ACS Applied Nano Materials
·
2025
·
IF 5.5
Weijie Jia,Haifeng Wang,Chen Xue,Yaying Li,Qi Xiao
Selective hydrogenation of phenylacetylene is a crucial industrial reaction, yet developing catalysts with both high selectivity and activity remains challenging. Conventional hydrogenation catalysts often exhibit unevenly dispersed active metals, leading to agglomeration and reduced catalytic performance. Herein, with the aid of the ice-templating (ICT) strategy, we present TiO2-supported Pd nanocluster photocatalysts with ultralow Pd loading (0.1 wt %). The optimized Pd/TiO2–ICT catalyst achieves exceptional catalytic performance under ambient conditions (room temperature and atmospheric pressure) with methanol solvent and light irradiation, delivering 99% phenylacetylene conversion alongside 98% styrene selectivity. Advanced characterization reveals the catalyst’s superior structural features, including ultrasmall Pd clusters (1.2 nm diameter) and reduced Pd–Pd coordination number (6.3), which are significantly better than conventional counterparts. Systematic investigations establish a clear positive correlation between catalytic efficiency and critical structural parameters: smaller cluster dimensions and lower metal coordination numbers at equivalent Pd loadings. Mechanistic studies through comprehensive characterization elucidate that the photogenerated hydrogen radicals (•H) from methanol splitting directly drive the selective hydrogenation process. This study offers insights into both the application and structure–activity relationship of the ICT-based catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yongjun Sun,Yuanyuan Yu,Deng Li,Jun Zhai,Huaili Zheng
A hybrid flocculant, PAC-CA, with the advantages of inorganic and organic flocculants, was prepared, and the coagulation behavior and floc characteristics of PAC-CA for removing titanium dioxide nanoparticles (TiO 2 -NPs) under different conditions were studied. The effects of monomer mass ratio, initiator concentration, hydroxyl aluminum ratio, reaction temperature, and polymerization time on the coagulation performance for TiO 2 -NP removal were studied. PAC-CA was characterized through SEM, FT-IR, TG-DSC, XRD, XPS, and Ferron complex colorimetric characterization. The characterization results showed that PAC-CA was successfully copolymerized using AlCl 3 , carboxymethyl chitosan, and acrylamide. The high content of Alb in PAC-CA helped improve the coagulation performance. When the dosage was 30 mg/L, the pH was 8, the stirring intensity was 200 s −1 , and the settling time was 30 min, the optimal removal rates for TiO 2 -NPs and turbidity were 87.30% and 91.72%, respectively. Kaolin could effectively improve the TiO 2 -NP removal efficiency and promote the density and particle size of flocs. Humic acid exerted an inhibitory effect on coagulation efficiency with loose and small flocs.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yang Li,Zhao Wang,Hujie Zhao,Xiaojun Huang,Mujie Yang
Formation of heterostructure and nanostructure is promising approach to improving the photocatalytic activity of TiO 2 based photocatalysts . In this work, MoS 2 @TiO 2 @poly(methyl methacrylate) (PMMA) was prepared by freeze drying of hydrothermally treated electrospun PMMA nanofibers containing titanium n-butoxide and MoS 2 nanosheets . As-prepared nanocomposite revealed a 3D nanofiber network structure with high specific surface (83.6 m 2 /g), in which MoS 2 nanosheets loaded with TiO 2 nanoparticles were distributed on the surface of PMMA fibers. MoS 2 @TiO 2 @PMMA showed better photocatalytic performance than MoS 2 @PMMA, TiO 2 @PMMA, MoS 2 @TiO 2 and MoS 2 @P25@PMMA towards the photodegradation of methyl orange (MO) under UV illumination. Typically, MoS 2 @TiO 2 @PMMA (100 mg) could degrade MO (10 mg/L, 100 mL) completely in 40 min under UV irradiation , revealing good photocatalytic activity . Moreover, the nanocomposite could be facilely recovered by filtration, and maintain almost the same photocatalytic activity after cycling tests for ten times, indicating excellent stability and recyclability. The enhanced photocatalytic performance of the nanocomposite might relate to the heterostructure between MoS 2 and TiO 2 to suppress the recombination of photo-induced charge, and the 3D hierarchical nanoweb structure to afford large specific surface area and high density of active sites.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS COMMUNICATIONS
·
2017
·
IF 1.588
Xiaohui Ren,Hui Qiao,Zongyu Huang,Pinghua Tang,Shuhua Liu,Siwei Luo,Hao Yao,Xiang Qi,Jianxin Zhong
Hybridization of WS 2 and TiO 2 by a facile hydrothermal method was realized to construct WS 2 - TiO 2 heterostructure photodetector which exhibits preferable photoresponse activity in association with structural robustness. The relationship between photocurrent density and applied bias potential has also been uncovered. Photoresponse measurements demonstrate the photocurrent density of WS 2 - TiO 2 hybrid nanosheets (HNs) has been greatly improved when compared to that of as-prepared TiO 2 , while the steady current density can achieve 130 nA ∕ cm 2 when applied potential is 1.0 V. Besides that, the stability test exhibits no detectable distinction after processing 15 cycles. The improved photoresponse activities can be attributed into the positive synergetic effect between the WS 2 and TiO 2 . We hope the present work can provide fundamental implementations about WS 2 - TiO 2 heterostructure photodetector, meanwhile, offering it potential availabilities for constructing high-performance photodetectors.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Zhengxia Xu,Yuhong Kan,Changqing Liu
Anatase TiO 2 nanoparticles with tuning size and aspect ratio were successfully prepared by a simple solvothermal method, using ethanol as a solvent, titanium butoxide as a precursor, and oleic acid and oleylamine as anionic and cationic capping agents, respectively. The average size and aspect ratio of these nanoparticles can be greatly regulated by varying the oleic acid/oleylamine molar ratio while keeping their total molar content constant and finely adjusted by increasing the total capping agents molar concentration in solvent at constant molar ratio (oleic acid/oleylamine molar ratio = 1:1). The variation of molar ratio or molar concentration enables a manipulation of the growth rate along different facets of TiO 2 nanoparticles and, consequently, a control of the aspect ratio of these nanoparticles. Moreover, the photocatalytic degradation rate of methyl blue for sample prepared with molar ratio of oleic acid to oleylamine at 6:24 is over 11% higher than that for the other samples.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Ying Liu,Xiaoya Liu,Xinying Liu,Yajing Li,Jinghuan Ma,Cong Ma
As one of the key factors that affect the application of hydrazine hydrate as a potential hydrogen source, efficient and cheap catalyst is particularly important. Nickel based catalysts have been widely studied because of their excellent catalytic performance for the decomposition of hydrazine hydrate to hydrogen. Herein, a Ni catalyst supported on anatase TiO 2 through reduction and impregnation methods was prepared. Structure of the catalyst was investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and X-ray photoelectron spectroscopy (XPS). The effects of the amount of TiO 2 and the concentration of NaOH on the activity of the catalyst were investigated. The results showed that the catalyst prepared with a metal nickel content of 0.2 mmol using 100 mg of the nano-TiO 2 support had the best catalytic performance. Hydrazine hydrate could be completely decomposed at 343 K in 2.83 min, the hydrogen selectivity attained 100%, and the turnover frequency (TOF) value was 265.49 h −1 . In this catalyst, transition metal Ni was dispersed on the support surface in the form of amorphous elemental or oxide. Anatase TiO 2 support had the advantages of promoting the dispersion of metal Ni, exposing the active site, changing the electronic state of the active center, strengthening the strong metal-support interaction (SMSI), and improving the activity of the catalyst. After ten cycles of use, the performance of the catalyst stabilized and the hydrogen selectivity was still as high as 100%.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Jihong Jiang,Yanchun Miao,Han Wang,Xiaobin Dong,Yali Li,Junlin Lin,Zeyu Lu
Regardless of how good pre-dispersion of nano-TiO 2 in aqueous solutions, re-aggregation rapidly occurs once it is mixed into fresh cement mixtures, limiting the nano-reinforcing efficiency for cement-based materials. In this study, an in-situ release strategy by pre-encapsulating nano-TiO 2 in microscaled ice and post-dispersing into fresh cement matrix during ice-melting process was developed to highly reinforce the microstructure and properties of cement paste. Compared with the conventional dispersion strategy, a much better dispersion of nano-TiO 2 (0.6 wt% by cement) was achieved using the in-situ release strategy, which not only improved the 7- and 28-day compressive strength of cement paste by 9.2% and 10.1%, respectively, but also reduced the cement hydration heat and water adsorption by 36.1% and 4.6%, respectively. In addition to this, the NO degradation efficiency of cement paste was also improved by 20% due to the larger exposed surface area of nano-TiO 2 with better dispersion. These research outcomes demonstrate that the in-situ release strategy facilitates the dispersion of nano-TiO 2 in cement matrix and contributes to highly reinforcing cement paste with lower hydration heat and water adsorption, strong mechanical strength and higher photocatalytic properties.
研究领域:
土木工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 18
·11938-11947
·
IF 3.9
Yu Liang,Wanrui Gui,Zhihong Yang,Kang Cheng,Xin Zhou,Can Yang,Jianmei Xu,Wei Zhou
Designing organic–inorganic hybrid semiconductors is an effective strategy for improving the performance of the photocatalyst under visible light irradiation. In this experiment, we firstly introduced Cu into perylenediimide supramolecules (PDIsm) to prepare the novel Cu-dopped PDIsm (CuPDIsm) with one-dimensional structure and then incorporated CuPDIsm with TiO2 to improve the photocatalytic performance. The introduction of Cu in PDIsm increases both the visible light adsorption and specific surface areas. Cu2+ coordination link between adjacent perylenediimide (PDI) moleculars and H-type π–π stacking of the aromatic core greatly accelerate the electron transfer in CuPDIsm system. Moreover, the photo-induced electrons generated by CuPDIsm migrate to TiO2 nanoparticles through hydrogen bond and electronic coupling at the TiO2/CuPDIsm heterojunction, which further accelerates the electron transfer and the separation efficiency of the charge carriers. So, the TiO2/CuPDIsm composites exhibit excellent photodegradation activity under visible light irradiation, reaching the maximum values of 89.87 and 97.26% toward tetracycline and methylene blue, respectively. This study provides new prospects for the development of metal-dopping organic systems and the construction of inorganic–organic heterojunctions, which can effectively enhance the electron transfer and improve the photocatalytic performance.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Nanomedicine
·
2025
·
IF 6.5
Zhiyu Zheng,Gareth R Williams,Honghua Guo,Yilu Zheng,Mengting Xiu,Yanyan Zhang,Huan Zhang,Kai Wang,Jindong Xia,Yu Wang,Li-Min Zhu
Purpose Owing to the limitations of single-mode cancer treatments, combination therapies have attracted much attention. However, constructing a platform for combination therapies in a simple and effective way and improving the overall treatment effect remains a challenge. Our aim was to combine sonodynamic therapy, radiotherapy and chemotherapy together and improve therapeutic outcomes within one nanoplatform.Methods In this work, we sought to exploit the properties of nanoscale heterojunctions to this end. A multifunctional Bi2O3-TiO2@polydopamine-doxorubicin (BTPD) nanoparticle platform was constructed as an anti-cancer theranostic. Under ultrasound irradiation, the Bi2O3-TiO2 core can generate singlet oxygen to damage tumor cells. Meanwhile, the high-Z Bi2O3 can attenuate the energy of X-rays and scatter secondary electrons to enhance radiation damage in the tumor. A thin coating of polydopamine (PDA) increases the biocompatibility but also gives the particles the ability for photoacoustic imaging. Doxorubicin, a DNA repair inhibitor which can hinder tumor recovery from radiation damage, was loaded onto the PDA.Results A comprehensive series of in vitro and in vivo assays demonstrated that the nanoparticles were effectively taken up into cancer cells, where they could induce ROS production and cause cell death. In vivo, this led to a marked reduction in tumor volume in a murine 4T1 cancer model.Conclusion The formulations developed here have significant potential for future investigation and exploration in the treatment of cancer.
研究领域:
肿瘤学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 10
·6325-6334
·
IF 12.732
Peng Zhou,Shuhua Wang,Guangyao Zhai,Xingshuai Lv,Yuanyuan Liu,Zeyan Wang,Peng Wang,Zhaoke Zheng,Hefeng Cheng,Ying Dai,Baibiao Huang
Ni/TiO2 as a classic system has been widely studied in the traditional catalysis field including the water-gas shift reaction and selective oxidation/hydrogenation. However, in terms of the electrocatalytic hydrogen evolution reaction (HER), there is still a lack of systematic research on the actual synergistic promotion effect on the performance, and the influence of the host material on the electronic interaction between Ni and TiO2 is still unclear. Herein, we synthesized a series of Ni/TiO2 composites with different forms and tested the relevant HER performance. The results show that Ni/TiO2 exhibits much better HER performance than pure Ni and there is one type of electronic interaction between Ni and TiO2 in the composite with different forms, that is, electrons transfer from Ni to TiO2. However, the interaction strength is host dependent, and the composite with Ni as the host displays the strongest interaction, and therefore the best HER performance (46 mV at 10 mA cm−2).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 11
·827
·
IF 3.8
Yumeng Song,Ping Chen,Hui Lou,Xiaoming Zheng,Xiangen Song
In this work, the highly efficient hydrogenation of guaiacol catalyzed by ruthenium supported on Al2O3-TiO2(Ru/Al2Ti1) at very mild conditions was carried out. At temperatures as low as 25 °C and 2 MPa H2, about 60% of guaiacol could be converted to 2-methoxycyclohexanol (MCH) with a selectivity as high as 94% on the Ru/Al2Ti1catalyst with an appropriate hydrogen pressure. At temperatures above 50 °C, almost all of the guaiacol could be converted with the catalyst of Ru/Al2Ti1, mainly into hydrogenated products such as MCH. The surprisingly efficient hydrogenation of guaiacol at low temperatures was most likely due to the ability of Ru particles loaded on the specific complex metal oxide carriers, particularly the reduction of the edge effect of Ru, to activate phenyl and hydrogen and reduce the competition of the dimethoxy process. These findings about the high activity of the Ru/Al2Ti1catalyst at nearly room temperature may be helpful to upgrading the industrial process of the pyrolysis bio-oils.
研究领域:
催化化学
·
可再生能源
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2015
·
IF 1.173
Lu Mao,Jiaojun Shen,Xiaoliang Ma,Zhonghui Lan,Xu Zhang
Photocatalytic degradation of 2,4-dinitrophenol in two commercial TiO2 (Degussa P25 and Hombikat UV-100) was investigated in this work. The properties of two TiO2 were systematically studied and described in detail. The observed photoactivity of Degussa P25 was 6–12 times higher than Hombikat UV-100 although the specific surface area of Hombikat UV-100 was 5.7 times more than that of Degussa P25. The photodegradation of 2,4-dinitrophenol was favored at neutral pH in Degussa P25, while its degradation was preferred at pH 3.0 in Hombikat UV-100 dispersion. The observed kinetic constant (kobs) for the photodegradation of 2,4-dinitrophenol in 20 mg/L humic acid solution was found to be 15% (Degussa P25) and 21% (Hombikat UV-100) of the values obtained from the corresponding pure aquatic solutions. The suppression effects of β-cyclodextrin on the photodegradation of 2,4-dinitrophenol over Degussa P25 (50%) was much more significant than that of Hombikat UV-100 because of the different adsorption behavior of β-cyclodextrin over two TiO2. Hydroxyl radical and valance band hole was found to be the predominant reactant during the degradation of 2,4-dinitrophenol using P25 and UV-100, respectively. Formic acid, acetic acid, oxalic acid, and were detected as advanced oxidation products.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）