WATER RESEARCH
·
2020
·
IF 9.13
Kun Li,Jin Qian,Peifang Wang,Chao Wang,Bianhe Lu,Wen Jin,Xixian He,Sijing Tang,Chao Zhang,Pan Gao
Most of the current studies on the toxicology of pristine nanoparticles (NPs) are environmentally irrelevant, because their ‘‘aging’’ process accompanied by the physicochemical transformation is inevitable in the environment. Considering aging phenomenon will gain a better understanding of the toxicity and fate of NPs in the environment. Here, we focused on the physicochemical transformation of anatase-NPs (TiO 2 -A) and rutile-NPs (TiO 2 -R) after 90 days of aging and investigated the responses of freshwater biofilm formation to the stress changes of naturally aged TiO 2 -NPs (aTiO 2 -NPs). We found that after aging, the TiO 2 -NPs underwent sophisticated physicochemical transformations in the original morphology and microstructure owing to organic and crystal salts inclusions, such as energy band changes and the formation of Ti 3+ on the NPs surfaces. These comprehensive transformations increased the stability of NPs in the exposed suspension. However, the physicochemical transformations were crystal-forms-dependent, and aging did not change the crystal structure and crystallinity . Interestingly, compared to pristine NPs, aTiO 2 -NPs showed much lower cytotoxicity and had the weaker ability to promote or inhibit the biofilm formation (p < 0.05) owing to the passivation of photoactivity caused by the comprehensive effect of the inclusions, especially for aTiO 2 -A. Regardless of aging or not of crystal forms, responses of biofilm formation were exposure-concentration-dependent, namely low concentration promotion (0.1 mg/L) and high concentration inhibition (10 mg/L), e.g., role transition of the pioneers (algae or bacteria) in initial colonization, extracellular polymeric substances (EPS) secretion and compositions of development stages with polysaccharide (PS)-rich and protein (PRO)-rich stages, and biomass and cell activity at different depths of mature biofilms. The reactive oxygen species (ROS) induced by TiO 2 -NPs showed typical hormesis. The changing trends of the autoinducers (c-di-GMP and quorum sensing signals including AHL and AI-2) were highly consistent with the growth stages of biofilms and were stimulated or suppressed by TiO 2 -NPs. The NPs crystal-dependently changed the microorganism community structures, while the UPGMA clustering of bacteria was based on the growth stages of the biofilms. The toxic mechanisms revealed that photoactivity and nanoscale retention of particles are the main reasons for the differences in the ecological stress capacity of four kinds of TiO 2 -NPs. Aging reduced characteristic differences of two pristine NPs and even reversed their relative stresses levels (p > 0.05). However, the toxicity of high-concentration aTiO 2 -NPs (10 mg/L) remained serious in a water environment. This study provides a better understanding for the water environmental risks evaluation and policy control of nanoparticles, that is, the effect of time aging has to be considered.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120487
·
IF 7.2
Jifang Zhang,Chengcheng Suo,Hongru Zhang,Wei Li,Sha Luo,Bing Tian,Chunhui Ma,Shouxin Liu
Constructing an efficient and low-cost electrocatalyst was highly necessary in electrocatalytic lignin depolymerization study. We prepared a unique 1D/2D/1D nanoflower electrocatalyst (Ti 20 @ZIS-Sv@C 0.5 (Ⅱ)) composed of TiO 2 , ZnIn 2 S 4 and C nanosheets by electrostatic self-assembly through solvothermal method. The TiO 2 was located as the core of catalyst and covered by the C deposited ZnIn 2 S 4 nanosheets. The electrochemical impedance (R ct , 248.5 Ω; R L , 6.511 Ω), C dl (1.75817 mF cm −2 ), Tafel efficiency (6.28 mV dec −1 ) and photocurrent intensity (5.23 μA) of Ti 20 @ZIS-Sv@C 0.5 (Ⅱ) exhibited higher electrocatalytic activity than that of original ZnIn 2 S 4 . Under optimized conditions, electrocatalytic process achieved 100 % C α -C β (β-O-4) and C Ar -O (α-O-4) cleavage efficiency and 244.37 mg g −1 benzaldehyde yield. We have further indicated C α -C β (β-O-4) and C Ar -O (α-O-4) cleavage mechanism by Cl-induced radical oxidation pathway. The electrocatalytic depolymerization of G-type lignin could obtained at least 14 molecular products (including 18.21 mg g −1 2-hydroxy-1-phenylethan-one, 11.39 mg g −1 pyrocatechol and 1.25 mg g −1 benzaldehyde). Mechanism investigation suggested the generation of chlorine radical (•Cl), followed by C-H activation and synergistic effect of Ti 20 @ZIS-Sv@C 0.5 (Ⅱ), leading to highly efficient lignin linkages cleavage. This work has developed an efficient electrocatalyst for lignin valorisation to produce aromatics via an electrocatalytic radical pathway.
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高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Xuran Tian,Linyue Tang,Yulan Zeng,Zhonghui Chen,Bin Qiu,Zhenyu Lin,Huixing Chen
This study developed an organic photoelectrochemical transistor (OPECT) biosensor based on TiO2-embedded vertically ordered mesoporous silica film (VMSF) modified ITO electrode for ultrasensitive detection of carcinoembryonic antigen (CEA). The sensor uses VMSF as a molecular gate, with the complementary DNA (cDNA) of the CEA aptamer immobilized at the entrances of the mesoporous channels for specific target recognition. In the absence of CEA, cDNA and the aptamer form stable double-stranded DNA (dsDNA), blocking Ru(phen)32+ from entering the channels and suppressing the photoelectrochemical signal. When CEA is present, it triggers the release of cDNA, which is cleaved by exonuclease I (Exo I), opening the molecular gate and enhancing the photocurrent signal. The Exo I-assisted signal amplification strategy significantly improves the sensor’s sensitivity. Additionally, TiO2 nanoparticles are embedded in the VMSF channels, combining TiO2’s photoelectrochemical properties with VMSF’s molecular sieving function, optimizing charge separation and migration efficiency, and enhancing the photoelectrochemical signal. The energy level alignment between TiO2 and Ru(phen)32+ promotes photoelectric conversion efficiency, while the negative charge on VMSF improves antifouling ability and selectivity. Furthermore, the positively charged Ru(phen)32+ can enters and accumulated in the mesopores of negatively charged VMSF through electrostatic interactions, thereby enhancing the detected signal output under light irradiation. The sensor has a detection range of 100 fg/mL to 500 ng/mL and a minimum detection limit of 0.031 pg/mL, significantly outperforming conventional sensors, demonstrating broad clinical application potential.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Xiao Li,Jiayuan Yu,Guixiang Li,Hui Liu,Aili Wang,Linjing Yang,Weijia Zhou,Benli Chu,Shengwei Liu
Constructing hierarchical structure is an effective approach to improve the activities of catalysts. Herein, a novel hierarchical structure of TiO 2 nanodots anchored on N-doped carbon nanotubes encapsulated Co nanoparticles (TiO 2 /Co@NCT) was synthesized by a simple pyrolysis method. Their catalytic performances were examined in the oxidative and light-assisted degradation of recalcitrant pollutants in the presence of the peroxymonosulfate (PMS). The Orange II removal efficiency within 15 min reached about 98.48% in TiO 2 /Co@NCT/PMS system. In this system, Co 0 is used to react with PMS to generate free radicals for the degradation of dyes. The carbon shell benefits the adsorption of dyes and prevents the catalysts from dissolving in the solution. Besides, under light irradiation, TiO 2 nanodots can be excited to generate photo-induced electrons, which can reduce inner Co 2+ to Co 0 in the degradation process, thus TiO 2 /Co@NCT exhabited high activity and outstanding stability in degradation process. The as-prepared TiO 2 /Co@NCT catalyst showed efficient degradation and superior stability, which would make it a great promise in practical applications for sewage treatment.
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高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Tao Lv,Haifan Wang,Wei Hong,Peng Wang,Lishan Jia
In the present work, an indirect Z-schematic heterojunction system of TiO 2 and LaFeO 3 (LFO) with a solid state electron mediator (RGO) is proposed and applied for photocatalytic hydrogen (H 2 ) evolution. Through a facile 2-step synthesis strategy including adsorption of LFO on GO sheets and growth of TiO 2 between the LFO-GO frameworks, a Ti-O-C bonds strongly linked sandwich-like TiO 2 /RGO/LFO composite is obtained. The structure, morphology, optical properties and catalytic mechanism of the Z-scheme heterojunction are thoroughly investigated. The obtained visible light responded TiO 2 /RGO/LFO composite displays significantly elevated photocatalytic performance for H 2 evolution with excellent stability, and its H 2 production rate (0.893 mmol h −1 g -1 ) is approximately 3.2, 14.4 and 11.4 times superior to the direct Z-scheme TiO 2 /LFO composite, pure TiO 2 and LFO, respectively. The sandwich-like structure with strong interaction between three components and short diffusion distance for impactful separation of e--h + pairs bring about a vast improvement in H 2 evolution performance of TiO 2 /RGO/LFO composite. In addition, Ti-O-C bonds could also enhance electronic conductivity and structure stability as a bridge of photogenerated carriers. Based on the investigation results, possible mechanisms for synthesis and photocatalytic charge transfer pattern for TiO 2 /RGO/LFO are developed.
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NANOTECHNOLOGY
·
2016
·Vol. 27
·期 14
·145701
·
IF 3.573
Yong Zuo,Ji-Ming Song,He-Lin Niu,Chang-Jie Mao,Sheng-Yi Zhang,Yu-Hua Shen
P-nitrophenol (4-NP) and hydrazine hydrate are considered to be highly toxic pollutants in wastewater, and it is of great importance to remove them. Herein, TiO2-loaded Co0.85Se thin films with heterostructure were successfully synthesized by a hydrothermal route. The as-synthesized samples were characterized by x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy and selective-area electron diffraction. The results demonstrate that TiO2 nanoparticles with a size of about 10 nm are easily loaded on the surface of graphene-like Co0.85Se nanofilms, and the NH3 · H2O plays an important role in the generation and crystallization of TiO2 nanoparticles. Brunauer–Emmett–Teller measurement shows that the obtained nanocomposites have a larger specific surface area (199.3 m2 g−1) than that of Co0.85Se nanofilms (55.17 m2 g−1) and TiO2 nanoparticles (19.49 m2 g−1). The catalytic tests indicate Co0.85Se–TiO2 nanofilms have the highest activity for 4-NP reduction and hydrazine hydrate decomposition within 10 min and 8 min, respectively, compared with the corresponding precursor Co0.85Se nanofilms and TiO2 nanoparticles. The enhanced catalytic performance can be attributed to the larger specific surface area and higher rate of interfacial charge transfer in the heterojunction than that of the single components. In addition, recycling tests show that the as-synthesized sample presents stable conversion efficiency for 4-NP reduction.
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 39
·20666-20676
·
IF 11.301
Die Su,Li Liu,Zhixiao Liu,Jing Dai,Jiaxing Wen,Min Yang,Sidra Jamil,Huiqiu Deng,Guozhong Cao,Xianyou Wang
Ta-doped TiO2/C nanofibers are synthesized by an electrospinning method. First-principles calculations reveal that the Ta dopant can lower the Li/K diffusion barrier, which is beneficial for improving the rate capability. According to the electronic structure analysis, the dopant can obviously shift the conduction band of TiO2 downward, resulting in significantly improved electronic conductivity. Ta doping causes phase transformation from anatase to rutile, and increases the specific surface area. The well-designed rutile Ta-doped TiO2/C nanofibers show outstanding electrochemical properties in both Li-metal half cells and K-metal half cells, which are much better than those of pristine anatase TiO2/C nanofibers. At 2 A g−1, 5% rutile Ta-doped TiO2/C nanofibers could deliver high reversible specific capacities of 399 mA h g−1 in Li-ion batteries after 1000 cycles whereas deliver 148 mA h g−1 in K-ion batteries after 800 cycles. When assembled, the full cells with 5% rutile Ta-doped TiO2/C nanofibers as the anode and commercial LiFePO4/perylene-3,4,9,10-tetracarboxylic dianhydride as the cathode show excellent cycling performance and can light up more than 18 LEDs. These results demonstrate that Ta-doped TiO2/C nanofibers are a promising anode material for Li/K ion batteries.
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Small
·
2023
·Vol. 19
·期 38
·2302831
·
IF 13.3
Tianhao Yao,Hongkang Wang,Xin Ji,Deyu Wang,Qingmiao Zhang,Lingjie Meng,Jian-Wen Shi,Xiaogang Han,Yonghong Cheng
Titanium dioxide (TiO 2 ) is a promising anode material for sodium–ion batteries (SIBs), which suffer from the intrinsic sluggish ion transferability and poor conductivity. To overcome these drawbacks, a facile strategy is developed to synergistically engineer the lattice defects (i.e., heteroatom doping and oxygen vacancy generation) and the fine microstructure (i.e., carbon hybridization and porous structure) of TiO 2 -based anode, which efficiently enhances the sodium storage performance. Herein, it is successfully realized that the Si-doping into the MIL-125 metal-organic framework structure, which can be easily converted to SiO 2 /TiO 2–x @C nanotablets by annealing under inert atmosphere. After NaOH etching SiO 2 /TiO 2–x @C which contains unbonded SiO 2 and chemically bonded Si O Ti, thus the lattice Si-doped TiO 2–x @C (Si-TiO 2–x @C) nanotablets with rich Ti 3+ /oxygen vacancies and abundant inner pores are developed. When examined as an anode for SIB, the Si-TiO 2–x @C exhibits a high sodium storage capacity (285 mAh g −1 at 0.2 A g −1 ), excellent long-term cycling, and high-rate performances (190 mAh g −1 at 2 A g −1 after 2500 cycles with 95.1% capacity retention). Theoretical calculations indicate that the rich Ti 3+ /oxygen vacancies and Si-doping synergistically contribute to a narrowed bandgap and lower sodiation barrier, which thus lead to fast electron/ion transfer coefficients and the predominant pseudocapacitive sodium storage behavior.
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高影响因子
FUEL
·
2020
·
IF 5.578
Hau Quoc Pham,Tai Thien Huynh,Son Truong Nguyen,Nam Nguyen Dang,Long Giang Bach,Van Thi Thanh Ho
Direct alcohol fuel cells (DAFCs) use liquid and renewable fuels that have been sparked significant interest in a variety of applications; however, the poor catalytic performance of the state-of-the-art Pt nanoparticles (NPs) over carbon support is a major challenge for further DAFC utilization. Herein, the 1D-bimetallic Pt 3 Co nanowires with a diameter of ~4 nm and the lengths of up to several tens nanometers were grown firstly on the non-carbon Ti 0.7 W 0.3 O 2 nanoparticles via a template- and surfactant-free chemical reduction preparation at room temperature. Electrochemical results indicated that the bimetallic Pt 3 Co NWs/Ti 0.7 W 0.3 O 2 catalyst was an effective electrocatalyst toward alcohol (methanol, ethanol) electrochemical oxidation. For instance, the bimetallic Pt 3 Co NWs/Ti 0.7 W 0.3 O 2 catalyst exhibited high mass activity (MOR of ~393.29 mA m g P t - 1 and EOR of ~341.76 mA m g P t - 1 ), low onset potential (~0.01 V vs. NHE for MOR and ~0.20 V vs. NHE for EOR) and superior CO-tolerance (I f /I b value for MOR of ~3.11 and EOR of ~1.54) in comparison with the conventional carbon-supported Pt nanoparticles (NPs) catalyst. Additionally, the mass activity loss of the Ti 0.7 W 0.3 O 2 -supported Pt 3 Co (NWs) catalyst was ~10.68% of the initial mass activity, which ~4.18-time lower than that of the carbon-supported Pt (NPs) catalyst (~44.66% of the initial mass activity) after 5000 cycles test, indicating the superior stability retention of the as-obtained Pt 3 Co NWs/Ti 0.7 W 0.3 O 2 electrocatalyst . These enhancements were attributable to the combination of the advantageous 1D nanostructures with the internal effect of the Pt 3 Co nanowires, the synergistic effect between Pt-M alloy and TiO 2 -based nanomaterials and the superior anti-corrosion possibility of the non-carbon support.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Huijun Yu,Zongwei Tong,Baojie Zhang,Zhiwei Chen,Xiaolei Li,Dong Su,Huiming Ji
Fiber/aerogel composites attract considerable interest as thermal insulation materials due to their low thermal conductivity . However, in practice they deliver unsatisfactory performance due to their high infrared radiation transmittance and poor interfacial adhesion. Herein, we report a simple strategy for constructing vertically aligned 1D rutile TiO 2 nanorod arrays (TiO 2 -NRAs) directly on the surface of quartz fibers (QFs) by in-situ growth. A novel ‘fiber/nanorod/aerogel’ composite was synthesized by filling the pores of QF/TiO 2 -NRAs with SiO 2 -Al 2 O 3 aerogels (ASAs) through vacuum impregnation. The QF/TiO 2 -NRAs/ASA composite exhibited excellent thermal insulation (0.071 W·m −1 ·K −1 at 1100 °C), infrared radiation shielding performance (an extinction coefficient greater than 150 cm −1 and an infrared reflectivity greater than 95%), fire resistance (more than 1200 °C), and compressive strength (0.37 MPa, 10% strain). In-situ growth of TiO 2 -NRAs can reduce the gaseous thermal conductivity by increasing the interfacial adhesion force between fibers and aerogels, and reduce the radiation heat transfer by shielding infrared radiation. This strategy is applicable to multi-type fibers reinforced silica-based aerogel materials used for insulation and protection in extreme environments.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Pin Chen,Siyuan Di,Xiaoqing Qiu,Shukui Zhu
In order to achieve excellent visible light photoactivity of TiO 2 , it is still urgently required to extend their optical absorption ability and improve the potential of charge separation and migration. Here we synthesized highly efficient visible-light-active catalysts F-TiO 2 /g-C 3 N 4 via a one-step-calcination method. Due to the synergic effect of ≡Ti−F, ≡Ti:F−H and the heterojunction, the obtained catalysts possess promising properties as highly efficient separation and migration of photoelectron-hole pairs. The prepared F-TiO 2 /g-C 3 N 4 heterojunction can be successfully applied to degrade the widely used flame retardants and antibiotics. More than 95% of tetrabromobisphenol A (TBBPA) was decomposed after light illumination for 120 min, and 98% of sulfamethazine (SMZ) was degraded for 60 min by F-TiO 2 /g-C 3 N 4 . Furthermore, a reasonable catalytic mechanism for the F-TiO 2 /g-C 3 N 4 catalysts was proposed. It could be seen that the active species •O 2 − , •OH, and h + played important roles in the photocatalytic process under visible light illumination.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Zhiqiao He,Lixian Jiang,Da Wang,Jianping Qiu,Jianmeng Chen,Shuang Song
A series of fluorinated anatase TiO2 nanosheets with dominant {001} facets were synthesized to oxidize p-chlorophenol (PCP) and reduce Cr(VI) simultaneously under visible light. The {001}/{101} surface facets ratio of TiO2 was controlled by varying the initial HF concentration, and fluorine-free samples were obtained by alkaline-washing. A synergistic effect among TiO2, Cr(VI), and PCP was observed, which is ascribed to effective trapping of photogenerated electrons and holes by Cr(VI) and PCP, respectively. A maximum synergistic effect was obtained at a molar ratio of [PCP] to [Cr(VI)] of one. Using X-ray diffraction, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, and Brunauer–Emmett–Teller analyses, the optimum ratio of exposed {001} to {101} facets for TiO2 was determined to be 80:20 because of selective transfer and charge balance of photogenerated carriers. Surface fluorination facilitates the formation of oxygen vacancies and unsaturated Ti atoms, which is useful for visible light activity induction, extending the lifetime of photogenerated electron-hole pairs, and enhancing the rate of PCP oxidation and Cr(VI) reduction.
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高影响因子
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