Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121939
·
IF 7.5
Yu Liu,Jinhai Xu,Shusu Shen,Xiaoji Zhou,Dapeng Liu,Ganwei Zhang
The development of photocatalytic self-cleaning membranes represents a promising strategy for addressing membrane fouling in dye wastewater treatment. NH 2 -MIL-88B(Fe) (NM88B) possesses excellent chemical stability, hydrophilicity and inherent photocatalytic activity, its practical application is limited by the low carrier mobility and the rapid recombination of photogenerated electron-hole pairs. In this experiment, NM88B@TiO 2 was synthesized by in-situ growth method, and was constructed to enhance charge separation and photocatalytic efficiency, and then NM88B@TiO 2 /polyvinylidene fluoride (PVDF) mixed matrix membranes (MMMs) were fabricated using the non-solvent induced phase separation (NIPS) method. The loading capacity of NM88B@TiO 2 could reach up to 2 %. The optimal membrane has a porosity of 86.02 %, which is 63 % higher than that of the original PVDF (52.78 %). The pure water permeability of the optimal membrane is 52.87 L·m −2 ·h −1 ·bar −1 , 2.5 times that of the original membrane. The water contact angle decreased from 85.6° to 40.4°, making the membrane highly hydrophilic. In the anti-BSA fouling experiment, the flux recovery rate (FRR) of the optimal membrane still maintained above 75 % even after 6 cycles, demonstrating excellent antifouling ability and also reusability. Moreover, the membrane showed a good rejection rate for various dyes. Additionally, this membrane exhibited excellent photocatalytic self-cleaning ability. After 7 photocatalytic self-cleaning cycles, the membrane permeability basically returned to its initial state, and the membrane maintained a good CR rejection rate (>90 %). During the continuous 72-hour CR filtration process, the permeability and rejection rate remained unchanged. These results highlight the potential of the NM88B@TiO 2 modified PVDF membrane as a photocatalytic self-cleaning membrane for treating wastewater containing dyes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
·
IF 9.2
Wanyu Li,Muzi Liu,Xiangyu Xin,Yu Xiao,Jinping Li,Guang Liu
MgH 2 is recognized as an exceptionally promising solid-state material for hydrogen storage, but its high thermodynamic stability, slow kinetics, and cycling-induced particle coarsening remain major obstacles to practical application. In this study, a composite oxide catalyst, Nb 2 O 5 @TiO 2 -C, was synthesized via a hydrothermal route by loading nano-Nb 2 O 5 onto a TiO 2 -C support derived from a Ti-based metal- organic framework. Doping with Nb 2 O 5 @TiO 2 -C markedly enhances the hydrogen storage performance of MgH 2 . Carbon within the support effectively suppresses nanoparticle agglomeration, while the catalyst is partially reduced to low-valence species during de/rehydrogenation cycles, both contributing to the enhanced performance. The MgH 2 -7 wt.% Nb 2 O 5 @TiO 2 -C composite starts dehydrogenating at 210.6 °C. At 300 °C, it rapidly releases over 6 wt% hydrogen within 5 min. The dehydrogenated sample also exhibits fast absorption kinetics, absorbing 6 wt% hydrogen within 1 min at 200 °C under 30 bar H 2 . Moreover, the system shows excellent cycling stability, retaining a hydrogen capacity of 6.6 wt% after 20 cycles.
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Journal of Water Process Engineering
·
2026
·
IF 6.7
Tariq Ali,Yiwei Li,Yuxian Wu,Yuke Zhang,Bingjie Fang,Saleem Raza,Ruidi Chen,Yeyuan Xiao
Photocatalytic technology offers a promising solution for degrading organic pollutants in wastewater. However, catalysts often suffer from limited light absorption and rapid electron-hole recombination. To address the challenges, we developed a heterogeneous TiO 2 /CoAl-LDH catalyst for photocatalytic degradation of dyes such as Acid fuchsin (AF) and methyl orange (MO) and real wastewater under UV light irradiation. The aligned band structures of TiO 2 and LDH enhanced UV light energy absorption and electron-hole separation, resulting in superior photocatalytic activity. In treating real dyeing wastewater, TiO 2 /CoAl-LDH + H 2 O 2 + UV achieved higher decolorization than UV/H 2 O 2 or catalyst/H 2 O 2 alone under the same operating conditions. The process within the early stage (0–45 min) followed pseudo-first-order kinetics (kₐₚₚ ≈ 1.50 × 10 −2 min −1 ), with a clear H 2 O 2 optimum at 40.8 mM. Excitation–emission matrix (EEM) fluorescence showed rapid quenching of protein-like (B/T) and humic/fulvic-like (A/M/C) peaks with blue-shifts under the TiO 2 /CoAl-LDH + H 2 O 2 + UV condition corroborating deeper oxidation and mirroring the ADMI decolorization trend (fast loss of B/T within 15 min, followed by progressive depletion of humic-like emission). This study presents a simple and cost-effective method for developing efficient hierarchical semiconductor materials potentially applicable as photocatalysts for wastewater treatment.
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Green Energy & Environment
·
2026
·
IF 14.6
Chunxia Wang,Yanxin Sun,Zhuo Wang,Yifeng Zeng,Qin-Yi Li,Xinchen Kang,Guoyong Huang
Copper (Cu) doping modifies the band structure of TiO 2 by slightly narrowing the bandgap and shifting the Fermi level, while creating localized states that serve as temporary electron reservoirs to suppress carriers rapid recombination. On this basis, a ternary heterojunction Cu-TiO 2 /g-C 3 N 4 (Cu-CT) was constructed by anchoring Cu-TiO 2 onto g-C 3 N 4 nanosheets. The synergistic interaction between Cu-doping and the S-scheme interfacial configuration generates an internal electric field that promotes vectorial carrier migration, enabling electrons in the conduction band of Cu-TiO 2 and holes in the valence band of g-C 3 N 4 . This spatial separation preserves strong redox potentials and markedly suppresses recombination. Consequently, Cu-CT achieves a hydrogen evolution rate of 10.21 mmol g -1 h -1 , more than twenty times higher than pristine TiO 2 . In-situ XPS, KPFM, and DFT analyses collectively validate the S-scheme charge-transfer pathway and highlight the synergistic role of Cu doping with heterojunction engineering, providing mechanistic insights to the rational design of advanced ternary photocatalysts for efficient solar-driven hydrogen production.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.6
Jinxu Song,Jiangwen Xu,Haotian Li,Hui Song,Hongyi Li,Jinshu Wang
The corrosion protection performance differences between TiO 2 nanotubes of varying diameters combined with the same corrosion inhibitor were investigated. TiO 2 nanotube arrays with distinct diameters were grown in-situ on a titanium substrate by adjusting the anodic oxidation voltage. Subsequently, a stearic acid composite coating was formed on the array surface via a chemical bath process. The electrochemical corrosion resistance, fouling resistance, and self-healing behavior of this superhydrophobic composite coating were comprehensively evaluated in both air and solution environments. In-situ monitoring of surface corrosion evolution at different interfaces in 7 days was performed using scanning vibrating electrode technology. Results indicate that, under identical corrosion inhibitor loading, the coating's corrosion protection performance is significantly influenced by TiO 2 nanotube diameter. Furthermore, the nanotube array exhibits the capacity to store stearic acid, which is released upon coating damage, conferring self-healing properties to the interface in both air and solution environments. This study provides novel insights for the design of corrosion inhibitor carrier structures and self-healing anti-corrosion coatings.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121314
·
IF 7.2
Gangye Cen,Weiqun Chu,Jianfeng Lu,Jing Ding,Yukun Hu,Weilong Wang
Photocatalytic reduction of CO 2 to methanol using water as a proton source offers a sustainable pathway for solar energy storage and carbon neutrality. However, its practical application is hindered by low quantum efficiency, rapid charge recombination, and reliance on sacrificial agents. Herein, we developed a bimetallic AuCu alloy supported on TiO 2 nanoparticles (AuCu-TiO 2 ) via a NaBH 4 reduction method for efficient CO 2 -to-methanol conversion in the absence of sacrificial agents. The photocatalytic performance was correlated with in situ FTIR spectroscopy to unravel the synergistic roles of AuCu alloy sites and TiO 2 in mediating CO 2 reduction and H 2 O oxidation. CO 2 activation by photogenerated electrons leads to the formation of critical intermediates like COOH* and CHO*, which undergo sequential hydrogenation to produce methanol. The Au-Cu synergy facilitates the hydrogenation of COOH* to CHO*, significantly boosting methanol selectivity. By optimizing the AuCu loading and Cu/Au molar ratio, the AuCu-TiO 2 catalyst achieved a high methanol production rate of 63.31 μmol g −1 h −1 with 85.59 % selectivity. This work provides a general strategy for designing efficient bimetallic photocatalysts for selective CO 2 conversion under environmentally benign conditions.
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ACS Nano
·
2026
·
IF 16
Zhiwei Chen,Hongru Zhou,Yan Liang,Zhaolin Dou,Xiaoyu Liang,Jingxuan Yang,Fanhao Kong,Min Wang
Photocatalytic biomass conversion offers a sustainable route for jet fuel production under mild conditions, while controlling the selectivity of products remains a long-standing challenge because of the involvement of various radical intermediates. Herein, we report a strategy to achieve selective switching toward jet fuel (C8–C18 hydrocarbons) in the photocatalytic decarboxylation of biomass-derived fatty acids by regulating hydrogen radical transfer on TiO2 surfaces. By modulating the valence states of Rh cocatalysts, we spatially orient radical intermediates to guide their reaction pathways: oxidized Rh (Rh3+) promotes decarboxylative hydrogenation (yielding Cn–1 alkanes), while reduced Rh (Rh0) drives decarboxylative C–C coupling (forming C2n–2 alkanes). This approach enables selective conversion of a broad range of biomass-derived acids, including fatty acids, aromatic acids, branched-chain fatty acids, and naphthenic acids, into target jet fuel hydrocarbons. This work provides an effective strategy for directing reaction pathways through spatial control of radical intermediates, advancing the development of sustainable biomass upgrading technologies.
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PubMed
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JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xing Du,Xuan He,Lei Zhao,Hui Chen,Weixin Li,Wei Fang,Wanqiu Zhang,Junjie Wang,Huan Chen
It reported a novel and simple method for the first time to prepare TiO 2 hierarchical porous film (THPF) using ultrastable foams as a soft template to construct porous structures . Moreover, dodecanol as one foam component was creatively used as solvent during the synthesis of CdSe quantum dots (QDs) to decrease reaction temperature and simplify precipitation process. The result showed that hierarchical pores in scale of microns introduced by foams were regarded to benefit for high coverage and unimodal distribution of QDs on the surface of THPF to increase the efficiencies of light-harvesting, charge-collection and charge-transfer. The increased efficiencies caused an enhancement in quantum efficiency of the cell and thus remarkably increased the short circuit current density ( J sc ). In addition, the decrease of charge recombination resulted in the increase of the open circuit voltage ( V oc ) as well. The QDSSC based on THPF exhibited about 2-fold higher power conversion efficiency ( η = 2.20%, J sc = 13.82 mA cm −2 , V oc = 0.572 V) than that of TiO 2 nanoparticles film (TNF) ( η = 1.06%, J sc = 6.70 mA cm −2 , V oc = 0.505 V). It provided a basis to use foams both as soft template and carrier to realize simultaneously construction and in-situ sensitization of photoanode in further work.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Kaifu Zhang,Wei Zhou,Xiangcheng Zhang,Bojing Sun,Lei Wang,Kai Pan,Baojiang Jiang,Guohui Tian,Honggang Fu
The recycle and light-harvesting of powder photocatalysts in suspended system are bottlenecks for practical applications in photocatalysis. Herein, we demonstrate the facile synthesis of self-floating amphiphilic black TiO 2 foams with 3D macro-mesoporous architectures through freeze-drying method combined with cast molding technology and subsequent high-temperature surface hydrogenation. Ethylenediamine plays bifunctional roles on acid-base equilibrium and “concrete effect” on stabilizing the 3D macro-mesoporous networks against collapsing, which also inhibit the phase transformation from anatase-to-rutile and undesirable grain growth during hydrogenation at 600 °C. The resultant black TiO 2 foams, which can float on the water, extend the photoresponse from UV to visible-light region and exhibit excellent solar-driven photocatalytic activity and long-term stability for complete mineralization of floating insoluble hexadecane and some typical pesticides. Especially for floating contaminant hexadecane, the photocatalytic reaction apparent rate constant k is ∼7 times higher than that of commercial Degussa P25 under AM 1.5 irradiation. This enhancement is attributed to the 3D macro-mesoporous networks facilitating mass transport, the super amphiphilicity benefiting rapid adsorption, the floating feature and Ti 3+ in frameworks favoring light-harvesting and spatial separation of photogenerated electron-hole pairs. The novel self-floating photocatalyst will have real practical applications for mineralizing floating contaminants in natural environment.
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Progress in Natural Science-Materials International
·
2012
·Vol. 22
·期 4
·265-272
·
IF 1.099
Lei Chen,Duan Weng,Zhichun Si,Xiaodong Wu
WO 3 –CeO 2 –TiO 2 catalysts for NO (nitrogen monoxide) reduction by ammonia were prepared by a sol–gel method. The catalysts were characterized by BET, XRD, Raman, NH 3 /NO adsorption and H 2 -TPR to investigate the relationships among the catalyst composition, structure, redox property, acidity and deNO x activity. WO 3 –CeO 2 –TiO 2 catalysts show a high activity in a broad temperature range of 200–480 °C. The low-temperature activity of catalysts is sensitive to the catalyst composition especially under low-O 2 -content atmospheres. It may be related to the synergistic effect between CeO x and WO x in the catalysts. On one hand, the interaction between ceria and tungsten oxide promotes the activation of gaseous oxygen to compensate the lattice oxygen consumed in NH 3 -SCR (selective catalytic reduction) reaction at low temperatures. Meanwhile, the Brønsted acid sites mainly arise from tungsten oxides, Lewis acid sites mainly arise from ceria. Both of the Brønsted and Lewis acid sites facilitate the adsorption of NH 3 on catalysts and improve the stability of the adsorbed ammonia species, which are beneficial to the NH 3 -SCR reaction.
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IONICS
·
2019
·Vol. 25
·期 9
·4509-4516
·
IF 2.289
Wang Shuo,Zhu Yu,Liu Bao,Wang Chengyan,Ma Ruixin
Recently, perovskite solar cells (PSCs) have attracted more attention. TiO 2 as the most common electron transfer material in PSCs has been improved by a serious of methods. In this study, a simple method was used to improve the traditional compact TiO 2 properties by doping with Sn 4+ . It demonstrated that the conductivity of the TiO 2 film could be well improved and the band-gap shifted from 3.65 to 3.55 eV with the introduction of Sn ions. The Sn–O–Ti bond was observed in the Sn:TiO 2 film according to the results of XPS. The mesostructured PSCs based on Sn:TiO 2 exhibited negligible J-V hysteresis behavior, and the J sc of the device increased distinctly. The power conversion efficiency (PCE) of the Sn:TiO 2 device was improved from 14.86 to 17.11%, compared with the reference device.
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CERAMICS INTERNATIONAL
·
2019
·Vol. 46
·期 3
·3400-3405
·
IF 3.45
Dehua Ma,Luyi Zhu,Benxue Liu
Improving the infrared reflectivity of ZrO 2 polycrystalline fibers is of great benefit to its thermal applications. In the present research, we cast a highly uniform TiO 2 coating with a thickness ranging from dozens to hundreds of nanometers on ZrO 2 fibers by utilizing hydrothermal growth. The coating bonds tightly to the ZrO 2 fibers via Zr–O–Ti chemical linkages, and the thickness of the coating can be tailored by varying the hydrothermal growth time. The TiO 2 coating, acting as a sheath towards electromagnetic radiation, not only reflected light with wavelengths ranging from the visible region to the infrared region and up to 8 μm but also shielded the Raman signals of the ZrO 2 fibers. The present research provides an efficient way to cast controllable and uniform coatings on flexible fiber materials. The obtained ZrO 2 fibers coated with TiO 2 may have applications such as reinforcement for bulk ceramics, thermal barrier coatings , aerogels , etc. , thus performing the dual functions of mechanical strengthening and thermal insulation .
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