SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xiao-lei Wang,Wei Qin,Li-xin Wang,Kong-yin Zhao,Hui-cai Wang,Hong-yu Liu,Jun-fu Wei
In order to recover dyes from textile wastewater, a self-supported carboxylated titanium dioxide/calcium alginate (TiO 2 -COOH/CaAlg) hydrogel nanofiltration membrane was prepared using TiO 2 -COOH as the reinforcing agent. The Scanning electron microscopy (SEM) and Energy dispersive X-ray (EDX) mapping scanning spectra were employed to characterize the distribution of TiO 2 -COOH nanoparticles on the membrane surface. The pore size distribution, zeta potential and mechanical performance of the membrane were evaluated. The rejections for single dye solutions, salt solutions and dye/salt mixture solutions were also examined. The results indicate that the TiO 2 -COOH nanoparticles are dispersed uniformly on the membrane surface. Compared to CaAlg membrane, the tensile strength of 20 wt% TiO 2 -COOH/CaAlg membrane is enhanced by 328%. At the operating pressure of 0.1 MPa, the rejection ratios of 20 wt% TiO 2 -COOH/CaAlg membrane for 100 mg/L Brilliant blue G250, Direct black 38 and Congo red are 98.4%, 96.8% and 95.9% respectively, and the permeate flux is about 14.1 L·m −2 ·h −1 . Meanwhile, this membrane possesses the low rejection ratios for inorganic salts (16.1%, 15.6%, 12.3% and 9.0% for MgSO 4 , Na 2 SO 4 , MgCl 2 and NaCl, respectively), excellent dye anti-fouling property and good stability in the long-term filtration for dye/salt mixture solution.
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Youchun Pan,Qijie Jin,Bingxu Lu,Yan Ding,Xin Xu,Yuesong Shen,Yanwei Zeng
MnCeO x /TiO 2 has been widely used in selective catalytic reduction (SCR) of NO x at low temperature. However, it is often poisoned in the presence of water vapor and sulfur dioxide . In this work, the promotion mechanism of Ba modification was investigated. Results show that the doped BaO reacts with CeO 2 and forms BaCeO 3 . This unique perovskite structure of BaCeO 3 significantly enhances NO oxidation and NH 3 activation of MnCeO x /TiO 2 catalyst so that the NO conversion and the resistances to SO 2 improve. It is found that Ba species obviously promotes the NO adsorption ability and improve the redox properties of MnCeO x /TiO 2 catalyst. While the acid properties of the catalyst are inhibited by Ba modification and among which Lewis acid sites are dominant for both MnCeO x /TiO 2 and MnCe(Ba)O x /TiO 2 catalysts. Furthermore, in situ DRIFT experiments reveal that the NO reduction upon MnCeO x /TiO 2 and MnCe(Ba)O x /TiO 2 catalysts follows both E-R and L-H mechanisms, in which L-H is preferred. Ba species enhances the formation of active nitrate species, which accelerates the NO reduction through L-H mechanism. It is interesting that although Ba species weakens the NH 3 adsorption, it induces the ammonia conversion to coordination ammonia, which in turn accelerates the catalytic reaction .
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Ying Tang,Rajarshi Roy,Zuhong Zhang,Yanchun Hu,Feng Yang,Chaochao Qin,Lulu Jiang,Hairui Liu
Adjusting the electron transport layer (ETL) is an effective method to improve the power conversion efficiency (PCE) of perovskite solar cells (PSCs) as well as suppress their hysteresis. In this study, we report that RbCl doping TiO 2 can enhance the crystallinity of perovskite and reduce hysteresis as well. As RbCl crystallite has a polyhedral structure and lattice parameters similar to those of the perovskite by calculation confirmed. According to the seed-mediated growth theory, seed-mediated perovskite formation results in a dense and uniform active layer with excellent crystallinity and low trap density, which can reduce the interfacial charge accumulation and carrier recombination. Consequently, the PSCs with the RbCl-doping ETL show remarkably enhanced performance (from 18.67% to 20.75%). Impressively, negligible hysteresis, high fill factor (FF, over 80%) can be observed for the perovskite with the modified ETL. This work is expected to provide a viable path to design a simple-processing ETL for efficient PSCs.
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Ting Tang,Guining Lu,Wenjing Wang,Rui Wang,Kaibo Huang,Zhiyuan Qiu,Xueqin Tao,Zhi Dang
In this study, the TiO 2 -mediated photocatalytic removal of organic phosphate esters (OPEs) under UV irradiation was investigated. In addition, the effects of selected inorganic ions and humic acid (HA) were examined. TCEP, TCPP, and TDCPP hardly undergo degradation via photolysis, and TiO 2 -mediated photocatalysis was confirmed to be effective for removing OPEs present in a water matrix. Inorganic ions (e.g., PO 4 3− , SO 4 2− , Cl − , and NO 3 − ) and HA inhibited the degradation of OPEs. Among these selected ions, PO 4 3− exhibited the strongest inhibition ability, followed by SO 4 2− and then Cl − and NO 3 − , and the inhibition effect increased with the ion concentration . The inhibition effect was caused by two main reasons: (1) Inorganic ions or HA served as ·OH scavengers and competed with OPEs for ·OH. (2) On account of the adsorption of inorganic ions and HA on TiO 2 , the available surface-active sites for OPEs decreased, followed by their oxidation with surface-bound ·OH. The ·OH concentrations were measured by electron spin resonance and the probe method, and it was positively correlated to the degradation rate of OPEs. This study emphasized the importance of inorganic species and HA on the photocatalytic degradation of OPEs and clarified the inhibition mechanism for the degradation of OPEs by the inorganic species or HA.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·6885-6893
·
IF 2.047
Song Angang,Cao Guoqin,Zhu Di,Zhao Baofeng,Fu Zhenya,Cao Shuaiqi,Wang Qingjie,Hu Junhua
Nb-doped TiO 2 (NTO) thin films were sputtered on glass substrate followed by a simple annealing process in air. The photoelectric cooperative optimization was discussed based on the structural, optical and electrical characteristics. The influence of oxygen flow during deposition on materials chemistry and performance was analyzed. Hall measurement showed a strong dependence of transparent conductivity on the oxygen flow. Oxygen vacancies are related to the phase transitions from the rutile to anatase TiO 2 during annealing. The chemical states of Nb, Ti and O before and after annealing were discussed. The achievement of optimized transparent conductivity was resultant from the fine-tuning of the doped chemistry and special interplay of dopants and host lattice. Graphical
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Chan Zheng,Jian Lin,Xiaoyi Song,Qingbao Gan,Xiaoying Lin
High emissions of hazardous pollutants into the environment potentially lead to water shortages. New cost-effective water-treatment techniques with high degradation efficiencies are therefore needed. Here, we design an “open-mouth,” hollow, TiO2-nanoparticle-shelled (OMHTNPS), light-induced-bubble-propelled microcleaner for efficiently degrading organic pollutants. OMHTNPS microcleaners with asymmetric structures can be obtained via a facile sol–gel method, with subsequent removal of carbon microspheres by a simple sintering process. The shells of the prepared OMHTNPS microcleaners mainly consist of 20 nm anatase–TiO2 nanoparticles. When exposed to UV light, the OMHNPS microcleaners moved rapidly because of the photocatalytic decomposition of H2O2. The propulsion mechanism was investigated in detail. The OMHNPS microcleaner velocity can be conveniently controlled by the UV irradiation intensity and H2O2 concentration. Light-triggered on/off motion of the prepared microcleaners was also demonstrated. The combination of photocatalysis, self-propulsion, and a specific hollow nanoparticle-shelled structure gave a rhodamine B removal rate of 98% in the first 10 min. This is approximately 11 and 3 times higher than those achieved with a static pattern and solid TiO2 microcleaners, respectively. Deposition of magnetic Fe3O4 particles enabled convenient recycling and reuse of the microcleaners. These novel OMHTNPS microcleaners show outstanding capabilities for the removal of organic pollutants with fast speed and confirm that high efficiency can be achieved through the structure design of the microcleaner. The strategy proposed here provides potential approaches to the large-scale fabrication of asymmetric micromotors and the design of versatile photocatalytic micromotors.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Weicheng Cui,Hongye Bai,Jianpeng Shang,Fagen Wang,Dongbo Xu,Jinrui Ding,Weiqiang Fan,Weidong Shi
Constructing the high-performance photoanode is critical to improve photoelectrochemical (PEC) efficiency, but it is still an inevitable challenge to rationally fabricate the organic-inorganic hybrid-photoanode system. For the first time, we report a novel hybrid-photoanode built from ultrathin NiFe-MOF and TiO 2 by a sacrifice template method. The in-situ etch of NiFe-layered double hydroxide (LDH) on the surface of TiO 2 has been successfully realized in the coordination environment, for creating coordinately unsaturated metal sites on NiFe-MOF. The coordinately unsaturated metal sites could significantly promote the water oxidation kinetic , compared with conventional electrode/electrolyte interface. The photocurrent density of the NiFe-MOF/TiO 2 has reached about 3.35 times of bare TiO 2 at 1.23 V (vs. RHE), and the incident photon to current conversion efficiency (IPCE) value has been improved up to 42% (at 390 nm). The significant augment of the charge injection ( η injection ) of 92.8% and charge separation ( η separation ) efficiency of 37.4% has also been exhibited. Moreover, NiFe-MOF/TiO 2 shows a long-term stability ( < 10% decay) after 4 h of continuous illumination. This work provided a novel and rational strategy about the integration of the inorganic semiconductor and organic MOF , which can provide a new insight into understanding MOF-based catalysts for PEC water splitting.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jinlei Xie,Yefeng Yang,Haiping He,Ding Cheng,Minmin Mao,Qinxu Jiang,Lixin Song,Jie Xiong
Heterostructured semiconductor nanostructures have provoked great interest in the areas of energy, environment and catalysis. Herein, we report a novel hierarchical Ag 3 PO 4 /TiO 2 heterostructure consisting of nearly spherical Ag 3 PO 4 particles firmly coupled on the surface of TiO 2 nanofibers (NFs). The construction of Ag 3 PO 4 /TiO 2 heterostructure with tailored morphologies, compositions and optical properties was simply achieved via a facile and green synthetic strategy involving the electrospinning and solution-based processes. Owing to the synergetic effects of the components, the resulting hybrid heterostructures exhibited much improved visible light photocatalytic performance, which could degrade the RhB dye completely in 7.5 min. In addition, the coupling of Ag 3 PO 4 particles with UV-light-sensitive TiO 2 NFs enabled full utilization of solar energy and less consumption of noble metals, significantly appealing for their practical use in new energy sources and environmental issues. The developed synthetic strategy was considered to be applicable for the rational design and construction of other heterostructured catalysts.
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·739-746
·
IF 3.591
Tao Wang,Xiqing Liu,Mei Liu,Runhua Liao,Hongquan Zhan,Xiaoxue Qi,Yongqing Wang,Yanju Huang
Black TiO2 and metal–organic frameworks (MOF) are great materials with light-harvesting ability, redox power and consequently catalytic activity. Here, the integration of MIL-100(Fe) with TiO2(B) composite was designed for photocatalytic application, which greatly promoted light-harvesting and charge transfer. As expected, the integrated TiO2(B)/MIL-100(Fe) composite showed high photocatalytic activity due to unique Fe–O–Ti bonds that were constructed, which acted as an electronic tunnel to reduce electronic transfer resistance between MIL-100(Fe) and TiO2(B). In addition, the presence of Fe–O clusters in MIL-100(Fe) can also promote the charge dissociation and improve catalytic activity via the Fe3+/Fe2+ redox cycle. This achievement would help us to understand and design charge transfer pathways in the integration of MOF/semiconductor photocatalysts.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Nan Zhou,Yufan Wu,Yiran Li,Jiankui Yang,Qing Zhou,Yuwei Guo,Mao Xia,Zhi Zhou
As an anode with ultrahigh capacity (4200 mAh g −1 ), silicon (Si) has inherent defects, such as drastic volume change (~300%) and poor conductivity. To cope with these problems, constructing a rigid shell (e.g. TiO 2 ) on the surface of Si particles is an effective method. Typically, monoclinic titanium dioxide (TiO 2 -B) has the more excellent electrochemical performance among the various crystalline of TiO 2 (anatase, rutile, etc.) for its open channel and characteristic pseudocapacitive effect. In addition, carbon nanotubes (CNTs) are good conductor of electricity. It is hopeful to increase the conductivity of the Si anode by adding CNTs . In this work, therefore, a Si@TiO 2 -B/CNTs composite is prepared by hydrothermal method. The composite exhibits superior electrochemical properties during the half-cell test (1184 mAh g −1 under 0.1 A g −1 at 200th cycles). Furthermore, the electrochemical kinetics of the materials were studied by cyclic voltammetry, which demonstrated that coating TiO 2 -B could increase the capacitive effects of the composite (68.75%).
✓ 已验证
DOI
高影响因子
Energy Technology
·
2020
·Vol. 8
·期 7
·2000215
·
IF 3.404
Hao Liu,Zhengping Li,Haiyan Sun,Qifang Lu
Iron titanate is of considerable interest as a potential anode material for electrochemical energy storage and conversion. Herein, a fiber-like Fe 2 TiO 5 –TiO 2 @graphene (rGO–FTO–TO) hybrid structure is rationally designed and delicately fabricated by anchoring reduced graphene oxide (rGO) nanosheets on Fe 2 TiO 5 –TiO 2 (FTO–TO) nanofibers. The effective wrapping of rGO nanosheets can greatly improve the electrical conductivity and reduce the volume expansion. When evaluated as an anode, the rGO–FTO–TO exhibits remarkable lithium storage properties in terms of high capacity, long-term cycling stability, and excellent rate capability. Moreover, there exists a strong electrostatic interaction between rGO nanosheets and FTO–TO nanofibers by the introduction of aminopropyltriethoxysilane to induce the immobilization of a positively charged NH 3 + group on the FTO–TO surface, promoting the bonding with negatively charged carboxylic acid ( COO − ) and hydroxyl ( OH) groups on the rGO. With strong electrostatic interaction, the rGO–FTO–TO exhibits appreciably enhanced initial capacity, elevated capacity retention, and high columbic efficiency compared with those of pristine FTO–TO nanofibers. This work provides a feasible strategy for fabricating a graphene-encapsulated FTO–TO fiber-like composite as a promising high-performance anode for lithium-ion batteries.
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Shengxin Cao,Xiaozhou Ye,Huiru Hu,Haoran Jin,Yun Wang,Jianfeng Ye
Mesoporous anatase TiO 2 sphere based materials has long been the focus of intensive research dealing with environmental-related issues due to their significant advantages in terms of structural isotropy, high surface area, structural stability, and low cost. However, in most cases, the employed mesoporous anatase spheres were comprised of nanocrystalline subunits with random crystalline orientations, which means that numerous grain boundaries exist in the sphere-shaped particles, suppressing their performance in various applications. Herein, by using mesocrystalline anatase submicrospheres that were synthesized via utilizing SO 4 2- ions to modulate the growth dynamics of anatase crystals in the green mixed solvents of PEG-400 and H 2 O as both template and reactant, novel sphere-shaped anatase mesocrystal/SrTiO 3 nanodot heterostructures were successfully produced. These spherical anatase mesocrystal/SrTiO 3 heterostructures exhibited noticeably enhanced activity toward reduction of hexavalent chromium (Cr VI ) under stimulated solar light irradiation, which was largely attributed to their favored adsorption of Cr VI , bolstered photogenerated charge carrier separation and well-preserved reduction capability due to the construction of a well-defined type-II heterojunction with tight interfacial contacts and strong interactions. This work will be useful for the designed fabrication of micro/nanostructured TiO 2 based photocatalysts with complex spherical morphologies for photocatalytic applications in environmental purification.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）