POLYMER ENGINEERING AND SCIENCE
·
2024
·
IF 3.2
Xiaohui Wang,Xinmei Li
To address the escalating issue of oily wastewater, separation membranes with special wettability on the surface are widely used in oil–water separation. The development of separation membranes with not only stable separation flux but also anti-fouling properties is an urgent problem. Therefore, polystyrene/polyacrylonitrile-polyvinylidene fluoride/polydimethylsiloxane-titanium dioxide nanoparticle (PS/PAN-PVDF/PDMS@TiO 2 ) composite membranes with superhydrophobicity and lipophilicity were prepared by electrospinning technique. By changing the doping amount of TiO 2 nanoparticles, the multilevel rough structure was constructed on the surface, and the transformation of the Ti–O–C chemical bond to the Si–O–Ti chemical bond was realized inside the composite membrane. The results showed that the composite membrane had excellent superhydrophobicity (154.9°) and mechanical properties (tensile strength of 3.54 MPa, elongation of 60.95%). The membrane can absorb ultraviolet light and exhibits enhanced resistance to fouling when exposed to visible-UV light. Additionally, the composite membrane demonstrates an adsorption capacity of 30–100 g/g for a wide range of oils. In corrosive environments, the composite membrane maintains superhydrophobicity (above 150°) and achieves high oil–water separation efficiency (97%). After 40 cycles, the separation flux of 6000 L.h −1 m −2 can be maintained. Hence, superhydrophobic oleophilic composite membranes with a stable separation flux and resistance to fouling can be employed in the field of oil–water separation. Highlights PS/PAN-PVDF/PDMS@TiO2 composite membrane with multilevel rough structure. PS/PAN-PVDF/PDMS@TiO2 composite membrane with excellent UV absorption and self-cleaning ability. PS/PAN-PVDF/PDMS@TiO2 composite membrane with stable oil–water separation efficiency in harsh environments.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-12
·
IF 4.259
Xiong Zhu,Lin Haibo,Liu Fu,Xiao Peng,Wu Ziyang,Li Tiantian,Li Dehong
Instability of superwetting surface is the stumbling block of flexible polymeric membranes for continuous separation of water-in-oil or oil-in-water emulsions. Manipulation of rigid superwetting nano-TiO 2 on hierarchical poly(vinylidene fluoride) (PVDF) membrane by mimicking the plant roots holding soil behaviour enabled the generation of robust superwetting surface withstanding the harshly physical and chemical torture. The unique interface combination, which fabricated by a compacted nano-layer with the thickness of ~20 μm, was disclosed by systematic structure characterization. As demonstrated by SEM, LSCM and nano-CT, the pristine PVDF membrane with large quantities of cilia-like micro/nano-fibrils can function as the plant roots to capture, cage and confine the nanoparticles to form a robustly rigid nano-coating. The as-prepared membranes showed excellent durable separation performance both in varieties of stabilized water-in-oil and oil-in-water emulsion separation for a long term with few nanoparticles loss in a continuous crossflow mode. The strategy of assembling rigid inorganic nano-particles on flexible surface offers a window of opportunity for preparation of robust organic-inorganic hybrid membranes not only for continuous oil/water emulsion separation, but also for other functional application, such as electric conduction, heat conduction, ion exchange, and in membrane catalytic reactors etc.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2025
·
IF 5.1
Bo Li,Lipan Luo,Yujia Liu,Xiaohan Zhou,Yuyu Zhang,Lishuai Song,Nan Liu,Qing Tang,Zequan Li
Pt/TiO2 photocatalysts were synthesized using incipient wetness impregnation followed by oxidative and/or reductive thermal treatments. The loading dimensions of Pt elements on the TiO2 surface (PtP, PtSA, and PtC) were controlled by varying the impregnated solution. Experimental results demonstrate that PtC with intermediate size exhibits the highest photolysis rate under 300W xenon lamp irradiation, achieving a hydrogen yield of 11.42 mmol g^-1 h^-1 and an apparent quantum yield of 40.65%. Similarly, Ru/TiO2 and Ir/TiO2 photocatalysts prepared under the same conditions exhibited the same pattern. Photoelectrochemical tests reveal that PtC/TiO2 has the narrowest band gap, the highest interfacial charge transfer capacity, and the greatest carrier separation efficiency. DFT calculations indicate that PtC/TiO2 has the most suitable d-band center, resulting in a close-to-zero ΔGH* value of 0.05 eV. This optimal value significantly balances the adsorption and desorption of hydrogen intermediates (H*) during the photocatalytic hydrogen evolution (PHE) reaction. This study provides new insights into the preparation of precious metal-loaded photocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THIN SOLID FILMS
·
2017
·
IF 1.879
Lixin Song,Jifeng Zhai,Pingfan Du,Jie Xiong,Frank Ko
TiO 2 nanorods (NRs), Mg 2 + doped TiO 2 (Mg 2 + /TiO 2 ) NRs, and carbon nanotubes incorporated TiO 2 (CNTs/TiO 2 ) NRs are fabricated from the corresponding electrospun nanofibers (NFs) by ultrasonic treatment , respectively. Then these NRs are made into various photoanodic films through electrospray deposition and hot-compression for flexible dye-sensitized solar cells (FDSSCs). The conversion efficiency of FDSSCs is improved with the CNTs incorporation or the Mg 2 + ions doping of TiO 2 . To further improve the properties of FDSSCs, various bilayer photoanodic films made of the smaller diameter NRs as under-layer and the larger diameter NRs as over-layer are prepared. Finally, a highest conversion efficiency of 3.9% is obtained using the bilayer NRs film composed of the smaller diameter CNTs/TiO 2 NRs and the larger diameter Mg 2 + /TiO 2 NRs. This efficiency is much higher than that of the single-layer NRs film based FDSSCs. This may be attributed to the increased light harvesting resulting from the scattering layer of the larger diameter NRs and the faster electron transport due to the two-level energy steps of the bilayer NRs film.
研究领域:
材料科学
·
纳米技术
·
光伏学
·
能源材料
✓ 已验证
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 2
·207
·
IF 3.52
Hua Nie,Wei Li,Qirong Wu,Vladislav Rac,Vesna Rakić,Xuesen Du
Poisoning effects by alkali metal chlorides is one of the major reasons for the deactivation of SCR catalyst in biomass-fired plants. In this study, the influence of KCl on two vanadium-based catalysts with different promoters, V2O5-WO3/TiO2and V2O5-Ce(SO4)2/TiO2, was investigated. The catalytic activity of the fresh V2O5-WO3/TiO2was higher than that of V2O5-Ce(SO4)2/TiO2at low temperatures. V2O5-Ce(SO4)2/TiO2performed better than V2O5-WO3/TiO2when KCl was deposited on the catalyst surface. Both poisoned catalysts were efficiently regenerated by SO2treatment. The characterization results show that the reducibility and acidity of the catalysts were weakened by KCl deposition but regenerated by SO2.
研究领域:
环境催化
·
大气污染控制
·
材料化学
·
工业催化
·
能源工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yunning Chen,Lu Yang,Yingnan Sun,Renquan Guan,Di Liu,Jie Zhao,Qingkun Shang
A CDs@Cu-HQCA/TiO 2 flower composite photocatalyst (CDs: carbon dots, HQCA : 8-hydroxyquinoline-5-carboxylic acid) was constructed by exploiting the synergy of complex-sensitization, TiO 2 -morphology control, and carbon dot-surface modification. The photocatalytic degradation of phenol, norfloxacin, tetrabromobisphenol A and Cr (VI) by Cu-HQCA/TiO 2 particle, tube, diamond and flower-like show that the Cu-HQCA complex effectively extends the visible light absorption range of composite photocatalysts, and the flower morphology of TiO 2 not only improves the adsorption of pollutants but also enhances the photoelectric response of the composite photocatalyst. In this manner, a CDs@Cu-HQCA/TiO 2 flower catalyst that demonstrates excellent performance for the removal of dexamethasone, which does not degrade well naturally, was prepared, which delivered a rate of degradation of 99.4% and a degree of mineralization of 77.4% for dexamethasone. Possible degradation sites and dexamethasone degradation products were studied by combining computational chemistry with high-resolution mass spectrometry, and a possible mechanism for photogenerated carrier transmission and separation in the CDs@Cu-HQCA/TiO 2 flowers is proposed.
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2021
·
IF 8.001
Xiping Sun,Mengmeng Yi,Bing Feng,Ruowang Liu,Lijuan Sun,Lanlan Zhai,Hongwei Cao,Chao Zou
To synthesize PEG@TiO2 with excellent energy storage properties, polyethylene glycol (PEG) was in situ encapsulated for the first time into the pores of three-dimensional (3D) porous TiO2. PEG was surrounded by the hydrolysable precursor of TiO2 and wrapped in the pores of 3D nanoporous TiO2 skeleton after the hydrolysis and condensation of the precursor, which was utterly different from that PEG was passively absorbed into the pores through physical impregnation method adopted by the present references. The 3D TiO2 framework provided excellent shape stability and inhibited the outleakage of the melted PEG. The weight percentage of the encapsulated PEG was approximately 92 wt% of PEG@TiO2 composite. The phase transition enthalpies of the crystallization and melting processes of the composite were 147.1 J/g and 153.3 J/g, which approached those of the pure PEG. Besides, the thermal conductivity value of PEG@TiO2 was 0.39 W/(mK), about 26% enhancement compared with that of pure PEG. The enthalpies of crystallization and melting processes decreased only by 0.1% and 0.2% after 100 thermal cycles. This study revealed that PEG@TiO2 composite exhibited unique energy storage properties such as energy storage capability, thermal stability, thermal reliability and thermal conductivity.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 21
·18059-18066
·
IF 2.324
Li Zhen,Yu Libo,Song Hai,Feng Lei,Wang Xingpeng
TiO 2 nanoparticles (NP) at top of TiO 2 nanotube (TiO 2 NP@TiO 2 NT) double-layered architecture is constructed to combine the advantages of TiO 2 NP and TiO 2 NT together. This composite TiO 2 NP@TiO 2 NT architecture as photoanode possesses a larger surface area for more QDs loading, and highly tubular structure for electron swift transport. Based on this architecture, CdSe/CdS quantum dots (QDs) have been successfully synthesized by successive ionic layer adsorption reaction (SILAR) method for quantum dots-sensitized solar cell application. The photovoltaic performance of QDSSCs based on TiO 2 NP@TiO 2 NT have been investigated in contrast with bare TiO 2 NP and bare TiO 2 NT architectures with almost the same thickness. The results show that the power conversion efficiency (PCE) of QDSSCs could be enhanced using TiO 2 NP@TiO 2 NT and improved to 3.26%, which is 80% and 38% higher than QDSSCs based on bare TiO 2 NT and bare TiO 2 NP, respectively. The BET surface area, UV–vis absorption spectra, and incident photon to current conversion efficiency (IPCE) measurements results show the evidence that the TiO 2 NP@TiO 2 NT can combine advantages of TiO 2 NP and TiO 2 NT structures together and lead to a higher light harvesting efficiency, electron collecting efficiency, and efficient electron transport.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2022
·Vol. 16
·期 3
·424-430
·
IF 0.687
Wang Jue,Abdoulaye Maman Galandi,Jiang Zhongqin,Xiao Bing,Zhang Jiaming,Liang Yinna,Xiong Jianhua,Chen Guoning,Zhu Hongxiang,Zhao J. R.
With the increasing environmental pollution, it is urgently needed to develop efficient methods to remove recalcitrant organic pollutants. Herein, intimately coupled photocatalysis and biodegradation (ICPB) technology was fabricated using bagasse cellulose-TiO2 composite
(SBC-TiO2) as the carrier for photocatalyst and biofilm, Trichoderma mixed with activated sludge as a novel biological source for the removal of 1,2,3-Trichlorobenzene (1,2,3-TCB) and 1,3,5-Trichlorobenzene (1,3,5-TCB). The effects of different degradation conditions (carrier
dosage, pH of reaction solution, and light intensity) on the degradation efficiency were investigated separately. Under the optimal process conditions (carrier dosage of 5%, pH of the reaction solution was 5, and light intensity was 700 lm/m2), the removal rates of 1,2,3- and 1,3,5-TCB
reached 92.02% and 95.00% within 6 h, respectively. The degradation rate of TCB and the variation of microbial dehydrogenase activity (DHA) showed that the ICPB system exhibited good photocatalytic performance and biodegradation stability.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Juanjuan Yin,Bingcheng Ge,Tifeng Jiao,Zhihui Qin,Meiqi Yu,Lexin Zhang,Qingrui Zhang,Qiuming Peng
Photocatalysts play an increasingly important role in environmental remediation polluted by industrial wastewater. However, the preparation of adsorbents and catalysts with high activity by simple and easy methods is still a great challenge. Here, sandwich-like composite catalyst Cu2O/TiO2/Ti3C2 was prepared by an easily available solvent reduction measure for the highly efficient catalytic nitro compounds. In particular, sandwich-like composite catalyst Cu2O/TiO2/Ti3C2 exhibits excellent catalysis for 2-nitroaniline (2-NA) and 4-nitrophenol (4-NP), and its pseudo-first-order reaction rate constants (k) are 0.163 and 0.114 min–1, respectively. Interestingly, even after eight consecutive cycles of catalytic experiments, the conversion rates of catalytic 2-NA and 4-NP are still greater than 95 and 92%, respectively, demonstrating that the obtained catalyst has excellent catalytic capability and a high reutilization rate. The excellent catalytic performances of Cu2O/TiO2/Ti3C2 can be attributed to the fact that Ti3C2 provides a greater reaction site for the formation of Cu2O and reduces the aggregation during the formation of Cu2O by in situ synthesis. Therefore, ternary composite catalyst Cu2O/TiO2/Ti3C2 prepared by solvent reduction not only supplies a technical method for the catalytic reaction of MXene-based material but also lays the foundation for the development of new photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Chong Liu,Jiandong Fan,Xing Zhang,Yanjiao Shen,Lin Yang,Yaohua Mai
Recently, the organic–inorganic hybrid perovskite solar cells exhibit rapidly rising efficiencies, while anomalous hysteresis in perovskite solar cells remains unsolvable. Herein, a high-quality perovskite thin film is prepared by a modified vapor-assisted solution process, which is a simple but well-controllable method proven to be capable of producing a thin film with full surface coverage and grain size up to micrometers. The as-fabricated perovskite solar cell has efficiency as high as 10.2%. The hysteresis effects of both planar and mesoscopic TiO2-based perovskite solar cells have been comprehensively studied upon illumination. The results demonstrate that mesoporous-based perovskite cells combined with remarkable grain size are subject to alleviating the hysteresis effects in comparison to the planar cells. Likewise, mesoscopic TiO2-based perovskite cells perform independently of illumination and bias conditions prior to the measurements, whereas the planar cells display a reversible behavior of illumination and applied bias-dependent I–V curves. The present study would refer strip road for the stability study of the perovskite solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Wenbo Sun,Peiling Gao,Jiutao An,Jianan Li,Xinyong Li
Hydrogen sulfide (H 2 S), as both an endogenously gaseous signaling compound and an environmentally hazardous substance, has shown great relevance to human health and ecosystem safety. However, a reliable sensing platform for the facile detection of trace H 2 S is still a challenge to be addressed. Herein, a AgI-TiO 2 nanorods array electrode was fabricated through a hydrothermal method followed by ultrasonic impregnation treatment to construct an ultrasensitive photoelectrochemical H 2 S sensor. The decorated AgI could not only play a significant role in the enhancement of visible light absorbance as a narrow bandgap sensitizer but also contribute to the specific affinity towards sulfide as the recognition unit. In the presence of sulfide, multiple heterojunctions were established in situ due to I − -to-S 2− exchange at the AgI sites, proportionately increasing the photocurrent response of the functionalized PEC electrodes. The designed photoelectrochemical (PEC) sensing platform could achieve the quantitative determination of sulfide in a wide range of 1 ∼ 1000 nM with an effective detection limit of 1.25 nM. Additionally, the detection performances for practical H 2 S-containing waste gas and the biological environment were also evaluated. This work could broaden a new vision of the delicate design of interfaces for ultrasensitive environmental analysis.
研究领域:
环境科学
·
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）