ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Chengzhuo Yu,Jin Xu,Li Xiong,Yarui Wang,Silong Wang,Fanglan Geng,Zesen Shang,Huasheng Wu,Lixia Zhao,Yawei Wang
Luminol-based chemiluminescence (CL) systems, as a powerful tool for bioanalysis, are limited owing to their weak CL intensity and self-decomposition of the classic oxidant H2O2. Herein, we introduced a new luminol CL enhancer, the natural light-driven photocatalyst MIL-100(Fe)/TiO2, for the selective determination of dopamine (DA). By employing MIL-100(Fe)/TiO2 for the first time as an efficient enhancer, the MIL-100(Fe)/TiO2-luminol CL intensity was 100 times higher than that of the classical H2O2-luminol system. The CL spectrum, UV–vis absorption spectroscopy, radical scavenger experiments, and electron spin resonance spectroscopy were utilized to investigate the possible CL mechanism of the MIL-100(Fe)/TiO2-luminol system. All of the results indicated that MIL-100(Fe)/TiO2 can generate reactive oxygen species under mild natural light, which could react rapidly with the luminol anion radical and result in direct CL emission. The sensitive plate for DA was developed based on its inhibiting effect on CL intensity, and the linear range between CL intensity and DA concentration was 100 nM–1000 μM with a detection limit of 16.7 μM (S/N = 3). This study successfully achieved a stable reactant that can directly trigger the CL of luminol without the need for additional oxidizing agents under mild natural light and offers new possibilities for photoinduced amplification technology.
研究领域:
分析化学
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生物医学工程
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DOI
PubMed
高影响因子
CHEMPHYSCHEM
·
2022
·Vol. 24
·期 7
·e202200505
·
IF 3.52
Xujun Ma,Donghui Wang,Jianan Wu,Bin Zhao,Feng Chen
Graphical Fe 3+ doping was utilized to promote the formation of oxygen vacancies and improve the interaction between TiO 2 and atomic Pt. Single Pt atoms anchored on the oxygen vacancy sites of Fe−TiO 2 effectively modify the local energy band structure of TiO 2 , and thus significantly boost the catalytic performance of either the intrinsic or the sensitized photocatalytic process for Pt/Fe−TiO 2 . Single atomic site catalysts display the maximal atom-utilization efficiency, unique structural properties, and remarkable enhancements on catalytic activity. Herein, single Pt atoms loaded Fe−TiO 2 catalysts were prepared. Fe 3+ doping leads to the formation of oxygen vacancies and improve the interaction between TiO 2 and Pt. Single Pt atoms are thus anchored and effectively modify the local energy band structure of TiO 2 . The optimized local band structures improve the intrinsic photoexcitation of Pt/Fe−TiO 2 , promote the separation of photogenerated carriers, and extend the lifetime of photogenerated carriers. Meanwhile, the electrons transfer from the excited dyes to the conduction band edge of Pt/Fe−TiO 2 is also facilitated due to the shift-down of the conduction band edge. Therefore, with the increase of the Pt content (till up to 0.6 wt%), the photocatalytic performance of Pt/ Fe−TiO 2 with the confined single Pt atoms is significantly boosted in either the intrinsic or the sensitized photocatalytic process.
研究领域:
材料科学
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催化化学
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DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 26
·期 6
·1839-1850
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IF 1.947
He Lei,Zhang Yaqin,Zheng Yane,Jia Qingming,Shan Shaoyun,Dong Yanan
An effective catalyst of MIL-101(Fe)/TiO 2 composite was synthesized by solvothermal method. The resultant MIL-101(Fe)/TiO 2 was used for advanced oxidation degradation of tetracycline (TC) for the first time. The results indicated that the MIL-101(Fe)/TiO 2 showed higher TC degradation efficiency than pure MIL-101(Fe) or TiO 2 with the persulfate. Using 1 g L −1 MIL-101(Fe)/TiO 2 and persulfate at pH 7, 90.15% degradation rate was achieved under xenon lamp irradiation in 5 min for 20 mg L −1 TC. TiO 2 introduced in the composite played an important role in the degradation process, in which TiO 2 had a synergetic effect with Fe 3+ to generate Fe 2+ , Ti 3+ and radicals. Fe 2+ reacted with persulfate to produce Fe 3+ and a number of · OH to degrade TC. This reaction process was so fast that MIL-101(Fe)/TiO 2 with persulfate could degrade TC fairly rapidly. A novel TiO 2 -based metal–organic frameworks (MOFs) composite was more efficient for degrading pharmaceutical wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 22
·14835
·
IF 4.614
Jinkai Shu,Bozhi Ren,Wei Zhang,An Wang,Sen Lu,Shuyu Liu
Modified Shell Powder/La-Fe-TiO2(La-Fe-TiO2@MSP) composites were fabricated using the sol-gel method and characterized by SEM, XRD, UV-vis DRS and photocurrent techniques, and their physicochemical and optical properties were analyzed. The effects of various factors on the photocatalytic degradation of pyridine and its reaction kinetics were investigated by batch experiments using pyridine, a typical nitrogen-containing heterocyclic compound in coal chemical wastewater, as the target removal species. The pyridine degradation rate of 80.23% was obtained for 800 mg/L composite solution by photocatalytic oxidation of 50 mg/L pyridine wastewater for 180 min at 35 °C, pH = 8 and light intensity of 560 W. The photocatalytic degradation performance was optimal. The quenching experiments determined that the active species of photodegradation were mainly hole and hydroxyl radicals, and the photocatalytic degradation mechanism was analyzed in this way.Keywords:La-Fe-TiO2@MSP;photocatalysis;pyridine;reaction kinetics
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Hanmin Zhong,Xiaoying Ye,Xueting Xie,Xianliang Song,Shucan Luo,Wenbei Situ
With the large surface area and excellent adsorption properties of MIL-101(Fe), MIL-101(Fe)/TiO 2 photocatalysts were prepared by chemical method and physical method in this research, respectively. The photocatalysts' performance on ethylene degradation was evaluated, and the photocatalyst prepared using the chemical method (CH-MT) performed better than that by physical method (PHY-MT) under the same conditions. Moreover, the photocatalysts' molecular structure was characterized by XRD, FTIR, UV–Vis DRS, BET, and XPS. The redox process of Ti 4+ /Ti 3+ of TiO 2 and Fe 3+ /Fe 2+ effectively prevents the complexation of e − -h + pairs. In this cycle, the oxidatively active substance (∙O 2 - ) is provided, which plays a key role in the ethylene degradation of MIL-101(Fe)/TiO 2 photocatalysts. Furthermore, in the BET analysis, CH-MT's specific surface area and pore volume were smaller than PHY-MT's, which improved ethylene absorption, enhanced the transfer of photogenerated carriers, and raised the photocatalytic reaction efficiency of CH-MT. The differences between MIL-101(Fe)/TiO 2 photocatalysts prepared by various methods were investigated and discussed, providing a new approach for MOF materials' application in agricultural areas.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ChemCatChem
·
2024
·
IF 3.8
Chengzhuo Yu,Jin Xu,Yarui Wang,Silong Wang,Li Xiong,Fanglan Geng,Zesen Shang,Huasheng Wu,Jitao Lv,Lixia Zhao,Yawei Wang
Graphical Untill now, reactive oxygen species (ROS) are difficult to generate in the natural light conditions, since most photocatalysts require external strong stimuli. We surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. The ROS generation patterns and mechanism of MIL-100(Fe)/TiO 2 was revealed by chemiluminescence (CL) and density functional theory (DFT). Reactive oxygen species (ROS), as one kind of the most highly oxidizing oxidants, are difficult to generate and utilize in the natural light conditions, since many materials require external strong stimuli for ROS release to be effective as pollutant degradation or biocide. In this work, we surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. Then ROS generation patterns and mechanism was revealed by chemiluminescence (CL) and density functional theory (DFT). Meanwhile, rhodamine B (RhB) can also be removed by MIL-100(Fe)/TiO 2 under natural light, which further evidence the ROS generation under the natural light. This work provides a new direction for spontaneously generating ROS releasing without external strong stimuli and has the broad potential applications in the field of pollutant degradation or antimicrobials under natural conditions.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Nano-Micro Letters
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2020
·Vol. 12
·期 1
·1-16
·
IF 12.264
Deng Baiwen,Xiang Zhen,Xiong Juan,Liu Zhicheng,Yu Lunzhou,Lu Wei
Sandwich-like laminated Fe&TiO 2 @C nanocomposites were successfully prepared from the MXene–MOFs hybrids.
A broad effective bandwidth of 6.5 GHz at a thickness of only 1.6 mm was achieved.
研究领域:
材料科学
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电磁学
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DOI
PubMed
高影响因子
CHEMOSPHERE
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2020
·
IF 5.778
Nan Yang,Yanping Liu,Jia Zhu,Zhongqiang Wang,Jinwei Li
In order to improve the catalytic activity and recycling performance of heterogeneous Fenton catalyst, a heterogeneous Fenton catalyst Fe/TiO 2 based on TiO 2 supported visible light response was prepared by a simple method using TiO 2 synthesized by sol-gel method as carrier and ferric nitrate as Fe source. It was characterized by SEM , EDX , XRD, UV–vis instruments. The influencing factors of catalytic degradation of atrazine by visible light heterogeneous Fenton of Fe/TiO 2 were studied and the reaction kinetics were fitted. The mineralization degree of atrazine was reflected by the removal rate of TOC. The intermediate products by the degradation of the catalytic system was analyzed and the reaction mechanism of Fe/TiO 2 –H 2 O 2 visible light system was discussed. The XRD results showed that Fe was highly dispersed on the surface of TiO 2 in the form of α-Fe 2 O 3 . The Fe/TiO 2 catalyst with heterogeneous Fenton and visible light photocatalytic activity was successfully optimized, forbidden bandwidth of Fe/TiO 2 after Fe supported was narrower, the scope of light absorption red-shifted, the electron-hole pairs were more generated, and there was a significant synergistic effect between the carrier TiO 2 and the supported Fe, which exhibited good oxidation capacity for degradation of 10 mg L −1 atrazine in pH of 3, the concentration of H 2 O 2 was 1.6 mM, and the catalyst was added at 1 g L −1 , achieving over 95% removal efficiency within 30 min, and, in the range of pH 3–7, the degradation rate of the reaction for 30 min can be maintained above 75%, which greatly broadened the range of pH application and had good recycling performance. The degradation process conformed to the quasi-first-order kinetic model . Through LC-MS analyzed, 12 intermediate products were formed during the degradation of atrazine, the final products were all cyanuric acid, and then the triazine ring was mineralized into inorganic substances such as CO 2 , H 2 O and NO 3 − by oxidation of ·OH, and the possible degradation pathways were inferred.
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lizhu Chen,Xueting Xie,Xianliang Song,Shucan Luo,Shengying Ye,Wenbei Situ
To maintain the quality of harvested fruits and vegetables in a closed refrigerated environment, a novel nanocomposite photocatalyst MIL101(Fe)-TiO 2 -rGO (MTR) for ethylene degradation was synthesized. The characterization of MTR was analyzed by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and High-resolution transmission electron microscope (HRTEM). Moreover, with the good conductivity of rGO, MTR had the smallest band gaps according to ultraviolet–visible solid diffuse reflection (UV–Vis DRS) analysis; this small band gap size improved the utilization of light. According to the results of the photoluminescence spectra and electrochemical impedance spectra, the charge transfer resistance and transient photocurrent of MTR were improved. The redox process of Ti 4+ /Ti 3+ from TiO 2 and Fe 3+ /Fe 2+ from MIL101(Fe) efficiently prevented the recombination of e - -h + pairs. In this cycle, oxidative active substances ( • O 2 − ) were provided, which played a key role in the ethylene degradation of MTR. Additionally, MTR has excellent gas adsorption capacity, and the photocatalytic degradation rate of C 2 H 4 by MTR was 2.07 × 10 -4 min −1 , which is better than that of other photocatalysts. Furthermore, the photocatalytic activity of MTR was still stable after 4 times of recycling, indicating the potential to maintain the quality of horticultural products after harvesting.
研究领域:
食品科学
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材料科学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Guoqiang Shen,Lun Pan,Zhe Lü,Chongqing Wang,Fazal-e- Aleem,Xiangwen Zhang,Ji-Jun Zou
Adsorption and photodegradation are promising approaches for removing organic pollutions. In this study, we combined these two processes by co-loading Fe-TiO 2 and Fe 2 O 3 quantum dots (QDs) on porous MCM-41, using a simple hydrolysis method. X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy results indicated that Fe-TiO 2 QDs are formed at low Fe precursor concentrations, while additional Fe 2 O 3 QDs are formed at higher Fe precursor concentrations. The Fe 2 O 3 and Fe-TiO 2 QDs impart high adsorption capacity and high photoactivity to the porous MCM-41, respectively. Thus, their combination results in a synergic effect of the adsorption and photodegradation. The highest-performing sample exhibits excellent performance in removing rose bengal from aqueous solution.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xueying Cheng,Renquan Guan,Yunning Chen,Yudan Qian,Qingkun Shang,Yingnan Sun
In this study, the adsorption and photocatalytic degradation of oxytetracycline (OTC) were systematically investigated using different metal-doped anatase-phase mesoporous TiO 2 nanocatalysts (M−TiO 2 , M = Fe, Co, Ni, Cr). The results showed that doping with different metals had a significant effect on the ability of TiO 2 to adsorb and degrade OTC . Comparing the photoelectric properties of four photocatalysts (Fe-TiO 2 , Co-TiO 2 , Ni-TiO 2 and Cr-TiO 2 ), it was observed that the mutual synergy between the separation ability of the photogenerated carriers and the adsorption ability of pollutants was the fundamental reason for the excellent photocatalytic performance of Fe-TiO 2 . The relative intensities of the high-resolution mass spectrometry (HRMS) peaks were used to track and analyse the degradation products of pollutants at different adsorption or light-irradiation times during the photocatalytic process. The ability of the pollutants to undergo dark-state adsorption significantly influenced their degradation paths and products. The possible mechanism of the photocatalytic decomposition of pollutants using Fe-TiO 2 along different paths was proposed according to the Fukui function calculation and MS results. To the best of our knowledge, this is the first time that quantitative HRMS results have been used to assess the degradation pathways of pollutants.
研究领域:
环境科学
·
分析化学
·
材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ya-Nan Jing,Xing-Liang Yin,Lei-Lei Li,Yan-Lan Wang,Jia Xue,Ze-Feng Xu,Da-Qiang Liu,Chuan-Wu Chen,Xiao-Jie Liu,Er-Kang Liu
CO 2 -to-high value-added chemicals via a photocatalytic route is of interest but strangled by the low efficiency. Herein, a novel Fe-TiO 2-x /TiO 2 S-scheme homojunction was designed and constructed by using a facile surface modification approach whereby oxygen vacancy (OV) and Fe introducing on the TiO 2 nanorod surface. The as-synthesized Fe-TiO 2-x /TiO 2 S-scheme homojunction exhibits positive properties on promoting photocatalytic CO 2 reduction: i) the nanorod structure provides numerous active sites and a radical charge transfer path; ii) the doped Fe and OV not only synergistically enhance light utilization but also promote CO 2 adsorption; iii) the Fe-TiO 2-x /TiO 2 S-scheme homojunction benefits photoexcited charge separation and retains stronger redox capacity. Thanks to those good characters, the Fe-TiO 2-x /TiO 2 homojunction exhibits superior CO 2 reduction performances with optimized CO/CH 4 generation rates of 122/22 μmol g -1 h −1 which exceed those of pure TiO 2 by more than 9.4/7.3 folds and most currently reported catalytic systems. This manuscript develops a facile and universal approach to synthesize well-defined homojunction and may inspire the construction of other more high-efficiency photocatalysts toward CO 2 reduction and beyond.
研究领域:
材料科学
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环境科学
·
化学工程
·
催化
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DOI
PubMed
高影响因子
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