Journal of Materials Chemistry B
·
2016
·Vol. 5
·期 3
·595-603
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IF 4.872
Yan Xiao,Sihuan Lang,Miaomiao Zhou,Jing Qin,Rui Yin,Jingming Gao,Andreas Heise,Meidong Lang
A series of biodegradable and crosslinkable precursors based on poly(4-methyl-ε-caprolactone) (PMCL) were prepared by ring-opening polymerization (ROP), followed by the complete acrylation of both hydroxyl ends. Afterwards, biodegradable networks exhibiting totally amorphous character were obtained via photocrosslinking without organic solvent or high temperature. As a result, their mechanical properties varied significantly from brittle to elastic upon increasing the length of the PMCL precursors. Both covalent crosslinking and trapped entanglements between crosslinking segments were likely to contribute to the unique properties of the bioelastomer. In particular, networks formed by the precursors with large molecular weights presented high flexibility and resilience, which match the mechanical properties of soft tissues like blood vessels, bladder and cardiovascular tissue. Preliminary degradation and in vitro cytotoxicity studies of the crosslinked network showed excellent biodegradability and biocompatibility. Moreover, it was demonstrated that the liquid-like PMCL precursor made the patterning easily processable even in the absence of any solvent or heating.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Yurong Gu,Tongzhou Liu,Qian Zhang,Wenyi Dong
As one of the most reactive species, hydrated electron (e aq − ) is promising for decomposing recalcitrant organic pollutants, such as perfluorooctanoic acid (PFOA). In this study, PFOA decomposition was systematically investigated using a high photon flux ultraviolet (UV)/sulfite system. It showed had fast PFOA decomposition kinetics through significant promotion of e aq − production at favorable pH condition (pH > 9.2). At initial solution pH 9.2, with initial dissolved oxygen (DO) about 5 mg/L, and at around 25 °C, all PFOA was decomposed to less fluorinated compounds within 10 min from its initial concentration of 38.7 μM. Accompanying PFOA decomposition, short chain perfluorocarboxylic acids (PFCAs) and less fluorinated compounds were detected, indicating a stepwise decomposition mechanism. The k obs of PFOA decomposition was 0.455 min −1 , and approximately 6–910 folds faster than those reported by other reductive methods. At a fixed UV photon flux, PFOA decomposition kinetics showed a positive linear dependence with the initial sulfite dosage. Increasing initial sulfite dosage at a less favorable pH condition (pH 8.0) showed enhancement in PFOA decomposition. But it does not work at acidic and neutral pH conditions. The residual sulfite in the treated solution has acute toxicity, but it can be efficiently removed by using aeration. The outcomes of study will extend the understanding of the high photon flux UV/sulfite treatment system, and help to facilitate its further practical use in recalcitrant organic pollutants decomposition.
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DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 13
·4296-4302
·
IF 4.029
Tao Ji,Ze Cui,Wenlong Zhang,Yunjiu Cao,Yongfang Zhang,Shu-ang He,Mingdong Xu,Yangang Sun,Rujia Zou,Junqing Hu
Herein, we report a photocatalytic heterojunction device of rutile TiO2 nanorod arrays based on a p–n silicon junction (TiO2@PN) and its full absorption of ultraviolet and visible light for synergistic photodegradation. The fabricated TiO2@PN had excellent photocatalytic degradation of methyl orange (MO) under irradiation of a 300 W Xe lamp, and its pseudo-first-order rate constant k was 0.221 h−1, which was greatly higher than that for TiO2 nanorod arrays based on an n–p silicon junction (TiO2@NP, 0.078 h−1) and glass (TiO2@G, 0.032 h−1). The higher photocatalytic performance of TiO2@PN could be attributed to the fact that the photovoltage (PV) of the p–n junction promotes separation of the electron–hole pairs of the TiO2, and the holes are thus left within the TiO2 nanorods to produce a strong oxidant of hydroxyl radicals (˙OH). Moreover, this heterojunction device could be easily fabricated in a large size for easy recovery and recycling, which shows its promise in the solar-driven degradation of environmental pollution.
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CHEMICAL PAPERS
·
2017
·Vol. 69
·期 2
·262-268
·
IF 1.258
Cai Long-Fei,Zhong Ming-Hua,Chen Wen-Yin,Xu Chun-Xiu,Wu Yun-Ying
A method was developed for the fabrication of microfluidic paper-based analytical devices (μPAD). This method was based on the silanisation of cellulose in filter paper using alkyltrimethoxysilane coupled with UV radiation. The filter paper sheet was hydrophobised by immersion in an octadecyltrimethoxysilane/heptane (OTMS/heptane) solution (0.25 vol. %) containing 5 vol. % of ethyl acetate (EtOAc). The hydrophobic-hydrophilic contrast was generated on the filter paper after the hydrophobised paper sheet was exposed to UV light with a metal mask creating the desired pattern on the sheet. The exposed area was oxidised to create a hydrophilic area, while the hydrophobic area was protected by the metal mask. The optimal conditions for the fabrication of μPAD were studied; these included ethyl acetate concentration ( C EtOAc ), immersion time, octadecyltrimethoxysilane concentration ( C OTMS ) and exposure time. This method is cost-effective and simple. In addition, different functional groups could be further grafted for various assay purposes. To demonstrate the feasibility of the μPAD in analytical applications, a flower-shaped μPAD with eight channels and eight detection units was fabricated and used to determine the nitrite content in pickled vegetables. The nitrite content (124 µg g −1 ) in the sample determined by this method compared favourably with that measured using a standard method (137 µg g −1 ).
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CONSTRUCTION AND BUILDING MATERIALS
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2016
·
IF 2.421
Canlin Zhang,Jianying Yu,Song Xu,Lihui Xue,Zhilong Cao
Triethoxyvinylsilane surface organic modified layered double hydroxides (TEVS-LDHs) were prepared and applied to improve the ultraviolet aging resistance of bitumen. The effect of TEVS-LDHs and LDHs on the temperature susceptibility and rheological properties of bitumen before and after UV aging were thoroughly investigated. The storage stability test showed that the difference in the softening point (ΔS) of LDHs modified bitumen (the LDHs content at 2%) decreased from 1 °C to 0.4 °C after TEVS surface organic modification, and the descending trend was more obvious with the content of LDHs increase, which implied that TEVS-LDHs dispersed better and existed more stably in bitumen than LDHs. The introduction of TEVS-LDHs significantly alleviated the temperature susceptibility of bitumen and increased the rutting factor (G ∗ /sin δ) of bitumen, indicating that TEVS surface organic modification were favorable to the improvement of high-temperature performance for LDHs modified bitumen. After UV aging, bitumen became more hard and brittle, compared with LDHs, the addition of TEVS-LDHs alleviated obviously the deterioration tendency of bitumen, which suggested that LDHs surface organic modified by TEVS were far superior to unmodified LDHs in enhancing the UV aging resistance of bitumen.
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ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Qing Wang,Guangxue Chen,Yanyan Cui,Junfei Tian,Minghui He,Jian-Wen Yang
In this paper, we reported castor oil based biothiol (CO-SH) as a highly stable and self-initiated oligomer for photoinitiator (PI)-free UV coating. CO-SH was synthesized via esterification reaction between castor oil (CO) and 3-mercaptopropionic acid (MPA). The results of both proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared spectroscopy (FTIR) revealed that the targeted oligomer was successfully prepared. The oligomer with the number-average molecular weight of 2040 g mol–1 exhibited a narrow molecular weight distribution (PDI = 1.23). CO-SH could be stored at 80 °C for 7 days with only a light C═C conversion (≈6%); hence, the steric effect of the vegetable oil molecule gave the primary biothiol an excellent temporal stability. Furthermore, real-time FTIR results indicated that excellent photopolymerization profiles were obtained, and the final conversions of double bond and thiol were 100% and 77% in the absence of PI, respectively, showing the rapid self-initiated photoactivity. In addition, the self-initiated photopolymerization mechanism of CO-SH was investigated. Finally, the UV-curable films of CO-SH also showed good physical and chemical properties.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Haichao Dai,Yujing Sun,Pengjuan Ni,Wangdong Lu,Shu Jiang,Yilin Wang,Zhen Li,Zhuang Li
A multifunctional TiO 2 /Ag nanoparticles (AgNPs) complex substrate was prepared via a three-step approach, which included the hydrothermal route on a Ti substrate, the deposition of Ag by photo-reducing method and the annealing treatment under high temperature. The effect of the annealing process on the morphology, structure and surface-enhanced Raman scattering (SERS) performance of the substrate was systematically investigated, and the optimal substrate was obtained. Herein, 4-aminothiophenol (4-ATP), methylene blue (MB) and crystal violet (CV) were employed as probe molecules to test the sensitivity and UV-cleanable property of the hybrid SERS substrate. The results suggested that the substrate exhibited relatively high enhancement ability, good stability, reproducibility, and recyclability. The synthesised SERS-active substrate was further used to detect thiram molecules, a kind of pesticides, and the limitation of detection in ethanol, apple juice and apple peel reached 10 −7 M, 10 −6 M and 240 ng/cm 2 , respectively. The detection limit of thiram in the apple juice was below than the maximal residue limit of 7 ppm (2.9 × 10 −5 M) in fruit prescribed by the U.S. Environmental Protection Agency (EPA). These results demonstrated that TiO 2 /AgNPs complex substrate exhibited promising application with respect to its potential use for on-site detection of residual pesticides.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Shengnan Chen,Zhiwei Zhao,Li Li,Fuyi Cui
Ultrafiltration (UF) is widely used in drinking water plants, nevertheless, it still encounters challenges stemming from inevitable membrane fouling caused by natural organic matter (NOM). Herein, this work applied VUV/PS as UF membrane pretreatment and used UV/PS for comparison. VUV/PS system exhibited superior ability in removing NOM compared to UV/PS system. HO and SO 4 − played crucial roles in the degradation. [SO 4 − ]ss was notably higher than [HO ]ss in the systems, yet HO was of greater significance. [HO ]ss and [SO 4 − ]ss in the VUV/PS process were remarkably higher than those in the UV/PS process, due to the function of 185 nm photons. VUV/PS pretreatment basically recovered flux and effectively reduced fouling resistance, with better performance than UV/PS. Fouling mechanism was dominated by multiple mechanisms after UV/PS pretreatment, whereas it was transformed into pore blockage after VUV/PS pretreatment. Moreover, the UF effluent quality after VUV/PS pretreatment outperformed that of UV/PS but fell short of that without pretreatment, possibly due to the generation of abundant low MW substances under the action of HO and SO 4 − . After chlorine disinfection, UV/PS and VUV/PS pretreatments increased the DBPs production and cytotoxicity. Specifically, oxidant PS affected the membrane surface morphology and fouling behaviors, and had no obvious effect on interception performance and mechanical properties. In actual water treatment, VUV/PS and UV/PS pretreatments exhibited excellent performance in alleviating membrane fouling, improving water quality, and reducing DBPs formation and acute toxicity.
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JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2017
·Vol. 25
·期 1
·68-75
·
IF 1.558
Bin Zhang,Jian Han
Zhang, B. and Han, J. (2019), Enhanced protective properties and UV stability of poly(lactic acid)/poly(vinyl acetate)/ZnO microcapsule nanocomposite. J Vinyl Addit Technol, 25: 68-75. doi: 10.1002/vnl.21604 . The above article from the Journal of Vinyl & Additive Technology, published online on 15 September 2017 in Wiley Online Library ( wileyonlinelibrary.com ), has been retracted by agreement by the authors, the Journal Editor-in-Chief Alan Lesser, and Wiley Periodicals, Inc. The retraction has been agreed upon following the explanation by corresponding author Bin Zhang that this article contained irreproducible results. After efforts to replicate and adjust the enlarge test, the authors found misleading scientific content in Figures 2b, 4, 6, 8, 9b, and 11c-d based on incorrect comparisons to prior work in the journal Fibers & Polymers as follows: Zhang B, Han J. Preparation and UV-protective property of PVAc/ZnO and PVAc/TiO2microcapsules/poly(lactic acid) nanocomposites. Fibers and Polymers, 2016, 17(11):1849-1857. DOI 10.1007/s12221-016-6,679-1 .
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CERAMICS INTERNATIONAL
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2017
·
IF 2.986
Xiang Lv,Tianhe Wang,Wei Jiang
We report a facile method to prepare porous TiO 2 and ZnO photo-catalytic ceramics in which colloidal silica was added to yield nano fused silica (FS). The colloidal silica forms continuous media within the porous ceramic structure, and when calcined at 550 °C, it converted to fused silica phase which is an excellent UV wave-guiding material. With light wave guiding effect of FS and capillary effect of reaction solution in the porous channels, the photo-catalytic reactions could occur at the vast active sites at interface inside the porous bulks, as well as at the external surfaces. Photo-catalysis experiments and kinetics were investigated and analyzed. The photo-catalytic efficiencies tested for methylene blue were enhanced by a factor of 4.1 for TiO 2 /FS system and, astonishingly, by a factor of 34.6 for ZnO/FS system, when compared with pure TiO 2 and ZnO under identical testing conditions. A model of UV-waveguide ceramic systems was proposed and discussed. This study proposes a practical approach to construct UV-waveguide porous structures, of which the principle is also potentially applicable to other types of photo-catalytic materials, including visible light active photo-catalysts.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 11
·e6598
·
IF 3.1
Lingmei Jiang,Chenghao Wang,Changhong Xiao,Guangsheng Zhang,Yibo Wang,Haoran Liu,Kuanyu Yuan,Lishuai Zong,Jinyan Wang,Xigao Jian
For large-area electronic and high shape complexity structure applications, various solution-processable materials are chosen as dielectric layer due to their simple molding process via spin-coating, casting, or 3D printing at room temperature. Herein, the acrylic-ended fluorinated hyperbranched polyaryletherketone ( hb -P6FAEK-Ace) was used as the prepolymer and then, the composition of photosensitive resin formula was regulated by adjusting the addition ratio of hb -P6FAEK-Ace and diluents (acrylimorpholine [ACMO] 1,6-Hexanediol diacrylate [HDDA]). These photosensitive resin solutions showed the relative low viscosities ranged ranging from 18 to 253 mPa S at 100°C which was in favor of the future 3D printing method and printing accuracy. Then, the obtained UV-cured films show the maximum tensile strength up to 71.9 MPa and superior thermal properties with the T g of 157°C–177°C and T 5% of 314°C–351°C. Moreover, they also exhibited the good dielectric performance with dielectric constants of 2.43–2.20 and dielectric loss of 0.013–0.014 at 1 MHz–1 GHz. These abovementioned satisfactory performance could be ascribed to the aromatic skeleton of hb -P6FAEK-Ace, introduced polarizability-CF 3 groups and the inner cavities for the hyperbranched structures, also the precise control of formula composition. Additionally, the curing degree, shrinkage of solid, and moisture properties were also researched thoroughly. This work provides a simple formula design though to construct the high performance and low dielectric photosensitive resin for the requirements of microelectronic applications.
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Small
·
2024
·
IF 13
Bocong Zou,Yang Yang,Hulin Wang,Weijun Li,Lin Wang,Fengmei Gao,Dongdong Zhang,Marko Gloginjić,Marko Erić,Srdjan Petrović,Weiyou Yang,Huan He,Shanliang Chen
In the realm of photodetector (PD) technology, photoelectrochemical (PEC) PDs have garnered attention owing to their inherent advantages. Advances in this field depend on functional nanostructured materials, which are pivotal in improving the separation and transport of photogenerated electron–hole pairs to improve device efficiency. Herein, a highly photosensitive PEC UV PD is built using integrated self-supporting SiC/ZnS heterojunction nanowire array photoelectrodes through anodization and chemical deposition. Compared with the original SiC nanoarrays, the optimized SiC/ZnS-25 nanoarrays exhibit high photocurrent density ( D ph , 809.2 µA cm −2 ), rapid rise/decay times ( τ r / τ d , 4/21 ms), high responsivity ( R λ , 1.226 A W −1 ), remarkable detectivity ( D * , 2.517 × 10 11 Jones), and large external quantum efficiency ( EQE , 40.57%) under 375 nm UV light with a bias voltage of 0.6 V. Furthermore, SiC/ZnS-25 delivers excellent self-powered performance, with R λ , D * , and EQE reaching 0.91 A W −1 , 1.69 × 10 11 Jones, and 30.24%, respectively. In addition, the device exhibits excellent long-term operation and aging stability under a bias voltage of 0.6 V and under self-powered conditions. The excellent photodetection behaviors of the SiC/ZnS PEC PD are mainly ascribed to the synergistic effect of the novel well-aligned nanowire geometry, heterojunction with ZnS nanofilms of optimal thickness, and integrated self-supporting configuration of the photoelectrode.
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