APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Lin Yang,Zhuo Li,Xiaoxiang Xu
With a light absorption up to 740 nm, BaNbO 2 N is promising for solar water splitting but normally owns a low activity due to a high defect concentration. Here, Mg is adopted as a dopant to modify the BaNbO 2 N. The presence of Mg not only reduces the defect concentration and enhances surface hydrophilicity but also tunes the bandgap as well as the band edge positions. These modifications greatly promote the charge separation and transfer of BaNbO 2 N, boosting the photocatalytic activities for O 2 -evolution reactions. An apparent quantum efficiency of 1.65 % at 420 ± 20 nm has been attained for Mg modified BaNbO 2 N. Overall water splitting at a stable gas-evolution rate (∼ 2.0 μmol·h −1 for H 2 and ∼ 1.0 μmol·h −1 for O 2 ) has been realized by integrating Mg-modified BaNbO 2 N into a Z-scheme system. These findings justify Mg as an effective dopant to modulate the photocatalytic behavior of Nb-based perovskite oxynitrides.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2023
·
IF 2.2
Yuxin Sun,Ye Li,Jiajia He,Liuyun Chen,Hongbing Ji,Zuzeng Qin,Tongming Su
Ternary sulfide solid solutions have garnered great attention in photocatalytic water splitting due to their tunable electronic property, low cost, and sufficient light-absorption performance. Herein, a series of Mn x Cd 1 – x S samples with different Mn/Cd molar ratios were synthesized by solvothermal method and used for photocatalytic hydrogen production under visible light. The Mn 0.2 Cd 0.8 S and Mn 0.4 Cd 0.6 S are demonstrated to be the solid solutions, while Mn 0.6 Cd 0.4 S and Mn 0.8 Cd 0.2 S consist of Mn x Cd 1 – x S solid solution and MnS. In addition, the Mn 0.4 Cd 0.6 S exhibits the highest photocatalytic performance with the H 2 production rate of 185.95 μmol·h −1 , which is 4.7 times higher than that of CdS. Without cocatalyst, the quantum efficiency of Mn 0.4 Cd 0.6 S reaches 2.04% at 400 nm. In addition, the Mn 0.4 Cd 0.6 S solid solution also shows high stability during the photocatalytic H 2 production reaction. The effect of Mn/Cd molar ratio on the microstructure, band gap structure, and photocatalytic hydrogen production performance of Mn x Cd 1– x S was revealed systematically. The excellent photocatalytic H 2 production performance of Mn 0.4 Cd 0.6 S solid solution is mainly due to its enhanced reducing potential and high charge separation efficiency.
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WATER RESEARCH
·
2023
·
IF 12.8
Tao Yang,Cui Huang,Linqian An,Ge Zeng,Juan Li,Changyu Liu,Xiaolong Xu,Jianbo Jia,Jun Ma
Hexavalent chromium (Cr(VI)) is ubiquitous in natural environments, whereas its role in the transformation of coexisting contaminants may have been overlooked. In this work, it was reported for the first time that the irradiation of Cr(VI) by solar light (solar light/Cr(VI) system) could effectively degrade various micropollutants with different structures. The removal efficiency of selected micropollutants was increased by 13.3–64.8% by the solar light/Cr(VI) system compared to that by direct solar photolysis. Meanwhile, the oxidation rates were enhanced by 2.2–21.5 folds, while they were negligible by Cr(VI) oxidation alone. Experiments by specific scavengers, probe compounds, fluorescence absorbance, and electron spin resonance analysis demonstrated that hydroxyl radical (•OH) was the major reactive species in the solar light/Cr(VI) system. Further experiments showed that the generation of •OH was closely related to the intermediate Cr(V) generated from Cr(VI) reduction, and Cr(V) could be re-oxidized back to Cr(VI). Increasing solution pH negatively affected model micropollutant (carbamazepine (CBZ)) degradation by the solar light/Cr(VI) system, mainly due to the decreased quantum yield of •OH at higher pH. Coexisting sulfate ions showed negligible effect on CBZ degradation in the solar light/Cr(VI) system, while the presence of bicarbonate , chloride, and humic acid inhibited CBZ degradation to varying degrees, owing to their diverse scavenging effects on •OH. Furthermore, moderate CBZ degradation was also achieved by natural solar light photolysis of Cr(VI). This study demonstrated the pivotal role of Cr(VI) in the transformation of micropollutants under solar irradiation, which advances the understanding of the fate of micropollutants in natural environments.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
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IF 7.2
Chenmei Gao,Yu Xie,Yong Chen,Yun Ling,Yongcun Ma,Yifan Zhang,Yi Shao
One of the major challenges in photocatalytic hydrogen production is to improve the separation efficiency of photo-generated carriers. Therefore, we prepared ZIS/BMO heterojunctions by hydrothermal method to promote the directional separation of photogenerated carriers. A series of characterization results show that the successful preparation of heterojunctions substantially increases the separation and transfer rate of photogenerated carriers. 11% ZIS/BMO had the highest photocatalytic hydrogen production performance reached 1502.6 μmol/g/h, which is 2.78 times than ZIS monomer . Simple construction of heterojunctions but dramatic improvement of photocatalytic hydrogen production performance opens up new horizons for photocatalyst modification.
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Polymers
·
2023
·Vol. 15
·期 9
·2076
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IF 5
Hongping Zhang,Pengfei Tang,Youhong Tang,Kun Yang,Qingyuan Wang
The penetration of external stimuli (microorganisms, ions, etc.) following to the pore is the key reason for the deterioration of cement and concrete structures. Although the traditional methods such as improving the chemical composition of cement and concrete materials can delay the erosion rate, the inevitable pore structure still makes its deterioration a challenge. Based on this, we reported a protective coating for cementitious materials based on phenol and Ti3C2MXene-modified polyacrylate (MXene-PG/PA). The introduction of phenols enhanced the waterproof properties of polyacrylate by increasing the interaction among molecular chains. Moreover, the introduction of Ti3C2MXene also endows the MXene-PG/PA coating with good light-induced antimicrobial properties. Beneficial to these designs, the MXene-PG/PA coating exhibited good waterproof properties (the water absorption ratio in seawater decreased by 58.2%) and antimicrobial properties (inhibition ofE. coliandS. epidermidisactivity under light). These results not only confirm that the MXene-PG/PA coating is a potential candidate of protective coating for cement-based materials, but also provide a new strategy for the design of multifunctional protective coatings.Keywords:protection coating;Ti3C2MXene;waterproof;antimicrobial;cement-based materials
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ACS Nano
·
2023
·
IF 17.1
Jie Guo,Min Lu,Xiaoyu Zhang,Siqi Sun,Ce Han,Yu Zhang,Xuyong Yang,Stephen V. Kershaw,Weitao Zheng,Andrey L. Rogach
Orthorhombic γ-CsPbI3 possesses the highest structural stability among the optically active (light-emissive) CsPbI3 perovskites. Here, we make use of a seed-assisted heteroepitaxial growth to fabricate seed/core/shell CaIx/γ-CsPbI3/CaI2 nanocrystals. Ultrasmall CaIx nanoparticles serve as seeds to template the Pb-centered octahedral arrangement which enables the formation of the γ-CsPbI3 phase and at the same time inhibit lattice strain by blocking the force transfer that otherwise leads to an octahedral twist and so improve the structural stability of the resulting nanocrystals. An outer shell composed from the same material, CaI2, isolates the formed γ-CsPbI3 nanocrystals from the environment, which also significantly improves their stability under ambient conditions. Optical and electrical studies indicate that the seed/core/shell CaIx/γ-CsPbI3/CaI2 structure possesses a shallower set of trap states as compared to cubic α-CsPbI3 nanocrystals. Light-emitting diodes utilizing these γ-CsPbI3 nanocrystals show a record high external quantum efficiency of 25.3%, high brightness of over 13600 cd/m2, and an operational lifetime of ∼14 h before reaching 50% of their initial luminance. These devices can repeatedly be illuminated over 650 times at ∼500 cd/m2 with no decline of brightness, which indicates their great commercial potential.
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Polymers
·
2023
·Vol. 15
·期 10
·2347
·
IF 5
Shengyun Jiang,Mingshan Yin,Huixue Ren,Yaping Qin,Weiliang Wang,Quanyong Wang,Xuemei Li
Microplastics (MPs) in the water system could easily enter the human body and pose a potential threat, so finding a green and effective solution remains a great challenge. At present, the advanced oxidation technology represented by photocatalysis has been proven to be effective in the removal of organic pollutants, making it a feasible method to solve the problem of MP pollution. In this study, the photocatalytic degradation of typical MP polystyrene (PS) and polyethylene (PE) by a new quaternary layered double hydroxide composite photomaterial CuMgAlTi-R400 was tested under visible light irradiation. After 300 h of visible light irradiation, the average particle size of PS decreased by 54.2% compared with the initial average particle size. The smaller the particle size, the higher the degradation efficiency. The degradation pathway and mechanism of MPs were also studied by GC–MS, which showed that PS and PE produced hydroxyl and carbonyl intermediates in the process of photodegradation. This study demonstrated a green, economical, and effective strategy for the control of MPs in water.Keywords:microplastics;photocatalysis;polystyrene;polyethylene;layered double hydroxide
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 11
·9378
·
IF 5.6
Xiaoyu Jiang,Qin Zhou,Yongfu Lian
In this work, the MnFe2O4/BGA (boron-doped graphene aerogel) composite prepared via the solvothermal method is applied as a photocatalyst to the degradation of tetracycline in the presence of peroxymonosulfate. The composite’s phase composition, morphology, valence state of elements, defect and pore structure were analyzed by XRD, SEM/TEM, XPS, Raman scattering and N2adsorption–desorption isotherms, respectively. Under the radiation of visible light, the experimental parameters, including the ratio of BGA to MnFe2O4, the dosages of MnFe2O4/BGA and PMS, and the initial pH and tetracycline concentration were optimized in line with the degradation of tetracycline. Under the optimized conditions, the degradation rate of tetracycline reached 92.15% within 60 min, whereas the degradation rate constant on MnFe2O4/BGA remained 4.1 × 10−2min−1, which was 1.93 and 1.56 times of those on BGA and MnFe2O4, respectively. The largely enhanced photocatalytic activity of the MnFe2O4/BGA composite over MnFe2O4and BGA could be ascribed to the formation of type I heterojunction on the interfaces of BGA and MnFe2O4, which leads to the efficient transfer and separation of photogenerated charge carriers. Transient photocurrent response and electrochemical impedance spectroscopy tests offered solid support to this assumption. In line with the active species trapping experiments, SO4•−and O2•−radicals are confirmed to play crucial roles in the rapid and efficient degradation of tetracycline, and accordingly, a photodegradation mechanism for the degradation of tetracycline on MnFe2O4/BGA is proposed.
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Molecular Catalysis
·
2023
·
IF 4.6
Hele Liu,Pengfei Tan,Lu Yang,Mingyuan Zhang,Jiaoyang Chen,Ruifeng Ren,Huanhuan Zhai,Tiangui Qi,Jun Pan
Improving photocatalytic activity is crucial for promoting photocatalytic hydrogen production. Element doping is a feasible strategy to accelerate carrier separation and migration rate. Herein, a simple one-pot hydrothermal process was used to create In doped Sn 3 O 4 composite photocatalyst. It was demonstrated that the addition of In considerably raises the concentration of oxygen vacancy , which provides more unsaturated active sites, thus regulating the photocatalyst's electronic structure and surface properties, and promoting the carrier migration efficiency. Meanwhile, the light absorption range of samples after doping is redshifted, and the light absorption capacity is enhanced, which effectively improves the photocatalytic activity. Due to this, the optimal sample's average hydrogen production under visible light reached 22.83 μmol g −1 h −1 , 4.5 folds more than that of Sn 3 O 4 , and shown good stability. This research presents a novel approach for the development of metal oxide photocatalyst with excellent activity and durability.
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Materials Today Communications
·
2023
·
IF 3.8
Fenting Yu,Beiyang Guo,Yuan Zhuang,Sridhar Komarneni,Jianfeng Ma
The ZnFe 2 O 4 -Bi 2 MoO 6 composite photocatalyst was applied to construct a persulfate activation system combined with photocatalysis . The composite material was synthesized by a simple hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy (UV-Vis DRS) to study the phase formation, morphology, valence state of elements and light absorption property, respectively. The experimental results showed that the degradation efficiency of tetracycline can reach 84 % in 40 min under visible light, with K 2 S 2 O 8 as the co-catalyst. The principal advantage of this system is that it can be applied to a wide pH range (3−11) with negligible influence. This system is also less affected by anions (HCO 3 2- , NO 3 - , Cl - ,) and humic acid (HA). The excellent catalytic performance may be due to the retention of electron hole pairs with high redox ability after the construction of heterojunction and the formation of active radicals, O 2 •- , SO 4 •- and •OH. In addition, the ZnFe 2 O 4 /Bi 2 MoO 6 composite catalyst showed good stability and recyclability.
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ACS Applied Bio Materials
·
2023
·
IF 4.7
Tao Tang,Chang Liu,Zeqi Min,Wenjing Cai,Xiacong Zhang,Wen Li,Afang Zhang
Gelatin-based microgels are intriguing for various biomedical applications, which are conventionally prepared through photopolymerization of gelatin methacrylamide (GelMA). Here, we report on the modification of gelatin through acrylamidation to form gelatin acrylamide (GelA) with different substitution degrees, which was found to exhibit fast photopolymerization kinetics, better gelation, steady viscosity at elevated temperatures, and satisfying biocompatibility when compared to GelMA. By the online photopolymerization strategy with a home-made microfluidic setting, microgels of uniform sizes from GelA by blue light were obtained and their swollen properties were investigated. Compared to the microgels from GelMA, they showed an enhanced cross-linking degree and have better shape stability when swollen in water. Cell toxicities of the hydrogels from GelA and cell encapsulation from the corresponding microgels were investigated, which were found to exhibit superior properties than those from GelMA. We therefore believe that GelA has potential for constructing scaffolds for bioapplications and can be an excellent substitute for GelMA.
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MRS Communications
·
2023
·Vol. 13
·期 4
·538-545
·
IF 1.9
Yin Jinkun,Chu Yaoqing,Tan Lianjiang
Cu/N co-doped TiO 2 nanopowder was prepared with a facile sol–gel method. In the absence of stabilizing agents, the co-doped nanopowder with nanoscaled particle sizes was obtained. Doping didn’t change the anatase crystal structure of TiO 2 . Cuprite Cu 2 Cl(OH) 3 formed in the co-doped nanopowder. Based on ultraviolet–visible (UV–vis) spectroscopy and X-ray photoelectron spectroscopy (XPS) data, the mechanisms of significantly improved photocatalytic activity of the co-doped nanopowder were discussed. The antibacterial evaluation and cytotoxicity test suggested the nanopowder inhibited bacteria significantly under visible light and had ultralow cytotoxicity. This work provided a promising antibacterial agent with potential biomedical applications.
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危险品化学品经营许可证（带存储）