Desalination and Water Treatment
·
2024
·
IF 1
Lihuan Mo,Peiqi Lyu,Zhen Yang,Jie Gong,Kai Liu,Jun Li
Bagasse pulp wastewater has restricted and disturbed the bagasse pulp industry all the time. In this paper, photocatalytic oxidation technology (O 3 +UV+TiO 2 ) was applied to bagasse pulp wastewater treatment. TiO 2 was prepared into a composite photocatalyst (La-TiO 2 /Al 2 O 3 ) to improve the treatment effect. p-Chlorophenol was chosen as a target compound to evaluate the catalytic activity and study the preparation process of La-TiO 2 /Al 2 O 3 . La-TiO 2 /Al 2 O 3 was finally used in the treatment of real bagasse pulp wastewater with photocatalytic oxidation technology. Under an optimum experiment conditions, chemical oxygen demand (COD) and total organic carbon removal rate of bagasse pulp wastewater reached 80.2% and 77.1%, respectively, and AOX dropped to 2.9 mg/L. Most organic pollutants in the wastewater had been removed. Additionally, in the reusability study, COD removal was maintained at 70.5% at 7th reuse. These findings of present study revealed that La-TiO 2 /Al 2 O 3 held great potential in the practical photocatalytic degradation application of industrial organic wastewater.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2020
·
IF 1.724
Feng Zhou,Xianghong Ren
1,1-Dimethylhydrazine (UDMH) and its by-products were considered carcinogenic toxins and represent a serious health hazard to the population once present in water under natural conditions without treatment. The conventional degradation method suffers from incomplete removal of intermediate products (especially N-nitrosodimethylamine (NDMA)), the powdery catalysis being difficult to recover and results in high energy consumption. In this study, a series of Bi2O3/TiO2/Al2O3 (BTA) photocatalysts have been successfully synthesized by a simple dry mixing method with powder material followed by their immobilization. It was evaluated by the photocatalytic degradation of UDMH present in wastewater, which can be recovered by rapid filtration and utilizes only solar energy. The catalyst exhibited markedly enhanced photocatalytic activity for the degradation of UDMH wastewater compared with conventional TiO2/Al2O3 (TA) catalysts under UV, visible and solar irradiation. Besides, the intermediate NDMA was gradually completely degraded. The photocatalysts were extensively characterized using scanning electron microscopy, energy dispersive spectrometry, specific surface area (BET), X-ray diffraction, X-ray photoelectron spectroscopy, UV–visible diffuse reflectance spectroscopy and photo-electrochemical I–t curves evaluation. The results revealed that all the BTA composites exhibited high stability and stronger absorbance in visible light. In addition, the BTA exhibited a reversible photochromic property that can effectively expand the range of light absorption and enhance the photocatalytic activity. The reversible photochromic properties of BTA explained in the proposed mechanism model are expected to be useful for detecting and sensing UDMH or other organic contaminants.
研究领域:
环境科学
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催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Wenwu Zhou,Li Yang,Lang Liu,Zhiping Chen,Anning Zhou,Yating Zhang,Xinfu He,Faxiang Shi,Zegao Zhao
Highly ordered mesoporous TiO 2 -Al 2 O 3 composites with different TiO 2 mass contents (MA-xTi) were successfully synthesized via an improved solvent evaporation-induced self-assembly method and the corresponding NiMo supported hydrodesulfurization (HDS) catalysts were prepared via wetness incipient co-impregnation method. The materials were characterized by means of XRD, ICP-OES, N 2 physical adsorption-desorption, SEM, TEM, Py-FTIR, H 2 -TPR, HRTEM and XPS and the catalytic activities for 4,6-dimethyldibenzothiophene (4,6-DMDBT) HDS over the prepared NiMo/MA-xTi series catalysts were investigated. The results show that the crystal forms, crystal morphologies, pore structures, pore arrangements and acidity properties of the MA-xTi samples varied with the incorporation and increase of TiO 2 species; the interaction between the active metals and the support materials (MSI) can be modulated by the incorporation of TiO 2 species, and TiO 2 incorporation also can promote the formation of the so-called “Type II” NiMoS active phase via changing the morphology of Ni promoted MoS 2 slabs, promoting the sulfidation of both Ni and Mo species and enhancing the proportion of NiMoS phase. The catalytic evaluation results show that the enhancement in the overall HDS activity of the NiMo/MA-xTi series catalysts were mainly contributed by the enhancement in the hydrogenation desulfurization (HYDS) activity. Catalyst NiMo/MA-20Ti exhibited the superior catalytic performance due to its highly ordered mesopore arrangement, proper acidity, moderate MSI, moderate stacking and high proportion of NiMoS phase which leads to more highly active “Type II” active sites.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 29
·15217-15226
·
IF 8.867
Zhongbin Pan,Jiwei Zhai,Bo Shen
Polymer nanocomposites with high energy density have potential applications in advanced electronics and electric power systems. The inevitable electrical mismatch between nanofillers and the polymer matrix could compromise the energy storage capability and dielectric properties of the polymer nanocomposites. Herein, novel core–double-shell structured BaTiO3@TiO2@Al2O3 nanofibers (BT@TO@AO NFs) were prepared via a one step method, and were incorporated into poly(vinylidene fluoride) (PVDF). The novel design of gradually varying the multilayer hierarchical interface was advantageous to alleviating the local electric field and electric current density intensification in the filler/polymer system. As compared with the nanocomposites loaded with BT NFs and BT@TO NFs, the nanocomposites filled with BT@TO@AO NFs exhibit much decreased dielectric loss, enhanced breakdown strength, and suppressed leakage current densities. Simulations were carried out to verify that the new core–double-shell structure significantly enhances the breakdown strength and energy density. As a result, the nanocomposite films loaded with 3.6 vol% BT@TO@AO NFs show a maximum energy storage density (Ue) of 14.84 J cm−3 at 450 MV m−1, which is about twelve times greater than that of biaxially oriented polypropylene (BOPP) (≈1.2 J cm−3 at 640 MV m−1). Moreover, the nanocomposite exhibits a superior power density of 4.7 MW cm−3 and an ultra-fast discharge speed of 0.37 μs. This research opens up a convenient and effective way for designing high-performance dielectric polymer nanocomposites.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Dawei Zhang,Gang Wang,Shudi Zhi,Kaile Xu,Lijing Zhu,Wenwei Li,Zhixiang Zeng,Qunji Xue
To improve the separation efficiency and decrease fouling of the membranes used in oil-in-water emulsions separation, a superhydrophilic and underwater superoleophobic TiO 2 /Al 2 O 3 composite membrane with ultra low oil adhesion was designed. TiO 2 nanorod arrays were prepared on Al 2 O 3 porous ceramic membrane surface by simple magnetron sputtering and hydrothermal oxidation. The microstructure and surface photosensitivity of TiO 2 nanorod array-coated ceramic membrane can effectively increase the efficiency of oil-water separation and reduce the degree of surface fouling. The layer of TiO 2 nanorod arrays not only reduced the pore size of traditional ceramic membrane (enhanced sieving effect of porous structures) but also endowed its superhydrophilicity (enhanced flux) and underwater superoleophobicity (enhanced oil/water selectivity and antifouling). Based on the superhydrophilicity (water contact angle (WCA) of 0°) and underwater superoleophobicity (oil contact angle (OCA) higher than 150°) of ceramic membrane, oil droplets were blocked by the membrane (oil-water separation efficiency 99.1% under gravity) and water will pass (flux is maintained at 41.8 L/(m 2 h) under gravity). It also has excellent anti-fouling ability due to the ultra-low oil adhesion force (0.084 mN) of the TiO 2 nanorod array-coating after UV irradiation. These features, combined with energy-saving, low-cost and easy-to-scale manufacturing schemes will be of great versatility and practicality in environmental rehabilitation and wastewater purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2022
·
IF 8.321
Yutong Shen,Jun Xiao,Qijing Wu,Jingting Su,Li Zhu
To improve the conversion efficiency and reduce the CO 2 emissions associated with the reforming of biomass tar to syngas, photothermal catalysts were prepared in this study through various impregnation methods. Photothermocatalytic CO 2 reforming (PTCR) of benzene as a tar model compound, was conducted using the prepared Ni/TiO 2 -Al 2 O 3 catalysts. The results show that the introduction of TiO 2 facilitates the conversion of NiO to Ni during the photothermal reaction, while the photocatalysis of TiO 2 significantly enhances the photothermocatalytic activity of the Ni/Al 2 O 3 catalysts at low temperatures. Moreover, the methodology for catalyst preparation involving the loading of NiO before TiO 2 is also beneficial to catalyst performance. However, when the mass ratio of TiO 2 to Al 2 O 3 exceeds 1, the specific surface area, pore volume, and structural stability of the catalysts are reduced. The results of PTCR experiment show the following optimal Ni/TiO 2 -Al 2 O 3 catalyst preparation parameters: 25% NiO content and a TiO 2 /Al 2 O 3 ratio of 3:7; 450 °C calcination temperature and a nitrogen atmosphere. The maximum benzene conversion achieved through PTCR with the 0.25Ni/0.3Ti0.7Al(M2) catalyst is 88.2%. However, a large amount of coke is deposited onto the spent catalyst surface, contributing significantly to catalyst deactivation.
研究领域:
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Wenqin Zhao,Zonghao Zhang,Bo Wang,Yang Lv,Lei Huang,Pingle Liu
Catalytic hydrodeoxygenation is a plausible route to upgrade the quality of biomass energy sources. Herein, a series of Ru-Co alloy catalysts (Ru-Co/TiO 2 -Al 2 O 3 ) were prepared and applied in guaiacol hydrodeoxygenation to cyclohexanol. It was found that Ru-Co nanoparticles with average size of about 8.67 nm were uniformly dispersed on TiO 2 -Al 2 O 3 support. It was verified that Co doping led to the formation of electron-rich Ru and hence promoted the desorption of active hydrogen, while the constructed TiO 2 -Al 2 O 3 support possessed abundant oxygen vacancies and acidic sites, which facilitated adsorption and hydrogenolysis of −OCH 3 functional group. 5Ru-5Co/TiO 2 -Al 2 O 3 catalyst gives the best catalytic performance of >99% guaiacol conversion and 94% selectivity to cyclohexanol. In addition, the strong interactions between Ru-Co nanoparticles and TiO 2 -Al 2 O 3 could significantly inhibit aggregation and leaching of Ru-Co nanoparticles during the reaction. The research results will provide reference to design highly efficient and stable bimetallic catalysts in converting lignin-derived bio-oils.
研究领域:
催化化学
·
生物质能
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2015
·
IF 10.325
Kun Cao,Zhixiang Zuo,Jin Cui,Yan Shen,Thomas Moehl,Shaik M. Zakeeruddin,Michael Grätzel,Mingkui Wang
We present efficient perovskite solar cells using a mesoscopic TiO 2 /Al 2 O 3 /NiO/carbon structure as framework. The CH 3 NH 3 PbI 3 -based device with quadruple-layer architecture achieves a power conversion efficiency of 15.03% under AM 1.5G illumination. Detailed investigations show an increased charge collection and reduced charge recombination in this device structure compared to that without NiO interlayer. It is found that these perovskite solar cells exhibit good stability both in dark and under illumination.
研究领域:
光伏技术
·
材料科学
·
可再生能源
·
纳米技术
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2017
·
IF 4.018
Shuangshuang Liu,Kun Cao,Hao Li,Jinkui Song,Junbo Han,Yan Shen,Mingkui Wang
In this research work, for the first time, we introduced thin composite films (∼1.8 μm) made with NiO nanoparticles and single-walled carbon nanotubes (SWCNT) as alternatives to replace the commonly used carbon black/graphite counter electrode in full printable organic hole-transport layer free mesoporous perovskite solar cells. Due to the relative thick carbon black/graphite counter electrodes, which are typically ∼10 μm thick, charge collection and batch to batch reproducibility of this type devices are significantly limited. We find an appreciated power conversion efficiency of 12.7% can be achieved for the CH 3 NH 3 PbI 3 perovskite solar cell using mesoscopic TiO 2 /Al 2 O 3 framework structure in combination with a thin NiO/SWCNT counter electrode under standard reporting conditions. Electronic impedance spectroscopy measurements reveal efficient charge collection ability for perovskite devices using thin NiO/SWCNT counter electrodes compared to the conventional carbon black/graphite counter electrode, and thus can efficiently deliver photocurrent.
研究领域:
光伏技术
·
材料科学
·
纳米技术
·
可再生能源
·
太阳能电池
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 5
·1-14
·
IF 6.048
Li Yuchen,Chen Zhen,Zhang Xiangyu,Yang Kun,Wang Lidong,Li Junhua
As a promising option to provide gaseous NH 3 for SCR system, catalytic urea hydrolysis has aroused great attention, and improving surface area and activity of catalysis are the crucial issues to be solved for efficient urea hydrolysis. Therefore, a composite metal oxide (TiO 2 @Al 2 O 3 ) catalyst was prepared by a simple hydrothermal method, with mesoporous alumina (γ-Al 2 O 3 ) as substrate. The results verify the mesoporous structure and submicron cluster of TiO 2 @Al 2 O 3 , with exposed crystal faces of (101) and (400) for TiO 2 and γ-Al 2 O 3 , respectively. The electronegativity difference of Ti 4+ and Al 3+ changes the charge distribution scheme around the interface, which provides abundant acid/base sites to boost the urea hydrolysis. Consequently, for an optimal proportioning with nano TiO 2 content at 10 wt.%, the hydrolysis efficiency can reach up to 35.2 % at 100 °C in 2 h, increasing by ∼7.1 % than that of the blank experiment. 13 C NMR spectrum measurements provide the impossible intermediate species during urea hydrolysis. Theoretical calculations are performed to clarify the efficient H 2 O decomposition at the interface of TiO 2 @Al 2 O 3 . The result offers a favorable technology for energy-efficiency urea hydrolysis.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Shiyi Wang,Hongdan Wu,Tongshu Chai,Zhihui Zhou,Lu Xia,Rongxue Li,Yuqing Sun
γ-Al 2 O 3 ceramic nanofiltration (NF) membranes are promising for water treatment owing to their excellent thermal and chemical durability; however, their widespread application is restricted by low water permeance, severe membrane fouling, and insufficient stability under acidic conditions. Herein, hydrophilic TiO 2 @Al 2 O 3 NF membranes were fabricated via a controlled sol deposition strategy, in which polyvinyl alcohol (PVA) regulated sol penetration into the porous support to construct a defect-free separation layer with reduced transport resistance. Simultaneously, TiO 2 incorporation into the boehmite-derived network induced the formation of Ti–O–Al linkages, leading to enhanced membrane hydrophilicity and structural integrity. As a result, the optimized membrane exhibited a pure water permeance of 23.71 L m −2 h −1 ·bar −1 , corresponding to a 36.13% increase over the pristine Al 2 O 3 membrane, while maintaining high rejections of 91.50% for MgCl 2 and 88.28% for CaCl 2 via the synergistic effects of size sieving and Donnan exclusion. The membrane sustained MgCl 2 rejection above 90% over 48 h of continuous filtration at pH 4, demonstrating enhanced stability under moderately acidic conditions. Significantly improved antifouling performance was achieved, with approximately 1.6-fold higher flux recovery than the pristine membrane after 8 h of tetracycline fouling tests. The enhanced separation performance is attributed to the synergistic effects of reduced transport resistance, Ti–O–Al-mediated structural reinforcement, and the formation of a stable hydration layer that mitigates foulant adhesion. This work presents an effective strategy for engineering ceramic NF membranes with simultaneously enhanced permeance, antifouling capability, and operational stability under moderately acidic conditions, providing new insights into membrane design for water treatment.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2019
·
IF 3.774
Biqin Lin,Rongxuan Li,Riyang Shu,Chao Wang,Zhengqiu Yuan,Yong Liu,Ying Chen
Hydrodeoxygenation (HDO) is an indispensable and important reaction in the fuel production process. Generally, the catalysts for HDO contain metal or acidic active sites, and the co-existence of them can significantly promote the HDO performance. While the subtle interaction between metal and acidic active sites is still not very clear. Herein, a series of Ru-based catalysts with different supports were prepared by photochemical method to obtain both of the high Ru dispersion and the moderate acidity. Among the catalysts with various supports, Ru/TiO 2 –Al 2 O 3 showed the most efficient performance in the HDO process of phenolic compounds. Guaiacol was converted into cyclohexane with above 90% selectivity at 240 °C. Other typical phenolic compounds, including phenol, anisole, p -cresol, 1,2-dimethoxybenzene, benzofuran , eugenol and dibenzyl ether, were all transformed into the corresponding cycloalkanes with yield close to 100%. The synergistic effect between highly dispersed Ru and moderate acid site played the key role for the enhanced production of hydrocarbon fuels. Moreover, this catalytic system was also effective on the raw bio-oil upgradation for producing high yield of hydrocarbons and alkylphenols, which has the potential to be used as biofuels.
研究领域:
催化
·
化学工程
·
能源
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）