SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yong Li,Xinyue Yang,Mengyao Wang,Deyun Yue,Jun Wu,Haojie Song
The pollutants present in wastewater can cause structural damage to evaporators, thereby reducing their evaporation efficiency and hindering the application of solar-driven water evaporation technologies. Here, the TiO 2 -based evaporator (CPM-Air) with highly efficient photodegradation and solar-powered water evaporation performance for simultaneous freshwater production and decontamination was prepared by pyrolysis NH 2 -MIL-125(Ti) grown on the surface of Carbon Felt (CF). The evaporation rate of CPM-Air evaporator reached 2.21 kg m -2 h −1 under 1.0 kW/m 2 , and high solar-vapor conversion efficiency of 102.20 %. Meanwhile, the Anatase TiO 2 obtained by carbonized NH 2 -MIL-125 (Ti) has more active sites for removal pollutants. CF as the catalytic promoter to accelerate electron transport, and improve the photogenerated electron-hole separation efficiency. The photothermal-photocatalytic synergy removal efficiency of high concentration (50 mg/L) CIP was 2 times higher than photocatalytic only. In addition, the CPM-Air evaporator has high water evaporation rate in different harsh environments, the 99.9 % of metal ions removal and excellent salt resistance. More importantly, the growth experiments on soybean indicated that the products of photothermal-photocatalytic synergy degradation CIP of CPM-Air evaporator was non-biotoxic. This study provides valuable insights into the potential of photothermal-photocatalytic synergy for sustainable water production.
研究领域:
环境科学
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材料科学
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水资源管理
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DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Jiaojiao Yu,Yi Zuo,Gudan Li,Hong Yang,Xinwen Guo
To synthesize a high-performance titanium silicalite-1 (TS-1), this paper reports a simple and environmentally friendly approach to regulate the alkalinity in the synthesis of titanium silicalite-1 (TS-1) involving tetrapropylammonium hydroxide (TPAOH) and tetrapropylammonium bromide (TPABr). Essentially, the pH of the synthesis gel was controlled by n(TPAOH/TPA+), while keeping the total tetrapropylammonium cations (TPA+) constant. The study shows that at a relatively moderate alkalinity of pH = 10.7, TS-1 produced exhibits nanocrystalline microstructure favorable for diffusion, contains high contents of TiO4 and TiV, and delivers 94.3% of H2O2 conversion with a turnover frequency of 565.6 mol (mol h)−1 in propylene epoxidation. Through detailed analysis of crystallization processes of TS-1 at different alkalinities, this study unveils the effect of alkalinity on the rate of Si–Ti condensation, which dictates the formation of the framework structure and incorporation of Ti species into the framework. Essentially, only at moderate alkalinity of pH = 10.7, comparable Si–OH and Ti–OH condensation rates permit the highest amount of Ti being inserted in TS-1 as active (TiO4 + TiV) and limits the self-condensation of Ti species to form inactive anatase-TiO2.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 5
·1989-1998
·
IF 3.5
Yanshu Liu,Guanyun Zhang,Dexin Wang,Guanjie Chen,Fangfang Gao,Chen-Ho Tung,Yifeng Wang
A cryptand-like Ti-coordination compound, namely Ti12Cs, comprising two Ti6-salicylate cages and hosting two Cs+ ions, was synthesized by the solvothermal method. It exhibits strong visible-light absorption with an absorption band edge of 652 nm, attributed to the electron transition from salicylate ligands to Ti ions. Electrochemical impedance, visible-light transient photocurrent response, and photoluminescence spectra confirm that Ti12Cs has excellent visible-light response and charge-separation properties. Ti12Cs can be used as a heterogeneous and recyclable photocatalyst for CO2/epoxide cycloaddition, with high utilization efficiency of visible-light under mild conditions. The mechanism investigation points to a synergistic effect of photocatalysis and Lewis acid catalysis.
研究领域:
材料科学
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环境科学
·
化学
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DOI
PubMed
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·
IF 2.1
Mengwen Zhang,Na Cao,Fanyu Meng,Lutong Yang,Binyang Jiang,Jinsheng Li,Lei Fan,Shoulei Yang
High-toughness Al 2 O 3 –Ti(C,N) composites reinforced by cBN particles were prepared by the new oscillating pressure sintering technique. The density, phase, and microstructure evolution of the Al 2 O 3 –Ti(C,N)-cBN composites sintered at different temperatures were studied, and their effects on the mechanical properties were investigated. The results show that when the sintering temperature increases from 1300 to 1500°C, the heat preservation time shortens, whereas the density and interface bonding strength of the composites increase. In addition, cBN particles can play the role of crack bridging and be pulled out when the composites fracture, improving the toughness of the Al 2 O 3 –Ti(C,N)–cBN composites. However, when the sintering temperature further rises to 1600°C, a new phase of TiB 2 forms, and the solid solubility of C and N in Ti(C,N) increases, leading to a decrease in density and mechanical properties. As a result, when the Al 2 O 3 –Ti(C,N)–cBN composite is sintered at 1500°C, its mechanical properties reach the maximum values of 21.5 GPa, 5.7 MPa m 1/2 , and 731 MPa for hardness, fracture toughness, and flexural strength, respectively.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Zijun Yang,Qiang Yu,Hua Wang,Qingfeng Ge,Xinli Zhu
Ketonization of propionic acid has been investigated on Lewis acidic TS-1 and Ti-Beta zeolites to understand the reaction mechanism and effects of pore topology and hydrophobicity. Characterizations showed that TS-1 and Ti-Beta (Si/Ti = 40) exhibited a similar acidity whereas TS-1 was more hydrophobic than the silanol-rich Ti-Beta. TS-1 showed higher activity, selectivity, stability and was more resistance to H 2 O than Ti-Beta. A combination of infrared spectroscopic, isotopic and kinetic studies showed that the molecularly adsorbed monodentate propionic acid is the most abundant reactive intermediate, and C-C coupling is the rate-determining step. The mechanism of ketonization of propionic acid at isolated tetrahedral Ti centers can be described by a Langmuir-Hinshelwood model. The turnover rate on TS-1-40 is ∼ 1.3 times higher than that on Ti-Beta-40, which is consistent with the lower fitted free activation energy, i.e., the energy difference between C-C coupling transition state and two co-adsorbed propionic acids at a Ti center. The slightly lower activation enthalpy on Ti-Beta-40 than TS-1-40 is over-compensated by much larger entropy penalty, due to more silanol groups and hydrogen bonded propionic acids in close proximity to the Ti center for Ti-Beta-40, which impose additional steric hindrance to bulkier C-C coupling complex at transition state and outweigh the difference of steric hindrance of pore confinement between MFI and BEA frameworks. This work provides insight into the ketonization mechanism on Lewis acidic zeolites, and indicates that moderate pore size with hydrophobic property promotes ketonization of carboxylic acid at isolated tetrahedral Ti centers confined in zeolites.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 17
·49301-49313
·
IF 5.8
Abd El-Monaem Eman M.,Eltaweil Abdelazeem S.,El-Subruiti Gehan M.,Mohy-Eldin Mohamed S.,Omer Ahmed M.
Water pollution is a dreadful affair that has incessantly aggravated, exposing our planet to danger. In particular, the persistent nitro aromatic compound like nitrophenols causes anxiety to the researchers due to their hazardous impacts, excessive usage, and removal difficulty. For this purpose, a novel multi-featured composite was constructed based on κ-Carrageenan (κ-Carr), MOF (MIL-125(Ti)), and magnetic Fe 3 O 4 for efficient adsorptive removal of o-nitrophenol (o-NP). Interestingly, BET measurements revealed the high surface area of Fe 3 O 4 -κ-Carr/MIL-125(Ti) of about 163.27 m 2 /g, while VSM showed its excellent magnetic property (20.34 emu/g). The comparison study pointed out the synergistic effect between Fe 3 O 4 , κ-Carr, and MIL-125(Ti), forming a composite with an excellent adsorption performance toward o-NP. The adsorption data obeyed pseudo-second-order kinetic model, and Freundlich isotherm model was better fitted than Langmuir and Temkin. Furthermore, Langmuir verified the supreme adsorption capacity of o-NP onto Fe 3 O 4 -κ-Carr/MIL-125(Ti) since the computed q max reached 320.26 mg/g at pH 6 and 25 °C. Furthermore, the XPS results postulated that the adsorption mechanism pf o-NP proceeded via H-bonding, π - π interaction, and electron donor–acceptor interactions. Interestingly, Fe 3 O 4 -κ-Carr/MIL-125(Ti) composite retained good adsorption characteristics after reusing for five cycles, suggesting its viable applicability as an efficient, renewable, and easy-separable adsorbent for removing nitro aromatic pollutants.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Shaoxiang Xu,Meihua Zhu,Pengming Huang,Shengao Zheng,Yujie Qiao,Yuan Liang,Xiangshu Chen,Hidetoshi Kita
Nano-size titanium silicalites is difficult to be separate from the reaction solution, lamellar and homogeneous Ti-MWW zeolites are successfully formed a dense zeolite layers on α-Al 2 O 3 pellets by secondary hydrothermal synthesis in this study. Seeded crystals concentration and titanium source have significantly influences on the morphology, thickness and titanium active sites of Ti-MWW zeolites. Doping NH 4 F in the precursor synthesis solution could conducive to prepare macroscopically and anatase-free Ti-MWW zeolites layer on the outside of α-Al 2 O 3 pellets, and the thickness of the Ti-MWW zeolites layer is ca. 1 mm. Besides, catalytic performance of the supported Ti-MWW zeolites are significantly improved by NH 4 F. A fixed-bed reactor with the supported Ti-MWW zeolites are applied to catalyze phenol hydroxylation with hydrogen peroxide efficiently, and reaction time and temperature, amount of the supported Ti-MWW zeolites have obvious effects on the phenol conversion and dihydroxybenzene selectivity. When the actual mass of Ti-MWW zeolites to volume of reaction solution is only 10 g/L, the relative phenol conversion and dihydroxybenzene selectivity are 46.45% and 92.72% at 65 °C after 3 h, respectively.
研究领域:
催化
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材料科学
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化学工程
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jiepeng Zhao,Yifei Ma,Zhaomin Tong,Mei Wang,Liantuan Xiao,Suotang Jia,Xuyuan Chen
Engineering photocatalyst crystal facets and constructing heterojunctions are effective strategies to improve photocatalytic activity. The amino-modified titanium-based metal–organic framework (MOF) NH 2 -MIL-125(Ti) (NM) has drawn extensive attention as a photocatalyst by virtue of its high specific surface area, abundant pore structure, and narrow bandgap. However, its catalytic activity is hindered by fast electron-hole recombination and limited light absorption. This study synthesizes NM with engineered crystal facets and Co 3 O 4 @NH 2 -MIL-125(Ti) (C-NM) composites with varying Co 3 O 4 loadings using a facile hydrothermal method. The impact of heterojunctions and facet design on photocatalytic CO 2 reduction under visible light is also studied. Results show that the C-NM, with exposed {111} facets and optimal Co 3 O 4 loading, demonstrates superior photocatalytic CO and CH 4 production rates of 21.64 μmol h −1 g −1 and 3.99 μmol h −1 g −1 , 2.1 and 1.6 times higher than those of NM {001} , respectively. Experimental characterization and density functional theory (DFT) analyses attribute the improved photocatalytic activity to several mechanisms. First, crystal facet modulation can optimize the active sites and specific surface area of the photocatalysts. Second, by loading the narrow-bandgap Co 3 O 4 nanoparticles, bandgap of the C-NM photocatalyst is further reduced, thereby enhancing the absorption and utilization of visible light. Finally, the NM/Co 3 O 4 heterostructure minimizes electron-hole recombination, significantly boosting CO 2 reduction efficiency.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yangjie Fu,Kejie Zhang,Yi Zhang,Yanqing Cong,Qi Wang
Visible-light-active MR/NH 2 -MIL-125(Ti) homojunction was successfully synthesized via post-synthetic modification of NH 2 -MIL-125(Ti). A chromophore group (–MR) similar to the structure of methyl red, was introduced to partially replace the –NH 2 group. Using pure NH 2 -MIL-125(Ti) and MR-MIL-125(Ti) as control samples, the possible structural and optical changes were carefully studied. It was found that the lattice structure remained unchanged, while the specific surface area and band gap were in the order of NH 2 -MIL-125(Ti) > MR/NH 2 -MIL-125(Ti) > MR-MIL-125(Ti). Despite of these, MR/NH 2 -MIL-125(Ti) exhibited highest photocurrent response and lowest charge transfer resistance, which were associated with optimal photocatalytic performance. For the photocatalytic reduction of Cr(VI), the estimated rate constant on MR/NH 2 -MIL-125(Ti) was ca. 9 times and 3 times relative to that on NH 2 -MIL-125(Ti) and MR-MIL-125(Ti), respectively. Besides, 4.6 times rate enhancement can also be observed on the homojunction relative to physical mixture (MR/NH 2 -MIL-125(Ti)-PM). The boosted photocatalytic performance may be ascribed to promoted separation and transfer of photogenerated electron-hole pairs. The operating factors was optimized at acidic pH (2.0), lower catalyst dosage (0.1 g/L) and appropriate concentration of coexisting organics (2.0 mM) within the tested range. Furthermore, good stability both in photocatalytic performance and structure were also observed after 5 cyclic runs. Thus, this study report a facile way for the construction of visible-light-active MOFs, and provided a stable photocatalytic candidate for the disposal of Cr(VI)-containing wastewaters.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 13
·D638
·
IF 3.12
Pengfei Xu,Xiaohong He,Junwei Mao,Yongming Tang
In this paper, Ti/SnO2-Sb/Ce-PbO2 anode is electrodeposited from MSA bath, and the effect of Ce3+ concentration in bath on the phase composition and morphology of lead dioxide electrode is elucidated. It is found that with the addition of 2 mM Ce3+ ion to the bath the Ce-PbO2 anode exhibits highest stability in 0.5 M H2SO4, and cerium exists as Ce (IV) in the PbO2 film. The electrocatalytic activity of lead dioxide anode for phenol removal is slightly enhanced by the inclusion of Ce. The significant improvement in electrocatalytic activity can be achieved by the addition of small amount of Bi3+ ion to the bath containing Ce3+ ion. In this study, electrocatalytic activities of various anodes follow the order: Ce,Bi-PbO2 > Ce-PbO2 > undoped PbO2 > Bi-PbO2.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 2
·264
·
IF 2.7
Zhenying Chen,Xiuqing Cao,Yuyang Huang,Shuang Zhang,Wenjian Pan,Wen Deng
Ti-doped ZnO (TZO) and Bi2O3thin films were designed and deposited by magnetron sputtering successively on ITO glass substrate to form a Ti-doped ZnO/Bi2O3(TZO/Bi2O3) heterojunction. Microstructure and photoelectric properties of TZO, Bi2O3, and TZO/Bi2O3films were tested and characterized. The results showed that TZO film with a hexagonal wurtzite structure was preferentially grown along the crystal plane (002), had a good crystallization state, and was an N-type semiconductor film with high transmittance (90%) and low resistivity (4.68 × 10−3Ω·cm). However, the Bi2O3film sputtered in an oxygen-containing atmosphere and was a polycrystalline film that was preferentially grown along the crystal plane (111). It had a lower crystallization quality than TZO film and was a P-type semiconductor film with low transmittance (68%) and high resistance (1.71 × 102Ω·cm). The I–V curve of TZO/Bi2O3composite films showed that it had an obvious heterojunction rectification effect, which indicates that the PN heterojunction successfully formed in TZO/Bi2O3films.Keywords:TZO film;Bi2O3film;TZO/Bi2O3heterojunction;magnetron sputtering;optoelectronic properties
研究领域:
材料科学
·
半导体物理
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 23
·9085-9093
·
IF 4.569
Qiuping Huang,Mingjiao Jiang,Yingjia Li,Chao Liang,Yumei Tang,Fengyu Xie,Min Yang,Guowei Deng
In this work, we report the design and synthesis of non-noble metal-based electrocatalysts for effective overall water splitting in alkaline solutions for the development of hydrogen energy. The electrocatalysts were synthesized by a one-step hydrothermal method similar to microflower structure electrocatalysts. The synergistic effect between the special Echinops sphaerocephalus nanostructure and the nanowire can greatly improve the conductivity of the nanomaterial due to its high activity quality, fast ion transport, and exposure of more active sites, thus resulting in a better catalytic activity and a longer material stability of the electrocatalyst. For MnxCoyO4/Ti in alkaline aqueous solutions, a current density of 10 mA cm−2 is required when the voltage is only 1.60 V. In addition, the hydrogen evolution activity of electrocatalysts is 168 mV at 10 mA cm−2, the Tafel slope is 174 mV dec−1, and the oxygen evolution activity of electrocatalysts is 229 mV at 10 mA cm−2, which showed good long-term stability within 12 h, even better than that of previously reported electrocatalysts.
研究领域:
材料科学
·
电化学
·
能源材料
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）