Journal of Environmental Sciences
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2024
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IF 5.9
Jianlong Guo,Jingjing Du,Li Yan,Jianbo Shi
Persistently high arsenic levels in drinking water threaten underprivileged areas worldwide. Although nanomaterials exhibit exceptional arsenic removal properties, their implementation presents challenges. We converted N-methylimidazole-modified polyvinyl chloride into a granular anion exchange resin (PNAXRs) using an environmentally friendly and gentle synthesis method. Additionally, a unified approach for embedding nanomaterials within these resins was proposed, yielding a TiO 2 composite resin (TiO 2 @PNAXRs). Structural characterization confirmed the successful grafting of imidazolium cations with anion-exchange properties onto polyvinyl chloride side chains. BET analysis indicates a high specific surface area of 70.31 m 2 /g for the PNAXRs. TGA curves demonstrate the successful encapsulation of approximately 24.9% TiO 2 within the composite resin. The SEM-EDS results show a uniform distribution of TiO 2 in the PNAXRs, which facilitates the effective utilization of TiO 2 . Adsorption experiments in conjunction with XPS analysis provided insights into the dual role of inner-sphere complexation and ion exchange in the adsorption mechanism of As(V) by TiO 2 @PNAXRs. In dynamic adsorption tests utilizing high-As(V) groundwater from the Datong Basin as the influent, TiO 2 @PNAXRs demonstrated the ability to produce effluents that meet the World Health Organization's recommended limit for arsenic in drinking water, with a capacity of 1780 bed volumes. These findings support the use of PNAXRs as ideal matrices for TiO 2 and their practical application in As(V) removal processes.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
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IF 3.9
Jieying Su,Haitao Zhang,Yuanyuan Gong,Qinqin Xu,Maohua Hou,Bin Xu
To develop a material that can be applied in the field of thermoregulation materials for residential buildings and degradation of organic pollutants. A novel microencapsulated phase change material, paraffin@TiO 2 /Ag, was prepared using interfacial condensation technology. The paraffin@TiO 2 /Ag microcapsules' melting point and latent heat were 48.00 °C and 63.56 J/g, respectively, according to the DSC study results, and their encapsulation rate was 46.11 %. In addition, the experimental results of photocatalytic degradation of MB (methylene blue) showed that the paraffin@TiO 2 /Ag microcapsules had high photocatalytic activity for organic dyes under natural light, and the degradation rate of MB reached 99 % when the light exposure time reached 4 h. By comparing the reaction rate constant of MB by paraffin@TiO 2 microcapsules (0.98969 h −1 ) with that of MB by paraffin@TiO 2 /Ag microcapsules (1.15845 h −1 ), it was learned that the introduction of Ag nanoparticles effectively improved the photocatalytic activity of the phase change microcapsules.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Zihan Tian,Shuhao Qin,Jingkui Yang,Xiao Wu,Jing Zhang,Jianxin Li,Hong Wang,Zhenyu Cui
PVDF/TiO 2 @CQDs hybrid photocatalytic thin films were prepared by ink-jet printing. The printing ink was prepared with the TiO 2 , TiO 2 (s)@CQDs (surface composite), and TiO 2 (i)@CQDs (situ doping) nanoparticles as precursors, respectively. Compared to TiO 2 (s)@CQDs, TiO 2 (i)@CQDs has a smaller particle size (about 10.01 nm) and a narrower particle size distribution (6∼14 nm), which can improve the photocatalytic effect while avoiding nozzle clogging. The PVDF/TiO 2 (i)@CQDs hybrid film exhibited a high degradation efficiency ( η ) of 93.71 % for Rhodamine B (RhB) within 150 min under visible light with a catalyst load of only 0.49 wt%. The reaction rate constant ( ks ) of the PVDF/TiO 2 (i)@CQDs film was about 4.3 times higher than that of the PVDF/TiO 2 (s)@CQDs film. The small particle size of this S-scheme TiO 2 (i)@CQDs heterostructure nanoparticle and the more effective contact interface formed between TiO 2 and carbon quantum dots (CQDs) further facilitated electron transfer and enhanced photoactivity. The firmly immobilized catalysts on the Polyvinylidene fluoride (PVDF) film substrate through Ti-F coordination bonds ensured the reusability and stability of the photocatalytic film (the η of RhB still reached 88.05 % after 10 consecutive cycles). This work provides a new strategy for the application of ink-jet printing technology in photocatalysis.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Guoping Yu,Binglin Tang,Qingcheng Luo,Huanyu Chen,Zhe Yin,Zhichao Zhang,Ziwen Wang,Bo Lv,Shaoyun Shan
Powdered titanium dioxide (TiO 2 ) photocatalysts are widely used in the photodecomposition of water for H 2 production due to their low cost, and high stabilizing activity under UV light . However, it has encountered great challenges in photocatalytic reactions, such as easy aggregation and being difficult to recycle. To solve these problems, we proposed a hydrogel (HY) composite material. The material Au@TiO 2 /HY was created by mixing HY with TiO 2 supported co-catalyst Au nanoparticles (NPs). The results show that Au@TiO 2 /HY is difficult to spread owing to its block shape in the photocatalytic reaction, the H 2 evolution rate is only 4.59 mmol/g/h. Therefore, on account of the fact that hydrogel microspheres (HYM) can enhance performance, Au@TiO 2 /HYM was self-assembled by mechanical methods on the synthesis scheme of Au@TiO 2 /HY, which improves the Ultraviolet and visible (UV–vis) light absorption range. The H 2 evolution rate of Au@TiO 2 /HYM is 17.08 mmol/g/h, which is ∼3.7-fold higher than that of Au@TiO 2 /HY (4.59 mmol/g/h), according to the data. The mechanism studies demonstrate that the HYM improve the UV–vis light absorption range and promote the separation of photogenerated electron-hole pairs in Au@TiO 2 /HYM during photocatalysis compared to typical bulk HY, thus improving the photocatalytic H 2 evolution activity. The results provide a reference for the preparation of recyclable HYM for photocatalytic H 2 production.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Ziming Zhao,Wenhao Li,Yong Wang,Jiayu An,Qiuchen He,Su Zhan,Feng Zhou
Anatase TiO 2 (A-TiO 2 ) is regarded as one of the best photocatalysts for hydrogen production technology. However, it presents a formidable challenge for application in seawater splitting process, because of the poisoning effect induced by Cl − oxidation. Herein, a simple strategy of incorporating microcrystalline cellulose (MCC) into the photocatalytic seawater splitting system is proposed to address this issue. The addition of MCC can prevent the Cl − oxidation, inducing the Pt/A-TiO 2 photocatalyst to exhibit a superior stability and a higher H 2 production rate of 113.5 μmol g −1 h −1 . In contrast, without MCC, it only exhibits an H 2 evolution rate of 36.2 μmol g −1 h −1 and experiences an obvious decline to 16.6 μmol g −1 h −1 during the subsequent cycle experiments. These findings demonstrate the feasibility to protect photocatalyst from Cl − oxidation corrosion by applying MCC, which is expected to achieve a stable photocatalytic hydrogen production in seawater.
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ELECTROCHIMICA ACTA
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2024
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IF 5.5
Bao Liu,Guihu Li,Xianbo Cai,Yajun Wang,Yanan Zeng,Qianqian Ren,Junguo Li
The sluggish kinetics of the oxygen evolution reaction (OER) refers to the major contributor to the energy losses in electrowinning of metals. Improving the stability in the long term and activity of the electrocatalyst for OER take on a critical significance in reducing the energy consumption. An efficient and stable OER electrode (named as Ti/SMST/IrO 2 electrode) was prepared in this study by supporting IrO 2 nanoparticles on the surface of the submicrometer-sized TiO 2 (SMST) interlayer. The obtained results indicated that the IrO 2 nanoparticles approximately 14 nm in size were supported onto the submicrometer-sized TiO 2 particles’ surface and exhibited a cactus-like morphology. The Ti/SMST/IrO 2 electrode with the SMST interlayer prepared at 450 °C exhibited the highest electrocatalytic activity in terms of OER for its largest active surface area. This electrode showed an overpotential of 350 mV at a current density of 50 mA cm −2 and displayed a remarkable electrochemical stability of 443 h at a high current density of 2 A cm −2 in H 2 SO 4 solution without significant change in OER activity. The prepared Ti/SMST/IrO 2 electrode with high electrocatalytic performance is considered one of the promising electrodes for OER.
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Nanomaterials
·
2024
·Vol. 14
·期 23
·1930
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IF 4.4
Sha Ni,Wenjing Wu,Zichao Yang,Min Zhang,Jianjun Yang
The Cu cocatalyst supported on the surface of TiO2photocatalysts has demonstrated unique activity and selectivity in photocatalytic CO2reduction. The valence state of copper significantly influences the catalytic process; however, due to the inherent instability of copper’s valence states, the precise role of different valence states in CO2reduction remains inadequately understood. In this study, CuOx/TiO2catalysts were synthesized using an in situ growth reduction method, and we investigated the impact of various valence copper species on CO2photocatalytic reduction. Our results indicate that Cu+and Cu0serve as primary active sites, with the selectivity for CH4and CO products during CO2photoreduction being closely related to their respective ratios on the catalyst surface. The adsorption and activation mechanisms of CO on both Cu+and Cu0surfaces are identified as critical factors determining product selectivity in photocatalytic processes. Furthermore, it is confirmed that Cu+primarily facilitates CH4production while Cu0is responsible for generating CO. This study provides valuable insights into developing highly selective photocatalysts.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Yingying Huang,Sihang Zhang,Shouxiang Jiang,Jiangtao Xu
Flexible surface-enhanced Raman spectroscopy (SERS) substrates have garnered more and more attention due to their noninvasive sample collection ability. However, the improvement of SERS performance gradually reaches a bottleneck with numerous studies on exploration of active materials. In this study, we constructed an Ag@TiO2@cotton SERS substrate with randomly distributed TiO2 nanocavities, which can generate a strong coupling cavity mode, thus dramatically enhancing SERS activities. The prepared SERS substrates demonstrate high detection sensitivity, with a limit of 10–10 M for MB solution, an impressive enhancement factor (EF) of 2.7 × 108, excellent signal reproducibility, and remarkable stability. Furthermore, the proposed material allows the sensitive detection of MG with a limit of 1.0 × 10–10 M through a wiping fish collection method. These flexible Ag@TiO2@cotton substrates expand the range of available SERS substrates, and their easy fabrication method and long-term sensitivity hold promise for the trace analysis of harmful substances.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yijiang Ge,Qinrui Sun,Hongtao Bai,Jingde Li,Xiaohang Du
Degradation of organic pollutants by in-situ electrochemically synthetic hydrogen peroxide (H 2 O 2 ) in electro-Fenton (EF) system is important for the treatment of wastewater. In this work, a Fe, Mo co-doped N@TiO 2 electrocatalyst was constructed for H 2 O 2 generation and applied to the degradation of organic dyes. The FeMoN@TiO 2 catalyst in 0.1 M KOH exhibits excellent 2e - Oxygen reduction reaction (ORR) activity and stability, with a yield of up to 1409 mmol gcat -1 h −1 and Faraday efficiency (FE) of 83.4 % at −0.7 V (relative to SCE) for more than 10 h. The in situ generated H 2 O 2 delivers benign organic dyes degradation ability with high methylene blue (MB) removal rate of 98.2 % after 2 h in 0.1 M KOH without adding Fe 2+ . After adding Fe 2+ , the EF process occurs to degrade dyes more efficiently, with Congo red and phenol removal rates of more than 99.0 % and Ciprofloxacin (CIP) removal rate of more than 96.0 % in 0.1 M Na 2 SO 4 solution. It is found that Mo doping increases the active sites of the catalyst, while the dopant of Fe can enhance can improve the electron transfer rate between the catalyst and reactants. Additionally, the synergistic Fe and Mo modulate the electronic structure of Ti, increasing the concentrations of Ti 3+ and chemiadsorbed O. This enhances the electronic conductivity and the reactivity of the catalyst, leading to improved ability for H 2 O 2 generation and organic pollutants degradation. Radical quenching experiments show that the in-situ generated H 2 O 2 reacts with added Fe 2+ to produce a large amount of ·OH, which is the main active substance for organic pollutants degradation. This study provides new insights for non-precious metal oxides to replace precious metals towards in-situ production of H 2 O 2 and degradation of pollutants.
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CHEMICAL ENGINEERING SCIENCE
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2024
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IF 4.1
Linhan Mao,Yue Lian,Yulin Ma,Congcong Cui,Zhaoxia Chen,Yuhong Zhang
Regular problems faced due to oil spills and soluble contaminants have increasingly caused serious water pollution. Therefore, there is an urgent need to develop efficient strategies to purify wastewater. This study aims to formulate a synergistic treatment technology of sorption and ultraviolet light catalysis for oil–water separation and degradation of dyes in wastewater. In this study, TiO 2 doped PVF sponge (DTMS-TiO 2 @PVF) was prepared with a water contact angle of 151.5° and a removal rate of 98.86 % of MB in 120 min. Meanwhile, DTMS-TiO 2 @PVF sponge could easily realize the selective separation of oil–water mixtures. Its saturated sorption capacity for oil and organic solvent was 4.13–10.05 g/g. In addition, DTMS-TiO 2 @PVF sponge had better environmental stability, which could withstand chemical corrosion (acid, alkaline, and salt solutions). Therefore, DTMS-TiO 2 @PVF sponge showed great potential for application as an efficient oil–water separation and photocatalytic material, especially in the field of treating oil wastewater and water purification.
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Case Studies in Construction Materials
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2025
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IF 6.6
Xin Tang,Weiqiang Luo,Yan Yang,Xuzeng Hu,Xiangyin Li
To enhance the interface bonding performance of cement sheaths in oil and gas wells, this study developed nano TiO 2 -modified waterborne epoxy resin (NTWER) as a cement slurry additive. The mechanical properties and microstructural characteristics of the resulting cement stones were systematically examined. Results indicate that an optimal concentration of nano TiO 2 (NT) in waterborne epoxy resin (WER) improves the stability of the cement slurry. The inclusion of NTWER notably enhanced the shear bonding strength while slightly decreasing uniaxial and triaxial compressive strength and reducing Young’s modulus. When the nano TiO 2 (NT) content in the WER reached 3 %, substantial improvements in shear bonding strength were recorded at both the casing (1st interface) and borehole wall (2nd interface) interfaces after curing for 1, 2, and 7 days, compared to plain cement. Specifically, the shear bonding strength at the 1st interface increased by 23.9 %, 33.5 %, and 31.0 %, while at the 2nd interface, it rose by 25.3 %, 42.5 %, and 37.4 %. Notably, the 2nd interface consistently exhibited higher bonding strength than the 1st. Mechanic studies suggest that NTWER facilitates improved bonding by mitigating early hydration inhibition, reducing macropores, and decreasing overall porosity within the cement matrix. This densification effect and enhanced bonding properties indicate that NTWER effectively addresses the limitations of conventional epoxy resin in oil and gas well cementing applications, offering a promising approach for achieving durable zonal isolation and increased well integrity.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Na Dai,Yingjie Zhang,Zhiwei Peng,Jikai Liu
An efficient CQDs/TiO 2 /Sn-Fe 2 O 3-x heterojunction photoanode was designed and fabricated to enhance the photoelectrochemical (PEC) performance of hematite for water oxidation. The key innovation of this work lies in the construction of an oxygen-vacancy-rich TiO 2 /Sn-Fe 2 O 3-x heterojunction photoanode by using Ti 3 C 2 MXene as the precursor of TiO 2 through a one-pot calcination process. The two main advantages of the present synthetic strategy are introducing abundant oxygen vacancies into the photoanode and preserving the nanostructure of the photoanode at high temperatures. During the synthesis, Ti 3 C 2 MXene was oxidized to form TiO 2 , while Sn-FeOOH was simultaneously converted into Sn-Fe 2 O 3-x nanorods. The high reducibility of Ti 3 C 2 MXene and the doping of Sn 4 + played a critical role in introducing abundant oxygen vacancies into Sn-Fe 2 O 3-x . The concurrent formation of TiO 2 and Sn-Fe 2 O 3-x effectively prevented the aggregation of α-Fe 2 O 3 nanorods at the high calcination temperature of 800°C and promoted close contact between the TiO 2 and Sn-Fe 2 O 3-x , reducing the interfacial transfer resistance. Lastly, the incorporation of CQDs further increased the light absorption ability and PEC performance of the heterojunction photoanode. The CQDs/TiO 2 /Sn-Fe 2 O 3-x photoanode achieved a photocurrent density of 1.47 mA/cm² at 1.23 V vs. RHE, which was 3.34 times higher than the α-Fe 2 O 3 . The enhanced PEC performance can be attributed to the introduction of abundant oxygen vacancies and the maintenance of its nanostructure at high temperatures, which can improve the donor density, charge transfer efficiency and light harvesting ability of the resultant photoanode.
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