Soft Matter
·
2023
·Vol. 19
·期 29
·5459-5467
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IF 3.4
Yang Sui,Yi Cui,Peng Wei,Chuanbo Cong,Xiaoyu Meng,Hai-Mu Ye,Qiong Zhou
Considering the molar mass between entanglements to be an intrinsic property of ultra-high molecular weight polyethylene (UHMWPE), the number of entanglements per chain increases with increasing molar mass, correspondingly making the UHMWPE intractable. Herein, we dispersed TiO2 nanoparticles with different characteristics into UHMWPE solutions to disentangle the molecular chains. Compared with the UHMWPE pure solution, the viscosity of the mixture solution declines by 91.22%, and the critical overlap concentration increases from 1 wt% to 1.4 wt%. A rapid precipitation method was utilized to obtain UHMWPE and UHMWPE/TiO2 composites from the solutions. The melting index of UHMWPE/TiO2 is 68.85 mg, which is in sharp contrast to that of UHMWPE which is 0 mg. We characterized the microstructures of UHMWPE/TiO2 nanocomposites using TEM, SAXS, DMA, and DSC. Accordingly, this significant improvement in processability contributed to the reduction of entanglements and a schematic model was proposed to explain the mechanism by which nanoparticles disentangle molecular chains. Simultaneously, the composite demonstrated better mechanical properties than UHMWPE. In summary, we provide a strategy to promote the processability of UHMWPE without sacrificing its outstanding mechanical properties.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shuang Shu,Hongjun Wang,Xinyan Guo,Yan Wang,Xiaolan Zeng
In this study, a novel Cu-Cu x O/TiO 2 composite photocatalyst was synthesized using combined sol–gel and impregnation methods. Several technologies were employed to characterize the morphology, crystalline structure, optical properties, and surface composition of the as-synthesized photocatalysts . The successful preparation of the Cu-Cu x O/TiO 2 composite was confirmed with superior properties compared to pure TiO 2 and Cu-Cu x O composite. The results for the degradation experiment employing sulfamethazine (SMZ) as the target pollutant indicated that the CT9 (the theoretical molar ratio of Cu(CH 3 COO) 2 to TiO 2 was 9:1) composite exhibits the best photocatalytic performance, and the degradation rate of SMZ reaches 98.2% after 60 min of irradiation. The good repeatability of CT9 was proved by five-cycle experiments. Radicals trapping experiments indicated that superoxide radicals and holes were primary oxidative species in photocatalytic degradation of SMZ. Eleven intermediates for SMZ degradation were identified employing LC-MS technology and the possible degradation pathways were proposed. ECOSAR models were used to predict the biotoxicity of the degradation intermediates. The present research exhibits a new opportunity for the construction of Cu-Cu x O-based photocatalysts to remove contaminants from antibiotic wastewater.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 13
·10594
·
IF 5.6
Zanlin Chen,Haiming Li,Miaojia Xie,Fengguang Zhao,Shuangyan Han
This study proposes a label-free aptamer biosensor for the sensitive detection of malachite green(MG) using gold nanoparticles/multi-walled carbon nanotubes @ titanium dioxide(AuNPs/MWCNTs@TiO2). The nanocomposite provides a large surface area and good electrical conductivity, improving current transfer and acting as a platform for aptamer immobilization. The aptamer and the complementary chain(cDNA) are paired by base complementary to form the recognition element and fixed on the AuNPs by sulfhydryl group, which was modified on the cDNA. Since DNA is negatively charged, the redox probe in the electrolyte is less exposed to the electrode surface under the repulsion of the negative charge, resulting in a low-electrical signal level. When MG is present, the aptamer is detached from the cDNA and binds to MG, the DNA on the electrode surface is reduced, and the rejection of the redox probe is weakened, which leads to an enhanced electrical signal and enables the detection of MG concentration by measuring the change in the electrical signal. Under the best experimental conditions, the sensor demonstrates a good linear relationship for the detection of MG from 0.01 to 1000 ng/mL, the limit of detection (LOD)is 8.68 pg/mL. This sensor is stable, specific, and reproducible, allowing for the detection of various small-molecule pollutants by changing the aptamer, providing an effective method for detecting small-molecule pollutants.Keywords:aptamer;cyclic voltammetry;potassium hexacyanoferrate;sensitive detection;differential pulse voltammetry
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Dian Wang,Xiang Wan,Jiafei Wang,Debby Mangelings,Qin Xu,Fazhi Xie,Xianhuai Huang,Weihua Li,Han Xuan,Wensheng Zou,Qishu Qu
Background Due to its high chemical stability, sufficient rigidity and zwitterionic ion exchange properties, TiO 2 can be considered as an alternative stationary phase material to SiO 2 for high performance liquid chromatography . TiO 2 stationary phase is usually prepared by coating TiO 2 onto SiO 2 support by sol-gel method. However, in the traditional coating method, in order to overcome the rapid hydrolysis rate of tetrabutyl orthotitanate, only a very low concentration of tetrabutyl orthotitanate can be used, resulting in a low loading of TiO 2 on the support. Results TiO 2 core-shell spheres with a good monodispersity were prepared using 0.25 mol L −1 tetrabutyl orthotitanate. The specific surface area, pore volume , pore diameter and TiO 2 loading of the TiO 2 core-shell spheres were 66 m 2 g −1 , 0.15 cm 3 g −1 , 9.8 nm and 57%, respectively. The core-shell spheres were derivatized with n-octadecyltrichlorosilane and then packed into a stainless steel column to test the separation performance for neutral, basic and acidic samples in liquid chromatography. A baseline separation of polyaromatic hydrocarbons was achieved, showing a column efficiency for fluorene of 118075 plates m −1 . The prepared stationary phase was also used to separate acidic and basic mixtures, and column efficiencies of 54500 and 25836 plates m −1 were obtained for N , N -dinitroaniline and p -chlorophenol, respectively. The relative standard deviations of the retention times of polyaromatic hydrocarbons for run-to-run, day-to-day and column-to-column repeatability were all below 5.1%. Significance and novelty This work demonstrated that TiO 2 can be coated in the pores of the shell of SiO 2 core-shell spheres with high TiO 2 loading using a high concentration of tetrabutyl orthotitanate as the titania source. The experimental results show that the TiO 2 coated core-shell spheres can be a good alternative stationary phase for liquid chromatography.
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ACS Omega
·
2023
·
IF 4.1
Miaogen Chen,Wenya Chang,Jing Zhang,Wan Zhao,Zhi Chen
Water pollution caused by antibiotics is a growing problem. Semiconductor photocatalysis is an environmentally friendly technology that can effectively degrade organic pollutants in water. Therefore, the development of efficient photocatalysts is of great significance to solve the environmental pollution problem. In this paper, mixed-phase TiO2 and 1T/2H-MoS2 composite (1T/2H-MoS2/TiO2) were synthesized by the in situ growth method. The prepared compounds were characterized and applied to the visible-light degradation of tetracycline hydrochloride. The photocatalytic effect of 1T/2H-MoS2/TiO2 on tetracycline hydrochloride is significantly enhanced under visible light and has good stability. It has potential applications in the treatment of organic pollutants in water.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Weigui Fu,Yaowei Liu,Jianchao Liu,Bojun Zhang,Ju Cheng,Runhong Du,Meixiu Sun,Yiping Zhao,Li Chen
Design and preparation of membranes with ultrahigh separation performance and antifouling property for oil-in-water (O/W) emulsions remains challenging. In this study, a high flux mullite/TiO 2 ceramic composite membrane was prepared via multi-precipitation of TiO 2 on a whisker mullite hollow fiber support synthesized by combining phase inversion and high-temperature sintering techniques. The results showed that the generated whisker mullite structure improved the permeation flux, and the micro-nano structured TiO 2 functional layer endowed the membrane surface with superhydrophility and stability. The retention of the optimal composite membrane (M20T13) that was soaked in the titanium solution 20 times for 13 min each time for the O/W emulsions like n-hexane, toluene and engine oil maintained over 98 %, and the flux after 6 h filtration was 668.34 L·m −2 ·h −1 , 487.25 L·m −2 ·h −1 and 258.66 L·m −2 ·h −1 , respectively, much higher than that of the optimal substrate (F3A1, mass ratio of fly ash: Al 2 O 3 = 3:1). Moreover, the flux recovery rate of M20T13 was much higher than that of F3A1 after chemical backwashing. This work manifests great potential in O/W treatment fields.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xiang Qin,Yunkang Ji,Lijuan Nong,Chendi Wang,Huiting Li,Chunyu Xie,Lijun Ji,Aiping Zhu
C/Ti 3 C 2 /(001)TiO 2 hollow microspheres were prepared by combining the template method, self-assembly and hydrothermal method . Anatase TiO 2 nanosheets with rich oxygen vacancies formed on the microspheres and exposed active (001) facets due to the spherical surface. TC was removed 92.3% by C/Ti 3 C 2 /(001)TiO 2 -HMs within 160 min, 28.4% by TiO 2 and 49.5% by (001)TiO 2 /Ti 3 C 2 under the same condition. The high removal efficiency of C/Ti 3 C 2 /(001)TiO 2 -HMs could be because the oxygen vacancies exposed on the surface of (001)TiO 2 afforded more active sites, extended the light absorption range and promoted the generation of electron-hole pairs. The composite C/Ti 3 C 2 /(001)TiO 2 structure could suppress the recombination of electron-hole pairs and prolong their lifetime. The degradation pathway of TC was discussed. The TC removal efficiency of C/Ti 3 C 2 /(001)TiO 2 -HMs was confirmed by treating the wastewater from the Slender West Lake. The production principle of oxygen vacancy could be used for preparing MXene composites with excellent catalytic properties and the C/Ti 3 C 2 /(001)TiO 2 -HMs could be a potential choice for treating wastewater.
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AQUATIC TOXICOLOGY
·
2023
·
IF 4.5
Jun Zhang,Xujiao Xie,Qing Li,Ji Wang,Shuai Zhang
With the discharge of nanoparticles (NPs) into the environment, NPs can interact with coexisting organic pollutants, resulting in combined toxic effects. In order to more realistically evaluate the potential toxic effects of NPs and coexisting pollutants on aquatic organisms. We evaluated the combined toxicities of TiO 2 nanoparticles (TiO 2 NPs) and three different organochlorines(OCs)-pentachlorobenzene (PeCB), 3,3′,4,4′-tetrachlorobiphenyl (PCB-77) and atrazine to algae ( Chlorella pyrenoidosa ) in three karst natural waters. The results indicate that the individual toxicities of TiO 2 NPs and OCs in natural waters were less than those of OECD medium, and the combined toxicities were different from but generally similar to those of OECD medium. The individual and combined toxicities were the largest in UW. The correlation analysis showed that the toxicities of TiO 2 NPs and OCs were mainly related to TOC, ionic strength, Ca 2+ and Mg 2+ in natural water. The binary combined toxicities of PeCB and atrazine with TiO 2 NPs to algae were synergistic. The binary combined toxicity of TiO 2 NPs and PCB-77 to algae was antagonistic. The presence of TiO 2 NPs increased the algae-accumulations of OCs. PeCB and atrazine all increased the algae-accumulations of TiO 2 NPs, while PCB-77 showed the opposite result. The above results indicated that due to the influence of different hydrochemical properties in karst natural waters, there were differences between TiO 2 NPs and OCs in their toxic effects, structural and functional damage, and bioaccumulation.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Dongsheng Zhang,Meijiao Wang,Guosong Wei,Renjie Li,Ning Wang,Xiaolong Yang,Zhuo Li,Yan Zhang,Yanhua Peng
Photocatalytic H 2 evolution provides an upcoming route for the production of clean fuel via the conversion of solar energy. TiO 2 , as a potential semiconductor material, is restricted by its faint absorption of visible light, thus limiting its application in water splitting. Herein, high visible light responsive ZnIn 2 S 4 /TiO 2-x nanotube arrays for photocatalytic hydrogen evolution were fabricated by two-step reaction. ZnIn 2 S 4 /TiO 2-x nanotube arrays exhibited the photo response from UV to visible-light region due to the introduction of oxygen vacancies and visible-light driven ZnIn 2 S 4 . Moreover, the heterojunction improved the separation of photogenerated carriers and boosted the electron transfer from ZnIn 2 S 4 to TiO 2-x , thereby increasing the longevity of active electrons, which enhanced the photocatalytic activity for hydrogen evolution. An outstanding H 2 production rate of 581.1 μmol h −1 g −1 was obtained and an apparent quantum yield (AQY) up to ∼ 1.42% was achieved. This work demonstrates that the defect-induced bandgap engineering of semiconductor photocatalysts is a potential way to extend the optical absorption property of TiO 2 to visible light even or NIR and enhance the photocatalytic activity.
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Materials Today Chemistry
·
2023
·
IF 7.3
Wenlong Sheng,Fengwei Huang,Xianjun Lang
Metal–organic frameworks (MOFs) have received increasing attention for conducting miscellaneous photocatalytic reactions. Amorphous TiO 2 , despite the lack of visible light activity, can be a platform for integrating with a Ti-based MOF NH 2 -MIL-125(Ti) during hydrothermal process. Herein, amorphous TiO 2 microspheres are synthesized to enhance the activity of NH 2 -MIL-125(Ti) by integration. The morphology, porosity, and activity of NH 2 -MIL-125(Ti)/amorphous TiO 2 microspheres are systematically investigated by various methods. The photocatalyst NH 2 -MIL-125(Ti)/amorphous TiO 2 exhibits enhanced conversions, more than five times that of pristine NH 2 -MIL-125(Ti), for the selective oxidation of benzylamine. A series of optical and electrochemical characterizations are performed to clarify the mechanism for the photocatalytic selective oxidation of benzyl amines. Specifically, for NH 2 -MIL-125(Ti)/amorphous TiO 2 , visible light absorption is from NH 2 -MIL-125(Ti); and faster electron transfer to molecular oxygen is due to amorphous TiO 2 . This work shows that integrating MOFs with metal oxides can be crucial in enhancing visible light photocatalysis .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Azhar Ali Haidry,Qawareer Fatima,Zhe Wang,Yucheng Wang,Yinwen Ji,Adil Raza
Owing to their unique surface adsorption characteristics, the controlled synthesis of highly ordered mesoporous materials with high adsorption traits is of utmost importance. In the present work, ordered mesoporous TiO 2 (OMT) with tunable channels was prepared via a facile soft-templet evaporation-induced self-assembly (EISA) method. The effect of phenol-formaldehyde resins (PF) and the ratio of triblock copolymer (F127) and tetrabutyl titanate (TBOT) on the OMT surface was studied by Brunauer Emmett Teller (BET) and scanning electron microscopy (SEM) analysis. The samples without PF resol did not offer any ordered mesoporous formation, while a highly ordered mesoporous structure was obtained for samples with PF resol. For the prepared samples, the specific surface area SSA∼141–254 m 2 /g, average pore size S P ∼5.3–9.8 nm and pore volume V P ∼0.29–0.45 cm 3 /g were obtained by controlling the ratio of F127 and TBOT. For 95% relative humidity (RH), the OMT with optimum specific surface area (SSA∼220 m 2 /g) and small pore size (S P ∼5.3 nm) showed a high response (S R ∼3.5 ×10 5 ), fast response time (26 s) and good long-term stability (over 90 days). Finally, the structure, morphology and chemical composition of the samples were determined by XRD , SEM, HRTEM , and XPS techniques to predict and authenticate the plausible sensing mechanism.
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Materials Today Sustainability
·
2023
·
IF 7.8
A. Shan,Y. Lu,L. Cheng,Z. Hou,D. Xili,Y. Li,J. Liu,H. Ma,J. Yang
Due to the high electronegativity , dissolved O 2 molecules can form strong chemisorption on oxygen-deficient nano-TiO 2 , which can alter the photocatalytic degradation process . Regarding this point, there is a lack of sufficient investigation so far, although there have been many reports on oxygen-deficient nano-TiO 2 . Here, we make the dissolved O 2 adsorbed on the oxygen-deficient nano-TiO 2 by simply stirring for a long time. The characterization and theoretical calculation results show that the chemisorption of O 2 significantly enhances the surface hydrogen bonding and results in a substantial increase in the co-adsorbed H 2 O molecules and –OH groups. The co-chemisorbed oxygen species promote the separation of electron-hole pairs, meanwhile accelerate the migration and accumulation of holes to the surface, which effectively enhances the direct oxidation of photogenerated holes. The findings of this work suggest that for long continuous reactions, the role of chemisorbed dissolved O 2 molecules on the photocatalytic degradation activity of oxygen-deficient nano-TiO 2 has to be considered.
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