SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Feilong Dong,Qiufeng Lin,Cong Li,Liping Wang,Andreina García
The disinfection of algal-impacted surface waters results in high concentrations of disinfection byproducts (DBPs). Here, the formation of DBPs when water containing Pseudanabaena limnetica ( P. limnetica ) was disinfected combining chlorination and ultraviolet irradiation (UV) was investigated. Because of UV/chlorination to inhibit algal growth and reduce DBP formation effectively, the effects of UV doses, free chlorine doses, reaction time and pH on the formation of DBPs during UV/chlorination were studied. The results showed that higher UV dose, longer oxidation time, neutral and acidic pH were beneficial in controlling DBPs. Moreover, UV/chlorination could enhance the formation of brominated DBPs, and reduce the formation of chlorinated DBPs in algal solutions containing bromide. In addition, the DBP formation from intracellular and extracellular organic matter (IOM and EOM, respectively) derived from algae was compared. Finally, the economic efficiency of our system using the electrical energy per order (EE/O) was evaluated, which was calculated to be 18.68 kWh/m 3 during the reaction. This information indicated that UV/chlorination was a feasible treatment method for algal-rich water.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 12
·6804-6817
·
IF 3.361
Yunlan Peng,Hongle Shi,Zhenran Wang,Yongsheng Fu,Yiqing Liu
Diclofenac (DCF) is a common non-steroidal anti-inflammatory drug, which is frequently detected in different environmental media such as surface water, groundwater, domestic sewage, and sediment. In this study, UV-activated peroxymonosulfate (PMS) was used to degrade DCF by generating active radicals (i.e., SO4˙− and HO˙) with strong oxidizing properties. The effects of PMS dosage, pH, initial DCF concentration and common water constituents on the removal of DCF as well as its degradation mechanism in UV/PMS system were investigated. Compared to UV alone and PMS alone systems, DCF was removed more efficiently in the UV/PMS system at pH 7.0 due to the contribution of SO4˙− and HO˙, and its degradation followed the pseudo-first order kinetic model. As the dosage of PMS or solution pH increased, the degradation efficiency of DCF was gradually enhanced. The highest DCF degradation was obtained at pH 11.0 in this study, because the molar absorption coefficient of PMS increased with increasing pH at 254 nm resulting in generation of more reactive radicals at high pH. Removal efficiency of DCF was decreased significantly with the increase in its initial concentration due to the insufficient concentration of radicals. The presence of HCO3− and NO3− could promote the degradation of DCF because of the role of carbonate radicals and extra HO˙ formed, respectively, while NOM inhibited DCF degradation due to its competition with DCF for reactive radicals. No obvious influence on DCF degradation was observed in the UV/PMS system with the addition of Cl− and SO42−. The degradation of DCF by UV/PMS in real waters was slightly suppressed compared with its removal in ultrapure water. Seven transformation products were detected using UPLC-QTOF/MS, and the potential degradation mechanism of DCF was thus proposed showing six reaction pathways including hydroxylation, decarboxylation, dechlorination–cyclization, formylation, dehydrogenation and dechlorination–hydrogenation.
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PubMed
高影响因子
Nanoscale Advances
·
2020
·Vol. 2
·期 3
·1333-1339
·
IF 0
Ye Zhang,Qi You,Weichun Huang,Lanping Hu,Jianfeng Ju,Yanqi Ge,Han Zhang
It is widely known that the excellent intrinsic electronic and optoelectronic advantages of bismuthene and tellurene make them attractive for applications in transistors and logic and optoelectronic devices. However, their poor optoelectronic performances, such as photocurrent density and photoresponsivity, under ambient conditions severely hinder their practical application. To satisfy the demand of high-performance optoelectronic devices and topological insulators, bismuth telluride nanoplates (Bi2Te3 NPs) with different sizes, successfully synthesized by a solvothermal approach have been, for the first time, employed to fabricate a working electrode for photoelectrochemical (PEC)-type photodetection. It is demonstrated that the as-prepared Bi2Te3 NP-based photodetectors exhibit remarkably improved photocurrent density, enhanced photoresponsivity, and faster response time and recovery time in the UV-Vis region, compared to bismuthene and tellurene-based photodetectors. Additionally, the PEC stability measurements show that Bi2Te3 NPs have a comparable long-term stability for on/off switching behaviour for the bismuthene and tellurene-based photodetectors. Therefore, it is anticipated that the present work can provide fundamental acknowledgement of the optoelectronic performance of a PEC-type Bi2Te3 NP-based photodetector, shedding light on new designs of high-performance topological insulator-based optoelectronic devices.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Bingqing Wang,Tao Fu,Baohua An,Yong Liu
Sulfate radicals-based advanced oxidation process (SRAOP) has received increasing attention in the wastewater treatment area because sulfate radicals have high redox potential. The key for SRAOP is to develop high efficient catalysts that can effectively and stably activate persulfate (PS) to produce sulfate radicals. Cu 2 O is a good activator of PS and photo-catalyst. However, its catalytic activity is relatively low because of the poor stability and the recombination of electron and holes. In theory, Cu 0 can reduce Cu 2+ to form Cu + , which can decrease the recombination of electron and holes from the Cu 2 O by the formation of heterojunction. In this study, Cu 0 -Cu 2 O was synthesized by a simple ball-milling method. The as-prepared Cu 0 -Cu 2 O was characterized and used to activate PS for sulfamerazine (SMZ) degradation by means of UV illumination. In the Cu 0 -Cu 2 O/PS/UV system, the removals of 100% SMZ and 30% TOC within 30 min were achieved, respectively, and the removal efficiency of SMZ decreased by only 12.2% after 5 cycles. The high efficiency and good catalytic stability of Cu 0 -Cu 2 O for the activation of PS were due to that Cu 0 and photo-induced electron of Cu 2 O promoted the conversion of Cu 2+ to Cu + . Quenching experiments demonstrated that the hydroxyl radicals and sulfate radicals contributed to SMZ degradation. However, the concentrations and fractions of radicals was affected by the initial pH of solution. Nine intermediate products were identified, and the degradation pathways were proposed, including the fission of sulfur and nitrogen bond, the oxidation of methyl group and the hydroxylation of benzene ring. The effects of initial pH, PS concentration, Cu 0 -Cu 2 O dosage and SMZ initial concentration on the degradation of SMZ were investigated. This study provided an effective catalyst that could simultaneously activate PS and utilize UV to form photo-induced electron, which could enhance the degradation and mineralization of organic pollutants.
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CHEMOSPHERE
·
2020
·
IF 5.778
Ruihan Xiong,Zhuojun Lu,Qian Tang,Xueling Huang,Huazhen Ruan,Wei Jiang,Yiqun Chen,Zizheng Liu,Jianxiong Kang,Dongqi Liu
This study reports on the propranolol (PRO) degradation performance and product toxicity of an ultraviolet light-emitting diode (UV-LED)/chlorine process. The effects of experimental parameters including solution pH, chlorine dosage, and water matrix constituents on PRO removal were evaluated. Up to 94.5% of PRO could be eliminated within 15 min at a PRO-to-chlorine molar ratio of 1:4. The overall removal efficiency of PRO was non-pH dependent in the range of 5–9, while the initial rate was accelerated under alkaline conditions. The presence of Cl − /HCO 3 − had little influence on the PRO degradation, whereas either humic acid or NO 3 − had an obvious inhibitory effect. Radical scavenger experiments showed that both HO and Cl primarily contributed to the PRO degradation, and electron paramagnetic resonance data demonstrated the generation of 1 O 2 . The transformation of PRO during this process led to five detected products, which exhibited a higher acute toxicity than the parent compound according to the bright luminescent bacillus T3 method. It is worth mentioning that under the same ultraviolet illumination intensity, the degradation of PRO under UV-LED/chlorine gave a better performance than UV 254 /chlorine, but the EEO of the former is obviously higher than the latter. So further research is required on improving the electric current to photon conversion efficiency for UV-LED. Additionally, the UV-LED/chlorine system was effective in the degradation of other drugs including sulfamethoxazole, oxytetracycline hydrochloride, and gatifloxacin, suggesting the possible application of the UV-LED/chlorine process for the removal of pharmaceuticals during wastewater treatment .
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Qianfan Zhou,Kunpeng Qian,Jianhui Fang,Miao Miao,Shaomei Cao,Xin Feng
With the mushrooming of smart electronic devices, ultrathin Ti 3 C 2 T x MXene based EMI shielding materials with long term durability have aroused much interest. Herein, 2D Ti 3 C 2 T x /g-C 3 N 4 heterojunction films were firstly assembled using cellulose nanofibrils (CNF) as green binder via a solution-based pressured-filtration process. The heterojunction film with Ti 3 C 2 T x /g-C 3 N 4 mass ratio of 5:1 (28.20 µm in thick) exhibited distinguished performance with EMI shielding effectiveness of 42.99 dB in X-band and high tensile strength of 23.85 MPa. Specially, the generation of photo-electrons from g-C 3 N 4 nanosheets reduced TiO 2 into lower valence states under 365 nm UV light-irritation, resulting in lower loss on electrical conductivity as well as EMI shielding performance compared to their unilluminated counterparts. The reduction on TiO 2 offered by the g-C 3 N 4 enables the heterojunction film to be considered as a promising alternative EMI shielding material for future potential applications, because it can run long time just need UV light modulation.
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高影响因子
COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Hao Yuan,Ting Li,Yang Wang,Piming Ma,Mingliang Du,Tianxi Liu,Yangyang Yan,Huiyu Bai,Mingqing Chen,Weifu Dong
Polymeric optical composites have played an important role in selectively shielding solar light to satisfy the increasing requirements of photoprotection and environmental comfort as well as improving the energy saving efficiency of buildings and cars. In the present work, a smart polymer film with high near-infrared (NIR) and ultraviolet (UV) light shielding, acceptable visible light transmittance was developed on basis of CuS nanoplate. The influences of the CuS nanoplate size and the thickness of polymer composite films on the optical and shielding properties were studied. In particular, the composite film can shield 86.5% of the near-infrared light from 800 to 1800 nm and at the same time permitting acceptable visible light (63.4%) with the film thickness of 30 μm. In order to improved UV-shielding performance, CuS nanoplate coated by polydopamine (PDA) was used for preparation of polymer composite film. It was found that UV-shielding performance was further promoted in the entire UV region and exhibited a synergistic relationship between PDA and CuS, which certificating the outstanding contribution of PDA layer on the surface of CuS nanoplate. In a word, the comprehensive research on nanocomposite fabrication, surface modification, and integration techniques enable us to fabricate highly flexible, transparent and reliable composite films with outstanding UV and NIR shielding performance. This novel film is potential to be used as smart windows of buildings and cars for the application of cooling energy saving and UV protection.
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EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Shuaipeng Wang,Yonggang Wu,Jinyue Dai,Na Teng,Yunyan Peng,Lijun Cao,Xiaoqing Liu
Using renewable resource to synthesize UV-curable coatings with self-healing properties is of great significance to environmental protection and sustainable development. Herein, two bio-based UV-curable monomers itaconic acid-glycidyl methacrylate (IG) and 2-furoic acid-glycidyl methacrylate (FG) were synthesized from the renewable itaconic acid (IA) and 2-furoic acid (FA) under solvent-free condition. After their chemical structure was confirmed by Fourier Transform Infrared (FT-IR) and Nuclear Magnetic Resonance (NMR), FG was mixed with IG at different ratios to prepare the UV-curing coating films. Their thermal, mechanical and coating properties were investigated in detail. Results showed that the bio-based films with varied properties could be easily obtained by adjusting the weight ratio of IG and FG. Remarkably, they all demonstrated excellent self-healing, repairable and remodel abilities. For the first time, this work reported the bio-based UV-curable coatings with good repair-ability only with the assistance of heating, which should be a remarkable progress towards the sustainable development of organic coatings.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Lai Wei,Jing Li,Shuai Zhang,Bo Li,Yu Liu,Feng Wang,Shixiang Dong
In this study, polysiloxane resin was modified at the molecular scale to make it amenable to ultraviolet-curing and suitable for direct ink writing . The characterization results regarding the rheological properties and infrared spectra demonstrated that the conversion of C C is proportional to the viscosity and modulus of ink. As a result, three-dimensional cellular structures with a certain span and tailored porosity were obtained. The printed structures were then subjected to pyrolysis at temperatures higher than 1000°C to form uniform, crack-free, dense SiOC cellular ceramic structures, with ceramic yield of up to 70% and linear shrinkage as low as 25%. This technique enables the inexpensive and fast fabrication of SiOC ceramic products with relatively complex shapes.
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CHEMOSPHERE
·
2019
·
IF 5.108
Chao Song,Hua-Yu Liu,Shuang Guo,Shu-Guang Wang
As the most typical geological environment, limestone landforms are widespreading in the world and affect the waters that flow around them, which may also change the fate of organic contaminants in these waters. In this study, aquatic environment surrounding limestone was simulated with calcium carbonate , and the photolysis of tetracycline was evaluated under UV irradiation (30 μW/cm 2 ). More tetracycline (up to 98%) was removed in 4 h in the presence of calcium carbonate while only 50% of tetracycline was eliminated in control experiment. The removal of tetracycline was greatly enhanced due to the major roles of alkaline pH and minor roles of Ca 2+ and HCO 3 − /CO 3 2− . In alkaline pH, tetracycline existed as TCs − with higher electronic density in the ring structures, which was more easily attacked by OH. Besides, it could also change the bond orbital energy to facilitate tetracycline absorbing more photon. Moreover, alkaline pH was beneficial to generate more OH and thus promote the indirect photolysis. In addition, alkaline pH also changed the degradation path of tetracycline and rapidly convert tetracycline to the byproducts with m/z 457 via hydroxylation and hydrogen abstraction. This work provides not only better understanding about the fate of tetracycline in aquatic environments but also new insights into the treatment of antibiotic-contaminated water.
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Biomimetics
·
2022
·Vol. 7
·期 4
·217
·
IF 3.743
Jie Li,Yushan Li,Yiyi Lu,Wentian Shi,Huafeng Tian
With industry development, the separation of oily wastewater is becoming more critical. Inspired by organisms such as lotus leaves, biomimetic superhydrophobic surfaces with micro-nano structures have shown great potential in this regard. In this work, PDMS/PVDF oil–water separation membranes with designed microstructures were prepared by electrospinning technology. The membrane-forming effect of electrospinning with different ratios of PDMS and PVDF was studied. The study found that membranes with high PDMS content were more likely to form microspheres, and PDMS tended to concentrate on the microspheres. The results also showed that the microspheres would bring better hydrophobicity to the membrane. When the ratio of PDMS to PVDF is 1:2, the membrane has a water contact angle of up to 150° and an oil contact angle of 0°. At this ratio, the separation efficiency of the membrane for the water-in-oil emulsion is 98.7%, and it can still maintain more than 98% after ten separation cycles, which is a good candidate for oil–water separation. Furthermore, microspheres enable the membrane to achieve macroscopic uniformity and microscopic phase separation so that the membranes have both good elongation and fracture strength. In addition, the PDMS/PVDF membranes also exhibit excellent UV resistance, and their UV protection factor is greater than 185, making them a potential UV protective material.Keywords:electrospinning;polydimethylsiloxane;polyvinylidene difluoride;oil–water separation;UV protection
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 41
·期 3
·365-372
·
IF 3.815
Hu Jia-Qi,Huang Wei-Pin,Wang Jing,Ren Ke-Feng,Ji Jian
Porous coatings with the features of muti-interfaces and high specific surface area have emerged as an excellent material platform for the manipulation of porous structures. Layer-by-layer (LbL) assembly technique has been widely used in preparing porous polyelectrolyte coatings. However, the efficient construction of stable film from the LbL technique is still a question. Herein, we reported a new solution to construct a stabilized polyelectrolyte coating with porous structures. Inspired by the mechanical reinforcement of double-network hydrogel, we constructed the poly(ethylenimine) (PEI)/poly(acrylic acid) (PAA) coating by in situ photopolymerization of acrylic acid in the PEI network instead of assembling PEI and PAA. Compared with the LbL films, the in situ polymerized coating kept higher stability after 30 iterations of friction. Porous structures could also be constructed after acid treatment, which was utilized to load lubricant to enhance the lubricating property of the coating. This work provides a new method for the construction of dynamic and stable polyelectrolyte coatings, expediting more development of practical applications.
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