JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Lejun Chen,Yonggang Lei,Yue Yang,Jianying Huang,Weiying Zhang,Kim Hoong Ng,Yuekun Lai
Metal-doping is a common strategy for establishing active sites on photocatalyst, but appropriately exposing them for maximized atomic utilization remains a great challenge in photocatalytic research. Herein, we propose a metal organic framework (MOF)-assisted approach to synthesis copper-modified titania (Cu-TiO 2 /Cu) photocatalyst with homogenously distributed and highly accessible active sites in its matrix. Significantly, an MOF precursor, namely NH 2 -MIL-125, with co-chelation of titania (Ti) and copper (Cu) was subjected to mild calcination, subsequently results in Cu-modified TiO 2 with highly accessible channels to its inner surface. These channels provide not only a large reactive surface (>400 m 2 g -1 ); they also enable facile modifying route for the pre-deposited Cu in prior to photoreaction. Specifically, NH 3 treatment was applied to partially reduce deposited Cu ions (Cu + and Cu 2+ ) into Cu nanoparticles, where their interplays realize improved optical properties and charge separation during photoreactions. Furthermore, the NH 3 -induced Cu nanoparticles could also serve as the adsorptive site for H + , thereby enabling 5629 μmol h -1 g -1 H 2 generation over the optimum photocatalyst of Cu 20 /TiO 2 /Cu 500 . Such performance is associated to 35.44 and 1.71-fold improvements compared to pure TiO 2 (Cu 0 /TiO 2 ) and untreated Cu-ion modified TiO 2 (Cu 20 /TiO 2 ), respectively. This work offers a new synthetic strategy for obtaining photocatalyst with evenly distributed and highly accessible active sites, thus improving the commensurability of photocatalytic H 2 generation from the industrial perspective.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Wei Wang,Cong Shen,Ruiqi Shao,Yanlong Zhu,Wenze Yu,Xianyan Wu,Wensheng Huang,Kai Li,Zhiwei Xu
Conventional photocatalysts utilized in the photodegradation of organic dyes are prone to cause agglomeration of nanocatalysts, which affects the photocatalytic efficiency and is difficult to recycle. In this paper, photocatalysts were rapidly loaded onto polypropylene (PP) meltblown nonwoven material fibers possessing a large specific surface area using water as a solvent and a one-step in situ growth method under ultrasonic conditions. That is, by ultrasonically and rapidly growing zeolite imidazolium skeleton material (ZIF-8) in situ on the surface of dopamine-modified PP meltblown fibers and directly doping carbon dots (CDs) modified TiO 2 during the in situ growth of ZIF-8, a CDs-TiO 2 /ZIF-8/PP composite photocatalytic material was formed. The microstructure, chemical structure, and photocatalytic performance of CDs-TiO 2 /ZIF-8/PP composite photocatalytic material were characterized. The findings indicated that the CDs-TiO 2 /ZIF-8 heterojunction nanocatalysts were effectively loaded onto the exterior of PP meltblown fibers. The CDs-TiO 2 /ZIF-8/PP composite photocatalytic materials exhibited highly efficient and synergistic photocatalytic degradation of the anionic dye Congo red (CR). Upon exposure to visible light, the degradation of CR could reach 99.1 % within 100 min and 99.6 % within 120 min. The first-order kinetic constant for photocatalytic degradation was measured to be 0.0419 min⁻ 1 . Furthermore, the photodegradation of CR by the CDs-TiO 2 /ZIF-8/PP composite photocatalytic material maintained about 85 % after 5 cycles. Finally, the mechanism of in situ deposition and photocatalytic activity of the nanocomposites on the fiber surface was proposed. The composite photocatalytic material can be recycled, and the preparation process is green, simple, and efficient, which has potential application prospects for industrial wastewater treatment.
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DOI
高影响因子
Journal of Natural Gas Chemistry
·
2012
·
IF 1.348
Lincai Peng,Junping Zhuang,Lu Lin
Effects of Zr/Ti molar ratio in SO 2− 4 /ZrO 2 -TiO 2 solid acid catalyst calcined at different temperatures on its surface properties and catalytic activity were thoroughly investigated in this paper. The physicochemical characteristics of prepared samples were determined by N2 adsorptiondesorption, XRD, NH3-TPD and XPS techniques, respectively. It was found that the crystallization temperature of the samples increased after the combination of ZrO 2 and TiO 2 ; and phase transformations from the anatase to the rutile of TiO 2 species and the tetragonal to the monoclinic of ZrO 2 species were effectively suppressed at higher temperature. The sample with a Zr/Ti molar ratio of 3/1 calcined at 450 °C showed the highest surface area and the most acid sites among all the tested samples. The acid site densities of samples were relatively closed to each other if they were calcined at the same temperature, however, decreased with the calcination temperature. The result indicates that the sulfur content in samples is a crucial factor to control the acid site density. Calcining the sample at 650 °C and higher temperatures resulted in a significant desorption of sulfate ion on the samples. The synthesized samples were evaluated as a potential catalyst for glucose conversion under the near-critical methanol conditions (200 °C/4 MPa). The results suggested that the relatively weaker acid sites of the catalyst were more favorable for the accumulation of methyl glucosides, while the moderate acid sites were responsible for the formation of methyl levulinate. The catalytic activity for methyl levulinate production almost increases linearly with the catalyst acid site density. The catalyst deactivation is due to the loss of sulfate ion and the two catalysts with Zr/Ti molar ratios of 3/1 and 1/3 could effectively alleviate the deactivation caused by sulfate solution in the reaction medium and can be reused after calcination with the reuse rate of over 90% in terms of the methyl levulinate selectivity.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Kun Wei,Xiu Yun Gu,En Zi Chen,You Qing Wang,Zhe Dai,Zi Ran Zhu,Shi Qiang Kang,Ao Chen Wang,Xiu Ping Gao,Geng Zhi Sun,Xiao Jun Pan,Jin Yuan Zhou,Er Qing Xie
SnO 2 /TiO 2 type II heterojunctions are often introduced to enhance the separation efficiency of photogenerated carriers in photoelectrochemical electrodes, while most of these heterojunctions are of core–shell structure, which often limits the synergistic effect from the two components. In this work, dissymmetric SnO 2 /TiO 2 side-by-side bi-component nanofibers (SBNFs) with tunable composition ratios have been prepared by a novel needleless electrospinning technique with two V-shape connected conductive channels (V-channel electrospinning). Results show that this V-channel electrospinning technique is more stable, controllable and tunable for the large-scale preparation of SBNF materials compared to the traditional electrospinning using two side-by-side metal needles. And these SnO 2 /TiO 2 SBNFs are dissymmetric and comprised of a tiny SnO 2 NF (tunable diameter within 20–80 nm) and a Sn-doped TiO 2 NF (diameter of ~ 250 nm) with a side-by-side structure. Moreover, the dye-sensitized solar cells (DSSCs) based these dissymmetric SnO 2 /TiO 2 SBNFs show the maximum power conversion efficiency (PCE) of 8.3%, which is 2.59 times that of the ones based on the TiO 2 NFs. Series of analyses indicate that the enhancements in PCE could mainly be due to the improved electron transport via SnO 2 NFs and the enhanced carrier separation via dissymmetric SnO 2 /TiO 2 heterojunction interface. This research will give some new insight in the preparation of SBNFs for high-performance photoelectrochemical devices.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xuejiao Wang,Xupeng Zhu,Huimin Shi,Yiqin Chen,Zhiquan Chen,Yixuan Zeng,Zhixiang Tang,Huigao Duan
Seeking for ultrasensitive and low-cost substrates is highly demandable for practical applications of surface-enhanced Raman scattering (SERS) technology. In this work, we report an ultrasensitive SERS-active substrate based on wet-chemistry-synthesized vertically aligned large-area TiO2 nanosheets (NSs) decorated by densely packed gold nanoparticles (Au NPs) with sub-5 nm gaps. Via a multistep successive deposition process, three-dimensional-stacked Au NPs sandwiched by a 3 nm SiO2 layer were assembled onto the TiO2 NS, enabling numerous hotspots due to the formation of both ultratiny plasmonic gaps and semiconductor/metal interfaces. Experimental results show that the fabricated substrate displays a detection limit down to 10 fM (10–14 M) without involving any condensation process by using the crystal violet as probe molecules. Control experiments and electromagnetic simulations indicate that the nanogaps defined by the 3 nm spacer are essential for the obtained excellent SERS performance. With its ultrasensitive detection capability, we demonstrate that the fabricated SERS substrate can be used for the trace analysis of melamine in milk.
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Linjuan Pei,Xianmo Gu,Yantao Zhang,Jie Wang,Hao Tan,Pengfei Wang,Zhanfeng Zheng
To improve the photocatalytic performance of TiO 2 and make it easier to recycle, the titanosilicate@anatase core-shell micro-nanostructure photocatalysts were designed. The titanosilicate@anatase core-shell micro-nanostructure was fabricated by a two-step method: an acid-assisted hydrothermal treatment of the hydrogen-form natisite and a subsequent calcination . In the first step, the dissolution and recrystallization of Ti species led to the formation of TiO 2 shell over the titanosilicate; in the second step, the calcination not only facilitated the formation of Ti−O−Si bond, but also improved the crystallization of TiO 2 shell. The rutile TiO 2 was not detected even at 900 °C, which could be attributed to the strong interaction between TiO 2 nanocrystals and the titanosilicate core through Ti−O−Si bond at the interface. The formation of Ti−O−Si bond also changed the surface characteristic of the TiO 2 shell, which facilitated the enrichment of RhB dye molecules around the catalyst and induced the fast production of the O 2 •− . The collaboration of the core and the shell contributed to the quick degradation of RhB under visible light and the excellent recycling performance. The growth kinetics of the core-shell micro-nanostructure has been studied in detail, which provided a novel and facile synthesis strategy for the fabrication of TiO 2 micro-nanostructure easy to be recycled.
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高影响因子
Sustainable Energy & Fuels
·
2024
·Vol. 8
·期 13
·2889-2899
·
IF 5
Jiaqi Wang,Hongyang Huo,Guozhe Sui,Shuang Meng,Dongxuan Guo,Shanshan Fu,Dantong Zhang,Xue Yang,Jinlong Li
The development of visible-light-active photocatalysts with high performance has been regarded as a promising way to address environmental wastewater issues. In this work, a highly efficient g-C3N4/CdS/TiO2 ternary Z-type heterojunction photocatalyst with a hollow structure has been fabricated using a step-by-step self-assembly strategy, which demonstrates excellent photocatalytic performance under visible light and removes various water-soluble organic pollutants effectively. The photocatalytic degradation efficiency of 20-g-C3N4/CdS/TiO2-10 against rhodamine B (RhB) is found to be 29.8 times higher than that of the pristine g-C3N4 within 90 minutes of visible light irradiation attributed to the active species of ˙O2− and h+. Liquid chromatography mass spectrometry results suggest that the degradation pathway of RhB involves main steps such as N-de-ethylation, chromophore cleavage, ring opening, and mineralization. A series of characterization analyses, combined with the observed enhanced photocatalytic performance, indicate that the g-C3N4/CdS/TiO2 ternary heterojunction benefits from the rapid transport and separation of photogenerated carriers facilitated by the formation of a heterointerface. Furthermore, the g-C3N4/CdS/TiO2 ternary heterojunction exhibits favorable stability, with 88.1% degradation efficiency after five cycles of degradation experiments. This work provides novel insights into the preparation and application of ternary heterojunctions with superior photocatalytic performance for eliminating organic pollutants from wastewater.
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DOI
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Wen-Sheng Zou,Mochi Hong,Wei-Li Kong,Qing-Chun Zhao,Weihua Li,Yaqin Wang
The photocatalytic efficiency of TiO2 greatly suffers from the rapid recombination of photogenerated electron–hole (e–_h+) pairs, small specific surface area, and a large band gap. Self-doping can effectively improve the photocatalytic activity of TiO2. In this work, black Ti3+ self-doped TiO2 mesoporous nanotubes/N-doped carbon/Co nanoparticles (Ti3+-d-TiO2 MNTs/N-d-C/Co NPs) were successfully synthesized through the reduction of TiO2 MNTs by a Co2+–l-histidine (Co-l-his) complex at 800 °C under ordinary pressure and an inert atmosphere. The as-prepared ternary photocatalyst owned a narrower band gap of ∼2.6 eV, relatively high specific surface area of ∼91.0 m2 g–1, and average pore size of ∼12.4 nm. In comparison with the pristine TiO2 MNTs, the ternary photocatalyst exhibited a solar-driven photocatalytic hydrogen evolution rate of ∼3.9 mmol g–1 h–1, which was about ∼4 times than that of the pristine TiO2 MNTs of ∼0.9 mmol g–1 h–1, and enhanced capability of photocatalytic degradation of tetracycline. These improvements could be ascribed to the Ti3+ self-doping, formation of oxygen vacancy, and narrowed band gap of ∼2.6 eV, expanding the optical response to the visible light region, enhancing the separation efficiency of the photogenerated charge carriers. Meanwhile, the N-d-C/Co NPs could not only adsorb tetracycline and water molecules but also activate water molecules and promote H–OH cracking. As a result, enhanced solar-driven hydrogen evolution and tetracycline degradation were achieved.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Shuyi Shen,Tao Ke,Dike Fang,Daohui Lin
Visible-light-driven photocatalysts with synergistic persulfate (PS) activation and photocatalysis possess enormous pollution-control potential. Herein, nitrogen and sulphur co-doped TiO 2 @C hybrid (N/S-TiO 2 @C) featuring the complementary visible-light photocatalysis and synergetic PS activation was synthesized by in situ oxidation of Ti 3 C 2 MXene and thereafter co-doping with N and S. Both anatase and rutile phases of TiO 2 were attained in N/S-TiO 2 @C. The decrease of TiO 2 bandgap (about 1.81 eV) and the defect of carbon layer caused by the N and S co-doping in both TiO 2 crystal and carbon layer enabled the synergistic enhancement of PS activation and photocatalysis. Complete degradation and 93.4% mineralization of sulfamethoxazole (SMZ, 10 mg/L) were achieved by dosing PS (2 mM) and N/S-TiO 2 @C (0.4 g/L) under visible light within 30 min. The degradation rate by N/S-TiO 2 @C through PS activation under visible light was 27.9-, 11.1-, and 2.30-fold higher than that by PS, N-TiO 2 @C, and S-TiO 2 @C alone, respectively. Reactive species SO 4 − , 1 O 2 , OH, and O 2 − , especially the former two, were determined dominating the SMZ degradation, and the degradation pathways were illustrated through intermediates identification. Moreover, N/S-TiO 2 @C kept excellent performance in activating PS to degrade SMZ in real water samples. These results indicate that N/S-TiO 2 @C is a stable and promising PS activator under visible light and has a good application potential in organic wastewater treatment.
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2018
·
IF 2.891
Xiufang Cao,Jingqi Tao,Xin Xiao,Junmin Nan
The TiO 2 and copper-containing TiO 2 (Cu-TiO 2 ) micro/nanostructures are synthesized using a multi-element-doping route, and their visible-light-induced photocatalytic degradation of tetracycline hydrochloride (TC) is evaluated. Using metallic Ti powders with impurities as raw material, these two cauliflower-like micro/nanostructures can be hydrothermally synthesized through a dissolution and hydrolysis process in the NH 4 HF 2 solution and NH 4 HF 2 +CuSO 4 solution, respectively. Then, after a calcining treatment at 600 °C for 2 h, their phase compositions can be transformed from anatase to mixed anatase-rutile, the optical absorption edges are decreased from 452 and 439 nm to 569 and 581 nm, respectively. The apparent reaction rate constants for the photodegradation reaction of TC over the calcined TiO 2 and Cu-TiO 2 samples, which can be described by pseudo-first-order kinetics model, are increased from 0.00313 min −1 and 0.00407 min −1 to 0.00468 min −1 and 0.00978 min −1 , respectively. The enhanced photocatalytic degradation abilities of these TiO 2 and Cu-TiO 2 are attributed to their unique mixed phase composition and optical properties, and the trace doped Fe, Cu, F and N elements in their structure.
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高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 19
·9402-9411
·
IF 8.867
Feilong Cai,Liyan Yang,Yu Yan,Jinghui Zhang,Fei Qin,Dan Liu,Yi-Bing Cheng,Yinhua Zhou,Tao Wang
Fabrication of efficient, hysteresis-free perovskite solar cells with stabilized power output in a planar heterojunction configuration via a low-temperature solution process remains a big challenge. Herein, we report an effective approach to prepare high performance n–i–p type planar heterojunction perovskite solar cells with eliminated hysteresis and stabilized power output over 20% via compositional and surface modifications to a low-temperature-processed TiO2 electron-transport layer (ETL). The fullerene derivative layer between the ETL and perovskite layers significantly improves electron extraction and suppresses charge recombination by reducing trap density at the ETL interface. This work manifests the presence of diffused TiO2/fullerene and fullerene/perovskite interfaces as an efficient interfacial engineering strategy to prepare high-performing perovskite solar cells.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Zhongren Zhou,Peng Dong,Deyu Wang,Meng Liu,Jianguo Duan,G.P. Nayaka,Ding Wang,Cunying Xu,Yixin Hua,Yingjie Zhang
In this paper, a facile metallurgical method named molten salt electrolysis was introduced to synthesize silicon-titanium nanocomposite that was used as the anode for lithium-ion batteries (LIBs). Simply utilizing SiO 2 and TiO 2 mixture as the raw materials, upon the direct electrolysis in the molten salt chamber, the oxide precursor was reduced constantly to the complete production of silicon-titanium nanocomposite. Benefiting from the compositional and structural advantages of sample, the as-obtained silicon-titanium anode delivered enhanced reversible specific capacity and good cycling stability such as the initial discharge capacity of 1410.5 mAh g −1 with the columbic efficiency of 80.72% and reversible 638.1 mAh g −1 with a high retention of 92.2% just after the anode cycling for 50 times. The average specific capacity fading percentage was only 0.16% per cycle between the 4 th to 50 th cycles, the result of which showed a good electrochemical performance for lithium ion storage.
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高影响因子
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