving redox kinetics and mitigating shuttle effects. Based on density functional theory (DFT) calculations, HDNi@ g -C 3 N 4 exhibits a superior metallicity with increased density of states (DOS) at the Fermi energy level. Then, the narrowed energy gap between the lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) level contributes to the enhanced conductivity of catalyst molecular and fast combination between electrons and Li + ions. Moreover, the positive Gibbs free energy change is significantly decreased for the HDNi@ g -C 3 N 4 cathode. The Li-S battery exhibits a high reversible capacity of 1, 271.6 mAh g −1 at 0.1 C and a high rate capacity of 571.96 mAh g −1 at 2.0 C, a preferable cycling stability with a capacity retention of 53 % even after 500 cycles at a 1.0 C, and an average decay rate of 0.733 % per cycle.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 7
·19450-19465
·
IF 5.19
Chen Haodong,Shu Qing
In this study, a series of ternary composite photocatalysts ZnO/g-C 3 N 4 /AgCl( x ) ( x is the amount of AgCl added, x =0.05, 0.1, 0.15 g) were synthesized, and various characterization methods were used to analyze the morphology, structural, and photochemical properties of the above samples. The photocatalytic activity of the obtained samples was evaluated by degrading rhodamine B (RhB) and acid orange (AOII) under xenon lamp irradiation. The results show that the degradation rate of ZnO/g-C 3 N 4 /AgCl (0.1 g) is 99% within 60 min, which is much higher than the 38% degradation rate of g-C 3 N 4 . After five cycles, the degradation efficiency of RhB and AOII by ZnO/g-C 3 N 4 /AgCl (0.1 g) were still 85% and 94%, respectively. In addition to colored dyes, the photocatalytic degradation of colorless tetracycline hydrochloride (TCH) compounds was also investigated to understand the effect of photosensitization on the degradation process. Based on the electronic structure analysis of the DFT calculations, a staggered heterojunction structure was found between g-C 3 N 4 , ZnO, and AgCl. The enhanced photocatalytic activity of the ternary composite is mainly attributed to the efficient separation of charge carriers through the synergistic removal of photogenerated electrons in g-C 3 N 4 by ZnO and AgCl. Radical trapping experiments confirmed that •O 2 − and h + were the main active species in the reaction system. As a visible light-responsive catalyst, ZnO/g-C 3 N 4 /AgCl can be effectively applied to the degradation of organic dye pollutants and has broad application prospects.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2022
·
IF 3.407
Shuhui Yang,Kunqiang Wang,He Yu,Ying Huang,Peiyuan Guo,Chenxi Ye,He Wen,Gaotian Zhang,Dongxiang Luo,Feng Jiang,Liang Zhang
The research of waste recycling and clean energy are the key to sustainable development. To simultaneously accomplish the waste recycling and clean energy generation, carbon fibers (Fiber) prepared from the spent cigarette filters are utilized to promote the photocatalytic hydrogen evolution efficiency of a heterojunction photocatalyst. The spiral ladder morphology of Fiber supplies abundant loading sites for the ZnIn 2 S 4 /g-C3N 4 photocatalysts, allowing efficient charge separation. Detailed chemical and optical features of the samples are subsequently demonstrated by a combination of scanning electron microscopy, X-ray diffraction, Fourier transform infrared tests. X-ray photoelectron spectrum results reveal that a strong internal electric field was formed between Fiber and ZnIn 2 S 4 /g-C 3 N 4 , allowing sufficient driving force to extract the photo-generated electrons from the heterojunction photocatalyst. Gas chromatography monitors a ca . 37 % enhancement for H 2 evolution (322.41 μmol·g −1 ·h −1 ) compared with control group. This work suggests an attempt to exploit general wastes for promoting photocatalytic hydrogen evolution.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Mengni Ge,Zhuohui Jia,Quanguo Jiang,Guobing Ying,Yan Yang,Shaoyu Wu,Takashi Goto,Jianfeng Zhang
The development of highly-permeable reverse osmosis membranes has yet been pursued as a basis for efficient water purification/desalination. In this study, graphitic carbon nitride (g-C 3 N 4 ) nanomaterials with three structures, including one-dimensional (1D) g-C 3 N 4 nanorods , two-dimensional (2D) g-C 3 N 4 nanosheets and one/two-dimensional (1D/2D) g-C 3 N 4 nanohybrids were dispersed into polyamide layer for preparation of thin-film nanocomposite (TFN) membranes. The effects of different structures of g-C 3 N 4 nanomaterials on the microstructure and performance of membranes were investigated. Compared with polyamide membrane, 1D/2D nanohybrids incorporated TFN membrane had more open and larger nodular structures with abundant water channels. The surface roughness was decreased, the negativity and hydrophilicity were improved. The water permeability of resultant TFN membrane increased to 3.63 L·m −2 ·h −1 ·bar −1 for 2000 ppm NaCl brackish solution, 3.4 times that of PA membrane, with a high rejection of about 99.0 %. Even for 32,000 ppm NaCl solution, almost the same as the concentration of seawater, the water permeability of TFN membrane still maintained at 1.73 L·m −2 ·h −1 ·bar −1 , 1.4 times that of PA membrane. Meanwhile, antifouling performance of membranes was systematically analyzed under organic foulant, inorganic foulant and mixed organic-inorganic foulants, which proved the excellent antifouling performance of resultant TFN membranes. In a word, the 1D/2D nanohybrids incorporated TFN membrane exhibited superior permeability and antifouling performance to 1D nanorods or 2D nanosheets incorporated ones, confirming the effectiveness of 1D/2D g-C 3 N 4 nanohybrids for modification of reverse osmosis membrane and promising for more applications.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 6
·3017-3025
·
IF 3.925
Wen-Feng Wang,Li-Qi Qiu,Kai-Hong Chen,Hong-Ru Li,Lie-Feng Feng,Liang-Nian He
Photocatalytic CO2 reduction to valuable chemicals, especially fuels, is considered as a promising strategy to mitigate CO2 accumulation and tackle the energy crisis, among which photocatalysis is vital to achieve efficient and selective reduction of CO2. In this work, phosphorus-doped hollow polygonal g-C3N4 rods were prepared through phosphoric acid assisted self-assembly under hydrothermal conditions and subsequent thermal polymerization using phosphoric acid as the phosphorus source and melamine as the nitrogen-rich precursor. The resulting phosphorus-doped hollow polygonal g-C3N4 rods feature increased specific surface area, visible light absorption and photogenerated carrier separation and transfer efficiency according to the structure and photoelectric properties characterization. Coupled with an earth abundant metal-based complex, i.e. [Co(bpy)3]Cl2, as a co-catalyst, the phosphorus-doped hollow polygonal g-C3N4 rods deliver a CO evolution rate of up to 447.5 μmol g−1 h−1 with a selectivity of ca. 96%, being much higher compared to the pristine g-C3N4 (67.01 μmol g−1 h−1 with a selectivity of ca. 94%) resulting from the improved light harvesting and charge transfer to the co-catalyst. Remarkably, the phosphorus-doped hollow polygonal g-C3N4 rods can be reused 6 times while retaining constant catalytic activity in the photoreduction reaction. This work presents new insights into photocatalytic CO2 reduction by developing non-metal doping and hollow structural designs for semiconductor photocatalysts.
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高影响因子
CARBON
·
2022
·
IF 11.307
Yuanyuan Shao,Jundie Hu,Tingyu Yang,Xiaogang Yang,Jiafu Qu,Qi Xu,Chang Ming Li
Hydrogen peroxide (H 2 O 2 ) is an important green oxidant for environmental remediation. It is a sustainable strategy to realize solar-driven in- situ H 2 O 2 production for timely using via cascade reactions to sterilization or remove organic pollutants etc. However, how to improve the H 2 O 2 production and consumption abilities of catalysts are the two main challenges. Here we report a superior carbon-related ZnIn 2 S 4 /g-C 3 N 4 catalyst with excellent H 2 O 2 generation and consumption capabilities for efficient sterilization under visible light irradiation. The 2D/2D heterojunction of ZnIn 2 S 4 /g-C 3 N 4 with rapid carrier separation and transfer efficiency exhibits a remarkable H 2 O 2 yield of 4.27 mmol g −1 , which is much higher than that of current catalysts. The in- situ produced H 2 O 2 can be quickly activated to strong oxidizing hydroxyl radicals for sterilization, in which the Escherichia coli ( E. coli ) are fully cleared only within 25 min and 98% of Staphylococcus aureus ( S. aureus ) are killed out after 60 min irradiation. The prepared photocatalysts realize the rapid production and consumption of H 2 O 2 , and this work provides an effect green strategy for sterilization via the in- situ generated H 2 O 2 .
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高影响因子
NANO
·
2022
·
IF 1.438
Kaiyue Liang,Mingcai Yin,Yixian Li,Yaoting Fan,Zhongjun Li
CdS and MoS 2 are both promising photocatalytic materials for hydrogen production and lots of MoS 2 /CdS composites have been investigated. However, most of the previous work focused on relatively stable hexagonal CdS; researches on cubic CdS are still rare mainly due to its unstability. Then in this paper, a ternary composite MoS 2 /CN/CdS composed of cubic CdS, MoS 2 and graphitic carbon nitride (g-C 3 N 4 , abbreviated as CN) was prepared by simple in situ precipitation of cubic CdS on MoS 2 /CN at room temperature. Based on a series of characterizations, the photocatalytic hydrogen production performance of MoS 2 /CN/CdS was studied. The results showed that when the amount of MoS 2 /CN was 10 wt.%, the activity reached 1253.2 μ mol h − 1 , about 110 times that of pure CdS. Especially, its stability was investigated in detail by cyclic hydrogen production tests, which indicated that although the activity decreased after the first cycle, it was stable in the following three cycles mainly due to the existence of CN. Namely, a relatively stable and high performance cubic CdS-based ternary composite was achieved. This research can provide some new insights into the design of cubic CdS-based photocatalysts.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Jiaxin Xu,Xiuquan Lan,Jianhua Cheng,Xinhui Zhou
Water pollution , deriving from the contamination of pathogenic bacteria, has posed a threat to human's survival and development. Photocatalytic disinfection is being widely studied in decentralized drink water safety, as traditional disinfection technologies are limited by harmful disinfection by-product and excessive energy consumption. Herein, a novel composite membrane (PN/Ag) with plasmonic heterojunction was synthesized for the efficient photocatalytic disinfection through the combination of polyacrylonitrile (PAN), N -doped carbon dots (NCDs)/g-C 3 N 4 and Ag 2 C 2 O 4 by electrospinning technique and successive ionic layer adsorption and reaction (SILAR) process. The surface plasmon resonance (SPR) effect of Ag nanoparticles and Schottky barrier formation between metal and semiconductor contributed to the efficient separation of electron-hole pairs and the generation of reactive species, resulting in outstanding photocatalytic disinfection of PN/Ag composite membranes (7.48 and 7.70 log inactivation of E. coli and S. aureus respectively in 80 min) and good reusability under visible light illumination. Moreover, the potential Z-scheme photocatalytic mechanisms were proposed for PN/Ag system according to the band structure and reactive species analysis. The as-proposed PN/Ag composite membranes may shed light on the design and application of materials in water purification .
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高影响因子
危险品化学品经营许可证（带存储）