Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Xiye Zhang,Mingguo Peng,Qiuya Zhang,Xiaoyan Ma,Jiabao Song,Minrui Sun,Erdeng Du,Xia Xu
Aging of microplastics (MPs) under natural conditions takes several months or even years. In this study, polystyrene MPs (PS-MPs) were used as the target MPs, and these were subject to artificially accelerated aging by UV irradiation (UV 254 ) and UV/heat-activated persulfate (UV+K 2 S 2 O 8 ). The physicochemical characteristics of aged MPs and the interaction with tetracycline hydrochloride (TH) were investigated. Simultaneously, the fluorescence characteristics, total organic carbon content (TOC), and toxicity effects of aging filtrate were also evaluated. Furthermore, the aging path of PS-MPs was derived with reactive species analysis using an electron paramagnetic resonance (EPR) test. The results showed that obvious cracks appeared on the surface of the aged PS-MPs, with the average particle size decreasing from 83.95 ± 19.93 µm to 60.41 ± 19.58 µm in the UV treatment and to 48.02 ± 18.83 µm in the UV+K 2 S 2 O 8 treatment. The oxygen-containing functional groups of aged MPs were detected after the UV and UV+K 2 S 2 O 8 treatment; the carbonyl index (CI) values were 0.44 and 0.62, respectively. The TH adsorption capacity of UV-treated MPs and UV+K 2 S 2 O 8 -treated MPs increased from 0.176 mg g −1 for pristine MPs to 0.193 mg g −1 and 0.225 mg g −1 , respectively. Especially, the TOC and luminescent inhibition toxicity of the filtrate increased after aging. EPR analysis demonstrated that SO 4 •− and ROS played a key role in accelerating the aging of PS-MPs. This study provided a reference for UV photoaging behavior of MPs enhanced by activated K 2 S 2 O 8 , which is meaningful for a comprehensive understanding of MPs behavior and the risks they introduce into the environment.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 25
·67174-67186
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IF 5.8
He Jing,Chen Sijia,Xu Yulin,Sun Mengxin,Yang Tingting,Liang Li,Xiong Xinyu
Over recent years, much attention has been paid to aging problem of microplastics and adsorption behavior of antibiotic on microplastics. In this study, four microplastics, including polystyrene (PS), polypropylene (PP), polyamide (PA) and polyethylene (PE), were photoaged by UV light in anoxic environment. The surface characteristics of microplastics and adsorption behavior of norfloxacin (NOR) on microplastics were investigated. Results indicated that the specific surface area and crystallinity increased, and hydrophobicity weakened of microplastics after UV aging. The content of C element decreased and the content of O barely changed in the aged microplastics. In addition, the adsorption of NOR on microplastics yielded a better fitness for the pseudo-second-order kinetics, Langmuir and Freundlich models. The adsorption capacities of NOR on PS, PA, PP, and PE at 288 K were 16.01, 15.12, 14.03, and 13.26 mg·g −1 , respectively, while the adsorption capacities of NOR on aged microplastics were reduced to 14.20, 14.19, 11.50, and 10.36 mg·g −1 , respectively, due to decrease of hydrophobicity and increase of crystallinity of microplastics after UV aging. The adsorption of NOR on microplastics decreased with the increase of temperature, implying the adsorption process was exothermic. Adsorption mechanism analysis showed that Van der Waals force was the main influential mechanism of the adsorption of NOR on PP and PE, and hydrogen bond was the main factor affecting the adsorption of NOR on PA, while the π-π interaction was the main mechanism impacting the adsorption of NOR on PS. Aging time and salinity significantly affect the adsorption of NOR on microplastics. With the increase of humic acid concentration and pH, the adsorption of NOR on microplastics first reduced and then rose. This study provides a basis for further clarifying the mechanism of UV aging microplastics and a reference for the study of combined pollution behavior of microplastics and antibiotics.
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高影响因子
E-POLYMERS
·
2023
·Vol. 23
·期 1
·
IF 3.7
Meng-Zhen Zhou,Hao-Ran Wang,Xing Guo,Yan-Chan Wei,Shuangquan Liao
The oxidation of natural rubber (NR) leads to a decrease in mechanical properties, even resulting in failure of NR products. Many studies focusing on this single factor have failed to fully elucidate the impact of tropical island environment on NR properties. Based on this concern, the synergistic effect of thermal oxygen and ultraviolet (UV) aging on NR was systematically studied. The results revealed that thermal oxygenation can promote UV aging, which leads to the appearance of surface cracks and deepening of color. With the extension of aging time, the mechanical properties of NR correspondingly decreased. Besides, to deeply understand the mechanism of the synergistic effect of thermal oxygen and UV aging on NR, we selected squalene to simulate and analyze the molecular structure changes in NR. Based on these results, a possible synergistic effect of thermal oxygen and UV aging mechanisms on NR could be proposed.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yuanzhe Liu,Shuo Lv,Mingzu Zhang,Jinlin He,Peihong Ni
Cellulose acetate (CA) is attractive for use as a separator in lithium-ion batteries (LIBs). However, the dissolubility in the liquid electrolyte limits its applications. Herein, we would report a cellulose acetate (CA) cross-linked film for the separator of lithium-ion battery . First, methacrylate modified cellulose acetate (M-CA) was prepared by esterification between CA and methylacryloyl chloride. Subsequently, an insoluble polymer membrane was obtained through the UV-induced polymerization of M-CA, poly(ethylene glycol) methyl ether methacrylate (PEGMEMA) and trihydroxymethylpropyl trimethylacrylaye (TMPTMA). The results show that these polymer membranes have good thermal and chemical stability due to the cross-linked polymer matrix . When the amount of TMPTMA is 20% of the molar amount of PEGMEMA, not only has the obtained gel polymer electrolyte (GPE) a suitable ionic conductivity of 4.17 mS cm −1 and an excellent lithium ion transfer number of 0.80, but also it has discharge capacity of the half battery composed of LiFePO 4 /GPE/Li 120 mAh g −1 at 2 C. This study demonstrated a great possibility that the high-performance and biodegradable GPE could be applied in LIBs. In addition, there are many other methacrylate monomers that can be polymerized with M-CA to prepare various GPEs, which will open a new avenue for the application of CA in GPEs.
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Biomaterials Science
·
2019
·Vol. 7
·期 6
·2383-2393
·
IF 5.251
Wanyun Song,Xinyi Li,Yuquan Zhao,Chaoying Liu,Junying Xu,Huiyu Wang,Tao Zhang
The capture of circulating tumor cells (CTCs) plays a crucial role in the early diagnosis, personalized treatment and postoperative evaluation of malignant tumors. In this study, UV-curable coating technology was combined with antibody immobilization to enable CTC captures on poly(methyl methacrylate) (PMMA) substrates. Controlled amounts of carboxyl groups and polyethylene glycol (PEG) segments were introduced into the coating formulation to facilitate immobilization of antibodies and block non-specific protein adsorption, respectively. Then, anti-EpCAM antibodies were immobilized on functionalized, coated PMMA substrates by EDC/NHS chemistry. Multiple physical, chemical and biological properties were investigated, including hydrophilicity, protein adsorption, platelet adhesion and anticoagulant properties. Thereafter, optimized coatings were applied on the inner wall of PMMA tubes, followed by immobilization of anti-EpCAM antibodies. After perfusion of the tubes with whole blood, enriched with SGC7901 gastric cancer cells that overexpress EpCAM antigens, rapid and efficient capture of the tumor cells was observed. These results provide a basis for further development of devices for the selective capture and enrichment of CTCs, using small blood volumes.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Zhihao Chen,Jiyuan Jin,Xiaojie Song,Guoyang Zhang,Shujuan Zhang
Whether superoxide radical anion (O2•–) was a key reactive species in the oxidation of arsenite (As(III)) in photochemical processes has long been a controversial issue. With hydroquinone (BQH2) and 1,4-benzoquinone (BQ) as redox mediators, the photochemical oxidation of As(III) and reduction of nitrate (NO3–) was carefully investigated. O2•–, singlet oxygen (1O2), H2O2, and semiquinone radical (BQH•) were all possible reactive species in the irradiated system. However, since the formation of As(IV) is a necessary step in the oxidation of As(III), taking the standard reduction potentials into account, the reactions between the above species and As(III) were thermodynamically unfavorable. On the basis of radical scavenging experiments, hydroxyl radical (•OH) was proved as the key species that led to the oxidation of As(III) in the UV/BQH2 system. It should be noted that the •OH radicals were generated from the photolysis of H2O2, which came from the disproportionation of O2•– and the reaction of O2•– with BQH2. Both the photoejected eaq– from 1(BQH2)* and the direct electron transfer with 3(BQH2)* contributed to the reduction of NO3– in the UV/BQH2 process. No synergistic effect was observed in the redox conversion of As(III) and NO3–, further demonstrating that the role of BQH• was negligible in the studied systems. The results here are helpful for a better understanding of the photochemical behaviors of quinones in the aquatic environment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Feng Jiang,Bin Qiu,Dezhi Sun
Biological treatment is not completely effective for the removal of all refractory organics, including fulvic-like and humic-like substances, in fresh leachate from municipal solid waste (MSW) incineration. In this study, a UV/peroxymonosulfate (PMS) process was used to degrade the refractory pollutants that remained in the bio-treatment effluent. The reaction conditions were optimal when 10 g/L of PMS was used at a pH of 8.96. 70.6% of COD was degraded within 60 min with optimal reaction conditions. The refractory organics were degraded by the UV/PMS process, which generated intermediates with low molecular weight. The mechanisms involved in this advanced degradation process were uncovered by detecting the generation and conversion of radicals during the oxidation reaction.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yangyang Chen,Atian Xie,Jiuyun Cui,Jihui Lang,Yongsheng Yan,Chunxiang Li,Jiangdong Dai
Oil–water separation has received much attention worldwide due to increasing oily wastewater and frequent oil leak events. Herein, a superhydrophilic/underwater superoleophobic membrane (PF@PDA@TiO2) is synthesized by polydopamine (PDA) anchoring TiO2 nanowires on the surface of paper fibers (PF) via vacuum-assisted filtration technology for various efficient oil–water separations. The oil contact angle underwater of PF@PDA@TiO2 is about 156°, revealing its favorable underwater superoleophobic property. Remarkably, the PF@PDA@TiO2 affords a high separation efficiency of 99%. More importantly, the PF@PDA@TiO2 displays ultraviolet-driven superior antifouling performance even after 80 cycles. We believe that the low cost and superior antifouling PF@PDA@TiO2 will provide a striking application in oil–water separation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Li Dong,Xiangdong Liu,Zhengrong Xiong,Dekun Sheng,Yan Zhou,Changhong Lin,Yuming Yang
Herein, PVDF membranes with excellent UV-absorbing property were first synthesized through grafting the polymerizable low-molecular-weight organic UV-absorber 2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy) benzophenone (BPMA) onto α-bromoester-functionalized PVDF membranes via the surface-initiated activator generated by electron transfer atom transfer radical polymerization (SI-AGET ATRP). The surface initiators were immobilized by the reaction between 2-bromoisobutyryl bromide (BIBB) and the hydroxylated PVDF membranes. PVDF-g-PBPMA membranes with different grafting densities were obtained by tuning the polymerization time and the modified membranes were characterized by 1 H-NMR, FT-IR, XPS, SEM, UV–vis Spectrophotometer, TGA and DSC. The experimental results indicated that PBPMA chains were successfully introduced onto PVDF membranes. Most importantly, the PVDF-g-PBPMA membranes exhibited outstanding UV-shielding property. UV–vis transmittance spectra showed that most UV light below 360 nm could be absorbed by PVDF-g-PBPMA membranes and the whole UV light region (200–400 nm) can be blocked with the reaction time increased.
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高影响因子
Journal of Coatings Technology and Research
·
2017
·Vol. 15
·期 1
·149-158
·
IF 1.557
Yao Bolong,Zhao Haiping,Wang Likui,Liu Yun,Zheng Chunsen,Li Hongping,Sun Changqing
A dual-cure hydrophilic acrylate polymer was synthesized via radical polymerization with acrylic acid (AA), isophorone diisocyanate (IPDI), 2-acrylamide-2-methylpropane sulfonic acid (AMPS), hydroxyethyl acrylate (HEA), and 3-(trimethoxysilyl)propyl-2-methyl-2-methacrylate (MPS) as monomers, then used as prepolymer for antifog coating with tetraethylorthosilicate (TEOS) as a novel crosslinker. The prepolymer was mixed with crosslinking agent and photoinitiator to form coating formulas. The coating was characterized by nuclear magnetic resonance (NMR), Fourier-transform infrared (FTIR) spectroscopy, and contact angle measurements. The results indicated that the dosage of AMPS and TEOS had great influence on the antifog performance. With an increasing TEOS amount, the hardness, adhesion, water resistance, impact resistance, and thermal stability of the films were improved, at the expense of transparency; with increasing dosage of AMPS, the hydrophilicity of the film increased at the expense of water resistance. Optimum coating properties could be obtained when the amount of AMPS was 7% and that of TEOS was 5.5%. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) results showed that some SiO 2 microspheres were formed and microphase separation occurred between the macromolecular segments, yielding the excellent coating properties.
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Biomed Research International
·
2015
·
IF 1.579
Yan Ma,Kejia Zhang,Cong Li,Tuqiao Zhang,Naiyun Gao
The photocatalytic degradation of sulfonamides in aqueous TiO2 suspension under UV irradiation has been investigated using potassium ferrate as electron acceptors. The results showed that the stability of Fe(VI) is dependent on pH significantly, and the stability reduces obviously in the presence of UV-TiO2. The experiments indicated that Fe(VI) could effectively scavenge the conduction band electrons from the surface of TiO2. The photocatalytic oxidation of sulfonamides with Fe(VI) was found to be much faster than that without Fe(VI). The SD, SM, and SMX concentration was greatly reduced by 89.2%, 83.4%, and 82.0%, respectively, after 10 min with UV-TiO2-Fe(VI), comparing to 65.2%, 66.0%, and 71.9%, respectively, with Fe(VI) only in the dark and 71.3%, 72.7%, and 76.0%, respectively, with UV-TiO2. The pH value of solution significantly influenced the sulfonamides degradation in UV-TiO2-Fe(VI) system. The degradation amount of sulfonamides after 10 min was a maximum at pH 7. The intermediate products of sulfonamides oxidation by UV-TiO2-Fe(VI) were analysed by LC-HESI-MS-MS and the results suggested that a majority of sulfonamides turned into large-molecule products without complete mineralization.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 110
·90578-90587
·
IF 3.84
Xiaohui Li,Kaiqiang Zhang,Yunhui Zhao,Kongying Zhu,Xiaoyan Yuan
UV-curable films composed of thiol-terminated fluorosilicone methacrylate triblock copolymers (PDMS-b-(PFMA-SH)2), thiol-functionalized PDMS (PDMS-SH) and octavinyl POSS (OVPOSS) were developed for the purpose of icephobic application. The PDMS-b-(PFMA-SH)2 copolymers were firstly synthesized via reversible addition–fragmentation chain transfer polymerization of dodecafluoroheptyl methacrylate (12FMA) or 2-perfluorooctylethyl methacrylate (17FMA), and followed by thiol-modification of the end groups. The results of differential scanning calorimetry and X-ray diffraction revealed the presence of perfluoroalkyl side groups in P17FMA as presented in the crystalline structure. These endowed the P17FMA-containing films with higher receding contact angles (100.2–113.5°) as compared with the P12FMA-containing films. In icephobicity investigations of the prepared films, it was found that the rebound of the impacting droplet was influenced by the receding contact angle, surface roughness, and temperature of the film surface. Water droplets could rebound from the horizontal and tilted (30° and 45°) P17FMA-containing film surfaces down to −15 °C, allowing surface dewetting before the water droplets froze, while the droplets adhered to the P12FMA-containing film surfaces. Moreover, the ice shear strengths of all the prepared film surfaces were lower than 210 kPa, only about 15% of the value on the bare aluminum surface. Therefore, P17FMA-containing UV-curable films could be a potential candidate for icephobic applications.
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高影响因子
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