CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Dongyu Wang,Ting Chen,Yong Zeng,Xianfu Chen,Weihong Xing,Yiqun Fan,Xu Qiao
The design and construction of gradient pore structures are effective in the preparation of high-performance ceramic membranes . In this study, ceramic microfiltration membranes with tertiary gradient structures were obtained by combining 3D printing with dip-coating technology based on a UV-curable alumina suspension. Millimeter-scale pyramid-type microporous structures formed by coarse-particle stacking were used in the support, while submicron pore structures formed by the accumulation of fine particles were employed in the membrane layer. The optimized ceramic support had an effective pore size of 1.02 μm and pure water permeance of 1850 L·m −2 h −1 ·bar −1 . After the deposition of the membrane layer, the effective pore size was significantly reduced to 109 nm, while the pure water permeance remained as high as 1050 L·m −2 h −1 ·bar −1 . Additionally, ceramic microfiltration membranes exhibited good performance in the separation of nanoparticles from water suspensions.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 31
·15064-15070
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IF 3.925
Zhendong Yan,Yang Wang,Ting Li,Pengwu Xu,Jing Huang,Jie Jiang,Xuhui Zhang,Bihua Xia,Shibo Wang,Weifu Dong
Nanoparticles with ultraviolet/near-infrared (UV/NIR) shielding ability have great potential in the application research of energy-saving materials. In this study, we prepared dual-functional UV/NIR-shielding poly(lactic acid) (PLA) composite films. Firstly, CsxWO3@polydopamine (CWO@PDA) nanoparticles with core–shell structures were formed by dopamine self-polymerization on the surface of CWO, and then CWO@PDA-g-PLLA nanoparticles were successfully prepared by ring-opening polymerization with L-lactide as a raw material. Finally, PDLA/CWO@PDA-g-PLLA composite films containing different proportions of CWO@PDA-g-PLLA nanoparticles were fabricated via a solvent casting method. The results showed that these films have an excellent UV shielding performance and strong absorption in the NIR region (800–2500 nm). When 1.5 wt% of CWO@PDA-g-PLLA nanoparticles was added, the near-infrared transmittance of the composite films decreases significantly from 79.7% to 29.8%. More importantly, the nanoparticles can be used as a heterogenous nucleator to enhance the HC crystallization of PDLA and form stereocomplex crystallites between PDLA and CWO@PDA-g-PLLA nanoparticles which improved the mechanical properties. This study provided a new method for the preparation of PLA nanocomposites with excellent UV/NIR shielding function. These nanocomposites are promising for practical application on energy-saving windows.
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Journal of Natural Fibers
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2022
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IF 3.507
Yankun Yin,Zhiyu Huang,Pei Wang,Zongmin Zhu,Jing Xu,Shaohua Chen,Hua Wang
An ultraviolet (UV)-protective cotton fabric has been developed by combining tannic acid and copper ions (TA-Cu) on cotton fabrics. The structure and properties of TA-Cu and cotton fabrics finished with TA-Cu were characterized by Fourier-transform infrared spectroscopy, ultraviolet-visible spectroscopy, scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The UV resistance and laundering durability of modified cotton fabrics were measured. The cotton fabric finished with tannic acid showed a maximum UV-protection factor value of 44.5, which was further improved by chelation with copper ions. The cotton fabric finished by the TA-Cu exhibits a UV-protection factor value of up to 172.1 and a UV transmittance of less than 1.5% when the concentration of tannic acid and copper ions was 0.1 mmol/L. The as-prepared cotton fabrics retained their UV resistance after laundering. This study proposes an eco-friendly anti-UV treatment for cotton fabrics and a novel application for tannic acid and copper ions to imbue fabrics with UV protection.
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WATER AIR AND SOIL POLLUTION
·
2021
·Vol. 232
·期 9
·1-13
·
IF 2.52
Li Qiuyue,Huang Kaibo,Duan Xingchun,Liang Jiahao,Chen Xinran,Tao Xueqin,Lu Guining
In this research, the feasibility of UV/Fe(III) photocatalytic technology for the degradation of tris (2-chloroethyl) phosphate (TCEP) was investigated. Experimental results showed that TCEP had a significant removal efficiency in UV/Fe(III) ([TCEP] 0 = 10 ppm, [Fe 2 (SO 4 ) 3 ] 0 = 0.5 mM, near-100% degradation rate after 90 min). A free radical scavenging experiment and EPR detection indicated that the formation of ·OH by the Fe(III) under ultraviolet light played a major role. Experiments on influencing factors revealed that oxygen accelerated the degradation of TCEP by accelerating the Fe(II)/Fe(III) cycle, but Cl − and PO 4 3− inhibited TCEP degradation. Three intermediate products were generated, including C 4 H 9 Cl 2 O 4 P (product A, m/z 222.9690), C 6 H 13 Cl 2 O 5 P (product B, m/z 266.9954), and C 2 H 6 ClO 4 P (product C, m/z 160.9762). Moreover, the degradation pathways primarily involved the C–Cl bond and phosphoric center being attacked. Escherichia coli toxicity test revealed that UV/Fe(III) treatment reduced environmental risk of TCEP. Therefore, UV/Fe(III) photocatalysis is a promising technique for TCEP control in wastewater treatment. Graphical abstract
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POLYMER INTERNATIONAL
·
2021
·Vol. 71
·期 2
·227-231
·
IF 2.99
Xuejun Duan,Heng Chen,Huan Liu,Ming Chen,Shaojun Chen,Jihua Gao
A new bioadditive for poly(vinyl chloride) (PVC), diethylhexyl thiazolopyridine dicarboxylate (BTD), was designed and synthesized by the esterification between 2-ethylhexanol and thiazolopyridine dicarboxylic acid. The chemical structure of BTD was characterized by Fourier transform infrared spectroscopy and NMR. As a main plasticizer, BTD had higher plasticizing efficiency, thermal stability and migration resistance than dioctyl phthalate. Furthermore, due to the thiazolopyridine conjugated structure, BTD possessed strong ultraviolet (UV) absorption that endowed its plasticized PVC film with excellent UV shielding property. The biomass resource combined with the above high performances make BTD a very promising additive for PVC plasticization and anti-UV application. © 2021 Society of Industrial Chemistry.
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CHEMOSPHERE
·
2021
·
IF 7.086
Jun Hu,Tong Li,Xuxiang Zhang,Hongqiang Ren,Hui Huang
Steroid estrogens (SEs) are a group of refractory organic micropollutants detected in secondary effluent frequently. The advanced oxidation processes (AOPs) are usually used to deep remove the SEs from the secondary effluent. Herein, we first investigated the UV/peracetic acid (PAA), a PAA-based AOP, to degrade SEs. Using estrone (E1), 17β-estradiol (E2), estriol (E3), and 17α-ethinyl estradiol (EE2) as representatives, the results showed that UV can effectively activate PAA to enhance the degradation of the four SEs, which degradation followed the pseudo-first-order kinetics (R 2 > 0.99), and the rate constant ( k obs ) of degradation increased with increasing the PAA dosage in the range investigated. Little pH dependence was also observed in the degradation of SEs by UV/PAA. Furthermore, the degradation of SEs was improved in the presence of coexisting substrates (Cl − , HCO- 3, NO- 3, and HA) in relatively low concentrations. Quenching experiments revealed that the carbon-centered radicals (R–C•) produced from the UV/PAA process were recognized as the predominant contributors to the degradation of the four SEs. Also, we found that the estrogenic activity decreased by more than 94%, but the acute toxicity inhibition increased to 37% in the solution after 30 min UV/PAA treatment. In addition, the 130% additional total organic carbon (TOC) was generated after UV/PAA process. These findings obtained in this work will facilitate the development of the UV/PAA process as a promising strategy for the deep removal of SEs in secondary effluent.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Wei,Guanglu Lu,Dongrun Xie,Tianyi Sun,Yu Liu,Ying Zhang,Jiutao An,Menghong Li,He Guo
Enrofloxacin (ENRO) as a highly toxic antibiotic poses great threats to human health and environmental safety. In this study, a novel technology of coupling dielectric barrier discharge (DBD) and ultraviolet (UV) was investigated to efficiently degrade ENRO in aqueous, and had a higher degradation rate. The ENRO degradation rate achieved approximately 93.9% at 30 min, and approximately 1.20 g kWh −1 of energy yield (G 50 ) was observed for the combined system. The addition of H 2 O 2 and K 2 S 2 O 4 improved the ENRO degradation due to the generation of ·OH and ·SO 4 2- . In the presence of NO 3 – , the ENRO degradation played a tendency to promote first and then decrease, and the presence of SO 4 2- resulted in the positive effect, while the negative effect was shown in the presence of Cl - and CO 3 2– . The trapping experiment indicated that ·OH played an important part in the ENRO degradation. The addition of UV into the DBD system decreased H 2 O 2 concentration in deionized water, and increased ·OH concentration. The DFT analysis showed the degradation mechanisms of ENRO at a molecular level. The degradation of ENRO mainly involved the oxidation of the piperazine group, the removal of ethyl acetate and the substitution of the F atom. The toxicity of ENRO and its degradation intermediates was evaluated.
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POLYMER TESTING
·
2021
·
IF 4.282
Jinqing Huang,Yahong Xiong,Xiaohua Zhou,Zhuohong Yang,Teng Yuan
In recent decades, the sustainability, availability and low toxicity of biomass polyols have attracted more and more attention. Biomass polyols were used to prepare polyfunctional polyurethane acrylates, which can effectively improve the green performance of UV-curable coatings. Herein, a multifunctional polyurethane acrylate containing a variety of biomass was synthesized and characterized. Firstly, itaconic acid (IA), ricinoleic acid (RA) and oleic acid (OA) reacted with glycidyl methacrylate (GMA) respectively to obtain itaconic acid acrylate (IAG), ricinoleic acid acrylate (RAG) and oleic acid acrylate (OAG). Determination of the synthesis of IAG, RAG and OAG was conducted by proton nuclear magnetic resonance ( 1 H NMR) and Fourier transform infrared spectroscopy (FTIR). Then IAG, RAG, OAG and castor oil (CO) were mixed and reacted with isophorone diisocyanate (IPDI) to prepare polyurethane acrylate. The effects of IAG, RAG, OAG and CO on the thermal and mechanical properties of polymers were studied. The results showed that when the content of IAG was increased, the double bond conversion rate, the glass transition temperature, tensile strength, Young's modulus and gel content of polyurethane increased significantly. In addition, by adjusting the contents of IAG, RAG, OAG and CO, the thermal stability of polymers also showed regular changes. Among them, the thermal stability of polymers increased most with the increase of IAG content, followed by RAG, OAG and CO.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Jiale Li,Wenjing Qi,Yameng Li,Sumin Jiao,Hao Ling,Peng Wang,Xin Zhou,Khumal Sohail,Guangcai Wang,Guofu Hou,Jingshan Luo,Ying Zhao,Liming Ding,Yuelong Li,Xiaodan Zhang
Metal halide perovskite-based solar cells (PSCs) have rapidly-increased power conversion efficiency (PCE) exceeding 25% but poor stability especially under ultraviolet (UV) light. Meanwhile, non-radiative recombination caused by diverse defects in perovskite absorbers and related interfaces is one of the major factors confining further development of PSCs. In this study, we systematically investigate the role of 2-(2-hydroxy-5-methylphenyl)benzotriazole (UVP) additive in perovskite layers. By adjusting the amount of doped UVP, the quality of perovskite absorbers is significantly improved with enlarged grains, longer lifetime and diffusion length of charge carriers. Furthermore, UVP not only reduces defects for less non-radiative recombination, but also matches energy level alignment for efficient interfacial charge extraction. X-ray photoelectron spectroscopy confirms that N-donor of UVP molecule coordinates with undercoordinated Pb 2+ on the surface. Interestingly, UVP incorporated in PbI 2 protects the perovskite by absorbing UV through the opening and closing of the chelating ring. Eventually, the UVP treated PSCs obtain a champion PCE of 22.46% with remarkably enhanced UV stability, retaining over 90% of initial PCE after 60 mW/cm 2 strong UV irradiation for 9 h while the control maintaining only 74%. These results demonstrate a promising strategy fabricating passivated and UV-resistant perovskite materials simultaneously for efficient and stable perovskite photovoltaics.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·14128-14136
·
IF 2.478
Song Fengmin,Zhang Gongguo
A series of double-perovskite orange–red-emitting Ca (3−2 x ) Sm x Na x TeO 6 ( x = 0.01–0.25) phosphors have been synthesized via high-temperature method. The single-phase and orthorhombic structure of Ca 3 TeO 6 :Sm 3+ , Na + phosphors was confirmed by X-ray powder diffraction. Under 405 nm excitation, Ca 3 TeO 6 :Sm 3+ , Na + phosphors emitted a series of orange–red emission due to the transition of Sm 3+ from 4 G 5/2 to 6 H J/2 ( J = 5, 7, 9, and 11). The optimal Sm 3+ -doping concentration of Ca (3−2 x ) Sm x Na x TeO 6 ( x = 0.01–0.25) was x = 0.10. The thermal-quenching temperature of Ca 3 TeO 6 :0.10Sm 3+ , 0.10Na + phosphor was above 480 K. A white light-emitting diode (w-LED) based on 410 nm UV chip was successfully fabricated, and it presented a good correlated color temperature and a high color-rendering index (R a ). Therefore, orange–red-emitting Ca 3 TeO 6 :Sm 3+ , Na + phosphors have potential applications in UV-based w-LEDs.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yang Jiang,Kai Dong,Jie An,Fei Liang,Jia Yi,Xiao Peng,Chuan Ning,Cuiying Ye,Zhong Lin Wang
Equipping wearable electronics with special functions will endow them with more additional values and more comprehensive practical performance. Here, we report an ultraviolet (UV)-protective, self-cleaning, antibacterial, and self-powered all-nanofiber-based triboelectric nanogenerator (TENG) for mechanical energy harvesting and self-powered sensing, which is fabricated with Ag nanowires (NWs)/TPU nanofibers and the TiO2@PAN networks through a facile electrospinning method. Due to the added TiO2 nanoparticles (NPs), the TENG presents excellent UV-protective performance, including the ultraviolet protection factor (UPF) of ∼204, the transmittance of UVA (TUVA) of ∼0.0574%, and the transmittance of UVB (TUVB) ∼0.107%. Furthermore, under solar lighting for 25 min, most surface contamination can be degraded, and the decreased power output would be recovered. Owing to the coupled effects of TiO2 NPs and Ag NWs, the TENG shows excellent antibacterial activity against Staphylococcus aureus. Due to the micro-to-nano hierarchical porous structure, the all-nanofiber-based TENG can serve as self-powered pedometers for detecting and tracking human motion behaviors. As a multifunctional self-powered device, the TENG prompts various applications in the fields of micro/nanopower sources, human movement monitoring, and human–machine interfaces, potentially providing an alternative energy solution and a multifunctional interactive platform for the next-generation wearable electronics.
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高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
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2021
·
IF 1.99
Ya Wang,Chaonan Li,Xin Zhang,Wei Chen,Xiaogang Li
Controlled-release formulations (CRFs) have potential applications in modern agriculture, for it can not only prolong the duration of agrochemicals but also alleviate the adverse effect on non-target organism. In this study, we constructed pyraclostrobin@SiO2@polydopamine microcapsule (Pyr@SiO2@PDA MC). The resulting microcapsule is a near-rod shape (about 1.15 μm), which has a drug-loading efficiency of 55%. Fourier transform infrared (FTIR) and thermogravimetric analysis (TG) revealed the successful entrapment of the pesticide. The coating of polydopamine (PDA) endowing the microcapsule with superior UV-shielding properties than pyraclostrobin@SiO2 microcapsule (Pyr@SiO2 MC). Compared with pyraclostrobin emulsifiable concentrate (EC), the Pyr@SiO2@PDA MC exhibited 9.07-, 5.50-, 4.93- and 4.16-fold higher fungicidal activity against Rice blast fungus (Pyricularia oryzae) at concentrations of 0.5, 1, 2 and 4 mg/L. Moreover, acute toxicity tests demonstrated that the sample on zebrafish with lower toxicity on the first day. These results showed that the obtained microcapsule may process broader application potential in agriculture.
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