ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Yuhua Dong,Xueyan Du,Yutong Xie,Kexin Wu,Qiong Zhou
A quaternary composite of Ti 3 C 2 /TiO 2 /TiN/polyaniline was synthesized by doping TiN nanoparticles on the calcined Ti 3 C 2 MXene nanosheets , and then polyaniline was deposited through chemical oxidation . The bandgap and flat band potential of composite were determined by X-ray diffraction and ultraviolet–visible spectroscopy. In order to prepare photoanode and photocathodic protective coating, the quaternary composite was added to the polyvinyl alcohol solution and epoxy resin to. Photoelectrochemical results indicated that photoanode and relevant photocathodic protective coating had similar photocurrent with about 5 μA cm −2 , but open circuit potential of the photocathodic protective coating was more negative than that of photoanode. The R ct of photoanode with illumination was 5.5 kΩ, while that of photocathodic coating was 136 kΩ. The 304 stainless steel could be well protected by the photoanode and photocathodic protective coating whether illumination or not, due to synergistic effect of local surface plasmonic resonance of TiN, “electron pool” of polyaniline and non-interfacial contact of TiO 2 and MXene. Moreover, the epoxy resin in the photocathodic coating could act as a kind of physical barrier in the dark environment. Additionally, results of long-term protection test indicated that the photocathodic protective coating under intermittent illumination had better protection property than that of the coating without illumination.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 7
·1-10
·
IF 5.7
Zhang Yujie,Yu Jiarui,Huang Wanjin,Jin Zhenhuan,Li Jianping
A novel extended-gate field-effect transistor (FET) photoelectrochemical (EGFET PEC) sensor was designed for highly sensitive detection of L-cysteine (L-Cys). TiO 2 was initially modified on the ITO electrode by the sol–gel dip-coating method and calcined to produce TiO 2 /ITO. Then, CdS was synthesized on the TiO 2 surface by hydrothermal method to obtain the CdS–TiO 2 heterojunction material. CdS/TiO 2 /ITO was connected to the gate of the FET to obtain an EGFET PEC sensor. Under the irradiation of a xenon lamp simulating visible light, the CdS/TiO 2 heterojunction composite absorbs light energy to produce photogenerated electron–hole pairs, which have strong photocatalytic oxidation activity and oxidize L-Cys covalently identified by Cd(II) through CdS covalent. These pairs generate a photovoltage that controls the current between the source and the drain to detect L-Cys. Under the optimized experimental conditions, the optical drain current ( I D ) of the sensor exhibited a good linear relationship with the logarithm of L-Cys in the range of 5.0 × 10 −9 –1.0 × 10 −6 mol/L, and the detection limit was 1.3 × 10 −9 mol/L (S/N = 3), which is lower than the values reported by other detection methods. Results showed that the CdS/TiO 2 /ITO EGFET PEC sensor revealed high sensitivity and good selectivity. The sensor has been used to determine L-Cys in urine samples. Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Juntao Tang,Mengying Fu,Yidan Mao,Shuyi Yang,Wei Lin,Yan Yu,Shuang Song
Photocatalysis is regarded as a promising in situ air purification technology for the removal of volatile organic compounds. However, the deactivation of photocatalysts remains a serious issue that needs to be addressed. Herein, we report a novel dual-functional photocatalyst (TiO 2 @HYZ) with spatially separated catalytic sites and adsorption sites, which has been obtained by combining hydrophilic {0 0 1} TiO 2 nanosheets with hydrophobic NaY zeolite. TiO 2 @HYZ showed excellent photocatalytic activity for the degradation of gaseous toluene under UV irradiation in humid air. The optimized TiO 2 @HYZ-2 (containing 45.7 wt% TiO 2 ) achieved 96.6% toluene removal and 87.4% mineralization within 120 min. The specific reaction rate constant of TiO 2 @HYZ-2, pristine TiO 2 and P25 normalized by the unit amount of TiO 2 during the photocatalytic degradation process were calculated to be 0.481, 0.230 and 0.250 min −1 g −1 , respectively. Moreover, TiO 2 @HYZ-2 showed superior durability, maintaining stable performance over repeated toluene degradation processes, even at high toluene concentration, whereas pristine TiO 2 incurred severe deactivation with increasing number of photocatalysis cycles. The significantly enhanced activity and anti-deactivation property was attributed to a synergistic effect between HYZ and TiO 2 in the catalyst structure, which strengthened the adsorption of toluene on HYZ and facilitated effective separation of photoexcited charge carriers on TiO 2 , thus avoiding the deposition of degradation intermediates on the active sites and simultaneously improving mineralization. This work provided a new perspective for the design of efficient and deactivation-resistant photocatalysts for air pollution remediation.
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Nanomaterials
·
2022
·Vol. 12
·期 19
·3444
·
IF 5.719
Fei Han,Sai Ma,Dong Li,Md Mofasserul Alam,Zeheng Yang
An Sb2S3-sensitized TiO2(Sb2S3/TiO2) photo-anode (PA) exhibiting a high photo-electrochemical (PEC) performance in water oxidation has been successfully prepared by a simple chemical bath deposition (CBD) technique. Herein, the Raman spectra and XPS spectrum of Sb2S3/TiO2confirmed the formation of Sb2S3on the TiO2coatings. The Sb2S3/TiO2photo-anode significantly shifted the absorption edge from 395 nm (3.10 eV) to 650 nm (1.90 eV). Furthermore, the Sb2S3/TiO2photo-anode generated a photo-anodic current under visible light irradiation below 650 nm due to the photo-electrochemical action compared with the TiO2photo-anode at 390 nm. The incident photon-to-current conversion efficiency (IPCE = 7.7%) at 400 nm and −0.3 V vs. Ag/AgCl was 37 times higher than that (0.21%) of the TiO2photo-anodes due to the low recombination rate and acceleration of the carriers of Sb2S3/TiO2. Moreover, the photo-anodic current and photostability of the Sb2S3/TiO2photo-anodes improved via adding the Co2+ions to the electrolyte solution during photo-electrocatalysis.Keywords:Sb2S3/TiO2;photo-anode;long wavelength;photo-electrochemical;water oxidation
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Electronic Materials Letters
·
2022
·Vol. 19
·期 1
·84-93
·
IF 3.151
He Jieying,Chen Tongsheng
Synthesis of anatase titanium dioxide (TiO 2 ) catalysts with excellent photocatalytic activity is of great importance in photocatalytic application. In this work, a cross-like anatase TiO 2 structure is obtained by thermal treatment of precursors synthesized in an electrochemical cell with mixed phases of (NH 4 ) 2 TiOF 4 and NH 4 TiOF 3 . When calcined at various temperatures, these obtained anatase TiO 2 products could preserve their original morphologies and structures until 750 °C and kept anatase phase from rutile till 900 °C showing better thermal and structural stability, which was probably associated with fluoride contents on the surface of anatase TiO 2 products after conversion from (NH 4 ) 2 TiOF 4 and NH 4 TiOF 3 precursors. The photocatalytic activity of prepared TiO 2 samples over methyl orange is investigated. The photocatalytic activity of mesocrystalline TiO 2 cross decreases with the increase of the calcination temperature of ammonium oxofluorotitanates except for a best performance at 600 °C. The calcination temperature-dependent catalytic performance of the products could be ascribed to the removal of fluorine, nitrogen, or hydroxyl radicals on the surface, and the change of crystallinity and crystallite size with varying heating temperatures. The results indicated that anatase TiO 2 mesocrystals calcined at 600 °C showed the highest photocatalytic performance more likely owing to well-defined morphology, good microstructure, and suitable crystallite size. Graphical Abstract
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 39
·18744-18750
·
IF 3.925
Dawang Chu,Hui Zhou,Zhicheng Luo
Selective conversion of glycerol to lactic acid requires the synergistic activation of C–H, C–O, and O–H. Herein, we report an inexpensive Fe–Cr/TiO2 catalyst that achieves lactic acid formation with a high selectivity of 60.5%. By changing the Fe/Cr ratios and reduction temperatures, the structures of Vő and Vő-OH were altered, which determined the overall oxidation–dehydration–isomerization process. The in situ ATR-IR experiments confirmed the activation of glycerol by adsorbing the primary −OH, and a series of control experiments verified that Fe was responsible for the cleavage of C–H and O–H, while CrOx catalyzed the activation of C–O and C–H. This work designs a hydrothermal catalyst with multifunctional ability, which may guide the rational catalyst design for the selective oxidation of glycerol to lactic acid.
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DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Xiaoyi Zhang,Guoliang Lin,Shenglan Ma,Mingyi Liu,Wanxi Jiang,Chen Wu
This article has been retracted: please see Elsevier Policy on Article Withdrawal ( http://www.elsevier.com/locate/withdrawalpolicy ). This article has been retracted at the request of the Corresponding Authors and Editor-in-Chief. One of the corresponding authors, Xiaoyi Zhang, notified the journal of several issues relating to the article and requested its retraction. These issues have been detailed below: - The experiments were not performed as reported in the article. Specifically, the coating was applied to a wood surface, rather than the reported concrete surface. When subsequent experiments were conducted using concrete, the experimental data were not reproducible. - Some of the authors informed the journal that they were not aware of the content of the manuscript, nor of their authorship. - In addition, according to Dr. Zhang: “…the pictures and data in the paper are used incorrectly, resulting in unreliable experimental results”. These issues represent a clear violation of our publishing policies, and publishing ethics standards. The Editor-in-Chief has assessed the case and decided to retract the article. The corresponding authors agreed to the retraction.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Pei Qiu,Mengjie Lu,Gang Cheng,Wei Li,Lijun Liu,Jinyan Xiong
Semiconductor photocatalysis serves a green technique to convert solar energy to sustainable hydrogen energy through water splitting. TiO 2 has attracting increasing interest and much effort has been paid on addressing the suffered drawbacks of solar energy utilization limitation and electron-hole recombination. In this work, simultaneously involving of oxygen vacancy and Cu into TiO 2 nanoparticles has been achieved through self-reduction of Cu 2 O and self-transformation of Ti-precursor from Cu 2 O@Ti-precursor in ethylene glycol-water medium. The Cu@TiO 2-x hybrids show improved photocatalytic H 2 production, and the Cu@TiO 2-x -1% sample has H 2 evolution rate of 7218.8 μmol g −1 h −1 , which is 2.1 times higher than that of TiO 2-x . It is proposed that the involving of metallic copper and oxygen vacancy by this solvothermal approach can enhance light absorption, promote electron-hole pairs separation and charge transfer, and increase active sites of TiO 2 nanoparticles, resulting in synergetic effect for hydrogen production improvement.
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Qiwen Jiang,Jialu Liu,Tiantian Qi,Yanhua Liu
The photocatalytic reduction of methylene blue was recognized as an economical and effective way for dye removal. To enhance photocatalytic activity under visible-light condition, fluorine and graphene synergistically modified TiO2 (F-TiO2/rGO) nanocomposites were successfully prepared by sol–gel method. Characterization results showed F ions played an essential role in the formation of TiO2 nanoparticles. Between the fluorine sources selected, NH4F was more optimal than NaF doping on the grounds that the existence of Na+ ion was an inevitable factor for the production of brookite. F-TiO2/rGO nanocomposite obtained by adding 5%at NH4F significantly narrowed the bandgap energy from approximately 3.17 to 2.41 eV. Box–Behnken design was adopted to optimize the MB photo-degradation process by F(5%NH4F)-TiO2/rGO nanocomposites under different reaction conditions. Moreover, the antibacterial behaviour of this novel material was also investigated by Escherichia coli (E. coli) bacteria under visible light. The morphology changes of E. coli cells were directly observed by field emission scanning electron microscope and further confirmed that the excellent sterilization of F-TiO2/rGO nanocomposites resulted from the active species. The outstanding photocatalytic performance and antibacterial behaviour of F-TiO2/rGO nanocomposite was attributed to the synergistic effect of photocatalytic redox reaction and adsorption. These results indicated F(5%NH4F)-TiO2/rGO nanocomposite was a promising antibacterial photo-adsorbent for wastewater treatment improvement.
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CHEMOSPHERE
·
2022
·
IF 8.943
Wanying Xie,Wei Song,Ji Li,Xiaolei Zhang,Wenyi Dong,Feiyun Sun
Modifying PVDF membrane by blending hydrophilic nano TiO 2 has been highly concerning, but its practical application is not well investigated. In this study, PVDF-TiO 2 membrane was employed in two modes to treat micro-polluted raw water for the first time, direct membrane filtration and pre-oxidation assists membrane filtration. At two filtration modes, the PVDF-TiO 2 membrane had comparable rejection capability to the unmodified PVDF membrane, as the removal of permanganate index (COD Mn ) was 0.26–0.72 mg/L, UV 254 was 0.0070–0.0618 cm −1 , turbidity was 1.60–4.49 NTU, and the total number of colonies was 360–23,780 CFU/mL. As for raw water treatment , using Fe 2+ /sodium dithionite (DTN)/O 2 system as the pre-oxidation process to assist the filtration of the PVDF-TiO 2 membrane was feasible. After optimization, the applicable conditions of the Fe 2+ /DTN/O 2 process were DTN dosage at 100 mg/L and a C Fe / C DTN of 1:4. As a result, the effluent qualities of the PVDF-TiO 2 membrane significantly improved. It was investigated that atrazine (ATZ), COD Mn , UV 254, and turbidity reduced, which was realized by the synergic effects of the pre-oxidation by free radicals and flocculation by iron. Pre-oxidation of the Fe 2+ /DTN/O 2 process could also enhance the permeability of the PVDF-TiO 2 membrane from 53.6 to 58.0 L/(m 2 ·h), nearly two times the PVDF membrane. Besides, the practical fouling of the PVDF-TiO 2 membrane was stably alleviated by the reduced R t , R re, and R ir , mainly due to constraining the internal pore fouling effectively.
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JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Xiaowen Sun,Qing-Nan Wang,Shengyang Wang,Pengfei Zhang,Zhendong Feng,Xianwen Zhang,Zhaochi Feng,Can Li
Photocatalytic selective oxidation of p -xylene with O 2 offers a mild pathway to synthesize p -methyl benzaldehyde ( p -MBA), which is one of the primary precursors in the manufacture of fine chemicals. Here, we report that Au/WO x /TiO 2 photocatalyst selectively catalyzes the oxidation of p -xylene to p -MBA with 88.6% selectivity at 1.0% conversion, the formation of CO x is suppressed to 0.8%. Kinetic experiments indicate that p -methylbenzyl alcohol and p -MBA are initial products. p -Methylbenzyl alcohol is further oxidized to form p -MBA, p -methylbenzyl acid and CO x ; p -MBA is further oxidized to p -methylbenzyl acid and CO x . On TiO 2 surface, p -methylbenzyl alcohol is more prone to directly combust to CO x by O 2 – . Loading of WO x can weaken the adsorption ability of p -methylbenzyl alcohol on the catalyst surface to avoid the combustion. Meanwhile, WO x and Au can facilitate the separation of photo-generated carriers to attain high activity and suppress the O 2 – formation to obtain high selectivity.
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Surfaces and Interfaces
·
2022
·
IF 6.137
Iltaf Khan,Aihua Yuan,Aftab Khan,Shoaib Khan,Sohail Khan,Sayyar Ali Shah,Waleed Yaseen,Yanjuan Cui,Xiaoping Shen,Xuyu Wang
In this novel research work, Cr 3+ incorporated and TiO 2 -modified porous SmFeO 3 -based nanocomposites are prepared via utilizing carbon nanosphere (CNS) as a hard template. Our experimental results proved that the introduction of porosity by employing a sequential template approach (STA) has upgraded the performances of SmFeO 3 nanoparticles. Remarkably, the incorporation of Cr 3+ increased the light absorption capability by generating surface states and regulating band gap positions, whereas the fabrication of TiO 2 enlarged surface area and enhanced charge separation by modulating high-level energy electrons (HLEEs). According to our experimental techniques, including TEM, HRTEM, SEM, TGA, BET, PEC, FS, and PL, it is demonstrated that most optimal 6Cr-PSFO and 4TiO 2 /6Cr-PSFO nanocomposites have high porosity, appropriate bandgap positions, large surface area, and show superior visible-light photocatalytic activities compared to pristine SmFeO 3 nanoparticles. Compared to pristine SFO, the activities of most active 4TiO 2 /6Cr-PSFO nanocomposites are improved by 8-fold for CO 2 conversion and 3-times for 4-chlorophenol (4-CP) degradation. The radical trapping experiment confirmed that the · OH i are the most active species and has a vital role in the photocatalytic degradation of 4-CP. Moreover, our experimental results are verified and consistent with theoretical calculations and computational studies. Finally, our research work will open up a new gateway for the designing of novel porous SmFeO 3 -based nanocomposites and their use in CO 2 conversion and pollutant removal.
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