JOURNAL OF MATERIALS SCIENCE
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2023
·Vol. 58
·期 31
·12596-12610
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IF 4.5
Liu Jun,Wang Hui,Chang Meng-Jie,Li Wen-Juan,Bai Ge,Xie Heng-Xue,Li Xin,Du Hui-Ling,Song Shi-Jie
MIL-100(Fe) has been demonstrated as a commonly used photocatalyst but is limited by the deficient charge separation efficiency and difficult recovery. In this work, by taking advantages of the strong plasmonic absorption and electron conductivity of Ag nanoparticles, as well as the fast magnetic response of the Fe 3 O 4 , core/shell Ag/Fe 3 O 4 @MIL-100(Fe) (AFM) was facilely prepared by a direct hydrothermal reaction between H 3 btc and Ag/Fe 3 O 4 (AF) for photo-Fenton degradation of RhB assisted by H 2 O 2 . Specifically, the Fe 3 O 4 in AF acted as both ion precursor and protector to inhibit Ag aggregation to obtain uniform and dispersed core/shell AFM. By adjusting the MIL-100(Fe) thickness and the Ag proportion, the optimum AFM exhibits superior photo-Fenton activity to decompose 88.5% RhB within 30 min under visible-light irradiation and H 2 O 2 addition, which is much higher than that of AFM in the presence of either light (58.5%) or H 2 O 2 (46.6%) due to the synergistic effects of visible-light absorption by MIL-100(Fe) and ·OH generation from H 2 O 2 . Moreover, the catalyst can be collected conveniently for its strong magnetic responsibility. This work may be beneficial to the development of effective photo-Fenton catalysts. Graphical abstract A novel magnetically recyclable Ag/Fe 3 O 4 @MIL-100(Fe) with special core/shell structure was facilely synthesized by hydrothermal method with superior photo-Fenton activity for dye degradation.
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Journal of the American Chemical Society
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2022
·
IF 16.383
Xiao Liu,Zhi Chen,Suxian Xu,Guoquan Liu,Yong Zhu,Xiaoqiang Yu,Licheng Sun,Fei Li
In a photoelectrochemical (PEC) cell, the production of solar fuels such as hydrogen is often accompanied either by the oxidation of water or by the oxidation of organic substrates. In this study, we report bromide-mediated PEC oxidation of alkenes at a mesoporous BiVO4 photoanode and simultaneous hydrogen evolution at the cathode using water as an oxygen source. NaBr as a redox mediator was demonstrated to play a dual role in the PEC organic synthesis, which facilitates the selective oxidation of alkenes into epoxides and suppresses the photocorrosion of BiVO4 in water. This method enables a near-quantitative yield and 100% selectivity for the conversion of water-soluble alkenes into their epoxides in H2O/CH3CN solution (v/v, 4/1) under simulated sunlight without the use of noble metal-containing catalysts or toxic oxidants. The maximum solar-to-electricity efficiency of 0.58% was obtained at 0.39 V vs Ag/AgCl. The obtained epoxide products such as glycidol are important building blocks of the chemical industry. Our results provide an energy-saving and environment-benign approach for producing value-added chemicals coupled with solar fuel generation.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
·
IF 7.926
Hussein Abdelraouf,Jing Ding,Jiayi Ren,Guanshu Zhao,Fanyang Zhou,Shuyan Guan,Xuedong Zhai,Qingliang Zhao
A novel and short-term preparation method was conducted to fabricate pristine BiVO 4, and Gadolinium (Gd) doped BiVO 4 photocatalysts at sub-100 °C. The optical, structural, morphology, microstructure, and compositional characteristics of the fabricated photocatalysts were examined, which illustrated that the doping of Gd stabilized the existence of the tetragonal phase structure and enlarged the specific surface area of the pristine BiVO 4 . The comparison of the photocatalytic performance, preparation power consumption , and preparation cost showed the superiority of Gd doped BiVO 4 photocatalyst fabricated by the Short-Term Synthesis Method at sub-100 °C. The ofloxacin (OFL) removal rate with 5%, 7%, and 10% Gd-BiVO 4 photocatalysts was 1.53, 1.61, and 1.83 times that with pristine BiVO 4 under sunlight, respectively. The degradation performance of target contaminants, including diclofenac, tetracycline HCl , ofloxacin, rhodamine B, and sulfadiazine, was demonstrated after one hour of sunlight irradiation with 5% Gd-BiVO 4 , achieving the removal efficiencies of 98.63%, 98.07%, 97.98%, 92.09%, and 78.56%, respectively. The effect of various factors on the removal performance was revealed, indicating that SO 4 2− and H 2 PO 4 − had a remarkable inhibitory effect on the degradation. The 5% Gd-BiVO 4 also showed excellent reusability and stability after five-cycle runs. The photogenerated holes (h + ) and the superoxide radicals ( • O 2 − ) were the predominant generated active species , and the possible photocatalytic mechanism for the degradation of organic contaminants was proposed. Simple prepared Gd-BiVO 4 photocatalysts were revealed to be a practical and potential choice for efficiently degrading contaminants with sunlight as green energy.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Lianyang Zhang,Yue Meng,Hui Shen,Jinhua Li,Chunfang Yang,Bo Xie,Shengjie Xia
In this work, the advantages of in situ loading, heterojunction construction, and facet regulation were integrated based on the poly-facet-exposed BiOCl single crystal, and a facet-oriented supported heterojunction of Cu2O and BiOCl was fabricated (Cu2O@BiOCl[100]). The photocatalytic nitrogen reduction reaction (pNRR) activity of Cu2O@BiOCl[100] was as high as 181.9 μmol·g–1·h–1, which is 4.09, 7.13, and 1.83 times that of Cu2O, BiOCl, and Cu2O@BiOCl-ran (Cu2O randomly supported on BiOCl). Combined with the results of the photodeposition experiment, X-ray photoelectron spectroscopy characterization, and DFT calculation, the mechanism of Cu2O@BiOCl[100] for pNRR was discussed. When Cu2O directionally loaded on the [100] facet of BiOCl, electrons generated by Cu2O will be transmitted to the [100] facet of BiOCl through Z-scheme electron transmission. Due to the directional separation characteristics of charge in BiOCl, the electrons transmitted from Cu2O are enriched on the [001] facet of BiOCl, which will together with the original electrons generated by pristine BiOCl act on pNRR, thus greatly improving the activity of photocatalytic ammonia synthesis. Thus, a new construction scheme of biphasic semiconductor heterojunction was proposed, which provides a reference research idea for designing and synthesizing high-performance photocatalysts for nitrogen reduction.
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Microorganisms
·
2022
·Vol. 10
·期 1
·124
·
IF 4.926
Xinling He,Siqi Jin,Wei Fan,Bing Fan
The prevention and treatment of oral diseases is more difficult in diabetic patients with poorly controlled blood glucose levels. This study aims to explore an effective, low-cytotoxicity medication for root canal treatment in diabetic patients. The antibacterial effect of the combination of Triton X-100 (TX-100) and metformin (Met) onEnterococcus faecalis(E. faecalis) was evaluated by determining the minimum inhibitory concentration (MIC), minimum bactericidal concentration required to kill 99% bacteria (MBC99) and by conducting dynamic time-killing assays. While the antibiofilm activity was measured by crystal violet (CV) assay, field emission scanning electron microscope (FE-SEM), confocal laser scanning microscope (CLSM) and colony-forming unit (CFU) counting assays. The expression of relative genes was evaluated by real-time quantitative polymerase chain reaction (RT-qPCR), and the cytotoxicity of the new combination on MC3T3-E1 cell was also tested. Results showed that the antibacterial and antibiofilm activities of Met could be significantly enhanced by very low concentrations of TX-100 in both normal and high-glucose conditions, with a much lower cytotoxicity than 2% chlorhexidine (CHX). Thus, the TX-100 + Met combination may be developed as a promising and effective root canal disinfectant for patients with diabetes.Keywords:antimicrobial activity;dentinal tubules;Enterococcus faecalis;high-glucose condition;metformin;Triton X-100
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Xinpeng Chen,Aijing Li,Jiabao Wu,Jin Cheng,Desheng Sha,Yurong Sun,Yifeng Wang,Tieling Xing,Guoqiang Chen
The majority of efficient photocatalysts are powder-like, making recycling difficult. In this work, carbon cloth (CC) was used as the substrate, two MOF cloth composites MIL-88@CC and MIL-100@CC were prepared at room temperature , and the morphology and structure of MOF cloth composites were examined using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared-attenuated total reflectance (FTIR), X-ray photoelectron spectroscopy (XPS). The results of photocatalytic degradation tests show that the two heat-treated MOF cloth composites have excellent degradation effects on MB . The two MOF cloth composites can degrade above 97 % of MB (20 mg/L) within 30 min under the irradiation of 250 W high-pressure mercury lamp and stirring, far exceeding the raw MOF cloth. The presence of oxygen vacancy defects is thought to have improved the heat-treated MOF cloth's photocatalytic efficiency by upsetting the symmetry of the material and facilitating electron and hole separation.·OH and·O 2 - were found to be the main reactive oxygen species (ROS) involved in the degradation process, according to quenching studies and electron spin resonance (ESR) research. In addition, the macroscale MIL-88@CC and MIL-100@CC have considerable potential for degrading dyes, which presents a practical solution to sustainable development concerns.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 6
·1523-1532
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IF 3.174
Shiting Xu,Xixi Chen,Shujuan Zhan,Shuanghong Tian,Ya Xiong
BACKGROUND To strengthen the treatment efficiency of photocatalytic ozonation, it is necessary to develop a stable bifunctional catalyst active in both processes of photocatalysis and catalytic ozonation. RESULTS A series of Fe doped CeO 2 nanocubes with the main exposure of active (100) crystal facets were simply synthesized by a one-pot hydrothermal method and applied in photocatalytic ozonation for the first time. It was found that doping did not change the morphology of nanocubes but it decreased the crystal size, induced abundant defects of oxygen vacancies and Ce 3+ , and shifted the optical absorption edge to the visible region. Due to these structure modifications, Fe doped CeO 2 nanocubes enhanced the mineralization rate of 4-chlorophenol by 55.4–74.7% and reduced the formation of carcinogenic bromate by 60.2–85.4%, depending on the doping content. Due to the simultaneous occurrence of photocatalysis, catalytic ozonation, and their synergy in 5%Fe-CeO 2 mediated photocatalytic ozonation under solar irradiation, 4-chlorophenol almost completely degraded within 9 min, 74.7% of mineralization rate was achieved within 45 min, and the first order kinetics reaction constant reached 2.97 × 10 −2 ·min −1 , about 4.1 times that of photo ozonation without any catalysts. Moreover, the introduction of 5%Fe-CeO 2 to the ozonation, photolysis, and photo ozonation decreased the corresponding energy consumption by 60.2%, 84.2%, and 62.5%, respectively. CONCLUSION In this study, an efficient and economical Fe doped CeO 2 nanocubes-mediated photocatalytic ozonation process was successfully developed for the refractory organics-containing wastewater treatment under solar light irradiation. © 2021 Society of Chemical Industry
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Chaofeng Zhang,Yaozong Yang,Linfeng Li,Jiandong Zhang,Shuangping Huang,Ruifeng Li
Polyoxymethylene dimethyl ether (PODEn) is a promising ether fuel. Especially PODE3–5 can be directly mixed into diesel without modification of the diesel engine’s infrastructure for improving thermal efficiency, and significant reduction in particulate matter (PM) and nitrogen oxides (NOx) emissions. In this paper, a series of heterogeneous catalysts, the imidazole sulfonate ionic liquids (ILs) encapsulated in the cages of metal–organic frameworks (MOFs) MIL-100(Fe), were used successfully and efficiently in the synthesis of polyoxymethylene dimethyl ethers (PODEn) from methanol and trioxane (TOX). These catalysts have exhibited excellent catalytic properties because of strong Brønsted acid sites. MIL-100(Fe)@[BSO3HIm][CF3SO3] shows the best catalytic activity with 96.98% conversation of TOX and 47.49% selectivity of the desired product PODE3–5 under a mild reaction condition. Of importance is that the catalyst is recovered easily and reused.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Sijia Li,Jianan Cui,Xia Wu,Xuan Zhang,Qi Hu,Xiaohong Hou
Metal-Organic Frameworks (MOFs) are efficient adsorbent and catalyst, however, the prepare of MOFs can be extremely time consuming. The rapid in situ microwave synthesis process offers the possibility of MOFs to a large-scale application. In this study, Fe 3 O 4 @MIL-100(Fe) was rapidly prepared via microwave in 30 min using Fe 3 O 4 as metal precursor and applied as the adsorbent and photocatalyst to remove diclofenac sodium (DCF) from water. Fe 3 O 4 @MIL-100(Fe) exhibited an excellent adsorption effect to DCF with the maximum adsorption capacities of 400 mg/L. The presence of H 2 O 2 could promote the removal of DCF during photocatalytic process. Approximately 99.4% of the DCF was removed in Fe 3 O 4 @MIL-100(Fe)/vis/H 2 O 2 system via adsorption removal and consequent photocatalytic degradation . The high efficiency was attributed to the large BET surface area (1244.62 m 2 /g) and abundant iron metal sites (Fe(III) and Fe(II)) of Fe 3 O 4 @MIL-100(Fe). The adsorptive, photocatalytic property of Fe 3 O 4 @MIL-100(Fe) and the Fenton-like reaction were the main mechanisms for DCF removal. TOC analyzer was served to assess the mineralization of solutions treated by Fe 3 O 4 @MIL-100(Fe)/vis/H 2 O 2 in 12 h. High elimination of TOC (87.8%) was observed during the DCF mineralization process. In addition, the major products were illuminated using HPLC-Q-TOF-MS and DCF degradation pathways were also proposed.
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CATALYSIS LETTERS
·
2019
·Vol. 149
·期 9
·2586-2596
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IF 2.372
Shen Xiaohua,Wang Jingjing,Liu Miaoqing,Li Mengzhe,Lu Jianjun
Abstract A new route to synthesis hierarchical Ti-rich TS-1 with uniform intracrystalline mesopores, uniform crystal size and the higher Ti content has been developed by using the environmental-friendly and cheap surfactant Triton X-100 as the assisted template agent and (NH 4 ) 2 CO 3 as crystallization-mediating agent. In this way, the surface area and pore volume of the resulting materials can be adjusted by the Triton X-100 content. The catalytic properties of the Nano-size hierarchical Ti-rich TS-1 were investigated by hydroxylation of benzene to phenol with H 2 O 2 as oxidizing agent and deionized water as solvent. Due to the combination of hierarchical pores and high titanium content, the hierarchical Ti-rich TS-1 shows improved catalytic activity in the oxidation of benzene. Graphical Abstract
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Nanomaterials
·
2018
·Vol. 8
·期 6
·446
·
IF 3.504
Yuge Feng,Chengliang Wang,Fei Ke,Jianye Zang,Junfa Zhu
Slow and controlled release systems for drugs have attracted increasing interest recently. A highly efficient metal-organic gel (MOGs) drug delivery carrier, i.e., MIL-100(Al) gel, has been fabricated by a facile, low cost, and environmentally friendly one-pot process. The unique structure of MIL-100(Al) gels has led to a high loading efficiency (620 mg/g) towards doxorubicin hydrochloride (DOX) as a kind of anticancer drug. DOX-loaded MOGs exhibited high stability under physiological conditions and sustained release capacity of DOX for up to three days (under acidic environments). They further showed sustained drug release behavior and excellent antitumor effects in in vitro experiments on HeLa cells, in contrast with the extremely low biotoxicity of MOGs. Our work provides a promising way for anticancer therapy by utilizing this MOGs-based drug delivery system as an efficient and safe vehicle.Keywords:metal-organic gels;doxorubicin loading and release;pH-responsiveness;anticancer effect
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Analytical Methods
·
2014
·Vol. 7
·期 4
·1463-1470
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IF 1.938
Yaoyao Jia,Qing Jin,Yan Li,Yuxiu Sun,Jianzhong Huo,Xiaojun Zhao
Metal–organic framework MIL-100(Fe) has high surface area, mesoporous cages, metal active sites and excellent water stability. These fascinating properties endow MIL-100(Fe) with the potential to extract organic dyes from environmental water samples. In the present work, MIL-100(Fe) is synthesized and applied as an adsorbent to remove three different types of dyes from aqueous solution in view of assessing the adsorption isotherms, kinetics and thermodynamics, desorption, and adsorbent regeneration. The adsorption for methylene blue and methyl blue follows a pseudo-second-order kinetics and fits the Freundlich model. The adsorption is a spontaneous process, but is controlled by different thermodynamic parameter changes. Moreover, MIL-100(Fe) could hardly adsorb isatin. Variables influencing the adsorption efficiency, such as adsorption time, temperature, solution pH, adsorbent dosage and salt concentration, are investigated. No remarkable effects of pH and ionic strength are observed for the adsorption of methylene blue and methyl blue on MIL-100(Fe). The used MIL-100(Fe) could be regenerated effectively and recycled without a significant loss of adsorption ability. The adsorption efficiency is about 100% for methylene blue and 52.1% for methyl blue, and the developed method is applied to remove two types of dyes in local water samples.
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