CRYSTAL GROWTH & DESIGN
·
2020
·
IF 4.089
Hao Wu,Jingkang Wang,Qi Liu,Shuyi Zong,Beiqian Tian,Xin Huang,Ting Wang,Qiuxiang Yin,Hongxun Hao
Effectively manipulating crystal nucleation and growth is an essential issue for controlling the crystal morphology. In this work, the effect of additives on promoting crystal nucleation and growth was investigated from both thermodynamic and kinetic perspectives by using p-methylacetanilide as the model compound. Two additives with amide-terminal and halogen-terminal were selected, and it was found that they can promote the nucleation and crystal growth of p-methylacetanilide. It was found that the existence of 4-bromoacetanilide or 4-chloroacetanilide could decrease the solubility and the interfacial energy of p-methylacetanilide in ethanol, thus leading to an easier nucleation process. Furthermore, by measuring the growth rates of the (1 1 0) and (0 1̅ 1) faces of p-methylacetanilide in the absence and presence of additives, it was found that the raised supersaturation was not the only factor for crystal growth intensification. Molecular simulations revealed that the promotion effect was because the amide-terminal of additives bring the halogen-terminal to the proximity of the p-methylacetanilide surface and disrupt the absorbed ethanol layer, thus eliminating the negative influence of solvent on the surface diffusion of p-methylacetanilide.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Mei Dong,Wenjun Li,Liang Geng,Ruixue Huang,Yuan Liu,Hongli Han
Herein, CuCo 2 O 4 hollow porous nanospheres (HPN), nanosheets (NS), and nanowires (NW) were synthesized via solvothermal and calcination processes, and were used to construct efficient heterojunctions with Cd 0.5 Zn 0.5 S. Interestingly, the unique hollow porous structure exhibits enhanced light absorption, large pore diameter (12.57 nm), and strong hydrophilicity (10.05°). Photocatalytic results indicate that CuCo 2 O 4 HPN/Cd 0.5 Zn 0.5 S achieves the optimal hydrogen production rate, which is 5.4, 1.2, and 1.3 times than that of pure Cd 0.5 Zn 0.5 S, CuCo 2 O 4 NW/Cd 0.5 Zn 0.5 S and CuCo 2 O 4 NS/Cd 0.5 Zn 0.5 S, respectively. High-resolution TEM and theoretical calculations confirm that (311)/(111) facet junctions in CuCo 2 O 4 nanospheres form a work function difference (0.24 eV), which significantly facilitates charge transfer and separation. Mott-Schottky and Ultraviolet photoelectron spectroscopy analyses indicate that p-type CuCo 2 O 4 and n-type Cd 0.5 Zn 0.5 S have staggered energy levels and a distinct Fermi level difference (1.85 eV), which leads to rearrangement of the Fermi energy level and modulation of charge transfer pathway. The resulting energy band bending and built-in electric field promote charge transfer at the heterojunction interface more effectively. The synergistic mechanism of the facet junction and p-n junction finally achieves high-efficiency hydrogen production. This work provides new insights into how to construct efficient p-n heterojunction photocatalysts and presents the synergistic mechanism of facet junction and p-n junction.
研究领域:
材料科学
·
能源科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2013
·Vol. 5
·期 20
·9764-9772
·
IF 6.233
Dongfang Hou,Xianluo Hu,Pei Hu,Wei Zhang,Mingfei Zhang,Yunhui Huang
A novel p–n junction photocatalyst of Bi4Ti3O12 nanofibers–BiOI nanosheets has been fabricated through a simple and economical technique of electrospinning combined with a successive ionic layer adsorption and reaction (SILAR) process. The products are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectra (DRS), and photoluminescence (PL) spectroscopy. The as-formed Bi4Ti3O12 nanofibers are composed of inter-linked nanoparticles of 50–80 nm in size. The thickness of the as-grown BiOI nanosheets is about 10 nm and the size of the BiOI nanosheets increases with the SILAR cycles. In particular, many {001} facets of BiOI nanosheets are exposed, which is favorable to enhance the visible-light photocatalytic activity. The p–n junction photocatalyst exhibits enhanced visible-light-driven photocatalytic activity for decomposition of rhodamine B (RhB) and phenol. The enhanced photocatalytic activity can be attributed to the extended absorption in the visible light region resulting from the BiOI nanosheets and the effective separation of photogenerated carriers driven by the photo-induced potential difference generated at the Bi4Ti3O12–BiOI p–n junction interface.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2025
·
IF 17.1
Zongnuo Sha,Cheng Hu,Shuchen Tu,Tong Li,Fang Chen,Hongwei Huang
Solar catalysis efficiency is severely subject to the insufficient charge separation and inactive surface sites. Building piezoelectric field is established to be effective for anisotropic photocharge separation, and introducing defects can enrich surface reactive sites. However, the relationship between piezoelectric field and surface defect or reaction kinetics remains unclear. Herein, we report piezo-activating oxygen vacancy (OVs) to regulate quantum well effect and p-band center for exceptional photocatalysis in polar BiOIO 3 single crystals. The introduction of piezoelectric field enhances the local charge asymmetry distribution induced by OVs, facilitating electron donating from bulk to surface I atom. Remarkably, the external strain collaborates with OVs to largely reduces the work function of its surface, and induces a larger up-shift of p-band center of I 5p orbitals in BiOIO 3 . It indicates a reduction in the occupancy of antibonding-orbital, facilitating the stabilization of O 2p antibonding states and formation of I-O ads bonds for strong O 2 /H 2 O adsorption. Thus, oxygen-vacant BiOIO 3 achieves a dramatically improved piezo-photocatalytic degradation efficiency towards various pollutants, outperforming the related piezo-photocatalysts in previous reports. This work reveals the mechanism of piezoelectric field on surface vacancy and surface electronic structure at the atomic level.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2021
·
IF 8.207
Dashui Yuan,Zongyuan Li,Xueru Chen,Jing Ding,Hui Wan,Guofeng Guan
Proper interface and band alignment always play essential roles in the separation of photoexcited charge of photocatalysts. In this work, we prepared a homodispersed S-scheme carbon nitride homojunction with local electron structure difference by a facile pre-doping and two-step calcination approach. Boron doping into heptazine created extra acceptor impurity, and phosphorus doping into heptazine created extra donor impurity, which eventually modulated the electronic structure of carbon nitride. As heptazines with different element doping were integrated into carbon nitride by recalcination, B–CN and P–CN formed a homodispersed homojunction and thus produced a rich interface. Meanwhile, caused by Fermi energy levels equilibrium, the band bending constructed an S-scheme homojunction, which stimulated photogenerated electrons to transfer from CB of B–CN to VB of P–CN. The homodispersed S-scheme homojunction structure led to efficient suppression of recombination of photoinduced charge and retained stronger redox charge. Consequently, the photocatalytic performance was dramatically boosted to 2620 μmol g −1 from 60 μmol g −1 of pure CN in 4-h hydrogen evolution from water. This novel method for electron structure engineering helped to provide a new strategy for designing homojunction photocatalysts with excellent photocatalytic performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 22
·1-21
·
IF 2.8
Nazir Ahsan,Huo Pengwei,Jagirani Muhammad Saqaf,Akram Muhammad Yasir,Wang Huijie
In this study, a plasmonic p–n heterojunction Ag@Ag 2 O–BiVO 4 photocatalyst was successfully prepared by a simple chemical precipitation-reduction process. The obtained samples were tested by various measurements and the photocatalytic behavior in the decomposition of tetracycline (TC) under irradiation with visible light was studied. The photodegradation study exhibits that Ag@Ag 2 O–BiVO 4 has the optimum activity and can efficiently degrade 83.52% of TC in 60 min by irradiation with visible light. Furthermore, the Ag@Ag 2 O–BiVO 4 exhibited more pronounced visible light absorption and the best performances than the BiVO 4 and Ag 2 O–BiVO 4 , which was mainly due to the LSPR of plasmonic Ag. The experimental radical trapping proved that the active species of the photocatalytic process act in the following order: ·O 2 − > h + > · OH. To find intermediates, the possible TC degradation pathways via HPLC–MS were also investigated. This research provides a successful method to develop a plasmonic photocatalyst with p–n heterojunction for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Linjuan Wang,Siva Krishna Karuturi,Ling Zan
We present one-pot hydrothemal syntheis of SnS 2 -In 2 S 3 p-n heterostructures for photocatalytic reduction of Cr 6+ to Cr 3+ . The conduction bands of In 2 S 3 and SnS 2 serve as the photogenerated electron donors and acceptors, respectively, forming a p-n junction band alignment improving the photogenerated charge separation efficiency. Through a detailed investigation of photocurrent spectra, photoluminescence spectra and electrochemical impedance, the heterojunction formation is shown to enhance the photogenerated charge separation and transport properties. In addition, the analysis of 5,5-Dimethyl-1-pyrroline N-oxide (DMPO) spin trapping electron spin resonance (ESR) spectra and band structure further testify the p-n junction of the composite catalyst that could accelerate the electron transport and change the pathway of photocatalytic process toward Cr 6+ reduction. Furthermore, SnS 2 -In 2 S 3 heterojunction photocatalyst achieved 3 times and 67 times higher efficiency than pure In 2 S 3 and SnS 2 photocatalysts under visible light toward Cr 6+ reduction. Moreover, the SnS 2 -In 2 S 3 p-n heterojunction photocatalyst demonstrates Cr 6+ removal in a weak alkaline solution, breaking through the challenge of Cr 6+ reduction in an alkaline environment.
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 4
·1051-1065
·
IF 2.747
Guo Yan,Li Zhuang,Wei Yuxi,Zhang Xinxu,Shi Kexin
Polyvinylpyrrolidone (PVP) and graphene (G)-modified iron oxides (Fe 2 O 3 -PVP-G) are prepared by a simple hydrothermal reaction. Their morphology and structure were examined and proved by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible diffuse reflectance spectroscopy. P-nitrophenol (p-NP) is a usual organic pollutant, which is highly toxic and difficult to decompose. Electrochemical reduction of p-NP is a widely used treatment, but the reduction products are still toxic. In this work, the electrochemical catalytic oxidation of p-NP was achieved on Fe 2 O 3 -PVP-G modified electrodes. Compared to pure Fe 2 O 3 , Fe 2 O 3 -PVP-G shows better catalytic performance, with a current density 10.4 times larger than that from Fe 2 O 3 . Electrochemical results verify that the improvement comes from the promotion of its activity and the favorable enrichment of p-NP with the help of the doped PVP and G. pH experiments indicate that p-NP is oxidized to aliphatic acid, which is non-toxic and environmentally friendly. Due to the protection of organic molecules, Fe 2 O 3 -PVP-G exhibits long-term stabilities on electrochemical oxidation on p-NP with the retention of 88.5% for 15 days. Our results also provide another perspective for studying electrocatalytic performances.
研究领域:
环境科学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Bowen Wu,Yixi Chen,Mingtai Liu,Yi Tang,Gengfeng Zheng,Linping Qian
The surface properties of CoMg/Al 2 O 3 were evaluated in the aerobic oxidation of p -cresol. The surface interaction is enhanced greatly after Co and Mg impregnation with the mole ratio of Co/Mg from 2 : 1 and 2 : 3. The strongest interaction for the nonpolarity and benzene ring was found on CoMg/Al 2 O 3 with Co/Mg of 2 : 3. But for the interaction with p -π group bonding with negative anion, the highest value appears on the catalyst with the Co/Mg of 2 : 2. In aerobic oxidation of p -cresol, the conversion is significantly increased with Co addition and reaches around 60 % after 24 h' reaction at 338 K. The highest selectivity of p -hydroxybenzaldehyde of 99 % is achieved on Al 2 O 3 with the co-impregnation mole ratio of Co/Mg of 2 : 2. It is suggested that medium adsorption of the reactants and strong stabilization of the intermediates facilitate the aerobic oxidation of p -cresol to p -hydroxybenzaldehyde.
研究领域:
催化化学
·
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2021
·
IF 6.025
Yajing Fang,Fuqiang Liang,Mengmeng Xia,Weiwei Cao,Siyi Pan,Ting Wu,Xiaoyun Xu
This study was aimed to investigate the inhibitory activity of flavonoids on P-glycoprotein (P-gp). Effects of 39 flavonoids on the cellular uptake (CU) of rhodamine123 (Rho) and daunomycin (DNR) were investigated in both parental KB and P-gp overexpressed KB/MDR cells. The inhibition mechanism of selected flavonoids was further investigated by measuring the ATPase activity and expression level of P-gp. Twelve flavonoids improved the uptake of Rho (↑Rho F ) and nineteen flavonoids increased the uptake of DNR (↑DNR F ) in KB/MDR cells with nine flavonoids overlapped. Structure-activity relationship (SAR) indicated that 8-OCH 3 , and 2′-OH have a negative effect on Rho and DNR transport. Whereas 5-OH, 5-OCH 3 , 6-OH, 7-OCH 3 , 3′-OH, and 4′-OH, are essential for inhibition of flavonoids on P-gp and reversing the resistance of Rho and DNR. Eleven selected flavonoids significantly induced the basal P-gp-ATPase activity but much lower than that induced by verapamil . Tangeretin , galangin , kaempferol , quercetin , and morin significantly reversed the ATPase activity stimulated by verapamil. Six of eleven flavonoids significantly decreased P-gp expression, whereas three flavonoids slightly increased P-gp expression. These results provide valuable information that flavonoids can effectively reverse multidrug resistance of P-gp-mediated transport of nutraceutical and drugs by co-administration.
研究领域:
药理学
·
肿瘤学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MONATSHEFTE FUR CHEMIE
·
2020
·Vol. 151
·期 1
·99-106
·
IF 1.349
Li Nutao,Chen Feng,Wang Guanghui,Zeng Qingle
Abstract A ligand-free copper-catalyzed C–P cross-coupling reaction of arylmethyl quaternary ammonium salts and diarylphosphine oxides in air is developed. Arylmethyl quaternary ammonium salts with various functional groups and a variety of dialkyl- and diarylphosphine oxides afford C–P cross-coupling products with good yields. This protocol requires no inert atmosphere, no ligand, and simple operation steps. Graphic abstract
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ke Lu,Mingyue Xia,Chaojun Chen,Hao Yuan,Jianping Liang,Hongli Wang,Zhi Zheng,Qinghua Liu,Junfeng Gao,Dezheng Yang
Plasma-synergistic catalysis is considered an effective method for degrading aromatic organic pollutants in water. However, the underlying synergistic catalytic mechanism between plasma and catalysts remains poorly understood. Here, we propose a plasma-metal organic frameworks (MOFs) synergistic strategy to investigate the mechanism of plasma-synergistic catalysts for phenol degradation. The results show that Fe-doped Zeolitic Imidazolate Framework-8 (Fe x -ZIF8, x = 0, 0.1, 0.2, 0.4) undergoes the plasma-induced transformation into an Fe-N 3 C structure (P-Fe-N 3 C), leading to a 4.5-fold enhancement in the phenol degradation rate compared to only plasma discharge. Density functional theory (DFT) calculations indicate that the plasma-induced structural transformation of Fe x -ZIF8 promotes the redistribution of point charges and space charges around the Fe center, thereby lowering the activation energy barrier in the rate-determining step (*C 6 H 4 (OH) 2 ). These findings not only provide theoretical support for the degradation of water pollutants via plasma-synergistic catalysts but also offer a novel strategy for constructing MOFs-derived materials.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）