PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 46
·26828-26837
·
IF 3.43
Zhimin Mao,Weiqing Liu,Hongfeng Cai,Jing Shi,Zongjian Wu,Yan Yang,Junhong Duan
In this study, a quartz crystal microbalance (QCM) in situ method is used to study the kinetic and thermodynamic processes of the adsorption of ruthenium-based dyes (N719, N3, N749), and the co-adsorbent chenodeoxycholic acid (CDCA) on the TiO2 film surface. The results of the kinetic studies show that the adsorption rate of N749 is slightly higher than the other two dyes, and the adsorption rate of CDCA is more sensitive to temperature change. The adsorption mechanism of the dye and CDCA on the surface of TiO2 can be reasonably inferred based on the result of the activation energy. The isotherm adsorption model studies show that the ratio of the number of surface molecules (296 K) is n(N719) : n(N3) : n(N749) : n(CDCA) = 0.69 : 1.48 : 0.50 : 1. The Keq value of CDCA is about two orders of magnitude smaller than that of all the dye molecules, which indicates that the adsorption strength of CDCA is much weaker than that of the dye molecules. Thermodynamic studies show that the adsorption reaction is an endothermic reaction. The ΔS is ΔS(N3 = 143.11 J mol−1) > ΔS(N719 = 112.72 J mol−1) > ΔS(N749 = 109.43 J mol−1) > ΔS(CDCA = 96.14 J mol−1). The Gibbs free energy ΔG is negative, and indicates that the adsorption reaction of the four molecules on the surface of the TiO2 film is spontaneous. The results of this paper show that the tedious and lengthy experimental process of the traditional method can be simplified by QCM. In addition, the development of this study provides a certain theoretical and experimental basis for future studies on the interaction mechanism between dyes and co-adsorbents.
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Materials Today Nano
·
2026
·
IF 7.6
Liangyun Yu,Lingling Huang,Rui Na,Meng Yuan,Zhaoyong Luo,Qi Zhang,Baocai Xu,Qin Xu
Developed crystal phase-tunable Cu-TiO 2 @g-C 3 N 4 with excellent photoelectric property. • Synergistic MIP-heterojunction system enabled efficient recognition of DOP. • The DOP sensor exhibited a very wide linear range and a femtomolar detection limit. • The new sensor has been successfully applied to detect DOP in the real samples. Di-n-octyl phthalate (DOP), a pervasive endocrine-disrupting contaminant in food packaging, plastic products, and aquatic systems, poses severe threats to ecosystem stability and human health. This work proposed a novel molecularly imprinted polymer (MIP)-integrated photoelectrochemical (PEC) sensing strategy for ultra-selective detection of DOP based on a rationally designed crystal phase tunable Cu 2+ -doped TiO 2 @g-C 3 N 4 composite. By lattice-doping TiO 2 with Cu 2+ to generate impurity energy levels, it was possible to precisely tune its band structure and narrow its bandgap. Subsequently, the obtained Cu-TiO 2 was hybridized with two-dimensional g-C 3 N 4 through energy-level matching, forming a tightly coupled structure at the heterojunction, which had strong interactions and thus opened up directional charge separation and transport channels. The precisely controlled heterogeneous and interfacial properties of the Cu-TiO 2 @g-C 3 N 4 matrix were confirmed through characterization methods such as SEM, TEM, HRTEM, XPS and XRD. The fabricated sensor achieved an extremely wide linear detection range of 10 fM to 1 nM, with an ultra-low limit of detection down to 5.30 fM, alongside exceptional anti-interference capability and practical reliability in real sample assays. This study delivered a low-cost, easily miniaturized PEC-MIP platform for trace DOP monitoring, opening up a new high-performance approach for on-site food safety screening and environmental water quality assessment.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xuran Sun,Jian Jiang,Yong Yang,Yu Shan,Lunlun Gong,Mei Wang
Photoelectrochemical (PEC) water splitting is a promising but immensely challenging technology for sustainable production of hydrogen. To this end, highly active, durable, and inexpensive photocathodes that operate under conditions compatible with those for photoanodes are desired. Herein, Si-based composite photocathodes were constructed by coating the front surface of Si with an N-doped carbon nanolayer and then a TiO2 protective layer, followed by decorating the electrode surface with Ni and Ni–Mo catalysts. The carbon nanolayer, denoted as CPDA, was formed directly on the Si surface by in situ self-polymerization of dopamine, followed by carbonization of the polydopamine (PDA) coating. The performance of the as-fabricated Si photocathodes with and without the CPDA layer was comparatively studied for PEC hydrogen evolution reaction (HER) in alkaline electrolytes to evaluate the effect of the sandwich CPDA layer in between the Si substrate and the TiO2 layer on the photoelectrocatalytic behaviors of Si-based electrodes. The photocathodes containing the CPDA layer demonstrated lower electron transfer resistance, higher built-in photovoltage, and larger band bending relative to the analogous electrodes without the CPDA layer. Accordingly, the short-circuit photocurrents of the Ni and Ni–Mo-decorated photocathodes with the CPDA layer were enhanced by a factor of 2.8–3.3, and their open-circuit photovoltages were enlarged by 0.14–0.22 V, compared to those of the corresponding electrodes without the CPDA layer in 1 M KOH under simulated 1 sun illumination. Moreover, the photocathodes with the CPDA layer also exhibited an improved stability for PEC HER in alkaline solutions, with a faradaic efficiency of 90–97% in the initial hour.
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SN Applied Sciences
·
2019
·Vol. 1
·期 8
·1-8
·
IF 0
Xu Tingting,Wu Haotian,Cui Kun,Zhao Qiaoling,Huang Jin,Wei Liuhe,Ma Zhi
Abstract The hybrid TiO 2 /WO 3 nanoparticles with different doping ratios of tungsten were synthesized from titanium tetra-isopropoxide and tungsten hexachloride (WCl 6 ) as precursors via a sol–gel process using poly( ε -caprolactone)- b -poly(acrylic acid) (PCL- b -PAA) diblock copolymer as a template. The morphology, crystal structure, chemical and physical property of the fabricated TiO 2 /WO 3 nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy and so on. N 2 adsorption–desorption analysis revealed that the surface area (40.6 m 2 g −1 ), pore volume (0.11 cm 3 g −1 ) and average pore size (8.56 nm) of such TiO 2 /WO 3 nanoparticles. The resulting hybrid TiO 2 /WO 3 nanoparticles (average diameter: ca. 100–200 nm) with proper doping ratio of tungsten exhibited the enhanced photocatalytic activity than that of the commercial P25 in the degradation of methylene blue. Graphic Abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Kexin Li,Zhenxing Zeng,Liushui Yan,Mingxin Huo,Yihang Guo,Shenglian Luo,Xubiao Luo
A series of nonmetallic elements co-doped titanium dioxide coated carbon nitride nanotubes (C/X-TiO 2 @C 3 N 4 NTs, X = N, F, Cl) was successfully prepared by a simple sol-gel-pyrolysis process using phenolic organic pollutants, titanium butoxide, and carbon nitride nanotubes as precursors. The morphology, porosity, phase and chemical structure, and optical and electronic property of as-prepared C/X-TiO 2 @C 3 N 4 NTs were well characterized. The as-prepared C/X-TiO 2 @C 3 N 4 NTs exhibited excellent visible-light photocatalytic activity in the conventional degradation and hydrogen evolution systems compared with traditional TiO 2 /g-C 3 N 4 heterojunction, which is attributed to their unique tubular nanostructure and nonmetallic elements co-doped TiO 2 component. Subsequently, the visible-light photocatalytic activity of C/X-TiO 2 @C 3 N 4 NTs was further studied in the simultaneous hydrogen evolution with organic pollutant degradation system on the basis of our previous work. The reaction mechanisms in different photocatalytic systems were further discussed in detail.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hongtao Liu,Chong Chen,Yucheng Liu,Haoran Sun,Xu Huang,Zhijing Wang,Lizhang Wang
Electrochemical oxidation (EO) has emerged as a promising technology for eliminating recalcitrant organic pollutants from wastewater, yet its industrial implementation is constrained by the intrinsic limitations of conventional anodes, including sluggish charge transfer kinetics, rapid passivation, and excessive energy consumption. The simultaneous resolution of these drawbacks at low cost remains challenging. Herein, we engineered high-efficiency and stable CoNi-Sb-SnO 2 /enhanced TiO 2 nanotube arrays (ETNA) anode through a novel dual-strategy cobalt doping. Cobalt-triggered electron shuttling and ETNA interlayer optimization synergistically enhances the electrode’s electrocatalytic activity, conductivity, and stability. Experimental results reveal that Co dopants create electron-deficient centers to enrich charge density on adjacent Sn/Sb sites, synergizing with Ni-mediated O 3 production to enable ultrafast hydroxyl radical (·OH) yield (93.9 % tetracycline removal in 30 min) across a broad pH range. Crucially, the cobalt-bridged ETNA interlayer, with enriched oxygen vacancy and reconstructed anode surface, significantly reduces charge transfer resistance by 62.2 % and suppresses substrate corrosion, extending the anode lifespan to 15.7-fold while saving 54.8 % energy consumption. Density functional theory (DFT) calculations further corroborate that Co doping declines the d-band center, weakening oxygen intermediate adsorption and facilitating ·OH desorption. This work establishes a paradigm for achieving comprehensive electrode performance enhancement through targeted electronic structure engineering, enabling the development of cost-effective and durable anodes with direct applicability to low-concentration organic wastewater treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Jian Liu,Ming Xia,Rong Chen,Xun Zhu,Qiang Liao,Dingding Ye,Biao Zhang,Wei Zhang,Youxu Yu
Photocatalytic fuel cell (PFC) is a promising wastewater treatment technology, which cannot only purify wastewater but also generate electricity using solar energy. In this study, a membrane-less visible-light responsive micro PFC was developed, where the CdS/ZnS-TiO 2 deposited on a conductive glass as a photoanode and CuO deposited on the porous carbon paper as an air-breathing photocathode were laterally arranged. Such design allows for both the photoanode and photocathode to be irradiated simultaneously from one side and enhances photon and mass transport. It was found that the developed micro PFC with dual photoelectrodes well responded to light illumination and exhibited good long-term performance. Experimental results also showed that upgrading the light intensity and methanol and electrolyte concentrations could improve the discharging performance because of larger amount of generated electron-hole pairs and more hole scavengers resulting from the enhanced transport. Besides, it was also found that although the increase of the liquid flow rate from extremely low rate to a moderate one caused the residence time to be lowered, positive contribution resulting from enhanced mass transport was more significant, leading to the improved performance. However, too high liquid flow rate resulted in critical low residence time, which made the discharging performance worse. The feasibility of the developed micro PFC with dual photoelectrodes toward the applications of using solar energy to remove organic pollutants contained in wastewater and simultaneously generate electricity is demonstrated in this work.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2014
·
IF 3.107
Qing Shen,Hon-Yeung Cheung
A solid-phase extraction (SPE) procedure, using titania-coated silica (TiO2/SiO2) core–shell composites as the sorbent, combined with a liquid chromatography–tandem mass spectrometry (LC–MS/MS) method was developed for extraction, visualization, and quantification of phospholipids in shrimp waste (Litopenaeus vannamei). The SPE protocol was optimized, and the best conditions were pH 5 of the loading solvent, 10% aqueous methanol as the washing solvent, and 1.0 mL of chloroform/methanol (1:2, v/v) as eluting solvents. Afterward, the eluate was separated on a diol hydrophilic interaction chromatography (HILIC) column. A total of 69 phospholipid species were identified and determined. The results indicated that, in comparison to previously published methods, this strategy was cost-effective and efficient in extraction, characterization, and determination of phospholipids. Meanwhile, phospholipids were abundant in shrimp waste, most of which contained unsaturated fatty acyl chains, such as 18:3 [α-linolenic acid (ALA)], 20:5 [eicosapentaenoic acid (EPA)], and 22:6 [docosahexaenoic acid (DHA)]. The successful application of this strategy paves the way for full use of traditionally discarded shrimp wastes.
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CATALYSIS SURVEYS FROM ASIA
·
2025
·
IF 2.3
Jiang Huanjin,Yang Jie,Wang Wenhao,Fang Hailong,Chen Jixiang
TiO 2 supported Ni 3 Sn 2 intermetallic compound (IMC) catalysts were prepared by the coprecipitation method using resorcinol–formaldehyde resin (RF) and sodium dodecyl sulfate (SDS) as templates, and they were tested for in situ hydrodeoxygenation (HDO) of methyl palmitate using methanol as the hydrogen donor in the aqueous phase. It has been found that introducing SDS and RF enhances specific surface area, pore volume and pore diameter and reduces the Ni 3 Sn 2 IMC particles and their electronic interaction with TiO 2 . In in situ HDO of methyl palmitate, the catalysts prepared with co-introducing RF and SDS exhibit higher activity than that without templates and those separately introducing RF and SDS. The catalyst activity is mainly related to the Ni 3 Sn 2 IMCs particles size and the degree of the electronic interaction between Ni 3 Sn 2 and TiO 2 . The catalyst with introducing a suitable amount of RF and SDS gives the n-pentadecane yield of 87.3% at 330 °C, and it is slightly deactivated after reaction for five times due to carbon deposition and the sintering of Ni 3 Sn 2 IMC particles.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Dongxue Yu,Yimin Tang,Ziqi Liu,Lihui Hu,Xin Jiang,Bing Zhao,Libin Yang
Developing new-type semiconductor surface-enhanced Raman scattering (SERS) platform with synchronous enhancement of sensitivity and stability is an effective strategy for achieving ultra-sensitive detection of emerging pollutants in various pollution scenarios. In this work, a new g-C 3 N 4-x /N-doped TiO 2-x (g-C 3 N 4-x /N-TiO 2-x ) heterojunction SERS matrix was purposefully developed by a combined strategy of interface engineering and defect engineering. During the formation of heterojunction, “N-bidirectional migration” between two monomers can be achieved (that is, N vacancies and N doping can be generated simultaneously), which achieves a synchronous modulation of the atomic and electronic structures of the heterojunction. This endows g-C 3 N 4-x /N-TiO 2-x with excellent interfacial performance, abundant defect states, as well as ultra-high stability. The enhancement factor of the SERS matrix is as high as 10 9 . Theoretical calculations and experiments reveal the contribution of charge transfer (CT) mechanism to the SERS enhancement. The high-efficiency carrier separation induced by the strong interface coupling effect and the multi-channel CTs mediated by multiple defect states (vacancy defects and doping defects) are jointly responsible for the observed huge SERS enhancement. Benefiting from its high SERS sensitivity (selectivity) and excellent stability, g-C 3 N 4-x /N-TiO 2-x can be applied for ultrasensitive detection of antibiotic pollutants in multiple scenarios, including animal-derived foods such as milk, sour milk and beef, as well as natural water systems such as lake water and seawater. The detection limit of several typical antibiotic residues (enoxacin, ciprofloxacin, sulfamethoxazole and florfenicol) is as low as 1 × 10 −11 mol/L.
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Nanoscale
·
2021
·Vol. 13
·期 28
·12342-12355
·
IF 7.79
Zhaokun Ding,Zhen Liu,Changfa Xiao
Despite recent efforts, there are still significant challenges in preparing hyper-hydrophobic membranes using environmental-friendly materials and simple methods. In this work, using phase separation theory, we prepared a fluorine-free hyper-hydrophobic porous hollow composite membrane using one-step ultrasound dip-coating. Then, fluorine-free modified titanium dioxide, polydimethylsilane and polypropylene was used to construct the porous membrane with a water contact angle of 161°. The distribution of surface elements, morphology, wetting and the scale of titanium on the membranes was characterized using X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM), the water contact angle and acid-alkali stability, wetting resistance, and so on. The membrane was evaluated for desalination in the presence of organic-pollutants. Under longer-term vacuum membrane distillation, compared with the general polypropylene membrane, the flux of the hyper-hydrophobic membrane increased to 12.17 kg (m2 h)−1, and the rejection rate reached 99.99%. These results indicated that the free-fluorine hyper-hydrophobic membrane could be used for seawater desalination. Finally, our results indicate that the hyper-hydrophobic modified membrane has good potential for use in industrial desalination.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Manoj Pudukudy,Qingming Jia,Jingyou Yuan,Sivagnanam Megala,Ramesh Rajendran,Shaoyun Shan
A single-pot surfactant-free sol-gel method is reported for the facile and bulk synthesis of ultrafine-nanospherical CeO 2 /TiO 2 composites with different CeO 2 loadings and their photocatalytic-activity for the degradation and mineralization of tetracycline (TC) under visible-light irradiation is investigated for the first time. The incorporation of CeO 2 favored the controlled crystalline growth of TiO 2 in its anatase phase, and their crystallinity and particle size were significantly decreased. The textural and optical properties of TiO 2 were also improved with the incremental addition of CeO 2 by increasing their specific surface-area and visible-light absorption respectively. The optical band gap of TiO 2 decreased to 2.24 eV with the incorporation of 1% CeO 2 and it further decreased to 2.21 eV with the incremental amount of CeO 2 . Due to the formation of heterojunction in the composite, the recombination rate of electron-hole pairs was significantly decreased. A highest TC removal efficiency of ~99% was observed for 4% CeO 2 /TiO 2 composite for a period of 80 min of visible-light irradiation. Moreover, 88.2% TC mineralization efficiency was achieved for a period of 240 min of visible light irradiation. The enhanced catalytic-activity could be attributed to the synergy of high degree of adsorption followed by an enhanced photocatalysis at the heterointerface formed by the adjacent contact between TiO 2 and CeO 2 . The synergistic effects of low-particle size, high surface-area, enhanced visible-light absorption, reduced band-gap, and increased life-time of the photogenerated charge-carriers through the formation of heterointerface contributed to its high photocatalytic activity. The hydroxyl and superoxide-anion radicals played a superior role in the photocatalytic process. Moreover, the composites retained its efficiency for seven-cycles of reaction without any significant-loss in its activity and structural and textural stability.
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