Journal of Water Process Engineering
·
2021
·
IF 5.485
Jialin Chen,Ruina Zhang,Dong Chen,Jianyong Liu,Shanping Chen
The generation process for the highly reductive carbon dioxide radical ( CO 2 − ) in the Fe(III)-oxalate system is enhanced under UV irradiation and used in nitrate (NO 3 − ) reduction with improved product selectivity to nitrogen (N 2 ). The combination of Fe(III) and residual oxalate forms Fe(III)-oxalate complexes again for an Fe(II)/Fe(III) species cycle and achieves generation of CO 2 − radical continually. The electron paramagnetic resonance (EPR) spectrum demonstrates the existence of CO 2 − radicals in this process. Some of the important control factors, such as initial concentrations of ferric ions (Fe(III)) (0.5, 1, 2, and 3 mM), NO 3 − (14, 21, and 42 mg N/L), oxalate (3, 7, and 10 mM), and pH values (2, 3, 4, 5, and 6), are systematically assessed for NO 3 − reduction efficiency and N-species selectivity. Among all the control factors mentioned, pH is a key parameter with an important role in the NO 3 − reduction process. Excellent NO 3 − reduction efficiency (∼90 %) was achieved at pH 3 in the presence of 1 mM Fe(III) and 10 mM oxalate under UV irradiation for 120 min. High Fe(III) and oxalate concentrations promote NO 3 − removal. In addition, there was an increase in the NO 3 − removal amount with a greater initial NO 3 − concentration. About 60 % of NO 3 − can be selectively reduced to N 2 with low selectivity to NO 2 − (∼3.4 % of total N) and NH 4 + (∼15.7 % of total N). In general, the UV/Fe(III)-oxalate system provided an alternative way to improve NO 3 − removal performance and selectivity to form N 2 in water and wastewater remediation processes.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yangcheng Ding,Wenli Jiang,Bin Liang,Jinglong Han,Haoyi Cheng,Muhammad Rizwan Haider,Hongcheng Wang,Wenzong Liu,Shuangjiang Liu,Aijie Wang
The biological treatment of antibiotic-containing wastewater is a mainstream process, but the antibacterial activity from the persistence of antibiotics would inhibit the biological activity and function of wastewater treatment plants and lead to the risk of transmission of antibiotic resistant bacteria and genes. In this study, UV photolysis was selected as an appropriate pretreatment technology for antibiotic-containing wastewater. It could decompose many kinds of antibiotics and was not inhibited by the coexisting organics in wastewater. The antibacterial activities of five kinds of antibiotics, which were eliminated with UV irradiation, exhibited a significantly positive correlation with their parent compound concentrations. The photodecomposition of the main functional groups in antibiotics contributed to the elimination of antibacterial activity. Defluorination was the main pathway to eliminate the antibacterial activity of antibiotics containing a fluorine substituent (e.g., florfenicol and ofloxacin), while the photoinduced opening of the β-lactam ring was the most efficient route to eliminate the antibacterial activity of β-lactam antibiotics (e.g. cefalexin, amoxicillin and ampicillin). These results demonstrated that UV photolysis could be adopted as an efficient and promising pretreatment strategy for the source control of antibiotic antibacterial activity by the decomposition of antibiotic functional groups before the biological treatment unit.
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-13
·
IF 12.264
Liu Sisi,Li Ming-Yu,Zhang Jianbing,Su Dong,Huang Zhen,Kunwar Sundar,Lee Jihoon
AbstractSection
Highlights
High performance Al nanostructures/ZnO quantum dots heterostructure photodetectors with a controllable geometry of the Al nanostructures are demonstrated.
Light utilization of the photoactive layers is significantly boosted with the Al nanostructures.
The light confinement effect is inherently determined by the geometries of the Al nanostructures.
AbstractSection
Abstract
Light confinement induced by spontaneous near-surface resonance is inherently determined by the location and geometry of metallic nanostructures (NSs), offering a facile and effective approach to break through the limitation of the light-mater interaction within the photoactive layers. Here, we demonstrate high-performance Al NS/ZnO quantum dots (Al/ZnO) heterostructure UV photodetectors with controllable morphologies of the self-assembled Al NSs. The Al/ZnO heterostructures exhibit a superior light utilization than the ZnO/Al heterostructures, and a strong morphological dependence of the Al NSs on the optical properties of the heterostructures. The inter-diffusion of Al atoms into ZnO matrixes is of a great benefit for the carrier transportation. Consequently, the optimal photocurrent of the Al/ZnO heterostructure photodetectors is significantly increased by 275 times to ~ 1.065 mA compared to that of the pristine ZnO device, and an outstanding photoresponsivity of 11.98 A W −1 is correspondingly achieved under 6.9 mW cm −2 UV light illumination at 10 V bias. In addition, a relatively fast response is similarly witnessed with the Al/ZnO devices, paving a path to fabricate the high-performance UV photodetectors for applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Qingming Huang
The preparation of high performance upconversion luminescence materials with stronger shortwave emissions is still a challenge. In this work, the feature of hexagon circles sublattice structure of tetragonal LiYF 4 was revealed, and the sublattice level energy clusters of 4 Yb 3+ -1Tm 3+ were constructed by the substitution of 70 mol% Yb 3+ for Y 3+ in tetragonal LiYF 4 matrix. The sensitizing ions concentration quenching was inhibited by the hexagon circles sublattice structure, and the upconversion luminescence was dramatically enhanced, especially, the UV band emission was enhanced about 20 times and the intensity ratio of UV to blue emissions was improved about 10 folds under the excitation power density of 0.230 W/cm 2 . Photon numbers of upconversion emissions obviously decreased with the increasing of sublattice level energy clusters that the upconversion process of three photons was changed to two steps of two photons process. The upconversion luminescence mechanism of sublattice energy cluster construction was system investigated. The material with high performance of UV and blue UC luminescence can be a well candidate for the applications of photodynamic therapy and photocatalytic, etc. The work may be an inspiration for high efficient UC luminescence materials design and preparation.
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PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Yong Qian,Yijie Zhou,Lan Li,Weifeng Liu,Dongjie Yang,Xueqing Qiu
Aromatic skeleton and polyhydroxyl structure endow biomass lignin with excellent dispersibility, reactivity, and UV-blocking property. Herein, spherical microcapsules loaded with isophorone diisocyanate (IPDI) as core materials were prepared via interfacial polymerization in an oil-in-water emulsion, using sodium lignosulfonate (NaLS) as an emulsifier. Small amount of polydiphenylmethane diisocyanate (PMDI) was added to reinforce the shells of the capsules. The results show that the capsules were 43.4–118.3 μm with a shell thickness of 1.9–2.5 μm. The core fraction was approximately 72.6 wt% and the functional groups of IPDI, such as cyanates, were well preserved. The NaLS-based microcapsules were subsequently mixed and reacted with hexamethylene diisocyanate (HDI) and amine component successively to form new polyurea. When the new polyurea was coated on a steel substrate, it exhibited excellent self-healing property after being scratched. The healed polyurea presents nearly the same anticorrosion ability as the unscratched coating in a solution with high salt concentration. Moreover, the addition of NaLS-based capsules could effectively slow down the aging process of polyurea coatings. The color change of the self-healing polyurea leveled off after 200 h of UV irradiation, while retaining 40% of the breaking strength and 50% of elongation at break. Comparatively, the color of pure polyurea deepened continuously and the mechanical property disappeared completely.
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Journal of Coatings Technology and Research
·
2022
·Vol. 20
·期 1
·321-331
·
IF 2.339
Bian Fuping,Li Xiaoquan,Zhao Jihe,Hu Jiwen,Gui Xuefeng,Li Shi,Lin Shudong
As described herein, a simple one-step hydrosilylation reaction was employed to synthesize alicyclic epoxy silicone prepolymers by using poly(dimethylsiloxane-co-methylhydrosiloxane) (PDMS-PHMS) with different hydrogen contents and 4-vinyl-1-cyclohexene-1,2 epoxide (VCHO) as precursors. The structures of the synthesized epoxy polysiloxane oligomer was characterized by Fourier-transform infrared (FTIR) and proton nuclear magnetic resonance ( 1 H-NMR) spectroscopy techniques, thus confirming the successful synthesis of the prepolymers. With the addition of an appropriate amount of cationic photoinitiator, the epoxy polysiloxane prepolymers undergo cationic polymerization under ultraviolet light irradiation and were quickly cured to yield series of epoxy polysiloxane resin films. The performances of these cured films were tested and characterized by various techniques such as UV transmittance, thermal weight loss analysis, and contact angle and pencil hardness measurements. The results revealed that the surfaces of these films were uniform and transparent, and these films had excellent heat resistance, acid resistance, hydrophobicity, and ink removal properties. In addition, the influence of the cycloaliphatic epoxy monomer content on the curing behavior and network performance is explored. This study reveals that the curing rate increases as the amount of grafted cycloaliphatic epoxy monomer is increased and that a denser crosslinking network provides the resultant film. Finally, the photocurable silicone material investigated herein is simple to prepare and has excellent performance, and has potential applications in the field of anti-smudge coatings.
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Gels
·
2022
·Vol. 9
·期 1
·10
·
IF 4.432
Yanjin Tang,Yuhan Lai,Ruiqin Gao,Yuxuan Chen,Kexin Xiong,Juan Ye,Qi Zheng,Zhenxing Fang,Guangsheng Pang,Hoo-Jeong Lee
Functional aerogels composed of regenerated cellulose and tungsten oxide were fabricated by implanting tungsten-oxide nanodots into regenerated cellulose fiber. This superfast photochromic property benefitted from the small size and even distribution of tungsten oxide, which was caused by the confinement effect of the regenerated cellulose fiber. The composite was characterized using XRD and TEM to illustrate the successful loading of tungsten oxide. The composite turned from pale white to bright blue under ambient solar irradiation in five seconds. The evidence of solar absorption and electron paramagnetic resonance (EPR) demonstrated the fast photochromic nature of the composite and its mechanism. Furthermore, carbon fiber filled with preferential growth tungsten-oxide nanorods was obtained by annealing the photochromic composite in a N2atmosphere. This annealed product exhibited good absorption across the whole solar spectrum and revealed an excellent photothermal conversion performance. The water evaporation rate reached 1.75 kg m−2h−1under one sun illumination, which is 4.4 times higher than that of pure water. The photothermal conversion efficiency was 85%, which shows its potential application prospects in seawater desalination.Keywords:functional aerogels;regenerated cellulose;color center;solar absorbent;desalination
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaoshan Dong,Xiaochao Zhu,Fawei Lin,Beibei Yan,Jian Li,Guanyi Chen
Tar formation during biomass gasification reduces energy efficiency and poses a negative impact on downstream applications. A photothermal steam reforming (PTR) system based on LaMn x Ni 1-x O 3 (0 ≤ x ≤ 1) perovskite was developed to convert tar into combustible gas. The effects of Mn substitution, temperature, and the steam to carbon ratio on PTR activity were investigated. Mn substitution increased the content of surface adsorbed oxygen and maintained the perovskite structure of LaMn 0.4 Ni 0.6 O 3 (LM4N6). Moreover, LM4N6 showed improved optical absorption and electron-hole separation properties. LM4N6 presented 90 % carbon conversion during PTR at 400 °C. Due to the introduction of ultraviolet–visible light (UV–vis), LM4N6 obtained better catalytic activity and stability in PTR than in the thermal catalytic reforming process. Detailed characterization and experiments proved that UV–vis effectively activated Ni sites and the oxygen species on LM4N6 and formed a photothermal synergistic effect, which inhibited carbon deposition and improved catalytic activity and stability. This work provides a novel concept for the conversion and utilization of biomass tar at low temperatures.
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CHEMOSPHERE
·
2019
·
IF 5.108
Huanhuan Zhu,Ruibao Jia,Shaohua Sun,Guixue Feng,Mingquan Wang,Qinghua Zhao,Xiaodong Xin,Anran Zhou
The elimination of 2,3,6-trichloroanisole (2,3,6-TCA), which produces a musty-earthy off-odor in water, by an ultraviolet (UV)/H 2 O 2 process was assessed. The removal of 88.1% of 2,3,6-TCA in ultrapure water (UPW) was achieved using an initial 2,3,6-TCA concentration of 1 μg L −1 (4.73 nM), a H 2 O 2 concentration of 20 mg L −1 (0.588 mM), a UV intensity of 1.44 mW cm −2 and a pH of 8.2. The reaction was found to be pseudo first order with a rate constant ( k obs ) of 0.0340 min −1 . Both the removal efficiency and k obs increased significantly upon increasing the H 2 O 2 concentration from 10 to 50 mg L −1 . The second order rate constant ( k HO·,2,3,6-TCA ) in competition kinetic trials was determined to be 8.17 × 10 7 M −1 s −1 . Degradation products generated during both the UV photolysis and UV/H 2 O 2 treatment of 2,3,6-TCA solutions were analyzed using ultrahigh resolution gas chromatography/mass spectrometry, and the degradation mechanism was proposed. The toxicities of water solutions during both processes were assessed via a luminescence method in conjunction with Vibrio fischeri . The pH and Cl − , HCO 3 − and natural organic matter concentrations of the aqueous medium were all found to significantly affect the removal of 2,3,6-TCA. The degradation rates of trichloroanisoles (TCAs) in real-world water samples demonstrated that UV/H 2 O 2 has significant potential with regard to controlling TCAs as pollutants in water.
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POLYMER
·
2026
·
IF 5.1
Yu Huang,Xiaozhen Jin,Shuwen Wen,Chenchen Zhou,Yadong Wang,Zongmin Zhu
DHAT enabled UL-94 V-0 at only 4 wt% and raised the LOI to 29.7%. • PHRR, THR, and TSP decreased by 35.1%, 42.5%, and 30.2%, respectively. • Gas- and condensed-phase synergy suppressed volatiles and reinforced char formation. • ESP, BDE, and TD-DFT calculations clarified synthesis, pyrolysis, and UV absorption. • DHAT enhanced mechanical strength, UV shielding, and dielectric performance. A novel phosphorus/nitrogen-containing flame retardant, DHAT, was synthesized and incorporated into epoxy resin (EP). At only 4 wt% loading, EP/4DHAT achieved a UL-94 V-0 rating, and its LOI increased from 21.8% to 29.7%. The pHRR, THR, and TSP were reduced by 35.1%, 42.5%, and 30.2%, respectively. TG-FTIR, char analysis, and bond dissociation energy (BDE) calculations revealed a gas-phase and condensed-phase synergistic flame-retardant mechanism. In addition, the tensile and flexural strengths of EP/4DHAT increased by 11.4% and 77.9%, respectively. EP/4DHAT maintained approximately 87% visible-light transmittance at 600–800 nm and exhibited effective UV shielding over 200–400 nm, which was attributed to the readily accessible low-energy electronic states and strong allowed transitions introduced by DHAT. The dielectric constant and dielectric loss were also reduced. These results demonstrated that DHAT effectively integrated flame retardancy, mechanical enhancement, optical functionality, and favorable dielectric performance into EP composites. Download: Download high-res image (383KB) Download: Download full-size image
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JOM
·
2023
·
IF 2.6
Da Yaling,Liu Jianxing,Xue Xiangxin
An ultraviolet (UV)-curing polymer coating is an environmentally friendly coating with no volatile organic compound emissions, which can be used for surface protection of steel. However, pure organic polymer coatings cannot meet the needs of practical applications because of their low hardness, poor thermal stability, and high shrinkage rate. In this paper, different contents of mica particles were mixed into epoxy acrylates to prepare UV-curing organic–inorganic composite coatings. The inorganic material was used to enhance the thermal stability and corrosion resistance performance to solve part of the problems faced by a pure organic polymer coating. This paper discusses the UV-curing process of the composite coating, the distribution of particles in the matrix resin, the mechanical properties of the coating, and its thermal stability and corrosion resistance. The results show that the prepared composite coatings show significant improvements in thermal stability and corrosion resistance. Compared with the epoxy acrylate coating, the T 10 of the mica-added composite coating with mica was increased by more than 100°C. At 15 g addition (373,070 Ω cm 2 ), there was a 35 times improvement in the total impedance after immersion in 3.5 wt.% NaCl solution for 24 h compared to that of the epoxy acrylate coating (10,799 Ω cm 2 ).
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CELLULOSE
·
2023
·Vol. 30
·期 7
·4713-4733
·
IF 5.7
Chen Maoshuang,Ayaz Pirah,Xiao Yuanxiang,Li Yong,Wang Pei,Huang Wenjia,Zhao Shujun,Fu Feiya,Liu Xiangdong,Xiang Shuangfei
Versatile cotton fabrics can be used in a variety of special environments and offer unparalleled advantages in textile products. In this work, bio-based phytic acid (PA), octadecylamine (ODA) and TiO 2 (NPs) were used as raw materials to prepare multifunctional cotton fabrics with excellent flame retardant (LOI = 48.5%), hydrophobic (WCA = 152°), UV-blocking (UPF = 2000) and antibacterial (BR = 100%) properties through a facile and scalable dip coating and spraying process. Firstly, the phytic acid was grafted onto the surface of cotton fabric by esterification reaction between its phosphoric acid group and the hydroxyl group of cellulose molecules. Then ODA reacted with the residual phosphoric acid group of phytic acid to form an ODA layer, for further immobilizing TiO 2 (NPs) particles on the surface of cotton fabric. The resulting cotton fabric possessed excellent flame resistance (LOI > 36.2%), hydrophobicity (WCA > 138°), UV-blocking (UPF = 2000) and antibacterial abilities (BR > 96.0%) even after 20 washing cycles. Moreover, this modification process did not sacrifice the desired cotton properties, including water vapor permeability, flexibility and tensile strength. This work proposed a simple and scalable pad-dry curing method to construct stable and multifunctional cotton textiles, which have broadened application prospects in many fields. Graphical abstract
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危险品化学品经营许可证（带存储）