THERMOCHIMICA ACTA
·
2018
·
IF 2.189
Xian-Wei Cheng,Jin-Ping Guan,Xu-Hong Yang,Ren-Cheng Tang
A novel and durable organic-inorganic flame retardant (FR) system for wool fabric was fabricated using natural phytic acid (PA), titanium dioxide (TiO 2 ) nanoparticles and 1,2,3,4-butanetetracarboxylic acid (BTCA). In order to address the diffusion barrier action of wool fiber to the FR agents, an additional exhaustion process was employed ahead of the traditional pad-dry-cure procedure. The flame retardancy, smoke generation, thermal stability, and washing durability of the treated fabrics were discussed. The PA/TiO 2 /BTCA system endowed wool fabric with excellent flame retardancy and washing durability. The treated fabric was still able to self-extinguish after 30 washing cycles. Moreover, the FR system effectively reduced the smoke generation capacity. Thermogravimetry test shows that the FR system altered the thermal decomposition behavior of wool, and the formation of thermal protective intumescent char mainly contributed to the improved flame retardancy, revealing a significant condensed-phase FR mechanism of the treated wool.
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Caifeng Zhao,Yahui Yang,Lin Luo,Sai Shao,Yiji Zhou,Ying Shao,Faqi Zhan,Jian Yang,Yaoyu Zhou
Oxygen vacancies and Ti 3+ defects in anatase TiO 2 have attracted great attention to address the insufficient optical absorption and photoinduced charge-carrier separation in photocatalysis . In this study, we demonstrate a superficial and innovative approach for synthesizing anatase TiO 2 nanoparticles with abundant oxygen vacancies via γ-ray irradiation reduction at room temperature. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) confirm that oxygen vacancies and Ti 3+ defects can be quantitatively and extensively obtained by merely regulating the irradiation dosage. Photoelectrochemical measurements suggest that oxygen vacancies and Ti 3+ defects promoted the separation of electron-hole pairs and then enhanced the photocatalytic degradation performance for organic pollutant. In comparison with TiO 2 (no irradiation), the sample (49.5 kGy irradiation) exhibited a 20.0-fold enhancement in visible-light decomposition of phenol. In addition, the results of scavenge experiments and mechanism analysis revealed that O 2 − are the dominant active species. The excited electrons generated at the conduction band and oxygen vacancy level of TiO 2−x -49.5 conspicuously contributes to generate much more ·O 2 − species. This novel study shows at room temperature, the γ-ray approach of irradiation leads to faster formation and quantification of oxygen vacancies in the semiconductor materials .
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Qi Jiang,Runliang Zhu
Heterogeneous Fenton reaction is a usable technique to remove organic contaminants in water, while developing highly efficient and cost-effective catalysts with simple preparation method is critical for its practical application. In this work, novel TiO 2 /Mag composites were prepared from commercial TiO 2 and natural magnetite (Mag) via a facile ball milling process. We expect the obtained composites to be efficient photo-Fenton catalysts, as photo-generated electrons from TiO 2 can be transferred to Mag to accelerate the reduction of Fe(III) to Fe(II), promoting the decomposition of H 2 O 2 and production of ·OH. Structural characterization results exhibited ball milling could not change mineral phases of both TiO 2 and Mag. TiO 2 /Mag composites remained good magnetic saturation and could be rapidly separated from reaction medium. In degrading cefotaxime, TiO 2 /Mag composites showed high photo-Fenton catalytic activities, with the degradation rate by 10%TiO 2 /Mag at near neutral pH of 5.6 being about 11.6 and 8.2 times higher than that of natural and ball-milled Mag, respectively. Moreover, even at low H 2 O 2 concentration of 1 mmol/L, 10%TiO 2 /Mag remained relatively high photo-Fenton catalytic activity when compared to natural and ball-milled Mag. The better production of ·OH in the photo-Fenton system catalyzed by 10%TiO 2 /Mag (0.244 mmol/L) than that by natural and ball-milled Mag (0.049 and 0.064 mmol/L) also illustrated efficient utilization of H 2 O 2 by 10%TiO 2 /Mag. Above results well support our hypothesis that photo-generated electrons from TiO 2 were transferred to Mag, which then benefited the Fenton reactivity of Mag and degradation of cefotaxime. In all, TiO 2 /Mag composites prepared by ball milling have promising practical application in water treatment, thanks to their merits such as high photo-Fenton catalytic activity, facile preparation, cost-effective, easy magnetic separation, good stability, suitable for near neutral pH, and efficient utilization of H 2 O 2 .
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 7
·4102-4107
·
IF 3.108
Jialing Li,Yi Jiang,Qian Zhang,Xiaochen Zhao,Na Li,Haili Tong,Xiaoxuan Yang,Lixin Xia
A simple and effective method to prepare photocatalytically active electrodes for water oxidation is described in this paper. The precious-metal-free catalyst, Co4O4(O2CMe)4(4-vinylpy)4 (py = pyridine) was electrochemically polymerised on a RuP-sensitised TiO2 (RuP = [Ru(bpy)2(4,4′-(PO3H2)2bpy2)]Cl2) and on a TiO2 surface codecorated with vinyl phosphate (Vpa) and RuP for applications in molecular photoelectrochemical (PEC) devices. With a Vpa chain as the anchoring group, the photoanode poly-Co4O4+Vpa/RuP/TiO2 demonstrated a significantly higher PEC performance compared to poly-Co4O4/RuP/TiO2. The introduction of a Vpa chain allows better immobilisation of catalyst and enhances the electron transport between the photosensitiser and the catalyst. A photocurrent density of ∼100 μA cm−2 was achieved in a Na2SO4 solution at pH 7.0 under a 0.4 V external bias, with a faradaic efficiency of 76% for oxygen production.
✓ 已验证
DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2019
·Vol. 11
·期 9
·1263-1270
·
IF 0
Li Zhanguo,Shi Chao,Wang Lijuan,Sun Lijing,Sun Qiang
Photocatalytic nanocomposites of titanium dioxide (TiO2) were prepared by hydrothermal method. Reduced graphene oxide (RGO) was applied to prepare various TiO2 composites of doped nanoparticles by using NH4Cl and FeCl3 as sources. The structure
and morphology of these composites showed that TiO2 was loaded on surface of RGO. Meanwhile, the agglomeration of TiO2 decreased and the dispersion became uniform for doped materials. Under ultraviolet (UV) light irradiation, the photocatalytic degradation of volatile
organic compounds (VOC) by RGO/TiO2 composites with codoping of N and Fe reached to 90.5%. The photocatalytic degradation was higher than RGO/TiO2 composites and pure TiO2 by 1.8 and 5.9 times, respectively. The role of co-doping composites may have a possible
mechanism for toluene under UV light irradiation. The enhanced photocatalytic properties were attributed to N and Fe doping which generated intermediate energy level, extended absorption and decreased band gap of UV light.
✓ 已验证
DOI
Nanomaterials
·
2019
·Vol. 10
·期 1
·1
·
IF 4.034
Rui Geng,Juanjuan Yin,Jingxin Zhou,Tifeng Jiao,Yao Feng,Lexin Zhang,Yan Chen,Zhenhua Bai,Qiuming Peng
The construction of heterojunctions provides a promising strategy to improve photocatalytic hydrogen evolution. However, how to fabricate a nanoscale TiO2/g-C3N4heterostructure and hinder the aggregation of bulk g-C3N4using simple methods remains a challenge. In this work, we use a simple in situ construction method to design a heterojunction model based on molecular self-assembly, which uses a small molecule matrix for self-integration, including coordination donors (AgNO3), inorganic titanium source (Ti(SO4)2) and g-C3N4precursor (melamine). The self-assembled porous g-C3N4nanotube can hamper carrier aggregation and it provides numerous catalytic active sites, mainly via the coordination of Ag+ions. Meanwhile, the TiO2NPs are easily mineralized on the nanotube template in dispersive distribution to form a heterostructure via an N–Ti bond of protonation, which contributes to shortening the interfacial carrier transport, resulting in enhanced electron-hole pairs separation. Originating from all of the above synergistic effects, the obtained Ag/TiO2/g-C3N4heterogenous photocatalysts exhibit an enhanced H2evolution rate with excellent sustainability 20.6-fold-over pure g-C3N4. Our report provides a feasible and simple strategy to fabricate a nanoscale heterojunction incorporating g-C3N4, and has great potential in environmental protection and water splitting.Keywords:heterojunction;Ag/TiO2/g-C3N4;Co-assembly;hydrogen evolution
✓ 已验证
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 13
·2102464
·
IF 6.389
Weihuang Wang,Liquan Yao,Jiabin Dong,Li Wu,Zixiu Cao,Li Hui,Guilin Chen,Jingshan Luo,Yi Zhang
An undesirable p–n heterojunction interface of Sb 2 Se 3 absorber with Cd-free electron transport layer (ETL) is one of the key problems hindering the efficiency improvement of Sb 2 Se 3 solar cell. Herein, a promising SnO 2 /TiO 2 ETL coupled with SbCl 3 treatment is introduced to improve the performance of Sb 2 Se 3 solar cell. The mechanism of SbCl 3 treatment on the crystal orientation of Sb 2 Se 3 thin film and the p–n heterojunction interface of Sb 2 Se 3 solar cell is disclosed combined with different characterization methods. The carrier transport property for Sb 2 Se 3 thin film is enhanced, and the conduction band offset (CBO) of TiO 2 /Sb 2 Se 3 interface is reduced from 0.57 to 0.20 eV by forming Sb 2 O 3 interlayer at TiO 2 /Sb 2 Se 3 interface after SbCl 3 treatment, by which the interface recombination and the open circuit voltage deficit of the device can be effectively decreased, and the interface bonding at TiO 2 /Sb 2 Se 3 interface can be effectively improved. Ultimately, the Cd-free Sb 2 Se 3 solar cell with configuration of ITO/SnO 2 /TiO 2 /Sb 2 Se 3 /Au achieves an efficiency of 5.82%, which is the highest efficiency in vapor transport deposition (VTD)-processed Cd-free Sb 2 Se 3 solar cell at present. This work is expected to fill in the blank of VTD-processed Cd-free Sb 2 Se 3 solar cell and offers a valuable reference for future band alignment of Sb 2 Se 3 solar cell.
✓ 已验证
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 5
·456
·
IF 2.654
Lihui Xuan,Guangping Han,Dong Wang,Wanli Cheng,Xun Gao,Feng Chen,Qingde Li
Surface modification and characterization of titanium dioxide (TiO2) nanoparticles and their roles in thermal, mechanical, and accelerated aging behavior of foamed wheat straw fiber/polypropylene (PP) composites are investigated. To improve the dispersion of nanoparticles and increase the possible interactions between wheat straw fiber and the PP matrix, the surface of the TiO2nanoparticles was modified with ethenyltrimethoxy silane (A171), a silane coupling agent. The grafting of A171 on the TiO2nanoparticles’ surface was characterized by Fourier transform infrared spectroscopy (FTIR). The wheat straw fibers treated with A171 and modified TiO2nanoparticles were characterized by FTIR and thermogravimetric analysis (TGA). FTIR spectra confirmed that the organic functional groups of A171 were successfully grafted onto the TiO2nanoparticles and wheat straw fibers, and the modified TiO2nanoparticles were adsorbed onto the wheat straw fibers. Thermogravimetric analysis showed that a higher thermal stability of the wheat straw fiber was obtained with the modified TiO2nanoparticles. The flexural, tensile, and impact properties were improved. A higher ultraviolet (UV) stability of the samples treated with modified TiO2nanoparticles was exhibited by the study of the color change and loss in mechanical properties.Keywords:surface-modified TiO2nanoparticles;foamed wheat straw fiber/polypropylene composites;mechanical properties;thermostability;UV stability
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Qianqian Huang,Yun Hu,Yun Pei,Jinhui Zhang,Mingli Fu
TiO 2 @NH 2 -MIL-125, composite photocatalysts with close interfacial contact between NH 2 -MIL-125 and TiO 2 , were successfully synthesized via an in-situ solvothermal method for formaldehyde (HCHO) removal under UV irradiation. Samples were characterized by using a variety of analytical techniques. The results showed that TiO 2 particles were highly dispersed on the surface of NH 2 -MIL-125, and there was a strong electronic interaction (Ti-N-C) between elements of the composite. TiO 2 @NH 2 -MIL-125 exhibited significantly enhanced photocatalytic performance for HCHO removal compared to pure TiO 2 and NH 2 -MIL-125 that was ascribed to the synergistic combination of high adsorption capacity of NH 2 -MIL-125, high dispersion of TiO 2 and efficient interfacial charge transfer between TiO 2 and NH 2 -MIL-125. Furthermore, the HCHO removal rate over the composite remained at 90% after 122 h of continuous photocatalytic reaction, indicating the high stability of the catalyst. This work provides new insights that will be helpful in the further development of photocatalysts for indoor air purification.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Deli Jiang,Yimeng Zhou,Qianxiao Zhang,Qi Song,Changjian Zhou,Xiangli Shi,Di Li
Photocatalytic reduction of CO2 toward eight-electron CH4 product with simultaneously high conversion efficiency and selectivity remains great challenging owing to the sluggish charge separation and transfer kinetics and lack of active sites for the adsorption and activation of reactants. Herein, a defective TiO2 nanosheet photocatalyst simultaneously equipped with AuCu alloy co-catalyst and oxygen vacancies (AuCu-TiO2–x NSs) was rationally designed and fabricated for the selective conversion of CO2 into CH4. The experimental results demonstrated that the AuCu alloy co-catalyst not only effectively promotes the separation of photogenerated electron–hole pairs but also acts as synergistic active sites for the reduction of CO2. The oxygen vacancies in TiO2 contribute to the separation of charge carriers and, more importantly, promote the oxidation of H2O, thus providing rich protons to promote the deep reduction of CO2 to CH4. Consequently, the optimal AuCu-TiO2–x nanosheets (NSs) photocatalyst achieves a CO2 reduction selectivity toward CH4 up to 90.55%, significantly higher than those of TiO2–x NSs (31.82%), Au-TiO2–x NSs (38.74%), and Cu-TiO2–x NSs (66.11%). Furthermore, the CH4 evolution rate over the AuCu-TiO2–x NSs reaches 22.47 μmol·g–1·h–1, which is nearly twice that of AuCu-TiO2 NSs (12.10 μmol·g–1·h–1). This research presents a unique insight into the design and synthesis of photocatalyst with oxygen vacancies and alloy metals as the co-catalyst for the highly selective deep reduction of CO2.
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Yaping Zhang,Guobo Li,Peng Wu,Hongqiang Yang,Sheng Wang,Kai Shen,Ling Wang
TiO 2 -Vo support with abundant oxygen vacancy was prepared by hydrothermal method, purchased TiO 2 -P for comparison, and Pd 0.12 V 4 /TiO 2 catalysts with different TiO 2 structures were prepared to investigate catalytic oxidation for dichloromethane (DCM). Pd 0.12 V 4 /TiO 2 -Vo catalyst showed excellent low temperature DCM removal efficiency, T 90 of which reduced to 290 ℃, and Cl resistance was maintained in 40 h. Abundant oxygen vacancy of TiO 2 -Vo was formed in transformation process of part anatase TiO 2 to rutile phase. The obtained Pd 0.12 V 4 /TiO 2 -Vo catalyst possessed rich acid sites, higher adsorbed oxygen (O ads ) ratio and better oxygen mobility, which inhibited loss of active components and improved DCM removal efficiency. DCM removal efficiency of Pd 0.12 V 4 /TiO 2 catalyst was reduced by HCl, while negative effect in the way of weakening competitive adsorption between HCl and DCM, that would be reduced by TiO 2 supports modification. The present work is favorable for further DCM removal catalyst anti-Cl poisoning modification and application in manufacture industry.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lianying Lu,Guohong Wang,Min Zou,Juan Wang,Jun Li
Hierarchical TiO 2 /g-C 3 N 4 heterojunction photocatalysts with well-defined multiscale porous TiO 2 framework are synthesized by simply calcinating tetrabutyl titanate and melamine precursors. The samples have been characterized by XRD, XPS, SEM, TEM, FTIR, nitrogen absorption-desorption equipment and TGA. The photocatalytic activity of these samples has been investigated in photo-degradation of Rhodamine B (RhB). The results show that calcining temperature critically affects the microstructure, surface area, interface structure and catalytic properties of the prepared samples. At the optimal calcining temperature of 550 °C, the apparent reaction rate constant of the catalyst is 55.0 × 10 −3 min −1 , which is 16.2 fold of pure TiO 2 (3.4 × 10 −3 min −1 ) and 3.4 fold of pure g-C 3 N 4 (16.4 × 10 −3 min −1 ), respectively. The strengthened visible-light-driven photocatalytic activity is attributed to the formation of a unique Z-scheme TiO 2 /g-C 3 N 4 heterojunction due to C- or N-doping at the surface of the porous TiO 2 framework. This mechanism explains the observation in a series of radical trapping experiments that superoxide ions and photo-generated holes play major roles in the photo-decolorizing process while hydroxyl radicals are also involved with a minor role.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）