SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Weishan Qin,Ting Su,Guodong Chai,Xinhong Wang,Weichao Qin,Hongbin Yu
Photoelectrocatalysis is a promising method for removing biorefractory organic pollutants. However, the inefficient utilization of light and electricity by photoanodes and the failure to effectively execute cathode functions typically lead to poor degradation performance. Therefore, in this study, a photoelectrocatalytic (PEC) system coupled with electro-activated persulfate (E-PS) was constructed using a 3D nanostructured PbO 2 /Sb-SnO 2 //blue-TiO 2 //WO 3 bifacial anode and a Mo-CuFeO 2 -modified carbon felt cathode. The results indicate that the bifacial anode could effectively implement electro-assisted photocatalysis on the irradiating side and electrocatalysis on the back side. This significantly accelerated acetaminophen degradation with a synergy index of 48.98 %. Additionally, the PEC/E-PS system was established by combining a bifacial anode with a persulfate-activated cathode, which promoted the efficient utilization of photogenerated electrons and increased the number of active species in the coupled system. Density functional theory calculations confirmed that Mo tended to dope the Fe sites and promote the adsorption of PS on Mo-CuFeO 2 , facilitating the continuous activation of persulfate. In the coupled system, the contribution order of different active species to acetaminophen degradation was h + > OH > SO 4 − > 1 O 2 > O 2 − . Their mutual conversion enabled the PEC/E-PS system to efficiently remove acetaminophen with a relatively high current efficiency (22.69 %) and low energy consumption (0.06 kWh⋅gCOD −1 ). The proposed PEC/E-PS system is an efficient and sustainable method for treating organic contaminants in wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Zijun Xu,Ruoxin Ma,Chun Zhang,Jiao Chen,Jingbiao Fan,Qingdong Shi
Cr(VI) pollution in water caused by industrialization poses a serious threat to human health and ecosystems, necessitating a rapid reduction of Cr(VI) treatment method. Therefore, We have established a photocatalytic method for the rapid reduction of Cr(VI) by modifying TiO 2 with carbon dots (CPC-CDs) that possess a quaternary ammonium structure in the first time. The CPC-CDs widens the band gap of TiO 2 and increases the electrostatic interactions between CPC-CDs/TiO 2 and Cr(VI), thus improving the reduction efficiency. CPC-CDs/TiO 2 (0.1 g, 2 % CPC-CDs) exhibited excellent reduction performance and fully reduced Cr(VI) (50 mg/L) under neutral conditions within 150 min using a xenon lamp to simulate sunlight. Moreover, CPC-CDs/TiO 2 achieved more than 95 % reduction efficiency over a wide pH range (pH = 3, 5, 7, and 9) and showed excellent reduction of Cr(VI) at various concentrations (10, 20, 30, 40 and 50 mg/L). CPC-CDs/TiO 2 maintained high Cr(VI) reduction efficiency (93.57 %) after five cycles. Tests under real sunlight revealed that CPC-CDs/TiO 2 thoroughly reduced Cr(VI) (10 mg/L) within 30 min, and exhibited excellent structural stability under conditions with interfering ions. Furthermore, CPC-CDs/TiO 2 exhibited prominent antibacterial activity against Escherichia coli . In addition, free-radical trapping experiments verified that the superoxide radicals (• O 2 - ) was the main active species. This study aims to overcome the limitations of photocatalytic reduction under conditions of high concentration Cr(VI), neutral and alkaline environments, and natural sunlight, thereby providing technical support for the rapid reduction of Cr(VI).
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ELECTROCHIMICA ACTA
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2011
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IF 3.65
Yiping Liu,Shirong Wang,Zhongqiang Shan,Xianggao Li,Jianhua Tian,Yeming Mei,Huanmei Ma,Kunlei Zhu
The anatase TiO 2 hollow spheres with a diameter of approximately 250 nm were synthesized by a chemical template method. Compared to conventional P25 nanocrystalline particles, the TiO 2 hollow structured materials not only have a low density, high specific surface areas, and hierarchically porous structures but also exhibit high light-scattering efficiency and fast motion of the charge carriers. A photoelectrode consisting of TiO 2 hollow spheres for use in dye-sensitized solar cells (DSSCs) is prepared, and the nanostructure and the performance of DSSCs with an ionic liquid electrolyte are investigated. Improved performance of the DSSCs (Jsc = 8.0 mA cm −2 , Voc = 0.732 V, FF = 65%, and η = 3.79%) is obtained compared with the P25 TiO 2 nanocrystalline DSSCs (Jsc = 7.25 mA cm −2 , Voc = 0.702 V, FF = 59%, η = 2.96%, and measured at 100 mW cm −2 , AM 1.5 G). The improved performance is primarily due to the enhanced light scattering by the TiO 2 hollow spheres and the highly porous structure of the hollow sphere electrode, allowing the highly viscous non-volatile electrolytes to thoroughly penetrate the electrode. The results show that the structure of the TiO 2 hollow sphere photoelectrode can greatly improve the performance of the DSSCs with non-volatile electrolytes.
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APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Xiaoyan Ma,Huiting Wang,Yaxian Chen,Longfei Fu,Jie Zhou,Ling Zhang,Zhiqiang Xing,Qian Zhang,Lixin Xia
Utilizing hydrothermal synthesis, TiO 2 and g-C 3 N 4 were grown on cotton fabric. Subsequently, Ag NPs were uniformly deposited on their surfaces to produce a Ag@g-C 3 N 4 /TiO 2 cotton fabric substrate (AGTC) with dual-functionalilites of photocatalytic reusability and SERS signal amplification. The introduction of TiO 2 and g-C 3 N 4 nanocomposites significantly enhances the SERS signal on the AGTC substrate for malachite green (MG) detection. The SERS signal on the AGTC substrate is 2.28 times stronger than that on the bare silver-modified cotton fabric, with a reduced detection limit of 6.74 × 10 −13 M. Additionally, the Local Surface Plasmon Resonance (LSPR) effect induced by Ag NPs facilitates electron transfer among substrate components, markedly enhancing photocatalytic capability for degrading organic pollutants under visible light. Consequently, under visible light, the substrate rapidly degrades pollutants and reverts to a reusable state. Experimental results demonstrate the substrate's capability to continuously detect various concentrations and types of target substances, while maintaining high sensitivity. Leveraging the flexibility of cotton fabric, convenient wipe detection and self-cleaning experiments were conducted on the surfaces of different fish species, validating AGTC's outstanding sensitivity in real sample analysis. Therefore, as a flexible and reusable SERS substrate, AGTC exhibits broad potential applications in both SERS detection and photocatalytic degradation of pollutants.
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MICROCHIMICA ACTA
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2011
·Vol. 173
·期 1
·241-247
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IF 2.578
Fan Yang,Liu Jin-Hang,Lu Hai-Ting,Zhang Qin
We describe a glassy carbon electrode (GCE) modified with a film composed of Nafion and TiO 2 -graphene (TiO 2 -GR) nanocomposite, and its voltammetric response to the amino acids L-tryptophane (Trp) and L-tyrosine (Tyr). The incorporation of TiO 2 nanoparticles with graphene significantly improves the electrocatalytic activity and voltammetric response compared to electrodes modified with Nafion/graphene only. The Nafion/TiO 2 -GR modified electrode was used to determine Trp and Tyr with detection limits of 0.7 and 2.3 μM, and a sensitivity of 75.9 and 22.8 μA mM −1 for Trp and Tyr, respectively.
The electrochemical sensor based on Nafion/TiO 2 -GR composite film modified GCE was presented. The integration of TiO 2 nanoparticles with graphene provides an efficient microenvironment to promote the electrochemical reaction of amino acids Trp and Tyr. The fabricated electrochemical sensor exhibits favorable analytical performance for Trp and Tyr, with high sensitivity, low detection limit and good reproducibility.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Jianfeng Lan,Xianhui Zhang,Jiangfan Chang,Bo Wu,Baiyi Chen,Jianhua Wu
Titanium, often referred as the “metal of the ocean”, shows substantial promise for marine engineering applications. However, its widespread use remains constrained by the persistent challenge of biofouling in the marine environment, underscoring the critical need for effective anti-fouling strategies tailored for titanium. This paper develops a novel anti-fouling titanium surface, prepared through a straightforward two-step electrochemical method that completely fills the anti-fouling agent Cu 2 O into TiO 2 nanotube arrays on the titanium surface. The method achieves the complete filling of Cu 2 O into TiO 2 nanotube arrays by selectively enhancing the bottom conductivity of TiO 2 nanotube arrays and the optimized pulse deposition parameters. Anti-fouling performance evaluations demonstrate that this novel anti-fouling titanium surface exhibits excellent anti-adhesion properties against marine fouling organisms, including bacteria, diatoms, and barnacles. Furthermore, it maintains significant anti-fouling efficacy for nearly one month in the marine environment. The design and fabrication process of this novel anti-fouling titanium surface proposed in this paper provides a promising strategy for the application of titanium in the marine environment.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Chunquan Li,Zhiming Sun,Wanzhong Zhang,Caihong Yu,Shuilin Zheng
A novel 3D heterogeneous g-C 3 N 4 /TiO 2 /kaolinite composite with enhanced visible light activity was fabricated via a mild sol-gel method associated with chemical stripping and self-assembly. Compared with bare photocatalysts, the g-C 3 N 4 /TiO 2 /kaolinite 3D structure exhibits enhanced adsorption-photocatalytic degradation ability for the removal of ciprofloxacin (CIP) under visible-light irradiation, and also facilitate the recyclability of the photocatalyst as demonstrated from the reusability test. The apparent rate constant of the composite is up to around 5.35 times, 6.35 times and 4.49 times that of bare TiO 2 , g-C 3 N 4 and P25, respectively, and a possible degradation pathway was also proposed. On the other hand, the as-received composite also exhibited enriched disinfection ability towards S. aureus . It is indicated that the superoxide radical ( O 2 − ) is the main active species in the degradation process, and the superior photocatalytic performance of composite should be mainly attributed to both the improvement of light harvesting as well as the enhanced separation and transfer efficiency. It is expected that this novel ternary visible-light responding composite would be a promising candidate material for the organic pollutants degradation and bacteria inactivation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Muxi Luo,Xuejiao Qi,Tongxuan Ren,Yuxiong Huang,Arturo A. Keller,Hongtao Wang,Boran Wu,Huapeng Jin,Fengting Li
CeO 2 and TiO 2 engineered nanoparticles (ENPs) are being increasingly used in many applications. Due to their properties, heteroaggregation between these two types of ENPs is very likely, which can determine their fate and transport. However, the heteroaggregation behavior of CeO 2 and TiO 2 ENPs is still not clear, partly due to the lack of appropriate tools. In this study, we investigated the application of Turbiscan Stability Index (TSI) for the measurements of CeO 2 /TiO 2 ENP heteroaggregation. TSI was found to be effective to investigate the heteroaggregation and stability of the CeO 2 -TiO 2 ENPs system. Increasing CeO 2 /TiO 2 ENPs ratio reduces the TSI values, indicating higher stability. Fluorescence excitation-emission matrix (EEM) spectra were used to study the interface interaction between humic acid (HA) and CeO 2 /TiO 2 ENPs. The TSI value of ENPs were rising with the increasing of CeO 2 /TiO 2 ENPs ratios in the H River or Q Reservoir water. In addition, their variation trends were similar to those in well-controlled synthetic water. Proposed interaction mechanisms include surface charge attraction and competitive adsorption.
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JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Yang Yang,Lei Huang,Yongshi Huang,Mahmud Sakil,Kaige Dong,Jingxin Yang,Wei Zhang,Gaosheng Zhang,Mengmeng Jia,Zhu Xiong
Accumulation of pollutants poses significant challenges to advanced membrane process, impacting efficiency and increasing operational costs. Fulvic acid and its analogues, widely distributed natural organic compounds, degrade water quality and produce by-products in traditional water treatment processes. The presence of even trace heavy metals in water, at the same time, can have a long-term impact on human health. Addressing these issues, we developed a novel TiO 2 -polydopamine (PDA) modified polyvinylidene fluoride (PVDF) membrane (TiO 2 -PDA@PVDF) through an environmental-friendly and low-cost sol-gel method. The membrane features dense nano-TiO 2 coverage, facilitated by a crosslinked dopamine layer, enabling in-situ growth of a functional TiO 2 layer via hydrothermal treatment. This hybrid membrane demonstrates superior adsorption, permeation, and photocatalytic self-cleaning capabilities. Performance analysis demonstrates over 90 % removal efficiency for humic acid and 85–95 % for heavy metals (Tl + , Sb 3+ , and Cr 6+ ). During humic acid separation, the initial flux of nano-TiO 2 membrane was 432 L/m 2 ·h, however, the flux attenuation (63 %) was smaller than unmodified membrane (91 %). Notably, the membrane maintained a flux loss ratio of less than 10 % after multiple operations and self-cleaning cycles, showcasing its robustness and sustainability. The TiO 2 -PDA@PVDF membrane not only effectively intercepts and adsorbs contaminants but also recovers its performance through photo-regeneration facilitated by trace hydrogen peroxide and UV light. These results highlight the membrane's potential for sustainable water purification, presenting a promising solution for both fouling mitigation and enhanced efficiency.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Yunfei Yang,Hongfang Shen,Congcong Ma,Dong Li,Bo Ma,Youjun Lu,Yanmin Wang
A composite photocatalyst with carbon-coated CuNi nanoparticles-loaded TiO 2 nanotubes (C@CuNi/TiO 2 ) was synthesized via a microwave hydrothermal alkali stripping method combined with subsequent in-situ carbothermal reduction. The structure, morphology, and surface chemical composition were investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The findings demonstrate that the microwave hydrothermal alkali peeling enables the formation of a three-dimensional C@CuNi/TiO 2 composite structure. The results of transient photocurrent response ( i - t ) and electrochemical impedance spectroscopy under visible light demonstrate that C@CuNi/TiO 2 exhibits a reduced rate of electron-hole recombination and lower surface resistance compared to C@TiO 2 , C@Cu/TiO 2 , and C@Ni/TiO 2 . After a two-hour exposure to visible light, the composite photocatalyst C@CuNi/TiO 2 , featuring a molar ratio of 2 % CuNi nanoparticles to TiO 2 nanotubes, exhibited remarkable degradation activity towards organic dyes (Rhodamine B (RhB), Methylene Blue (MB), Methyl Orange (MO)), as well as antibiotics (tetracycline (TC) and levofloxacin (LVFX)). After 5 cycles of photocatalytic reaction, the photodegradation activity of RhB remained above 79 %. It is indicated that CuNi nanoparticles effectively trap and enrich photoelectrons through the photoexcitation of TiO 2 nanotubes. Additionally, the local surface plasmonic resonance (LSPR) effect of CuNi nanoparticles reduces the recombination rate of photogenerated electron/hole and the electron transport resistance in the composite photocatalyst, thereby enhancing its overall photocatalytic activity.
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CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Yongqi Zhao,Junjie Jiang,Yang Zou,Pu Wang,Xue Li,Xiaolong Liu,Tingyu Zhu
The catalyst cost is a key factor limiting the CO purification of sintering flue gas. Here, an ultra-low-loading high-entropy catalyst was prepared by simple calcination process. By anchoring multiple active metal sites in the stable anatase TiO 2 phase, it shows efficient CO catalytic oxidation activity. The metal components (Pt, Mn, Fe, Co, Ni) were uniformly dispersed on the surface of TiO 2 in the form of high-entropy compounds and undergo strong metal and support interaction with TiO 2 . The results showed that 0.1(PtMnFeCoNi)/TiO 2 achieved complete oxidation of CO at 230 °C, and its catalytic oxidation ability was significantly better than that of the corresponding monometallic and bimetallic catalysts. The high-entropy component adjusts the electronic environment between the TiO 2 support and the metal to promote the reduction of the Ti 3 d band gap, enhances the electron-induced ability of the catalytic system to gas molecules (CO and O 2 ), and exhibits excellent resistance to SO 2 and H 2 O. The work is of great significance to understand the synergistic regulation of catalyst activity by multiple metal at the atomic level and provides a strategy for effectively reducing the content of precious metals in the catalyst.
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Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Xuewu Li,Chenghu Ma,Tian Shi,Hejie Yang,Chuanwei Zhang,Wei Qi,Chen Li,Rongrong Liu,Weiping He,Yuanhai Liu
Aluminum-Lithium (Al-Li) alloys widely used in aerospace manufacture are highly susceptible to corrosion, which limits their industrial applications. Herein, 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) is used as a modifier for low-surface-energy treatment of TiO 2 nanoparticles. The water-based polyurethane (PU) is made as a binder to achieve a tight bonding between modified ceramic particles and Al-Li alloy, thus resulting in the extremely-feasible air-spraying preparation of a superhydrophobic coating with strong abrasion resistance. The water contact angle (CA) of as-prepared coating achieves 160 ± 0.83°, and the rolling angle (SA) is as low as 5.95 ± 0.59°. The surface structure, organization and composition are further characterized using SEM, EDS, XPS and laser confocal microscopy. Meanwhile, the electrochemical impedance and potentiodynamic polarization tests are performed for corrosion characterization. The results show that the corrosion potential of such coating increases by 170 mV compared with substrate, the corrosion current density decreases by two orders of magnitude, and the impedance modulus increases by two orders. The corrosion inhibition rate of the as-prepared coating is 98.8%, indicating that the corrosion resistance has been significantly enhanced. In addition, the mechanical robustness and stability of the coating is evaluated and confirmed using a sandpaper rubbing test. It also possesses great self-cleaning, anti-pollution and thermostable behaviors, thereby allowing them to work in extreme manufactures. Moreover, the as-prepared coating exhibits excellent adaptability to various materials and anti-icing property. This work sheds positive insights in enlarging industrial applications of multifunctional ceramic coatings in aerospace fields.
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