CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiren Yuan,Hu Zhou,Dan Li,Feigao Xu
To perfect the photocatalytic performance of Fe 3 S 4 under visible light irradiation using tetracycline hydrochloride (TCH) as a target contaminant, magnetic Fe 3 S 4 /g-C 3 N 4 composites with a visible light response were synthesized by a one-step hydrothermal method . The effects of varying quality ratios, temperatures, pH value, and H 2 O 2 concentrations on photocatalysis was investigated, and the composites were characterized by XRD , FTIR, XPS, SEM, etc. The results show that the highest photo-Fenton catalytic efficiency is obtained for a composite with a Fe 3 S 4 to g-C 3 N 4 quality ratio of is 1:0.75 (Fe 1 C 0.75 ). More than 97.5% of TCH is removed by Fe 3 S 4 /g-C 3 N 4 /H 2 O 2 within 60 min under visible light irradiation and near-neutral conditions (pH 6.2), and its first-order kinetic constant is determined to be 0.06802 min −1 . The removal efficiency for Fe 3 S 4 /g-C 3 N 4 is 1.61 and 13.34 times higher than that of the parent Fe 3 S 4 and g-C 3 N 4 , respectively. At this time, g-C 3 N 4 can effectively increase the leaching of S 0 . The effects of different active species in the TCH degradation experiment with the Fe 1 C 0.75 composite were studied, and it is found that h + , · O 2 − , and ·OH radicals are the main substances involved in the degradation of TCH. The synthesized Fe 3 S 4 /g-C 3 N 4 catalyst is a promising heterogeneous photo-Fenton catalyst for the removal of organic pollutants.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 34
·期 4
·1087-1105
·
IF 3.348
Tengfei Shao,Weijun Zhen,Junwu Chen
The g-titania functional additives were prepared via thiol-ene click chemical reaction, and then the polylactic acid/g-titania nanofiber membrane was prepared via electrospinning technology. Characterization via scanning electron microscopy and nitrogen adsorption/desorption showed that the average fiber diameter of the TP4 fiber membrane was 489 nm, the specific surface area was 34.69 m 2 ·g −1 , and the average pore size was 22.31 nm. The adsorption mechanism, photocatalytic degradation performance, and reusability of polylactic acid/g-titania nanofibrous membranes were characterized. The results showed that the adsorption of methylene blue by TP4 nanofiber membrane followed a pseudo-second-order kinetic model, which could be represented by the Langmuir isotherm model, and the maximum adsorption capacity was 35.44 mg·g −1 . In addition, the photocatalytic degradation of methylene blue by TP4 nanofiber membrane followed a first-order kinetic model and exhibited high reusability. Therefore, polylactic acid/g-titania nanofiber membrane, as an efficient dye removal material, shows a good application prospect in wastewater treatment.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Guowen Qian,Tianci Wen,Yang Shuai,Xiongting Wu,Zhikui Zeng,Shuping Peng,Cijun Shuai
Photodynamic antimicrobial therapy via producing ROS based on light-responsive nanoparticles has attracted worldwide attention because of the high selectivity and low side effects. However, biofilms and bacterial membranes provide a natural barrier to prevent the penetration of ROS, which impairs the photodynamic antibacterial efficiency of nanoparticles. Photothermal therapy is an effective strategy against biofilms and bacterial membranes because high temperature can destroy the biofilm structure and enhance the membrane permeability. Herein, Bi2S3 nanorods were anchored on the surface of zinc-doped g-C3N4 (ZnCN) nanosheets to construct a ZnCN-Bi2S3 nanocomposite; then, it was incorporated into poly-l-lactic acid and prepared into scaffolds by the selective laser sintering technology. Bi2S3 nanorods not only endowed the scaffold with an excellent photothermal property but also strengthened the photodynamic effect of ZnCN nanosheets after forming the nanocomposite. The results showed that this nanocomposite had a lower recombination rate of photogenerated electron–hole pairs and produced higher photocurrent compared to those of the g-C3N4 nanosheets and Bi2S3 nanorods. The scaffold destroyed the biofilm and elevated the bacterial membrane permeability significantly and finally achieved 98.5% antibacterial rate for Staphylococcus aureus and 96.3% antibacterial rate for Pseudomonas aeruginosa. Encouragingly, the scaffold could also promote chondrogenic differentiation because of the continuous release of Zn ions. The scaffold containing ZnCN-Bi2S3 nanocomposites possessed excellent antimicrobial and cartilage regeneration functions, which displayed great potential in treating tracheal injuries.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xiaoyu Yang,Boming Tang,Xuejuan Cao
Continuous photocatalysis is achieved by using light-storing assisted photocatalytic composites, but little is known about the interactions between photocatalysts and long afterglow materials. g-C 3 N 4 /Sr 2 MgSi 2 O 7 :(Eu,Dy) with a sustained reaction activity was prepared by pyrolysis polymerization, and its optical-photocatalysis behaviors were studied. It was found that the light absorption ability and NO removal effect were improved, but the luminescence-afterglow performance became worse. The interface model of g-C 3 N 4 /Sr 2 MgSi 2 O 7 :(Eu,Dy) was constructed for the first time. On the basis of experimental analyses, its electronic structure and carrier transfer paths were studied by First-principles calculations, and reasons behind the changes in macro performance were revealed. The results showed that Eu 4 f electrons are difficult to return to the Eu 5d orbits after being captured by C 2p orbits, leading to the reduction of light energy radiation; the built-in electric field and energy band offsets between g-C 3 N 4 and Sr 2 MgSi 2 O 7 :(Eu,Dy) promote the transfer of photoinduced carriers, which follows a traditional type-II mechanism, resulting in enhanced photocatalytic activity and decreased luminescence-afterglow performance. This paper reveals the relationship between optical-photocatalysis behaviors and the electronic structure of g-C 3 N 4 /Sr 2 MgSi 2 O 7 :(Eu,Dy). It provides a reference for designing and optimizing light-storing assisted photocatalytic composites.
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CARBON
·
2022
·
IF 11.307
Zhiwei Zhang,Jingqi Chen,Xuetao Yan,Xiaowei Liu,Yingying Chen,Chuanqi Zhao,Lingyan Feng
Carbon dots (CDs) due to their excellent photostability, good biocompatibility and multicolor fluorescence, have been preferentially selected as luminescent fluorophores and co-assembled with various chiral host templates in recent years. The as-prepared composites exhibit marvellous circularly polarized luminescence (CPL) activity and show promising potentials in the fields of stereopsis and optoelectronic display, which have drawn increasing attention. However, the fussy assembly procedure and over-reliance on template chirality extremely limit the design and application of CDs-composited materials in the field of CPL. In this work, we directly prepared the CDs-composited G-quartet hydrogels with CPL activity using a one-step microwave-assisted method, and their helical chiral structure and CPL orientation can be arbitrarily switched back and forth between left-handed and right-handed through K + and formation kinetics. Finally, the CDs-composited G-quartet hydrogels can be applied in anti-counterfeiting printing for encrypted information transfer, and their outstanding thermal cycling stability and CPL dissymmetry factor (g lum ) of up to 10 −1 demonstrate a wider application potential in CPL active materials based on CDs.
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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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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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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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高影响因子
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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