Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 5
·1569-1578
·
IF 2.3
Ding Zhu,Chen Jiahui,He Zonglin,Wang Chaozhi,Li Hualin,Huang Zhenhong,Liu Baohua,Song Lina
A series of two-component UV-curable waterborne CO 2 -based polyurethane dispersions (UV-PUDs) with excellent flexibility and mechanical strength were synthesized from poly(propylene carbonate) diol (PPCD), isophorone diisocyanate (IPDI), 2,2-bis(hydroxymethyl) propionic acid (DMPA), 2-hydroxyethyl acrylate (HEA), pentaerythritol triacrylate (PETA) and 1,4-butanediol (BDO). One component was UV-curable waterborne polyurethane terminated by HEA and PETA (molar ratio 1:1), and the other component was linear waterborne polyurethane. The content of the UV-curable component in UV-PUD was 15%, 30%, 45%, 60%, and 100% (weight content). The obtained cured films exhibited superior flexibility without loss of tensile strength, accompanied by excellent acid and alkali resistance. In particular, the dried UV-PUD films without curing showed good mechanical properties.
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CHEMOSPHERE
·
2023
·
IF 8.8
Yuliya E. Tyutereva,Olga A. Snytnikova,Roman G. Fedunov,Vadim V. Yanshole,Victor F. Plyusnin,Jing Xu,Ivan P. Pozdnyakov
Mechanism of direct UV photolysis of nalidixic acid (NA), a model quinolone antibiotic, was revealed using a combination of steady-state photolysis coupled with high resolution LC-MS and DFT quantum-chemical calculations. Both quantum yields of photodegradation and detailed identification of final products were performed for the first time for two main forms of NA: neutral and anionic. The quantum yield of NA photodegradation is 0.024 and 0.0032 for the neutral and anionic forms in the presence of dissolved oxygen and 0.016/0.0032 in deoxygenated solutions, respectively. The main process is photoionization with the formation of a cation radical, which undergoes transformation into three different neutral radicals and further into final photoproducts. It is shown that the triplet state does not play a role in the photolysis of this compound. The main products of photolysis are the products of the loss of carboxyl, methyl and ethyl groups in the NA molecule, as well as the dehydrogenation of the ethyl group. The results obtained may be important for understanding the fate of pyridine herbicides in the processes of disinfection by UV and in natural waters under the action of sunlight.
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ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Na Sun,Xianglian Wang,Zhanmeng Liu
In this study, electrochemically generated free chlorine (EC/Cl2) was activated by UV irradiation with a light emitting diode (LED) lamp at 275 nm to degrade acetaminophen (AAP, 2 μM) in aqueous solution. The potential at a RuO2-IrO2/Ti plate anode was set at 1.5 V vs. the Ag/AgCl electrode. Chlorine was in situ generated in the presence of Cl杴 at the anode and then it was transformed into various active species such as 晑OH and reactive chlorine species (RCS) under UV-LED irradiation. The degradation of AAP was investigated using batch tests, evaluating the influence of different experimental conditions such as NaCl concentration, phosphate buffer saline concentration, irradiation time and solution pH, keeping constant the UV-LED power and temperature. Results show that AAP could be completely degraded by the hybrid process with a high mineralization ratio (73%), and the degradation process followed a pseudo-first-order kinetics. The value of the Electric Energy per Order (EEO) = 1.272 kWh m杴3 order?, which is lower than the energy consumption of some other UV-based processes for AAP degradation. Adding 1 mM HCO3杴 ions slightly decreased the rate of AAP degradation. Luminescent bacteria experiment revealed that the acute toxicity of the reacted solution could be greatly reduced and the ecological risk was effectively abated. The scavenging assay shows that RCS plays a key role in the AAP degradation. The intermediate products were identified, and possible degradation routes were proposed. The system can advantageously replace conventional UV mercury lamp based ones in the degradation of microorganic pollutants.
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CHEMOSPHERE
·
2018
·
IF 4.427
Yuliya E. Tyutereva,Petr S. Sherin,Marina V. Parkhats,Zizheng Liu,Jing Xu,Feng Wu,Victor F. Plyusnin,Ivan P. Pozdnyakov
The mechanism of direct UV photolysis of p-arsanilic acid (p-ASA), a widely used veterinary drug, was revised by means of laser flash photolysis coupled with high resolution liquid chromatography – mass spectrometry (LC-MS). None of p-ASA triplet state or singlet oxygen was found to directly participate in the photodegradation of p-ASA as it was assumed in previous works. Here we demonstrate that the main primary photoprocess is a monophotonic ionization (ϕ ion 266nm = 0.032) leading to the formation of hydrated electron and corresponding anilinyl cation radical. These primary species react with dissolved oxygen yielding secondary reactive oxygen species . The final organic photoproducts, such as aminophenol and different dimeric products, originate from various reactions between these secondary species. The generation of inorganic arsenic, both As(V) and As(III), was also observed in agreement with previous works. For the first time we report the quantum yield of p-ASA photodegradation, which decreases from 0.058 to 0.035 with the excitation wavelength from 222 to 308 nm.
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CHEMOSPHERE
·
2019
·
IF 5.108
Yiqun Chen,Chuanjing Lin,Yiyi Zhou,Li Long,Lili Li,Min Tang,Zizheng Liu,Ivan P. Pozdnyakov,Li-Zhi Huang
The transformation of roxarsone (ROX) during UV disinfection with Fe(III) has been investigated. Fe(OH) 2+ , as the main Fe(III) species at pH = 3, produces HO under UV irradiation leading to the oxidation of ROX. Dissolved oxygen plays a very important role in the continuous conversion of generated Fe 2+ to Fe 3+ , which ensures a Fe(III)-Fe(II) cycle in the system. The presence of Cl − /HCO 3 − /NO 3 − has little influence on the ROX transformation, whereas PO 4 3− achieves an obvious inhibitory effect. The transformation of ROX leads to the formation of inorganic arsenic consisting of a much higher amount of As(V) than As(III). LC-MS analysis shows that phenol, o -nitrophenol and arsenic acid were the main transformation products . Both the radical scavenger experiment and electron spin resonance data confirm that the HO is responsible for ROX transformation. The toxic transformation products are found to have potential environmental risks for the natural environment, organisms and human beings.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xu Ni,Jing Luo,Ren Liu,Xiaoya Liu
A new flexible resistor-type humidity sensor was developed based on UV-cured carbon nanotube composite film as humidity-sensing material. Carbon nanotubes (CNTs) were firstly mixed with UV-curable resin via ball-milling. Simply by spin-coating of this mixture on flexible interdigitated electrode and subsequent UV-curing, a flexible humidity sensor based on UV-cured CNTs composite film was thus fabricated. With the utilization of UV-curing technology, this fabricating strategy is rather simple, highly efficient (accomplished in several minutes), cost-effective, and environmental-friendly (no organic solvent). The effect of the CNTs content, the nature of the UV-curable resin as well as their ratios on the humidity-sensing performance was systematically investigated. Under optimized conditions, the UV-cured CNTs composite film showed remarkable sensing performance over a wide humidity span from 6% to 84%. In addition, the as-prepared CNTs composite film exhibited small hysteresis and fast response. Moreover, good repeatability and long-term stability was demonstrated. This work offers a novel, economical and promising way to fabricate humidity sensors considering the facile, efficient and green preparation strategy and outstanding sensing properties.
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Environmental Chemistry Letters
·
2019
·Vol. 17
·期 3
·1435-1439
·
IF 4.617
Chen Yiqun,Tong Yang,Liu Zizheng,Huang Li-Zhi,Yuan Jianping,Xue Yingwen,Fang Zheng
UV-activated persulfate (PS) systems have been widely employed to remove organic contaminants. However, the heavy use of persulfate may lead to secondary pollution. Here we proposed a novel UV/PS/sulfite oxidation process, in which sulfite would not only promote but also partially replace persulfate to produce sulfate radicals. We tested this system using Orange II as a model compound. Results show that the use of sulfite improves the degradation of Orange II. For instance, increasing the molar ratio of sulfite to persulfate in the range of 0.05–0.5 enhanced the removal efficiency by 21.7%. Compared to the UV/PS system, the presence of sulfite can achieve a 33.4% higher performance. We also found that the absence of dissolved oxygen remarkably inhibited the oxidation of Orange II. SO
·− 4
, SO
·− 5
and HO · were identified in the UV/PS/sulfite system, and SO
·− 4
and HO · should be primarily responsible for Orange II removal.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 11
·10808-10819
·
IF 2.8
Peng Zhongya,Zhao Hang,Lyu Honghong,Wang Lan,Huang Hua,Nan Qiong,Tang Jingchun
This study was conducted to understand the effects of ultraviolet (UV) irradiation on the physicochemical properties and the hexavalent chromium (Cr(VI)) removal ability of biochar. Structural and morphological analysis showed that UV irradiation increased the specific surface area of biochar and added a large amount of oxygen-containing functional groups (e.g., carboxyl, lactonic, and hydroxyl) to biochar’s surface. Batch sorption experimental results showed that UV-modified biochar (UVBC) produced at the pyrolysis temperature of 300 °C, the irradiated time of 24 h, and the irradiation distance of 40 mm exhibited excellent Cr(VI) removal ability (from 1.11 mg/g for BC to 20.04 mg/g for UVBC, a 18.1-fold increase). The adsorption kinetics and adsorption isotherm data agreed well with the pseudo-second-order model and Freundlich model, respectively. Experimental and modeling results suggest that the oxygen-containing functional groups and specific surface areas of biochars were notably increased by UV irradiation, which enhanced Cr(VI) adsorption by surface complexation. X-ray photoelectron spectroscopy (XPS) analysis of UVBC before and after reaction with Cr(VI) showed that reduction occurred during Cr(VI) adsorption. The energy consumption of UV modification is 2.7 MJ per gram of UVBC produced, which is comparable to that in activated carbon. The results showed that the method of UV modification of biochar is a very novel and effective method for the adsorption of Cr(VI) in solution.
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Applied Sciences-Basel
·
2018
·Vol. 8
·期 4
·615
·
IF 1.689
Xiangyi Shen,Jing Xu,Ivan P. Pozdnyakov,Zizheng Liu
Used as a kind of feed additive,p-arsanilic acid can pose a potential risk to organisms when abandoned in the environment. The photodegradation ofp-ASA was investigated under UV-C irradiation in the presence of persulfate (PS) in this work. The addition of PS facilitated the decomposition ofp-ASA and notably, the presence of 50 mmol PS brought about a nearly complete mineralization after 3 h, while an insignificant total organic carbon (TOC) removal was observed under UV irradiation (λ = 254 nm) only. Experimental results proved that sulfate radical (SO4•−) was responsible for the promotion effect. The cleavage of As-C bond released inorganic arsenic and caused the occurrence of various organic products, for example, hydroxybenzaldehyde, nitrobenzene, benzenediol sulfate, and biphenylarsinic acid. The application of PS with UV-C light may throw a light on thorough treatment forp-ASA containing wastewater.Keywords:p-arsanilic acid;photodegradation;UV/persulfate system;sulfate radical
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2018
·Vol. 303
·期 6
·1800020
·
IF 2.69
Qingqing Zhu,Liyan Liang,Xiangxiang Du,Fei Xiao,Yuyue Guo,Jun Shi,Kun Wu,Mangeng Lu
A series of cycloaliphatic epoxy acrylate prepolymer poly (METHB- co -MMA- co -BA) (MMB) and an epoxycyclohexyl-modified polydimethylsiloxane (PDMS-VCH) are prepared to fabricate hybrid coatings. The curing process, surface performance, mechanical properties, and thermal behavior are investigated by real-time Fourier transform infrared (FT-IR), contact angle measurements, tensile test, thermogravimetric analyzer (TGA), and differential scanning calorimeter (DSC). For the same photoinitiator (PI) concentration, both the epoxy value and the amount of PDMS-VCH negatively affect the UV-curing process. The contact angle of hybrid coatings increases by almost 12° with 4 wt% PDMS-VCH's addition. The increasing ratio of soft acrylate segment can strengthen the toughness of materials markedly. Besides, thermal stability is enhanced with the increasing of epoxy value, while slight changes are found with the addition of PDMS-VCH. Based on these properties, the hybrid coatings can be applied in various fields, including protection, decoration, and other displayed fields.
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RSC Advances
·
2019
·Vol. 9
·期 20
·11013-11025
·
IF 3.049
Junhua Chen,Kaimei Peng,Weiping Tu
Two modified types of hyperbranched polymer were successfully prepared using hyperbranched polyether (HBPE) as a matrix, cis-5-norbornene-endo-2,3-dicarboxylic anhydride (CDA) or o-phthalic anhydride (PA) as a modifier and by grafting an NCO-terminated compound (IPDI-HEA). The modified hyperbranched polymers were incorporated into a typical water-soluble polyacrylate (WPA) as crosslinkers to develop high-performance waterborne UV-curable coatings via electrophoretic deposition (EPD). Although the particle size of the electrophoretic dispersion increased from 43.8 nm to 164 nm, no microphase separation occurred, and the smooth SEM images of the coatings confirmed their uniformity. The rate of photopolymerization (Rp) and percentage conversion of the double bonds increased with increasing active unsaturated double bond content, and were partially affected by steric effects. Thermal gravity analysis and tensile tests indicated that the UV-curable EPD coating films exhibited better thermal stability due to their hyperbranched structure, soft and hard segment content and crosslinking density. The coated tin plate could resist chemical corrosion after immersion in NaCl solution. The coatings demonstrated strong adhesion to extremely bent tin plates and outstanding tolerance to knife-scratches and impact. This is a promising method for the design of desirable coatings in the EPD industry.
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Nano Energy
·
2017
·
IF 12.343
Nan Ma,Ya Yang
ABSTRCT Ferroelectric material BaTiO 3 (BTO) with intrinsic spontaneous polarization demonstrates excellent pyroelectric effect that output current/voltage signals can be observed even by slight temperature fluctuation. Here, we report a self-powered 365 nm UV light photodetector by using the light-induced pyroelectric effect in Ag/BTO/Ag device with the response time of about 0.5 s at the rising edge. Moreover, the heating-induced pyroelectric effect has been utilized to enhance the 365 nm light response, where both the corresponding photoconductive gain and responsivity can be dramatically enhanced by larger than 1200% under a temperature variation rate of 2.1 K/s as compared with that of UV light illumination. Our study proposes a feasible method to enhance the 365 nm light response by coupling light and heating-induced pyroelectric effect in BTO, which has potential applications in thermal energy scavenging and self-powered sensor systems .
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