CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yacong Yang,Zhihao Cao,Tianhan Shen,Junyang Zhang,Zuofei Gu,Mingwan Zhao,Zongli Xie,Yingchun Miao,Yuning Huo,Hexing Li
The photocatalytic membrane systems show great potential for water purification and wastewater treatment with efficient energy utilization. Herein, we develop a synergistic photocatalytic-photothermal route, based on Pd-TiO 2 /PEDOT composite immobilized in PVDF membrane, for effective water permeability and reutilization property. Novel Pd-TiO 2 /PEDOT/PVDF ultrafiltration membrane is prepared by the phase inversion method with immobilizing Pd-TiO 2 /PEDOT obtained by ultrasonic irradiation. During the removal of HA under light irradiation, Pd-TiO 2 /PEDOT/PVDF membrane presents an unexpected increasing in water flux, when compared to pristine PVDF, Pd-TiO 2 /PVDF and PEDOT/PVDF membranes, with the highest normalized flux reaches up to 2.1 and remains as 1.3 even after 300 min of irradiation. This significantly enhances the water transport, along with the achieved high rejection and anti-fouling performance. It can be attributed to synergistic photocatalytic-photothermal effect of Pd-TiO 2 /PEDOT, which is realized by their strong interaction and uniform distribution. The addition of PEDOT promotes photocatalytic effect of Pd-TiO 2 by enhancing separation of photo-induced charges. High photothermal conversion efficiency of Pd-TiO 2 /PEDOT and low temperature difference in Pd-TiO 2 /PEDOT/PVDF membrane facilitate effective thermal storage, beneficial for water transport. Meanwhile, thermal energy promotes generation of more ∙OH and ∙O 2 – radicals to remove pollutants. Synergistic photocatalytic-photothermal contribution in Pd-TiO 2 /PEDOT/PVDF membrane shows significant potential for practical application.
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SURFACE & COATINGS TECHNOLOGY
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2024
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IF 5.3
Hongpeng Zheng,Guangguang Xiang,Ali Hussein Khalaf,Bing Lin,Yingying Wang,Hailong Zhang,Junlei Tang,Yanli Zhou,Li Liu
Common techniques for creating novel coatings include chemically modifying inorganic fillers and exploring how modifications affect coating service performance. However, it frequently takes a lot of time and tedious attempts to get the ideal alteration degree for fillers. Although the surface energy of the fillers is thought to be a significant thermodynamic parameter , it is still unknown how chemical modification affects surface energy and how the properties of fillers in a coating relate to the quantization difference of thermodynamic parameters. In this study, the impact of chemical modification on the quantization difference of nano-TiO 2 surface energy has been uncovered. Creating a “wetting-reagglomeration-adsorption” isogram by utilizing three surface interfacial parameters has also been achieved: the contact angle between the liquid resin and the filler, the driving energy of the filler reagglomeration, and the polymer molecules' diffusion energy at the filler/coating interface. The relationship between the quantitative difference of thermodynamic parameters and the dispersion, compatibility and interfacial strength of the fillers in the waterborne epoxy was predicted by the isocontour map. From the isocontour map, the modified nano-TiO 2 fillers with 4.04 APTES molecules/nm 2 shows the minimum ∆ W a of 16.17 mJ/m 2 and the maximum W s of 23.15 mJ/m 2 in the composite coating , which is predicted to exhibit the best dispersibility and the strongest interfacial strength. The prediction results were successfully verified by the techniques of microscopic morphology observation (TEM and SEM), mechanical properties tests (DMA and tensile tests), and corrosion resistance tests (EIS and salt spray tests). This work has a significant guiding role in the development of the filler modifications for the creation of novel coatings.
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Inorganic Chemistry Frontiers
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2025
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IF 6.4
Guangxia Wang,Wenhui Wang,Yaozhong Yu,Tao Hu,Juan Ding,Yongming Sui
Active and durable catalysts are crucial for the hydrogen evolution reaction (HER). In the volcano plot, rhodium (Rh) and platinum (Pt) are positioned closely, while the activity and stability of Rh are much inferior to those of Pt. Here, we developed a Rh/TiO2/Ti electrocatalyst to mitigate Pt dependency. The in situ formed TiO2 with oxygen vacancies was prepared utilizing Ti foam as the Ti source. The TiO2 support can confine Rh nanoparticles and ensure charge accumulation at the Rh site, while Rh can enhance the conductivity of TiO2. DFT calculations demonstrate that the strong interaction between Rh and TiO2 could regulate the electronic structure of Rh, thereby accelerating water dissociation and optimizing the adsorption strength of *H. Consequently, compared to Rh/Ti, Rh/TiO2/Ti exhibits significantly enhanced HER activity, requiring overpotentials of only 37.3 and 34.3 mV to reach 10 mA cm−2 in the alkaline and acidic HER, respectively. Furthermore, the vertical nanoarray structure, surface roughness, and metal–support interaction endow Rh/TiO2/Ti with remarkable durability. It works in both alkaline and acidic media for 120 hours at 10 mA cm−2 with unnoticeable activity decline, outperforming commercial Pt/C. This work provides a strategy to overcome the activity and stability limitations of Rh-based catalysts, providing references for promising catalysts for water electrolysis.
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ChemCatChem
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2025
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IF 3.9
Xiaoqi Tian,Dongxu Chen,Houde She,Jingwei Huang,Lei Wang,Qizhao Wang
Volatile organic compounds (VOCs) pose significant environmental and health risks, necessitating effective remediation strategies. This study addresses these challenges by synthesizing ZnSn(OH) 6 /TiO 2 heterojunction composites using a coprecipitation-hydrothermal coupling technique. Experiments showed that the synergistic effect of ZnSn(OH) 6 and TiO 2 significantly reduced the band gap (3.10 eV) of the composites and enhanced the visible light absorption ability, whereas the photogenerated electron–hole pair complexation was effectively suppressed through the interfacial charge transfer mechanism. Under simulated sunlight, 15% ZnSn(OH) 6 /TiO 2 degraded toluene at an initial concentration of 2,500 ppm by up to 90.51% in 90 min, with a mineralization rate of more than 84.51%, which is about three times higher than the performance of pure ZnSn(OH) 6 . Cycling experiments showed that the degradation rate remained at 90.32% after five times of reuse, demonstrating excellent stability. A combination of density functional theory (DFT) calculations and radical trapping experiments revealed that ·OH and ·O 2 − were the main active species in the composites, and the hydroxyl structure of ZnSn(OH) 6 promoted the adsorption and activation of toluene. This work presents a novel interfacial engineering and crystallographic regulation strategy for deep mineralization of VOCs, providing insights for designing cost-effective, durable environmental photocatalysts. Graphical This study describes the synthesis, structural, and surface characterization of TiO 2 nanoparticle-decorated layered ZnSn(OH) 6 composite catalysts, systematically evaluates their photocatalytic activity, degradation kinetics, and long-term stability for gaseous toluene under simulated solar light, and investigates photogenerated electron-hole migration pathways, separation efficiency, and reactive oxygen species formation mechanisms.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Dejian Zhao,Zhihong Wang,Shuaishuai Lyu,Yunhao Liu,Shaohui Xiong,Yingtian Zhang,Yu Pan,Qingpeng Cheng,Xingang Li
Non-classical Fischer–Tropsch to olefins (FTO) is a crucial yet highly complex industrial reaction that enables the direct conversion of syngas, derived from renewable feedstocks such as biomass, municipal solid waste, or captured CO 2 , into long-chain olefins (C 5+ = ) via a carbide mechanism. Here, we systemically investigate mechanisms and performance of Na-modified Ru/TiO 2 catalysts in non-classical FTO, and experimentally discover a new CO insertion pathway. Our findings show that Na modification alters the adsorption and activation behaviors of CO, H 2 and intermediates, eventually manipulating reaction mechanisms. The Ru/TiO 2 catalyst with less Na exhibits high CO dissociation and C-C coupling abilities but a poor dehydrogenation ability, which mainly obeys the carbide mechanism, benefiting to produce C 5+ alkanes, rather than olefins. However, excessive addition of Na would primarily make the Ru/TiO 2 catalyst alternately follow the CO insertion mechanism, preferring to produce short olefines (C 2-4 = ) because of the poor C-C coupling ability. After rational coordination of the two pathways through regulating the Na loadings, the 0.5NaRu/TiO 2 catalyst robustly exhibits ultra-high C 5+ = selectivity (80.9%) and impressive C 5+ = space time yield (1.68 × 10 -2 mol CO g cat -1 h -1 ) at 260 °C, without deactivation for over 100 h. These findings not only provide fundamental insights into the underlying mechanisms for long-chain olefin synthesis, but also offer theoretical guidance for developing advanced catalysts for industrial applications.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Feilong Shi,Xin Wei,Xiaoqing Wu
The output performance of triboelectric nanogenerators (TENGs) can drop dramatically in high temperature environments because of the thermionic emission effect. To enhance the thermal charge stability and expand the working temperature of TENG, polyimide nanofibers (PINF) were synergistically enhanced by the electron trapping mechanism of reduced graphene oxide (rGO) and interfacial polarization of TiO 2 . With the multiple enhancement effect of polyimide/rGO/TiO 2 composite nanofibers (PRTNF) on triboelectric output, PRTNF-TENG generated an open circuit voltage of 228.26 V and a short circuit current of 5.22 μA, which were 3.80 and 3.48 times higher than those of PINF-TENG. The effective output of polymer-based TENG was investigated from 25 − 300 °C. Compared to room temperature, the PRTNF-TENG can maintain 19.45 % (44.39 V) and 18.20 % (0.95 μA) of the voltage and current at 300 °C, respectively, and still drive 50 commercial LEDs. Furthermore, PRTNF-TENGs were applied as self-powered sensors for firefighters to provide real-time motion monitoring and ambient temperature detection. This PRTNF-TENG has broad application prospects for energy harvesting and smart electronic monitor in harsh environments such as fire and space.
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2024
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IF 2.4
Zhu Liguo,Zhang Zuqing,Kong Lingxin,Wang Chengyuan,Yang Bin,Xu Baoqiang
Ti is produced by the Kroll method, mainly by carbothermic chlorination, magnesiothermic reduction, and vacuum distillation, which result in complex processes, low efficiency, and high cost. Although Ti has many excellent properties, its high production costs limit its widespread applications. There is an urgent need to develop new Ti extraction processes to reduce the cost of Ti production. In this study, we propose a new method for the direct preparation of low-oxygen Ti powder from TiO 2 using Mg as a reducing agent and the formation of CeOCl (2Mg ( l ) + TiO 2 ( s ) + 2CeCl 3 ( l ) = Ti ( s ) + 2CeOCl ( s ) + 2MgCl 2 ( l )). First, a deoxidization experiment of Ti with Mg as a deoxidizer was conducted, and the ability of Mg to deoxidize Ti was demonstrated. At 1273 K, when the activity of CeCl 3 was 1, the oxygen concentrations of Ti-A and Ti-B were 380 and 270 ppm, respectively. Subsequently, the TiO 2 reduction experiment was conducted using Mg as the reducing agent. The results showed that MgO activity was effectively reduced by the formation of CeOCl (MgO( s ) + CeCl 3 ( l ) = MgCl 2 ( l ) + CeOCl( s )). When the system reached the Mg/MgCl 2 /CeOCl/CeCl 3 equilibrium, low-oxygen Ti powder below 1000 ppm was directly produced from TiO 2 .
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ENERGY & FUELS
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2024
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IF 5.2
Dechao Wang,Lin Chen,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Rong Chen,Qiang Liao
Development of a highly performing heterojunction photoanode is significantly important for photoelectrochemical cells. Herein, a novel strategy is proposed to construct a protonated g-C3N4 nanosheets/nitrogen-doped TiO2 photoanode inspired by polydopamine microspheres. The polydopamine microspheres can enhance the adsorption of protonated g-C3N4 nanosheets via electrostatic interaction, facilitating heterojunction formation. Moreover, the addition of the polydopamine microspheres into the preparation process can not only dope a nitrogen element into TiO2, improving solar energy utilization, but also create a vigorous pore structure in the photoanode, promoting mass transport and light scattering. Besides, the specific surface area can also be increased. Owing to these merits, the photoelectrochemical activity of this newly developed photoanode is greatly improved. Furthermore, the superiority of this photoanode is evaluated by integrating it into a photoelectrochemical cell for simultaneous wastewater treatment and power generation. The maximum power density generated by the newly developed protonated g-C3N4 nanosheets/nitrogen-doped TiO2 photoanode is about 138.5% and 40.9% higher than the TiO2 photoanode and the protonated g-C3N4 nanosheets/TiO2 photoanode prepared without using the polydopamine microspheres, respectively. The present study provides a novel strategy for developing a highly performing heterojunction photoanode.
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Journal of Materials Chemistry A
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2025
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IF 9.5
Chaohui Guan,Jiefei Li,Tao Chen,Liang Lv,Junfeng Du,Shuai Zhang,Hang Wei,Haibin Chu
Developing high performance catalytic materials for the electro-oxidation of glycerol into specific value-added products is essential for glycerol valorization. Herein, we used the sol–gel method to coat the TiO2 layer with adjustable thickness on the surface of carbon nanotubes (CNTs), obtaining a unique morphology of porous sheath TiO2 wrapped CNTs (TiO2/CNTs). Subsequently, Pt nanoparticles were loaded onto TiO2/CNTs using the ethylene glycol reduction method. The prepared Pt–TiO2/CNTs catalyst achieves a glycerol conversion near 100% at 0.8 V vs. RHE and 60 °C for 10 h. Notably, the selectivity of tartronate reaches 52.5% after 24 h. Characterization results reveal that the dispersed Pt nanoparticles are embedded into the holes of the TiO2 porous sheath, fabricating abundant Pt–TiO2–CNT interface structures. The infusion of TiO2 shifts the center of the d-band upwards, and enhances the adsorption of the glycerate intermediate on Pt particles, which facilitates the further oxidation of glycerate to tartronate. This simple and efficient morphology control method provides a new strategy for glycerol valorization via electrocatalysis.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xiao Chen,Nannan Zhang,Huaming Wang,Ying Zhong,Tianming Lv,Changhai Liang
The continuous flow selective hydrogenation of maleic anhydride (MA) to γ-butyrolactone (GBL) over highly efficient and long-term stable catalysts is a considerable promising strategy for both lab-scale as well as industrial application. In this work, a PtPdCoNiCu/TiO 2 high-entropy alloy (HEA) catalyst is developed by the colloidal impregnation method, in which the HEA colloids are synthesized by lithium naphthalenide-driven reduction at mild conditions according to the redox potential of the various metals. The PtPdCoNiCu/TiO 2 catalyst exhibits highly efficient in the hydrogenation of MA with 91 % selectivity to GBL at full conversion of MA under the weighted hourly space velocity of 1.14 h −1 , 3 MPa H 2 , and 260 °C. Due to the present of oxygen vacancy in the TiO 2 support and the hydrogen spillover, the PtPdCoNiCu/TiO 2 HEA catalyst presents a low apparent activation energy (75 kJ mol −1 ), boosting the hydrogenolysis of C=O bonds for generating of GBL. The cocktail effect is presented in the PtPdCoNiCu/TiO 2 catalyst, and its catalytic activity is much better than that of corresponding monometallic and bimetallic catalysts. It realizes the reduction and substitution of precious metal catalysts. In addition, the PtPdCoNiCu/TiO 2 catalyst with sintering resistance and acid resistance shows excellent long-term stability within 132 h. This work is of great significance for understanding HEA catalysis at the atomic level and provides the possibility for developing low-cost and efficient precious metal industrial catalysts.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2024
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IF 4.7
Li-guo ZHU,Chong-lin BAI,Ling-xin KONG,Bin YANG,Bao-qiang XU
To reduce the production cost of titanium, a new method for direct preparation of low-oxygen titanium powder by the magnesiothermic reduction of TiO 2 with the assistance of a MgCl 2 -HoCl 3 molten salt was proposed. Thermodynamic calculations showed that the magnesiothermic reduction of TiO 2 was feasible. However, hindrance of the reduction reaction by the reduction by-product of MgO resulted in a considerably high O concentration in the titanium powder. The addition of HoCl 3 to the system significantly reduces the activity of MgO to produce low-oxygen titanium powder. Thermochemical deoxidation and reduction experiments were conducted with MgCl 2 -HoCl 3 molten salt in the temperature range of 1023-1273 K. The results showed that titanium powder with oxygen concentration (mass fraction) below 5.00×10 -4 can be prepared at the Mg-MgCl 2 -HoOCl-HoCl 3 equilibrium.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
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IF 7.435
Jianling Zhang,Haigang Yang,Shoubin Xu,Long Yang,Yuanqing Song,Long Jiang,Yi Dan
Conjugated polymer/TiO 2 photocatalysts hold great promise for solar chemical conversion processes by combining the advantages from both the conjugated polymer and the inorganic semiconductor, overcoming the serious drawbacks of fast charge recombination and the limited visible light absorption of inorganic semiconductor through interfacial electron transfer. To address the crucial way to promote the visible light photocatalytic activity of conjugated polymers/TiO 2 photocatalysts, P3HT/TiO 2 composites with strong interfacial interaction between P3HT and TiO 2 , which was demonstrated by the results of X-ray photoelectron spectroscopy and dissolution tests, were prepared by binding cyanoacrylic acid end-groups functionalized P3HT to the surface of TiO 2 . The pseudo-first-order kinetic constants of photocatalytic degradation of model pollutant methyl orange (MO) under visible light with P3HT/TiO 2 composites of monofunctionalized and difunctionalized polymers were 7.06 and 20.18 times as great as that of unfunctionalized polymer, respectively, indicating a remarkably enhanced visible light photocatalytic activities by an order of magnitude with the incorporation of cyanoarrylic acid end-groups. In consideration of their similar morphology, specific surface area, ability of harvesting visible light and adsorption capacities toward MO independent of end-group functionalization, the dramatically enhanced photocatalytic activity arises from the facilitated electron injection and separation of photogenerated carriers owing to strong interfacial interaction between TiO 2 and end-group functionalized P3HT, which was proved to be crucial for photocatalytic capability of conjugated polymer/TiO 2 photocatalysts, providing a new effective direction for the improvement of their visible light photocatalytic activity.
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