ACS Applied Polymer Materials
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2022
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IF 4.855
Zheng Zhang,Ting Li,Xuhui Zhang,Jing Huang,Bihua Xia,Jie Jiang,Mingqing Chen,Weifu Dong,Yang Wang
The increased demand for environmental protection and sustainable development has promoted the progress of renewable and biodegradable materials, especially in the field of packaging and agriculture. Such a status makes poly(butylene adipate-co-terephthalate) (PBAT) a kind of popular polyester material with an expanded utilization rate for its good mechanical properties and processability. However, a poor barrier property and light aging resistance are always the core issues during application. In order to overcome these shortcomings, Ti–dopamine (TiDA) nanoparticles were synthesized by hybridizing dopamine and a titanium precursor, resulting in a mixed phase of rutile and brookite, which was highly beneficial to light resistance. When TiDA was blended with PBAT at a low concentration (0.5–2.0 wt %), the PBAT composite films showed a great comprehensive performance. While maintaining good mechanical properties (tensile strength over 30 MPa and strain over 800%), the water vapor permeability was reduced by nearly 40%. The UV light of all wave bands could be blocked mostly by PBAT/TD composite films, which also had enhanced aging resistance, retaining over 20 MPa tensile strength and almost 100% strain after aging with UV radiation for 100 h. In summary, the PBAT/TD film material was promising for potential production in the field of agriculture and packaging.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Huachang Jin,Xuejiao Zhang,Yang Yu,Xueming Chen
The extensive evaporation-induced aggregation of scale inhibitors in the wastewater of recirculating cooling systems causes severe environmental pollution . In this study, Amino Trimethylene Phosphonic Acid (ATMP), an ordinary scale inhibitor, was degraded via electrochemical oxidation using a multi-layered Ti/IrO 2 -RhO x -TiO 2 /α-PbO 2 /β-PbO 2 electrode. The electrochemical oxidation experimental results verified the superior electro-catalytic properties of the β-PbO 2 electrode. Accelerated lifetime tests suggested that Ti/IrO 2 -RhO x -TiO 2 /α-PbO 2 /β-PbO 2 possesses a service lifetime of 201 h under a current density of 40000 A/m 2 , which is 3.4–100.5 times as long as other β-PbO 2 electrodes reported by other researchers. Four major operational parameters, namely electrolyte, current density, initial ATMP concentration, and pH, were discovered to significantly affect the ATMP degradation rate and electrical efficiency. The direct oxidation mechanism predominated in the degradation process of ATMP, achieving a 55.11% and 38.82% removal efficiency in Na 2 SO 4 and NaCl solutions, respectively. In addition, two possible degradation pathways of ATMP were proposed: induced by the breaking of either C-P or C-N bonds.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Wei Zhou,Minghe Cao,Hongye Wang,Hua Hao,Zhonghua Yao,Hanxing Liu
The miniaturization of electronic components requires materials with colossal permittivity. In this work, titanium-powder-doped TiO 2 ceramics with colossal permittivity and a low dielectric loss over a wide range of frequency and temperature were successfully prepared using a solid-state reaction in an Ar atmosphere. TiO 2 ceramics with 2% Ti powder doping had the highest permittivity (110,000) and the lowest dielectric loss (0.029) at 1 kHz and room temperature. Systematic defect analysis showed that Ti 4+ was successfully reduced to Ti 3+ through doping with Ti metal powder. Further, oxygen vacancies were created in the high-temperature inert atmosphere, which promoted the formation of defect clusters with T i 3 + − V o ″ − T i 3 + as the core. Polarization and local confinement of the defect clusters resulted in the colossal permittivity and low dielectric loss. Therefore, this work provides necessary information and novel ideas for the design of correlated defects in colossal permittivity materials.
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JOURNAL OF CHEMICAL RESEARCH
·
2022
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IF 1.097
Ying Wang,Fei Du,Chunyan Wang,Jiaqiang Zhao,Haizhu Sun,Chuanyin Sun
High-performance hierarchical cheese-like C-ZSM-5 nanocrystals are successfully prepared by acid–base treatment and are evaluated for oxidative desulfurization of dibenzothiophene. The acid–base treatment can generate a large number of Si-OH bonds and an open-mesoporous structure, which is conducive for the dispersion of TiO2 and also for the transport of dibenzothiophene and its oxidation products simultaneously. The catalytic results indicate that the hierarchical cheese-like C-ZSM-5 nanocrystals are highly active catalysts for the oxidative desulfurization of dibenzothiophene due to open mesoporosity. Complete conversion was obtained within 80 min at 338 K. The excellent performance is due to the large number of active framework sites and open mesopores generated by post-processing.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
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IF 7.312
Beibei Liu,Baoyu Gao,Kangying Guo,Jingwen Pan,Qinyan Yue
Safe and effective coagulants are necessary for surface water treatment. The polyaluminum-titanium chloride (PATC) composite coagulant has promise but its application is limited due to the lack of fundamental theoretical research. We prepared a series of novel PATCs and investigated the effects of the interaction between Al (III) and Ti (IV) on the chemical species distribution, physicochemical properties and coagulation efficiencies. The Al-O-Ti bonds observed in the PATC infrared spectra were predicted by density functional theory computation to appear in 4-atom rings in the structure. The differences in Al species distribution of PATC and PAC illustrated that the introduction of Ti retarded the hydrolysis of monomeric Al species (Al a ) and medium polymerized Al species (Al b ) to colloidal Al species (Al c ) at low B levels, but the transformation was promoted at high basicities (B). PATCs exhibited higher charge densities and larger molecular weights than PAC at the same B levels, which contributed to their excellent coagulation efficiencies. PATC with low B values but high Al/Ti molar ratios mainly provided charge neutralization in removal of humic acid kaolin, while the dominant coagulation mechanism converted from charge neutralization to sweeping and bridging effects at high B values or low Al/Ti molar ratios.
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Frontiers in Energy Research
·
2021
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IF 4.008
Li Jiayi,Zhou Wei,Huang Yuming,Gao Jihui
Replacing the oxygen evolution reaction (OER), which is of high energy consumption and slow kinetics, with the more thermodynamically favorable reaction at the anode can reduce the electricity consumption for hydrogen production. Here we developed a lignin-assisted water electrolysis (LAWE) process by using Ti/PbO2 with high OER overpotential as the anode aimed at decreasing the energy consumption for hydrogen production. The influence of key operating parameters such as temperature and lignin concentration on hydrogen production was analyzed. Compared with alkaline water electrolysis (AWE), the anode potential can be decreased from 0.773 to 0.303 (V vs. Hg/HgO) at 10 mA/cm2 in LAWE, and the corresponding cell voltage can be reduced by 546 mV. With increasing the temperature and lignin concentration, current density and H2 production rate were efficiently promoted. Furthermore, the anode deactivation was investigated by analyzing the linear sweep voltammetry (LSV) and cyclic voltammetry (CV) tests. Results showed that the anode deactivation was affected by the temperature.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2023
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IF 3.6
Mengxian Zhang,Xianrui Zhao,Junting Zhang,Zhigang Fang,Huan Xu,Hongtao Wang
TiB 2 reinforced Ti(C,N)-based cermet was produced by the reaction spark plasma sintering of Co, Ni, Ti, C, BN, Mo 2 C, WC, and TaC mixtures. To understand the mechanism of reaction sintering, systematic investigation on the microstructure evolution and displacement variation rule was carried out. In addition, the influence of C/BN molar ratio on the microstructures and performances of cermet was investigated. Except an initially increased pressure, three densification patterns were found. The first method was the Co Ti, Ti Ni, and Ti-BN diffusion reactions, resulting in a shrinkage of 22.06%. The second pattern was the viscous flow and dissolution-reprecipitation, which corresponded to the synthesis of Ti(C,N) and TiB 2 . In this process, the shrinkage ratio was increased by 35.62%. The final densification mainly originated from the viscous flow of metallic binder. It contributed to the transformation of macrovoids into microvoids, and an increased displacement of 30.10%. With the increasing of C/BN ratio, more C atoms diffused into Ti(C,N). Furthermore, core/rim structure-Ti(C,N) and coreless (W,Mo,Ta,Ti)(C,N) were fabricated. However, the microvoids in cermets enhanced. As a result, the hardness and fracture toughness first increased and then decreased. Results from this work are helpful to understand the reaction spark plasma sintering technique, and can enrich the preparation method of cermet.
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Water Resources and Industry
·
2023
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IF 5.1
Yonghao Zhang,Yating Song,Liu Liu,Jie Zhang,Zhaoyi Zhang,Qian Li,Jing Yang,Wen Li,Lulu Huang,Xue Li,Yulei Zhang,Qiangshun Wu,Xuejie Guo
In this study, porous Ti/Magnéli Ti 4 O 7 nanotube arrays (NTA) was fabricated to pretreat antibiotic wastewater. Characterization of the Ti 4 O 7 -NTA illustrated that highly ordered NTA was successfully generated on the porous Ti substrate, which enlarged the specific surface area by 1.67 times. The Ti 4 O 7 -NTA has a high oxygen evolution potential (2.60 V) as well as low interfacial charge transfer resistance (4.479 Ω cm −2 ). Ceftriaxone sodium (CRO) was completely removed from raw antibiotic wastewater after 3 h of treatment by the Ti 4 O 7 -NTA, under optimal operation conditions. The biodegradability and toxicity of the wastewater were also significantly enhanced and reduced, as the BOD/COD and EC 50,48h values were increased to 0.48 and 57.62 % ± 2.16 %, respectively. The possible degradation pathway of CRO was proposed by LC‒MS. Cathodic polarization was proven to be an effective way to ensure the long-term durability of the Ti 4 O 7 -NTA.
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Journal of Water Process Engineering
·
2023
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IF 7
Jiaqi Wei,Yuanyuan Zhang,Jinxing Ma,Shanshan Wang,Minmin Jiang,Qiaoyan Wei,Mei Chen,Xiaowu Huang,Haixiang Li,Xuehong Zhang,Junjian Zheng
Degradation of refractory organics has been limited by their low mass-transport rates in conventional flow-by operated electrochemical reactors. This study explores for the first time the development of porous titanium (Ti)-based metal oxide anodic membrane for efficient flow-through degradation of recalcitrant tetrabromobisphenol A (TBBPA). For this purpose, a duplexed Ti/SnO 2 -Sb/PbO 2 -Ce anodic membrane was successfully prepared by sol-gel and electrodeposition methods. Ti/SnO 2 -Sb/PbO 2 -Ce exhibited improved mechanical and electrochemical stability, larger electrochemical surface area, higher oxygen evolution potential and lower charge transfer resistance, as compared to its mono-layered rival (Ti/SnO 2 -Sb). The switching from flow-by to flow-through operation resulted in an increased mass transfer rate constant and narrowed diffusion layer thickness of Ti/SnO 2 -Sb/PbO 2 -Ce. In the flow-through mode, Ti/SnO 2 -Sb/PbO 2 -Ce enabled the complete TBBPA removal at a relatively low electric energy (0.11 kWh m −3 ). The TBBPA removal was ascribed to the direct anodic oxidation and indirect anodic oxidation incurred by absorbed HO , free HO and 1 O 2 . The intermediate products, which were arisen from the attack of TBBPA by these reactive species, were identified. We further estimated their acute toxicities and bioaccumulation factors. This research proposed a robust electrochemical filtration approach for detoxification of TBBPA-contaminated water.
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Nanomaterials
·
2023
·Vol. 13
·期 18
·2579
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IF 5.3
Yue Chang,Minmin Han,Yehui Ding,Huiyun Wei,Dawei Zhang,Hong Luo,Xiaogang Li,Xiongbo Yan
Effectively regulating and promoting the charge separation and transfer of photoanodes is a key and challenging aspect of photoelectrochemical (PEC) water oxidation. Herein, a Ti-doped hematite photoanode with a CoFe-LDH cocatalyst loaded on the surface was prepared through a series of processes, including hydrothermal treatment, annealing and electrodeposition. The prepared CoFe-LDH/Ti:α-Fe2O3photoanode exhibited an outstanding photocurrent density of 3.06 mA/cm2at 1.23 VRHE, which is five times higher than that of α-Fe2O3alone. CoFe-LDH modification and Ti doping on hematite can boost the surface charge transfer efficiency, which is mainly attributed to the interface interaction between CoFe-LDH and Ti:α-Fe2O3. Furthermore, we investigated the role of Ti doping in enhancing the PEC performance of CoFe-LDH/Ti:α-Fe2O3. A series of characterizations and theoretical calculations revealed that, in addition to improving the electronic conductivity of the bulk material, Ti doping also further enhances the interface coupling of CoFe-LDH/α-Fe2O3and finely regulates the interfacial electronic structure. These changes promote the rapid extraction of holes from hematite and facilitate charge separation and transfer. The informative findings presented in this work provide valuable insights for the design and construction of hematite photoanodes, offering guidance for achieving excellent performance in photoelectrochemical (PEC) water oxidation.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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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.
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ACS Applied Energy Materials
·
2020
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IF 4.473
Fengkai Wu,Jiale Xie,Yue You,Zhengyu Zhao,Liuliu Wang,Xiaoying Chen,Pingping Yang,Yuelong Huang
The poor conductivity and sluggish kinetics of hematite (α-Fe2O3) limit its photoelectrochemical (PEC) performance. Herein, a cobalt metal–organic framework (Co-MOF) ultrathin overlayer is in situ-grown onto a Ti-doped hematite nanorod array via the chemical bath deposition. The optimal Co-MOF/Ti:Fe2O3 achieves a photocurrent density of 2.24 mA/cm2 at 1.23 V [vs reversible hydrogen electrode (RHE)], which is 2.4-folds that of pristine Fe2O3. When compared with the onset potential of Ti:Fe2O3, Co-MOF/Ti:Fe2O3 exhibits a cathodic shift of 310 mV. Co-MOF/Ti:Fe2O3 also shows a photocurrent density retention of 98.1% after the 6 h stability test. The improved PEC activity is mostly ascribed to the increased charge separation and surface charge injection. Ti doping increases the electron density in Fe2O3 and lowers the Fermi level (vs RHE), facilitating the charge transport in the bulk. The enhanced photovoltage and favorable distribution of surface states after Co-MOF modification and the catalytic/conductive properties of Co-MOF induce the enhanced charge separation/injection and the low onset potential.
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