Arabian Journal of Chemistry
·
2023
·
IF 6
Zehu Wang,Zongqi Li,Ruiye Yan,Guangshuo Wang,Yanming Wang,Xiaoliang Zhang,Zhixiao Zhang
The polymer microspheres with hollow structure are of technological importance in the removal of pollutants because of the large specific surface area and low mass transfer resistance. In this work, we employ the Pickering emulsion polymerization stabilized with TiO 2 nanoparticles to build the molecularly imprinted polymers microspheres with hollow structure (H-MIPs) for the precise recognition of dibutyl phthalate (DBP), which would influence the biological reproductive system and endocrine system as a typical endocrine disrupting compound. The polymerization induced phase separation occurring within Pickering emulsion droplets plays a significant role in the formation of hollow structure. The morphology and structure of H-MIPs were observed via optical microscope and field emission scanning electron microscope, respectively. The results indicate that H-MIPs microspheres are of irregular spherical form with sunken surface and perfect hollow structure. The forming process of the hollow structure was analyzed in detail. Besides, the chemical structure and thermal stability of H-MIPs and H-NIPs were characterized by fourier transform infrared spectroscopy and thermal gravimetric analysis, respectively. The binding performance of H-MIPs and H-NIPs was investigated through a series of binding experiments, which consist of the binding kinetics, binding isotherm, selective test and reusability experiment. The results show that H-MIPs microspheres exhibit remarkable binding kinetics towards DBP, and the saturated adsorption time is not more than 30 min. Apart from the fast binding rate, H-MIPs also show considerable binding amount, accurate binding selectivity and good regenerability. The imprinting factor could reach to 2.56, and the binding amount towards DBP remains at a relatively high level within 3 cycles. The prepared H-MIPs microspheres have broad application prospects in environmental and analytical field involved DBP, and the study also offers an alternative method for the facile building of H-MIPs microspheres.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Lingling Zhang,Zhaoxi Zhang,Xi He,Lei Zheng,Shikun Cheng,Zifu Li
Engineered nanoparticle materials (ENMs) are widely and increasingly produced and employed in many sectors. The use of diverse ENMs potentially leads to the release of multiple ENMs into the environment. These ENMs after discharge will be end in wastewater treatment plant and present in sludge. This work investigated the effect of multi-ENMs systems of ZnO and TiO 2 on sludge anaerobic fermentation and the related toxicity mechanism. Results revealed that the toxicity of ZnO ENMs on anaerobic fermentation was reduced in the presence of TiO 2 ENMs. Investigation on the change of free Zn 2+ and reactive oxygen species ( OH and H 2 O 2 ) suggested that both of free Zn 2+ and ROS contributed to the toxicity mechanism. Zn 2+ decrease was the main reason for the reduced toxicity in multi-ENMs systems. ROS mainly led to the reduction of cell viability in anaerobic fermentation systems. The presence of TiO 2 in the multi-ENMs systems promoted the recovery of enzyme activity, cell viability and bacteria abundance.
研究领域:
环境科学
·
纳米技术
·
废水处理
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Qin Li,Tingting Zhao,Mei Li,Wenting Li,Bin Yang,Dongran Qin,Kangle Lv,Xian Wang,Lamei Wu,Xiaofeng Wu,Jie Sun
Pickering emulsion (PE) stabilized by semiconductors for photocatalysis applications has received growing endorsement over the last decade due to its high interfacial activity. However, since most semiconductors inherently possess a strongly hydrophilic or hydrophobic surface and are unable to stabilize PE microcapsules by themselves, pretreating the surface of semiconductor powder with foreign modifier was usually unavoidable and inconvenient before the PE construction. Even worse, the added modifier inevitably limited the contact between the semiconductor and the reactant during the photocatalysis process. Herein, an oil-in-water PE was successfully obtained in one step without pretratment of the semiconductor, where the dye-contained wastewater and insoluble organic matter acted as the water and oil phases, respectively, and the dye molecules in water could directly assist TiO 2 particles to become the stabilizer. The TiO 2 powder in the formed PE system exhibited markedly enhanced photoactivity for dye degradation over that in traditional non-emulsified systems, and the PE microcapsules could be easily recovered for reuse and withstand long-term irradiation without severe demulsification. This work not only highlights a convenient and promising approach to build Pickering emulsion as a novel photocatalytic system with extremely high efficiency and recyclability, but also provides a new way of thinking on how to simplify the PE construction to meet more requirement in future practical applications.
研究领域:
材料科学
·
环境科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Ronghua Liu,Lina Jin,Dan Lu,Gang Hu,Long He,Jun Shan
In this paper, inspired by the cubic bi-continuous gyroid structure self-assembled by block copolymers, we start with the application of a novel and more facile approach, compared to the tedious synthetic procedures of block copolymers, to prepare the bi-continuous phases structured nanocomposite electrolytes. The bi-continuous phase structure is composed of a hard phase of the electrospun poly vinylidene fluoride (PVDF) non-woven scaffold providing the mechanical support for the electrolyte membranes and another soft phase built up then by the infiltration of polyethylene oxide (PEO) electrolyte into the PVDF scaffold membrane to be the ionic conducting phase. Therefore, the nanocomposite polymer electrolytes of the bi-continuous phase structure are prepared with addition of the different amounts of TiO 2 nanoparticles into the PEO electrolyte (containing LiClO 4 ). The nanocomposite electrolyte membranes have systematically been characterized by scanning electron microscopy (SEM), differential scanning calorimeter (DSC), X-ray diffraction (XRD), and tensile test. The tensile results indicate that the infiltration of PEO phase into the PVDF scaffold can greatly improve the elongation of the electrolyte membrane at break, but the tensile strength of the electrolyte membrane is substantially dependent on the electrospun PVDF scaffold. The ionic conductivity measurements show that addition of TiO 2 nanoparticles with an appropriate amount of ca . 10 wt% enhances the ionic conductivity of the nanocomposite electrolytes to 7.60 × 10 −5 S cm −1 at 60 °C, compared to 8.33 × 10 −6 S cm −1 at 60 °C of the PEO–LiClO 4 electrolyte. The effect of TiO 2 nanoparticles on the enhancement of Li + ion conductivity has been investigated by attenuated total reflectance-Fourier transform infrared spectra (ATR-FTIR), and the results show that a competitive interaction between TiO 2 nanoparticles and Li + ions weakens to some extent the existing complexing action of ether-O…Li + , allowing Li + ions faster transfer. However, we have found by high-resolution transmission electron microscopy (HRTEM) that the real dispersion state of TiO 2 nanoparticles in the nanocomposite electrolytes is in the form of large aggregates instead of the individual primary nanoparticles, which would tremendously depress the surface effect of the individual nanoparticles and greatly impact on the enhancement of the ionic conductivity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Qiqian Gao,Xueyu Zhang,Lianfeng Duan,Xiaoju Li,Xuesong Li,Yue Yang,Qiang Yu,Wei Lü
Herein, a TiO 2 nanoparticle/nanorod composite architecture was suggested for improving performance of quantum dot sensitized solar cells (QDSSCs), which was fabricated on transparent conductive glass substrates (FTO) via hydrothermal method followed by spin-coating, and further used as photoanode of QDSSCs. Compared with the TiO 2 nanorod photoanode, the power conversion efficiency (PCE) of the QDSSCs with this architecture was obviously improved. The champion efficiency of 4.42% was achieved, showing a 33.5% enhancement in PCE. The improved PCE mainly resulted from the increase of J sc , which increased from 9.80 (nanorod architecture) to 15.48 mA/cm 2 (nanoparticle/nanorod composite architecture). The advantages of the composite structure photoanode consist in the superior light scattering capability, faster electron transport and increased photogenerated electron concentration.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 3
·370-376
·
IF 1.071
Wu Shuo,Yang Xinlan,Zhao Yanqiu
A biomolecule-free photoelectrochemical(PEC) probe(denoted as Ru-1) was designed, synthesized and coupled with TiO 2 nanoparticles(NPs) for the highly sensitive and selective PEC detection of Hg 2+ , a model analyte with hypertoxicity to both human health and ecosystem. The probe Ru-1 was designed with Ru(II) bipyridyl complex as the chromophore, thiocyanate ligand as the recognition unit, and carboxylate group as the linkage site to connect Ru-1 to TiO 2 nanoparticles. Under irradiation, Ru-1 shows strong affinity to TiO 2 and good photophysical properties of strong visible light absorption, slow electron-hole(e-h + ) recombination, and fast photoelectron injection to TiO 2 nanoparticles via the π -bridge of 4-(2,2′-bipyridin)-4-yl-thiophene moiety. However, the specific coordination of Hg 2+ with Ru-1 via the thiol moiety in the thiocyanate enlarges the band gap of the complex and reduces the photocurrent significantly. The synergistic interaction between TiO 2 nanoparticles and the Ru-1 complex led to a selective PEC sensing strategy for Hg 2+ detection. Detectable linear ranges from 10 −12 g/mL to 10 −7 g/mL and from 10 −7 g/mL to 10 −3 g/mL were obtained without the interference from possibly co-existed metal ions. The good analytical performances indicate the chemical probe based biomolecule-free PEC platform may offer a new route for the detection of biologically and environmentally important small molecules.
研究领域:
分析化学
·
环境科学
·
纳米技术
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Shengliang Wang,Haixu Chen,Zhijun Xu,Xiaoliang Wang,Zhengyu Tao,Lei Wang,Xiaoman Liu,Xin Huang
Cell surface engineering is an effective strategy to improve the tolerance of living cells against harsh environments as well as endow cells with various properties and functionalities, which they do not possess inherently. However, the research emphasis on single-cell surface engineering with the emergence of collective functionality is still rare. In this study, we encapsulate a single living cell with TiO2 nanoparticles (Degussa P25, composed of anatase and rutile crystallites) and conductive polymer polypyrrole (PPy). The driving force generated from the nanoparticles TiO2 and PPy could be utilized to manipulate cells that are more than a hundred times their own body size. Different collective behaviors of unicellular organisms can be achieved under various conditions. Especially, the engineered cells could be endowed with a swarming negative phototaxis migration under UV light in the presence of ferrocene methanol (MFc). Given that the collective behaviors of organismic swarms can greatly improve the adaptability and survivability compared to individual ones, we thus anticipate that such a studied technique could open up opportunities for the manipulation of the collective behaviors of unicellular organisms and have great potential in cell therapy as well as biosensors.
研究领域:
生物技术
·
纳米技术
·
细胞生物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 5
·456
·
IF 2.654
Lihui Xuan,Guangping Han,Dong Wang,Wanli Cheng,Xun Gao,Feng Chen,Qingde Li
Surface modification and characterization of titanium dioxide (TiO2) nanoparticles and their roles in thermal, mechanical, and accelerated aging behavior of foamed wheat straw fiber/polypropylene (PP) composites are investigated. To improve the dispersion of nanoparticles and increase the possible interactions between wheat straw fiber and the PP matrix, the surface of the TiO2nanoparticles was modified with ethenyltrimethoxy silane (A171), a silane coupling agent. The grafting of A171 on the TiO2nanoparticles’ surface was characterized by Fourier transform infrared spectroscopy (FTIR). The wheat straw fibers treated with A171 and modified TiO2nanoparticles were characterized by FTIR and thermogravimetric analysis (TGA). FTIR spectra confirmed that the organic functional groups of A171 were successfully grafted onto the TiO2nanoparticles and wheat straw fibers, and the modified TiO2nanoparticles were adsorbed onto the wheat straw fibers. Thermogravimetric analysis showed that a higher thermal stability of the wheat straw fiber was obtained with the modified TiO2nanoparticles. The flexural, tensile, and impact properties were improved. A higher ultraviolet (UV) stability of the samples treated with modified TiO2nanoparticles was exhibited by the study of the color change and loss in mechanical properties.Keywords:surface-modified TiO2nanoparticles;foamed wheat straw fiber/polypropylene composites;mechanical properties;thermostability;UV stability
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Heng Shi,Yi He,Yang Pan,Haihui Di,Guangyong Zeng,Lei Zhang,Chunli Zhang
Binding nanoparticles on complex structured materials surface is an important issue for nanotechnology, such as obtain an superwetting surface. To fabricate a highly nanoparticles decorated polymer membrane with superior surface wettability , a facile and environmentally method stills remains challenge. Taken advantage from the mussel-inspired method, we reported here that the TiO 2 nanoparticles were directly anchored on the surface of poly(vinylidene fluoride) (PVDF) membrane, making the intrinsic hydrophobic polymer membrane become hydrophilic, what's more, the mussel inspired method was modified by introducing a silane coupling agent KH550, the ability to bind nanoparticles was retained and the as-prepared membrane turn from a common hydrophilic state to superhydrophilic state. Besides, the as-prepared superhydrophilic PVDF membrane could be applied on the separation of various kinds of surfactant stabilized oil-in-water emulsion with an ultrahigh efficiency nearly 99% and also shows durable oil resistance and antifouling performance, thus make the membrane easily to recycle. In addition, due to the universality of dopamine, this surface modification method should also be applicable on other organic–inorganic hybrid materials.
研究领域:
材料科学
·
纳米技术
·
环境工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2017
·Vol. 8
·期 1
·1-7
·
IF 12.124
Lin Jin,Li Zhi,Kan Jian,Huang Shijun,Su Weiping,Li Yadong
Catalytic oxidative C–H bond functionalization reactions that proceed without requiring stoichiometric amounts of external oxidants or pre-functionalized oxidizing reagents could maximize the atom- and step-economy in chemical syntheses. However, such a transformation remains elusive. Here, we report that a photo-driven catalytic process enables decarboxylative C–H trifluoromethylation of (hetero)arenes with trifluoroacetic acid as a trifluoromethyl source in good yields in the presence of an external oxidant in far lower than stoichiometric amounts (for example, 0.2 equivalents of Na 2 S 2 O 8 ) using Rh-modified TiO 2 nanoparticles as a photocatalyst, in which H 2 release is an important driving force for the reaction. Our findings not only provide an approach to accessing valuable decarboxylative C–H trifluoromethylations via activation of abundant but inert trifluoroacetic acid towards oxidative decarboxylation and trifluoromethyl radical formation, but also demonstrate that a photo-driven catalytic process is a promising way to achieve external oxidant-free C–H functionalization reactions.
研究领域:
有机化学
·
催化
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 9
·9503-9519
·
IF 3.056
Xie Wanying,Li Ji,Sun Feiyun,Dong Wenyi
The influence of ultrasonication on membrane performance was investigated by two ultrasonication modes, direct and indirect ultrasonication as pretreatment, and simply improved PVDF-TiO 2 membranes’ performance was systematically compared. Ultrasound intensity of 100% and ultrasonication time ranged from 1 to 2 h positively affect membrane permeability. Characterization results manifested that membrane structure was eventually optimized with an even nano-TiO 2 dispersion by direct ultrasonication. Analysis of surface roughness reflected that PVDF-TiO 2 (MS-U2) surface morphological pattern was peak-valley structure that resisted fouling greatly. A good fitting of experimental result and Tansel’s simulation illustrated that anti-fouling ability was realized direct ultrasonication modified membrane. PVDF-TiO 2 (MS-U2) membrane showing the lowest | τ | reflecting the time required to reach a certain level of the fouling degree was the lowest. Relying upon modified Hermia’s model analysis, protein blockage within the membrane pore was one major fouling mechanism; surface blockage degree of PVDF-TiO 2 (MS-U2) was relative slight. Fouling mechanism analyzed by two models reflected that PVDF-TiO 2 (MS-U2) membrane exhibited a higher anti-protein fouling ability during cross-flow filtration process.
研究领域:
材料科学
·
环境工程
·
膜技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Jia Liu,Run-Tian Ma,Yan-Ping Shi
With the increasing demand for lipase inhibitors and new drugs used in the clinical treatment of obesity, it is of great significance to screen lipase inhibitors from traditional Chinese medicines (TCMs) via capillary electrophoresis. In this work, Fe 3 O 4 @TiO 2 nanoparticles was fabricated by solvothermal method and employed as an improved magnetic support to immobilize lipase through electrostatic interaction. By the method of transmission electron microscopy, fourier transform infrared spectroscopy and X-ray diffraction, the magnetic nanoparticles were characterized. The immobilized enzyme possessed advantages of a wider range for pH and temperature endurance, better storage stability and reusability. The kinetics performances of the immobilized lipase were studied. When p-Nitrophenyl palmitate (pNPP) was used as enzyme substrate, the Michaelis-Menten constant was calculated to be 2.51 mM and its inhibition constant for Orlistat was ascertained to be 13.41 μM. Ultimately, the established method was applied to lipase inhibitors screening from 6 Tibetan medicines with lipase inhibitory activity and Oxytropis falcate Bunge was screened out for its supreme lipase inhibitory activity. 11 compounds in the Oxytropis falcate Bunge were further screened, five compounds exhibited similar inhibitory activity to Orlistat, and one compound (kaempferol) presented better inhibitory activity than Orlistat, which is the most commonly used drugs to treat obesity in clinic. This work not only developed a method for new anti-obesity drugs discovery, but also provided inspiration for exploring new medicinal value of the TCMs.
研究领域:
药学
·
生物技术
·
中药学
·
药物发现
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）