Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Longqian Wang,Jingya ye,Jingyi Zhang,Qinglong Meng,Xiaoyu Li,Zhonglin Chen,Huahu Yu,Ao Zhang,Zhuoyu Bu,Yongli Jiao,Yuwei Pan
Peracetic acid (PAA) was successfully activated by UV and Fe 0 to degrade sulfamethazine (SMT) in this study. UV/Fe 0 /PAA system not only could enhance SMT removal efficiency but also could reduce the energy consumption in comparison with UV, Fe 0 /PAA and UV/PAA systems. The R O • radical was the main radical for the degradation of SMT in UV/Fe 0 /PAA system and photolysis, • OH and R-O • exhibited 15.6%, 17.6% and 66.8% contribution for SMT degradation, respectively. Fourier transform infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM), and X-ray photoelectron spectroscopy (XPS) were conducted to investigate the characterization of Fe 0 after reaction in UV/Fe 0 /PAA system. The possible SMT degradation pathway was also proposed. Affecting factors such as Fe 0 dosage (0–0.2 g L −1 ), PAA concentration (0–200 μM) and initial pH (3–9) were also studied. Cl − , NO 3 - , SO 4 2- and HCO 3 - had a negligible adverse effect on SMT removal in this system indicating the good adaptability to inorganic ions. In addition, UV/Fe 0 /PAA system had the good recycle ability of Fe 0 and showed a good performance in removing antibiotic in the nature fresh water. Therefore, this study notably improved the knowledge of PAA activated by Fe 0 and UV and showed the potential applicability of UV/Fe 0 /PAA system in degrading antibiotics in nature fresh water.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Mengtian Yu,Dongpo He,Yuhang Zhang,Dahao He,Xing Wang,Jinghui Zhou
Acanthopanax senticosus has been used to extract active products. However, abundant Acanthopanax senticosus residues (ASR), which contain plenty of lignin are discarded after extraction. An appropriate extraction method should be chosen to obtain the lignin with such desirable properties. Thus, this study investigated the effect of alkali, milled wood, deep eutectic solvent and ethanol methods on the lignin. Lignin obtained from different extraction methods were characterized, yields, chemical structure, thermal behavior, molecular weight and phenolic content were evaluated. The results show that the process of lignin acquisition has a great influence on the properties of lignin. Moreover, the multifarious functional groups exist in lignin macromolecules , such as phenolic, ether groups and other chromophores, conferred good UV resistance to lignin. Among them, the lignin from alkali method has the most phenolic-OH groups and smallest molecular weight result in a good UV-resistant, the SPF value achieves 2.39 at 1% AL content, the alkali method was the best way to make sunscreen blended with cream take various factors into consideration. This study used lignin as a bioactive ingredient to provide UV-resistant property to sunscreen formulations. Furthermore, lignin extracted from Acanthopanax senticosus residue provides a new application for the treatment of herb residue waste.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Kangren Niu,Kuiyan Song
To prevent the degradation of wood surfaces by ultraviolet radiation and liquid water, modified polyethylene wax and modified polyethylene wax/oxidized paraffin composite wax were used for the protection of wood surfaces with hot wax treatment. The effects of natural beeswax coating and modified synthetic wax coating on wood surface aging behavior were also studied. Results showed that changes in color, gloss, water uptake, contact angle, micro-morphology, and chemical changes of wood treated with modified synthetic wax hot waxing were less than those of wood treated with natural beeswax hot waxing after long-term aging under ultraviolet (UV) light and water. Among them, the modified polyethylene wax/oxidized paraffin composite wax coating showed the best protective effects on the wood surface, and the composite wax coating reduced the UV penetration and enhanced the UV oxidative degradation resistance. In addition, the synergistic effect of modified polyethylene wax and oxidized paraffin further reduced the water uptake of wood during aging process. This data clearly shows that the modified synthetic wax and composite wax coating can effectively inhibit the photooxidative degradation of wood surface, provide a lasting hydrophobic protection effect on wood, and show long-term photostability.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yuchun Li,Jinzhao Wang,Boqiong Xue,Shuheng Wang,Peng Qi,Jun Sun,Hongfei Li,Xiaoyu Gu,Sheng Zhang
An integrated multi-functional additive was fabricated by successively grafting melamine (MEL) and phytic acid (PhA) on multiwalled carbon-nanotubes (MWNCTs), and was then applied in PA6 to improve the flame retardancy and light aging resistance of the composite. The limit oxygen index of PA6 composite containing 7 wt% PhA-MEL-MWCNTs was increased to 26.4 from 21.0. The smoke and CO release were significantly reduced by 48% and 88% respectively, and the severe melt dripping of PA6 in burning was eliminated. It is proved that PhA-MEL-MWCNTs can absorb ultraviolet (UV) radiation, and hence significantly reduces the mechanical property loss of the PA6 composite after UV aging. The tensile strength of the aged PA6/7 wt%PhA-MEL-MWCNTs composite sample only decreased by 18.1%, which was significantly lower than the loss rate of the control aged PA6 sample (62.5%). This protocol provides a new opportunity for fabricating long-life flame retardant polyamide composites.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Yansong Liu,Jiayue Zhang,Yuanlin Ren,Guoli Zhang,Xiaohui Liu,Hongqiang Qu
In order to endow polyacrylonitrile (PAN) fabric with excellent thermal and flame retardant properties, glycidyl methacrylate (GMA) was grafted on the surface of PAN fabric by UV-induced grafting technology to obtain GMA grafted PAN fabric (PAN-g-GMA). Next, L-Arginine was introduced to PAN-g-GMA (PAN-g-GMA/Arg) through the reaction of the amino groups in L-Arginine and the epoxy groups in GMA units. Then the flame retardant PAN fabric (FR-PAN) was prepared via the phosphorylation of PAN-g-GMA/Arg. When the grafting percentage was up to 13.5 wt%, the residual char of FR-PAN at 800 °C reached 51.6 wt%, indicating improved thermal stability. In addition, compared to PAN sample, the peak of heat release rate (PHHR) and total heat release (THR) of FR-PAN were remarkably decreased by 36.3% and 8.1% respectively, demonstrating excellent flame retardancy. Moreover, the elongation at break of FR-PAN fabric was increased by 53.6%. The cyclization of PAN induced by phosphoric acid reduced the chain breakage and inhibited the degradation of PAN. Moreover, the introduced amino acids delayed the release of HCN and other pyrolysis volatiles, meanwhile, the released NO and other non-combustible gases prevented oxygen from entering the combustion zone. This work presents a facile strategy for the application of amino acid materials in flame retardant PAN materials.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Mingran Wang,Qianyu Wang,Yanping Cai,Rongfang Yuan,Fei Wang,Yiguang Qian,Zhongbing Chen,Beihai Zhou,Huilun Chen
Perfluorobutyric acid (PFBA) has been used more and more in recent years and also can be generated by the degradation of long-chain perfluorinated compounds (PFCs). PFBA is refractory and has various toxic effects on the human body, such as reproductive toxicity and hepatotoxicity. Therefore, the removal of PFBA from the environment effectively has become a very urgent issue. This study successfully applied an ultraviolet-activated persulfate (UV/PS) system to remove PFBA (50 μM, 120 mL). We found that a high decomposition ratio (88.0%) and defluorination ratio (39.6%) can be achieved under an initial pH of 2.00 ± 0.02 within 5 h at room temperature. Quenching test and electron paramagnetic resonance spectrum of active species were conducted to develop the proposed mechanism for PFBA oxidation , and they depicted PFBA lost CF 2 unit step by step to form short-chain intermediates (PFPrA and TFA) and F − , which became H 2 O and CO 2 eventually. Sulfate radical (SO 4 •- ) and hydroxyl radical (•OH) play key roles in the degradation of PFBA. The lower initial pH under acidic conditions and the higher pH under alkaline conditions can accelerate the degradation of PFBA by affecting the active species in the system. Higher persulfate doses or greater light intensity resulted in a faster PFBA degradation. Meanwhile, the inhibitory effect of Cl − on the decay of PFBA was significant, while other coexisting anions (CO 3 2− , SO 4 2− , F − ) and humic acid had a slight influence. To the best of our knowledge, this is the first report for systematic studying the efficient degradation and defluorination of PFBA. This paper will guide the follow-up research on the degradation of short-chain perfluorinated compounds.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Changyang Li,Peng Wang,Dun Zhang
Bioinspired superhydrophobic surfaces (SHS) have potential application prospects in many fields, but weak mechanical stability of the microstructures has become the main bottleneck. In this work, the water-glass strengthened the interfacial force between the inorganic SiO 2 and ZnO particles and the substrate through chemical reaction rather than physical embedding, which obtains a robust superhydrophobic surface. Based on surface characterization and analysis, the mechanism of the water-glass that played a role of enhancing the interface between the particles and the substrate in the coating was explored and proposed. Furthermore, the effect of the treatment temperature on the surface structure of the water-based paint during the spraying process was studied. Through simulating different environments, the anti-acid and -alkali resistance and anti-aging ability were tested in the full pH range or under strong UV irradiation , showing an excellent performance. Different mechanical stability tests confirmed that the silicate network structure enhances the binding force between the particles, improving the robustness of the superhydrophobic surface. This work may provide a new insight for the construction of superhydrophobic surfaces with enhanced interfaces.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Shenglan Liu,Yongsheng Fu,Guangsheng Wang,Yiqing Liu
In this study, the degradation efficiency and mechanism of sulfamethoxazole (SMX) by UV/sulfite system in presence of oxygen were investigated systematically. The results indicated that SMX could be effectively removed by UV/sulfite following a pseudo first-order kinetic model. Compared to SMX photolysis under UV irradiation, its removal in UV/sulfite system was significantly enhanced, which was mainly ascribed to the formed reactive oxygen species. Sulfate radical (SO 4 − ) was proved to be the major active radical for SMX degradation by scavenging experiments using methanol and tert -butanol as scavengers. UV photolysis and radical oxidation were two degradation pathways of SMX in UV/sulfite system, and their contribution to SMX removal at pH 6.9 was 38.8% and 61.2%, respectively. The degradation rate constant of SMX was decreased from 0.1415 to 0.0358 min −1 as the pH increased from 4.0 to 9.3, because pH is an important influence factor on species distribution of both SMX and S(Ⅳ), further influencing direct SMX photolysis and formation of active species. SMX degradation was increased with the increase of S(IV) concentration from 0 to 1000 μM, while it was decreased with the increase of initial SMX concentration. The presence of HCO 3 − , Ca 2+ and fulvic acid inhibited the degradation of SMX in UV/sulfite system, while an insignificant effect on SMX removal was observed with the addition of Cl − , SO 4 2− and Cu 2+ . NO 3 − could facilitate SMX degradation in UV/sulfite process as a precursor to form hydroxyl radical. Under the direct UV photolysis and radical oxidation, five degradation products of SMX were produced by hydroxylation, S–N bond cleavage of sulfonamide, and oxidation of amino group. Consequently, UV/sulfite could be an efficient approach for SMX removal from polluted water.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Dangli Gao,Yuqian Liang,Jie Gao,Hong Xin,Long Wang,Sining Yun,Xiangyu Zhang
Applications of rare-earth (Re)-doped upconversion (UC) micro/nanocrystals in varying areas have sparked a growing, constant demand for deliberate control over the luminescent profile and lifetime. A general strategy for adjusting UC luminescence is to control the dopant Re 3+ concentration. However, the progress of elevating dopant concentration is significantly limited owing to frequently encountering severe concentration quenching. Herein, by designing UC system using Tm 3+ with super long intermediate energy level lifetime and Yb 3+ with a simple two-level structure as a activator/sensitizer combination, we have achieved the unusually intense deep ultraviolet (UV) UC emissions at 290 nm and 345 nm, near UV emission at 361 nm, visible blue emissions at 452 nm and 478 nm, and near infrared (NIR) emission at 803 nm in NaYF 4 :Yb/Tm microtubes under 980 nm excitation. The luminescence intensity reaches about 56 times and 8 times enhancement for the UV and blue emission, respectively, with the increase of dopant Yb 3+ contents from 20 to 80 mol%. While luminescence lifetimes for all emissions decrease, particularly, for NIR emission at 803 nm, from 1507 μs down to 384 μs. Importantly, upon 980 nm irradiation, these UC NaYF 4 :Yb/Tm microtubes exhibit superior optical performance as a promising candidate of advanced anti-counterfeiting applications and other applications including UV light triggered reactions and multiplexing information storage.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 9
·2165
·
IF 3.426
Jijun Tang,Jinshuai Zhang,Jianyu Lu,Jia Huang,Fei Zhang,Yun Hu,Chengguo Liu,Rongrong An,Hongcheng Miao,Yuanyuan Chen,Tian Huang,Yonghong Zhou
Novel oil-based epoxy acrylate (EA)-like prepolymers were synthesized via the ring-opening reaction of epoxidized plant oils with a new unsaturated carboxyl acid precursor (MAAMA) synthesized by reacting maleic anhydride (MA) with methallyl alcohol (MAA). Since the employed epoxidized oils including epoxidized soybean oil (ESO), epoxidized rubber seed oil (ERSO), and epoxidized wilsoniana seed oil (EWSO) possessed epoxy values of 7.34–4.38%, the obtained epoxy acrylate (EA)-like prepolymers (MMESO, MMERSO, and MMEWSO) indicated a C=C functionality of 7.81–4.40 per triglyceride. Furthermore, effects of the C=C functionality and the addition of hydroxyethyl methacrylate (HEMA) diluent on the ultimate properties of the resulting UV-cured EA-like materials were investigated and compared with those of commercially available acrylated ESO (AESO) resins. As the C=C functionality increased, the storage modulus at 25 °C (E’25), glass transition temperature (Tg), 5% weight–loss temperature (T5), tensile strength and modulus (σandE), and hardness of the coating for both the pure EA and EA/HEMA resins increased significantly as well. These properties indicated similar trends when comparing the EA materials with 30% of HEMA with those pure EA materials. Specially, although ERSO had a clearly lower epoxy value that ESO, both the UV-cured pure MMERSO and MMERSO/HEMA materials showed much betterE’25,Tg,σ, andEthan their AESO counterparts, indicating that the MAAMA modification of epoxidized plant oils was much more effective than the modification of acrylic acid to achieve high-performance oil-based epoxy acrylate resins.Keywords:soybean oil;rubber seed oil;wilsoniana seed oil;epoxy acrylate;UV-curable coatings
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 6
·4212-4224
·
IF 3.553
Sheng Xinxin,Li Sihao,Huang Haowei,Zhao Yanfeng,Chen Ying,Zhang Li,Xie Delong
Abstract In this work, Ti 3 C 2 MXene, a novel two-dimensional nanosheet, was introduced to waterborne polyurethane (WPU) coatings to prepare a composite coating. First, MAX phase materials were in situ etched by HF acid and further intercalated by water molecules to obtain exfoliated single-layer MXene nanosheet. And then, composite coatings were prepared via solution-blending low addition (0–0.4 wt%) of MXene, self-prepared waterborne polyacrylate emulsion (PAE) and isocyanate hardener, applying on Q235 mild steel. Results of AFM, XRD SEM and SEM–EDS confirm that single-layer MXene nanosheets with large lateral-to-thickness ratio are successfully prepared and achieved homogenous distribution within WPU matrix. With 0.4 wt% MXene incorporated, the WPU/Ti 3 C 2 MXene composite coatings reach a lowest corrosion current of 2.143 × 10 –6 A/cm 2 , a decrease of one order of magnitude compared with blank WPU (1.599 × 10 –5 A/cm 2 ) and own an excellent UV-blocking property (almost block the whole UV light). Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Haichang Ding,Baoqiang Li,Zonglin Liu,Gang Liu,Shouzhi Pu,Yujie Feng,Dechang Jia,Yu Zhou
Injectable chitosan hydrogels exhibit excellent biological properties for application in biomedical engineering, however most of these hydrogels have limited applicability because “Swelling” can induce volume expansion of conventional hydrogels implanted in the body damages the surrounding tissues. Here, we report a new “Nonswelling” pentenyl chitosan (PTL-CS) hydrogel via N‒acylation reaction to graft an UV crosslinkable short hydrophobic alkyl chain ( n ‒pentenyl groups). The incorporated pentenyl groups can be crosslinked by UV irradiation to form hydrophobic chains via combination termination, which generate strong hydrophobic effect to extrude the excess water in hydrogel, resulting in a “Nonswelling” state at biological temperature. Furthermore, the PTL-CS solution showed no cytotoxicity in vitro and minimally invasive treatment in vivo demonstrated the PTL-CS hydrogel no adverse effects in a rat model. The nonswelling injectable and UV crosslinkable chitosan hydrogel hold potential applications in smart biomaterials and biological engineering as well as providing a new natural hydrogel in minimally invasive tissue engineering..
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）