SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yucheng Liu,Hantao Du,Xu Huang,Mingming Yin,Hongtao Liu,Haoran Sun,Lizhang Wang
The treatment of high-salinity organic wastewater (HSOW) poses severe challenges, with sulfate ions (SO 4 2− ) playing a critical role in electrocatalytic oxidation processes. In this study, a series of Ti/RuO 2 -MO x electrodes were fabricated by coating composite metal oxides onto titanium substrates, and the SO 4 2− -mediated electron transfer mechanism on the electrode surface was elucidated. We reveal that surface metal atoms form M O S electron channels with SO 4 2− , facilitating direct electron transfer for organic oxidation. The oxidation state of metal ions exerts a significant regulatory effect on electron transfer processes. Specifically, composite formation with metal oxides (i.e., Sn 4+ , Ce 4+ , Mn 4+ ) exhibiting valence state matching with Ru 4+ optimizes surface electron distribution, expands electron channels, and enhances SO 4 2− adsorption stability, thereby exerting a positive promotional effect on electron transfer. Conversely, composite systems involving metal oxides with significant valence state discrepancies from Ru 4+ (i.e., Cu 2+/3+ , Co 2+/3+ , Fe 2+/3+ ) disrupt surface electron distribution, shrink electron channels, and reduce SO 4 2− adsorption stability, leading to impaired charge transfer kinetics. Notably, via the SO 4 2− -mediated electron transfer process, the Ti/RuO 2 -SnO 2 electrode with outstanding electron transfer properties achieved ultra-low energy consumption (0.0022 kwh‧g −1 ) degradation of organic pollutants, with a carbon footprint of 0.68 kg CO 2 ‧m −3 . This study provides novel insights for the ultra-low energy treatment of HSOW.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhengkang Peng,Xun Gong,Zijian Zhou,Shiwei Dong,Wei Hu,Hanxiao Liu,Jingying Xu
The removal of naphthalene is important but deficient, so that the available V-W/Ti catalysts (1.0 wt% V 2 O 5 /TiO 2 ) were prepared for its efficient abatement in this work. Especially, influences of different existence status of vanadium species on naphthalene elimination were investigated via changing the pH value of precursor solution. With the increase of precursor solution acidity, more highly polymeric vanadium species were formed on the catalyst surface. The redox capability was enhanced markedly as a consequence of the stronger electron transfer between V/W and Ti that induced more surface active oxygen and V 5+ , whereas the catalytic activity was obviously boosted and almost 90 % conversion of naphthalene was achieved at 293 °C. Moreover, the weaker chemisorption between naphthalene and V-W/Ti catalyst allowed the deeper conversion to CO x . GC–MS manifested that naphthalene seemed to be an organic component that was difficult to be totally degraded. Naphthalene oxidation was in the following pathway of naphthalene → 1,4-naphthoquinone → phthalic anhydride → phthalates → benzene → benzoquinone → maleic anhydride → CO x /H 2 O. The opening of aromatic ring in phthalic anhydride and benzene ring in benzene were proven to be the rate-controlling step based on in-situ DRIFTS results. The key of naphthalene oxidation was the complete degradation of various intermediates.
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高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Yuan Liang,Shaoxiang Xu,Meihua Zhu,Jiamin Jiang,Jiao Zhang,Goubing Zhou,Na Hu,Xiangshu Chen,Hidetoshi Kita
In the absence of boric acid, the tubular Ti-MWW zeolite membranes are prepared with dual organic template agents and potassium carbonate by secondary hydrothermal synthesis. 12MR cage and 10 MR of the MWW zeolite topology structure is stabilized by TMAdaOH and HMI organic template agents, K + cations is a critical mineralization agent for preparing Ti-MWW zeolite membrane with bi-layer Ti-MWW zeolites layer in this work. Besides, ion-exchange could greatly improve the catalytic performance of the Ti-MWW zeolite membrane for phenol hydroxylation with H 2 O 2 , influences of ammonium salt, ion-exchange time and temperature on the micro-structure and catalytic performance are investigated. The upper network-like Ti-MWW zeolite layer could be dissolved and removed by ion-exchange with 0.5 M (NH 4 ) 2 SO 4 solution at 60 °C for 24 h, and the “lying” Ti-MWW zeolites layer is kept on the mullite support. On the other hand, ion-exchange could promote the transformation of hexacoordinated extra-framework titanium species to tetracoordinated state in the framework, part of K + cations of Ti-MWW zeolites are replaced with NH 4 + cations. Total flux and phenol conversion of the ion-exchanged Ti-MWW zeolite membrane are 14.89 kg·m −2 ·h −1 and 36.49 % for phenol hydroxylation by H 2 O 2 at 50 °C.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Min Chen,Can Wang,Yingcai Wang,Xiaoyang Meng,Zefang Chen,Weiqiu Zhang,George Tan
In this study, a novel Ti-enhanced nanotube arrays/SnO 2 -Sb electrode was prepared by the sol-gel method on enhanced TiO 2 nanotube arrays (ENTA). The characterization, degradation performance, oxidation mechanism and mass transfer impact of the novel electrode was investigated. Compared with the conventional Ti/SnO 2 -Sb electrode, our novel electrode has higher oxygen evolution potential and electrochemical stability, due to the fabrication of ENTA structure. Its application for the destruction of a common biocide of MIT (2-methyl-4-isothiazolin-3-one), the first-order rate constants were determined from 0.01 min −1 to 0.505 min −1 during the electrochemical process. The radical oxidation and non-radical oxidation of the MIT degradation contribution were quantitatively identified as 87.8% and 12.1%, respectively. Furthermore, the second-rate constant between hydroxyl radical and MIT was estimated at 3.72 × 10 9 M − 1 S − 1 . The mass transfer impact was investigated with a differential column batch reactor (DCBR) under the conditions of various electrode spacing and fluid velocities. It indicated that reducing the electrode spacing and increasing the fluid velocity would enhance the mass transfer process and increase the overall oxidation rate. Meanwhile, the EE/O decreased from 17.7 kWh m −3 to 9.7 kWh m −3 , and the mass transfer coefficients increased dramatically from 0.52 × 10 −6 m s −1 to 2.48 × 10 −6 m s −1 .
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Hao Liu,Xuan Ge,Qiaodan Hu,Fan Yang,Jianguo Li
La- and Nb-doped BaTi 2 O 5 (BT 2 ) spherical glasses were prepared by a containerless aerodynamic levitation method and their glass-forming regions were established. It is found that La-doping on the Ba-site (network-modifier) and Nb-doping on the Ti-site (network-former) show distinct difference in the glass-forming region: less than 10 % La can replace Ba whereas 40 % Nb can incorporate into BT 2 glass. The distinction in glass-forming ability induced by La- and Nb-doping is discussed mainly from the structural arrangement of the glass. Raman spectroscopy analysis shows that La-doping elongates the short Ti–O bonds in the distorted [TiO 5 ] polyhedra and thus relaxes the network. Nb-doping introduces [NbO 6 ] polyhedra into BT 2 and there exists a critical doping level (20 %), below which incorporation of Nb into BT 2 relaxes the [TiO n ] polyhedra by shortening the long Ti–O bond and above which [NbO 6 ] starts to participate in the network skeleton construction resulting in a dramatic change in the glass structure, which is supported by the dramatic change in the exothermic peak on the DTA curves. This work triggers the speculation that the network-modifiers in BT 2 glass possess a very important role in the structure of network-former skeleton than those in glasses based on traditional network-former oxides such as SiO 2 , GeO 2 and B 2 O 3 , which may provide a useful strategy for modifying the properties of these novel glasses by chemical doping.
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DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Bao Liu,Kexuan Lyu,Yongqiang Chen,Baozhong Ma,Chengyan Wang
Manganese electrodeposition experiments were performed in an anion-exchange membrane (AEM) electrolysis reactor using Ti/IrO 2 –RuO 2 –SiO 2 anode. The influence of Mn 2+ concentration, cathode current density (CCD), (NH 4 ) 2 SO 4 concentration, SeO 2 concentration and electrolysis time on the cell voltage (CV), cathode current efficiency (CE) and specific energy consumption (SEC) of manganese electrodeposition was investigated. The crystalline structure, chemical composition and morphology of the deposited manganese metal and the generated dark mass were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS) measurements. The obtained results reveal that the crystalline structure of the deposited manganese metal was α-Mn. The dark mass of MnOOH would be generated and precipitated on the surface of the cathode, inhibiting the electrodeposition of manganese metal when the operating condition was not well controlled. Considering the CE, SEC and environmental aspect, the operating condition of Mn 2+ concentration = 30 g L −1 , CCD = 350 A m −2 , (NH 4 ) 2 SO 4 concentration = 110 g L −1 and SeO 2 concentration = 0.03 g L −1 was regarded as the best condition for manganese electrodeposition. Under this condition, the CE was 78.3% and the SEC was 4346–4433 kW h t −1 after electrolyzing for 24 h. Compared with the traditional approach, the CE increased by about 10% and the SEC decreased by about 27%. In addition, the electrolytic manganese anode slime was not generated during the manganese electrodeposition process . This approach is recommended as it will reduce the energy consumption and the quantities of solid waste discharge of manganese electrodeposition.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhu Gao,Jiaxing Wang,Yaseen Muhammad,Yibo Zhang,Syed Jalil Shah,Yang Hu,Zhe Chu,Zhongxing Zhao,Zhenxia Zhao
High photo-catalytic activity and stable recycling performance under high humidity are main hindering factors in practical applications of metal organic frameworks (MOFs) for volatile organic compounds (VOCs) degradation. In-situ co-doping strategy of pyrrolic N/Zn was proposed to enhance surface charge separation and cycling stability of MIL-125(Ti) for degradation of vaporous acetaldehyde under highly humid conditions. Characterizations results show that pyrrolic N/Zn co-doped MIL-125(Ti) exhibited an integrated crystal structure and high surface area (1415 m 2 /g). The constructed Ti/Zn-N/O clusters narrowed band gap (from 3.40 to 1.85 eV) of MIL-125(Ti) and boosted electron conductivity. Also, it was proved to enhance surface alkalinity and hydrophobicity of MIL-125(Ti), which would strengthen MOFs selective adsorption towards CH 3 CHO and accelerated the transfer of degradation product CO 2 from catalytic active sites in MIL-125(Ti) under high humidity. As a result, synergistic effect of N/Zn co-doping exhibited an enhanced the ability of activating oxygen and H 2 O molecules into superoxide radical ( O 2 − ) and hydroxy radical ( OH), showing 10 times faster reaction kinetics for CH 3 CHO degradation under humid air compared to MIL-125(Ti). Moreover, co-dopant of N/Zn into MIL-125(Ti) has significantly promoted the recycling stability of MIL-125(Ti) under high humidity. According to the work, co-dopant elemental strategy to modify MOF surface can provide the synergistic effect for efficient degradation of aldehyde VOCs under humid conditions.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yarong Zhao,Dan Zhou,Tianjun Zhang,Yun Yang,Ke Zhan,Xinchao Liu,Hui Min,Xinhuan Lu,Renfeng Nie,Qinghua Xia
This work first reports high-efficiency epoxidation of large cycloalkenes (carbon number ≥ 7) with tert-butyl hydroperoxide (TBHP) over single-/double-/multi-unit-cell nanosheet-constructed hierarchical zeolite, which is synthesized by one-step hydrothermal crystallization using piperidine as the structure-directing agent of the microporous structure. The excellent catalytic property of the material is ascribed to its unique structural characteristic. Plenty of surface titanols or silanols on the surface of MWW nanosheets are beneficial for the formation of transition-state intermediates; a large number of intercrystalline mesopores in the shell of the material not only facilitate the formation of the intermediate for TBHP but also have nearly no hindrance for the diffusion and mass transfer of bulky cycloalkene to the above intermediates; the 12-MR side cups penetrating into the crystals from the external surface are exposed as much as possible to the reaction system because of the single-/double-/multi-unit-cell MWW nanosheet, serving as the primary reaction space for the epoxidation of bulky cyclic alkene and oxidants and providing enough space for the transition state of Ti–OOtBu and bulky cycloalkane. Moreover, an efficient calcination-free catalytic reaction–regeneration method is developed to overcome the challenge for the recyclability of microporous Ti-zeolite in the catalytic epoxidation of bulky cycloalkenes.
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高影响因子
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
·
2020
·Vol. 108
·期 11
·2190-2205
·
IF 3.525
Yulu Yang,Bailong Tao,Yi Gong,Rui Chen,Weihu Yang,Chuanchuan Lin,Maowen Chen,Lu Qin,Yile Jia,Kaiyong Cai
After bone tumor resection, the large bony deficits are commonly reconstructed with Ti-based metallic endoprosthesis, which provide immediate stable fixation and allow early ambulation and weight bearing. However, when used in osteosarcoma resection, Ti implant-relative infection and tumor recurrence were recognized as the two critical factors for implantation failure. Hence, in this work, a novel zinc oxide nanoparticle decorating with naringin was prepared and immobilized onto Ti substrate. The drugs delivery profiles proved that in the bacterial infection and Warburg effect of osteosarcoma-induced acidic condition, naringin and Zn 2+ can be released easily from the functional Ti substrate. The anti-osteosarcoma and antibacterial assay showed the delivered naringin and Zn 2+ can induce a remarkable increase of oxidative stress in bacteria ( Escherichia coli and Staphylococcus aureus ) and osteosarcoma (Saos-2 cells) by producing reactive oxygen species (ROS). Accumulation of ROS results in damage of bacterial biofilm and bacterial membrane, leading to the leakage of bacterial RNA and DNA. Meanwhile, the increase of ROS induces osteosarcoma cell apoptosis by activating ROS/extracellular signal-regulated kinase signaling pathway. Furthermore, in vitro cellular experiments, including cell viability, alkaline phosphatase activity, collagen secretion, extracellular matrix mineralization level, indicated that the functional Ti substrate exhibited great potential for osteoblasts proliferation and differentiation. Hence, this study provides a simple and promising strategy of developing multifunctional Ti-based implants for the reconstruction of large bony after osteosarcoma resection.
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yu Su,Rong Fan,Jiabao Li,Yangxi Liu,Ziyuan Zheng,Xin Zhou,Xiang Feng,Yibin Liu,Hui Zhao,Xiaobo Chen,Xingong Zhang,Chaohe Yang,Hao Yan
Oxidation of fatty alcohols to fatty acids is still challenging due to the sluggish activation of the C–H bond over Au supported on reducible oxides with a coordination-saturated structure. Herein, we constructed an efficient interfacial Auδ−–OV–Ti structure by tuning the crystal forms of TiO2. Compared with TiO2-rutile exposed by (110) and (111) crystal facets, TiO2-anatase can exploit the defect (101) crystal facet to obtain rich oxygen vacancies (OV), inducing electron migration from TiO2-anatase support to Au species to form electron-rich Auδ− species. Specifically, the synergistic catalytic effect between the OV–Ti and Auδ− species greatly enhances the adsorption of alcohol and thereby overcomes sluggish activation of the C–H bond caused by the electron pushing effect triggered by long carbon chains. Consequently, the Au/TiO2-anatase catalyst shows excellent isooctyl alcohol conversion (69.5%) and isocaprylic acid selectivity (67.9%) under base-free conditions. The catalytic system is further extended to the oxidation of other fatty alcohols to fatty acids with excellent catalytic performance.
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高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Zean Xie,Kemeng Song,Yu Ren,Liyu Hou,Runqi Hu,Jianmei Li,Qi Shi,Dong Li,Wencui Li,Xiaoqiang Fan,Lian Kong,Xia Xiao,Zhen Zhao
Recently, some traditional oxide supports, such as nano TiO2 and ZrO2 with high surface energy, have been found to be partially reduced to generate oxygen vacancies and coordinatively unsaturated metal (Mcu) cations as efficient active sites for nonoxidative propane dehydrogenation (PDH). However, the primary challenge in their industrial applications is rapid deactivation because of coke, over-reduction, and aggregation under the reaction conditions of high temperature and reducible atmosphere. Herein, we reported that cost-effective and environmentally friendly Zr-doped TiO2 (TixZr1) prepared by a simple coprecipitation method can be used as a highly efficient and stable catalyst for PDH. Ti3Zr1 exhibited the C3H6 formation rate [r(C3H6)] of 0.6 mmol g–1 min–1 at 550 °C, which was 17 times that of pure TiO2, and a deactivation constant (Kd) 2.8 times lower than that of commercial TiO2. Moderate Zr doping promotes the generation of surface active lattice oxygen, which can be reduced at a relatively low temperature to form oxygen vacancies and Ti(Zr)cu–O acid–base pairs as the active sites for PDH, and their number is in line with r(C3H6) of TixZr1 catalysts. With the increase of the Zr doping amount, the bulk crystal phase of TixZr gradually transforms from Zr-doped anatase TiO2 to TiZrO4 via Ti2ZrO6 with enhanced thermostability, which can inhibit over-reduction and aggregation of the nano-oxide.
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高影响因子
Catalysts
·
2023
·Vol. 13
·期 11
·1398
·
IF 3.9
Wei Qian,Yi Fang,Hui Liu,Yili Deng,Yingying Li,Yongzheng Zhang,Zenghui Diao,Mingyu Li
The environmental pollution caused by antibiotics is becoming more serious. In this study, the Mn/BiPO4/g-C3N4composite (Mn-BPC) and the Ti/g-C3N4/BiPO4composite (Ti-BPC) were prepared by hydrothermal reaction method and solvent method, respectively, and applied to the degradation of tetracycline (TC) in an aqueous environment. The XRD and HRTEM results showed that these materials had the crystalline rod-like structure of BiPO4and abundant carbon, nitrogen and carbon–oxygen surface functional groups. The degradation of TC by Ti-BPC and Mn-BPC were nearly 92% and 79%, respectively. The degradation processes of TC were well consistent with the pseudo-second-order kinetics model and R2values were closer to 1. The trapping experiment showed that electron holes (h+) were the main reactive species for the degradation of tetracycline, OH· and O2−also have certain effects. Also, the possible photocatalytic degradation mechanism of Ti-BPC and Mn-BPC composites was thereby proposed. TC was firstly adsorbed on the surface of catalysts, and subsequently degraded by reactive species such as h+, OH· and O2−generated under visible light excitation. This study shows that the Ti-BPC and Mn-BPC photocatalysts have great potential in antibiotic degradation and can provide new ideas for antibiotic removal in aqueous environments.Keywords:bismuth phosphate;graphite phase carbon nitride;tetracycline (TC)
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高影响因子
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