CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Jing Xu,Xiangyi Shen,Duanli Wang,Chuxuan Zhao,Zizheng Liu,Ivan P. Pozdnyakov,Feng Wu,Jun Xia
The usage of p -arsanilic acid (ASA) in livestock and poultry farms leads to its release into the environment. The phototransformation of ASA generates toxic inorganic arsenic species and organic by-products, which affects the water security of the peripheral river basin. In this work, we have investigated the pH-dependent kinetics and mechanisms of ASA photolysis under Ultraviolet-C (UV-C) light (254 nm) irradiation in the pH range 1–11 in the absence of oxygen. The degradation rate of ASA, the ratio of the generated inorganic arsenic species, and the amount of primary organic by-products were determined under the aforesaid conditions. Our results clearly showed the pH-dependent photochemistry of ASA. The photolysis rate was low under acidic conditions, and As(III) and p -aminophenol were the main products. With increasing pH, the photolysis rate increased significantly, and As(V) and aniline became the main products. A pH-based kinetic model has been established that allows prediction of the generation rates of As(III), As(V), p -aminophenol, and aniline according to the photolysis rate of ASA.
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COMPOSITES PART B-ENGINEERING
·
2017
·
IF 4.727
Tong Zhang,Bo Jiang,Yudong Huang
A novel polymerizable benzophenone photoinitiator containing acryloxy (BPA) was synthesized. The photopolymerization of photosensitive methacrylic-silicone resins (MASR) initiated by BPA was studied. Results show that BPA is an efficient photoinitiator, which could generate radicals from the photolysis reaction and be consumed via copolymerizing with MASR. The designed UV-curing silicone resins system initiated by BPA showed a high carbon-carbon double bonds conversion above 80% after 20 s UV radiation. In addition, reduced graphene oxide (rGO)-TiO 2 composites were elaborated by hydrothermal reaction . The synergistic effects from graphene and TiO 2 further enhanced the carbon-carbon double bonds conversion of MASR to 86% with 15 s UV irradiation, demonstrating that the incorporated rGO-TiO 2 significantly improve the formulation UV-curing reactivity. Additionally, UV-cured MASR with rGO-TiO 2 showed an excellent thermal stability. This work proposes an efficient strategy to improve the polymerization degree of UV-curable photosensitive silicone resins.
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POLYMER
·
2024
·
IF 4.1
Lingmei Jiang,Haoran Liu,Kuanyu Yuan,Guangsheng Zhang,Changhong Xiao,Chenghao Wang,Lishuai Zong,Jinyan Wang,Xigao Jian
The incorporation of hyperbranched structure into the polyaryletherketone (PAEK) is a crucial method for achieving a low dielectric constant ( D k ), and the inclusion of crosslinked structure effectively reduces the dielectric loss ( D f ). This approach is of great significance in the development of high-quality communication at high frequencies. However, it is still a significant challenge for maintaining its mechanical properties and reducing D k and D f due to the poor film-forming properties and low ductility of hyperbranched polymers . In this study, we synthesized a novel acrylate-based fluorinated hyperbranched photosensitive polyaryletherketone ( hb -P6FAEK-Ace) as a prepolymer with various bifunctional aliphatic active and 4-acryloyl morpholine as the reactive solvent. Upon UV irradiation, cured films were obtained. This method significantly improved the mechanical properties of the hyperbranched UV-cured resin, with the tensile strength of CF-DCDDA of 83.2 MPa and the elongation at break of 7.61%. Additionally, the five prepared photosensitive resins exhibited excellent rheological properties (from 71.6 mPa s to 134.7 mPa s at 100 °C), rapid curing rates (within tens of seconds), and minimal volume shrinkage (<7%). Meanwhile, the D k of CF-DCDDA was measured to be 2.87, with a D f of 0.0126 at the frequency of 20 GHz. This low dielectric expression for the crosslinked cured films could be ascribed to the confinement of electronic polarization caused by the crosslinked and hyperbranched structures. This work provides a simple, green, and promising strategy for enhancing the dielectric and mechanical properties of hb -PAEK.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Daokun Wen,Peize Yang,Yunxiang Ma,Mengyao Wu,Xiaoshuang Li,Minghui Zhu,Bing Geng,Guanghui Cui,Hui Li
With the popularization of the concept of sustainable development, biobased precursors are attracting increasing attention in the production of UV-curable adhesives. In this study, a straightforward solvent-free approach to prepare biobased adhesives was employed to synthesize methacrylic acid-modified epoxy soybean oil (AESO), which was subsequently blended with flexible hyperbranched siloxane (HPSI-HS) and hydrophobic 2,2,2-trifluoroethyl methacrylate (TFEMA) monomers. The resultant adhesive can be effectively adhered to the substrates through in situ UV curing with the help of initiators. The introduction of HPSI-HS and TFEMA not only reduced the viscosity of the adhesive, achieving a solvent-free adhesion process, but also improved the adhesion strength, flexibility, and thermal stability of the adhesives. The adhesive exhibits exceptional bonding strength to a variety of substrates, including glass, PVDF, copper, and aluminum. The adhesive is insoluble in water and can be bonded in various liquid environments including dimethyl silicone oil, artificial sweat (pH 4.7), seawater, deionized water, hydrochloric acid aqueous solution, and sodium chloride aqueous solutions. The adhesive is prone to degradation in a concentrated alkaline solution. Both the adhesion strength and degradation performance can be effectively modulated by adjusting the formulation meticulously. The multifunctional, degradable, and biobased fluorosilicone adhesive that is suitable for diverse application scenarios presents a practical approach to the advancement of green adhesives.
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WATER RESEARCH
·
2024
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IF 11.4
Yang Deng,Shansheng Mo,Gregory V. Korshin,Mingquan Yan
Differential absorption spectroscopy (DAS) quantifies changes in the UV–Visible absorbance of dissolved organic matter (DOM) caused by reactions of its chromophores. As a result of its precision and sensitvity, DAS serves as a powerful tool for characterizing the formation of disinfection by-products (DBPs) in generated in DOM chlorination reactions. However, the nonlinear relationship between the intensity of DAS and DBP concentrations as well as the need to develop site-specific fitting parameters limit its practical applications. This study investigated the physico-chemical nature of DAS of chlorinated DOM through experimental measurements and theoretical calculations. Results of this study provide molecular-level evidence that electrophilic substitution reactions involving DOM reactive sites result in the emergence of DAS feaures ascribed to the "fast" chromophores. The ring opening in the cyclic enones-like structures which can be present either in the original DOM or are generated as intermediates in its chlorination, leads to the emergence of DAS features associated with the "slow" chromophores and high yields of DBPs. The kinetic study of chlorination of real waters reveals a strong linear relationship (R 2 > 0.91) between ln([DBP]) and the long-wavelength (λ > 325 nm) parameter of the DAS, notably (ln(-DA 350 )). This relationship varies among different water sources due to the differences in the heterogeneity of Band A 3 whose maximum is near 350 nm. Band A 3 is one of the Gaussian bands that comprise the overall UV–Visible spectrum of DOM. A new function ( f ( − D A 350 ) ) is proposed in this study to quantify DBP formation. This function, which is determined by the Band A 3 's area, allows establishing a universal linear relationship between f ( − D A 350 ) and ln([THMs]), as well as f ( − D A 350 ) and ln([HAAs]), across various water sources. The findings of this study will stimulate further development of spectroscopy-based DBP monitoring technology for monitoring and optimization of water disinfection processes.
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ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2024
·Vol. 46
·期 2
·1-13
·
IF 3.2
Wang Tao,Deng Lin,Dai Wenjuan,Tan Chaoqun,Hu Jun,Singh Rajendra Prasad
Brominated halonitromethanes (Br-HNMs) are generated in water disinfection processes and present high toxicity to human health. This work used aspartic acid (ASP) as the precursor to reveal that bromide (Br − ) induced the production of Br-HNMs in the UV/chlorine disinfection process. Consequently, six Br-HNMs were identified, and their yields presented an increasing and then declining evolution over the reaction time from 0 to 15 min. Also, the total Br-HNMs yield reached the maximum of 251.1 μg L −1 at 5 min and then declined to 107.1 μg L −1 . The total Br-HNMs yield increased from 2.40 to 251.14 μg L −1 with the increase of Cl 2 :Br − ratios from 0.25 to 3.0 by increasing free chlorine dosage with a fixed Br − concentration, and it increased from 207.59 to 251.14 μg L −1 and then decreased to 93.44 μg L −1 with the increase of Cl 2 :Br − ratio from 1.0 to 3.6 by increasing Br − concentration with a fixed free chlorine dosage. Besides, the total Br-HNMs yield reached the highest value (251.14 μg L −1 ) at pH 7.0 and the lowest value (74.20 μg L −1 ) at pH 8.0. Subsequently, the possible reaction mechanism of Br-HNMs generated from ASP was deduced, and the changes in toxicity of Br-HNMs also followed an increasing and then declining trend, closely relating to Br-HNMs yields and Br − utilization. This work explored and illustrated the yields, influence factors, reaction mechanisms, and toxicity of Br-HNMs formed from Br − containing ASP water during UV/chlorine disinfection, which might help to control Br-HNMs formation.
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Polymers
·
2024
·Vol. 16
·期 21
·2972
·
IF 4.7
Qiankun Hun,Lingxiao Lan,Xuanan Lu,Qicheng Hu,Xinghua Liang,Yifeng Guo,Yujiang Wang
Solid-state electrolytes are widely anticipated to revitalize high-energy-density and high-safety lithium-ion batteries. However, low ionic conductivity and high interfacial resistance at room temperature pose challenges for their practical application. In this work, the dual-matrix concept is applied to the design of a bilayer heterogeneous structure. The electrolyte in contact with the cathode blends PVDF-HFP and oxidation-resistant PAN. In contrast, the electrolyte in contact with the anode blends PVDF-HFP and reduction-resistant PEO. A UV-curing process was used to fabricate the bilayer heterostructure electrolyte. The heterostructure electrolyte exhibits an ionic conductivity of 4.27 × 10−4S/cm and a Li+transference number of 0.68 at room temperature. Additionally, when assembled into LiFePO4/CPEs/Li batteries, it shows a high initial discharge capacity at room temperature (168 mAh g−1at 0.1 C and 60 mAh g−1at 2 C), with a capacity retention of 93.3% after 100 cycles at a current density of 0.2 C. Notably, at 60 °C, the battery maintains a discharge capacity of 90 mAh g−1at 2 C, with a capacity retention of 97.4% after 100 cycles at 0.2 C. Therefore, solid-state batteries using this bilayer heterogeneous structure electrolyte demonstrate promising performance, including effective capacity output and cycling stability.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Bokun Chang,Zixuan Huang,Xiaodong Yang,Tianhuan Yang,Xianhui Fang,Xianbao Zhong,Wei Ding,Gang Cao,Yajun Yang,Feinan Hu,Chenyang Xu,Ling Qiu,Jialong Lv,Wei Du
To investigate the adsorption effects of aged microplastics (MPs) on Pb(II) and their co-transport properties in homogeneous (quartz sand) and heterogeneous (quartz sand with apple branches biochar) porous media, we explored the co-transport of UV-irradiated aged MPs and coexisting Pb(II) along with their interaction mechanisms. The UV aging process increased the binding sites and electronegativity of the aged MPs' surface, enhancing its adsorption capacity for Pb(II). Aged MPs significantly improved Pb(II) transport through homogeneous media , while Pb(II) hindered the transport of aged MPs by reducing electrostatic repulsion between these particles and the quartz sand. When biochar, with its loose and porous structure, was used as a porous medium, it effectively inhibited the transport capacity of both contaminants. In addition, since the aged MPs cannot penetrate the column, a portion of Pb(II) adsorbed by the aged MPs will be co-deposited with the aged MPs, hindering Pb(II) transport to a greater extent. The transport experiments were simulated and interpreted using two-point kinetic modeling and the DLVO theory. The study results elucidate disparities in the capacity of MPs and aged MPs to transport Pb(II), underscoring the potential of biochar application as an effective strategy to impede the dispersion of composite environmental pollutants.
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EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Xiangzhao Wang,Xiaobin Huang,Zemin Ji,Haoqiang Sheng
Outdoor icephobic coatings are prone to damage, particularly in extreme weather conditions like freezing temperatures and acid rain. Damage to the coating will result in a loss of icephobic function and may lead to increased icing. Furthermore, it is imperative to incorporate sustainability into icephobic coatings as environmental consciousness grows. Herein, a vanillin-based icephobic coating with anti-extreme-environment self-healing was prepared by incorporating vanillin-based polyols into prepolymers terminated with isocyanates that include silicone oil. The coating exhibited low ice adhesion with a measurement of 8.8 kPa, which was mainly attributed to the hydrophobicity of PDMS and the hydrophobic and lubricating characteristics of silicone oil. Moreover, the coating's remarkable chemical stability and ability to resist fouling were due to its lubricating and hydrophobic properties. More importantly, the coating retains impressive self-healing abilities in extreme conditions (−20 °C, pH = 1, pH = 14) due to the multiple dynamic bonds within the coating and the water-repelling and plasticizing effects of silicone oil. The coating maintained its original hydrophobic characteristics and low ice adhesion strength even after several recycling and self-healing cycles, demonstrating remarkable lifespan and sustainability. This work facilitates meeting the need for anti-icing in outdoor areas, particularly in extremely cold, acidic, and alkaline conditions.
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LANGMUIR
·
2024
·
IF 3.7
Chun Hu,Yaodong Xiao,Qingrong Jiang,Mengyao Wang,Tingdan Xue,Ruidong Tao,Yunjun Mei
Microplastics (MPs) are novel pollutants that can adsorb heavy metals in water environments and migrate together as carriers and are prone to aging due to the light in water. However, few reports have been published on the synergistic behavior and effects of these different types of aged MPs on the adsorption and desorption of Cr(VI). Here, two MP types─polyamide (PA) and polylactic acid (PLA)─were aged by UV irradiation, and the adsorption and desorption behaviors of MPs on Cr(VI) were studied. The results indicated that UV light can rapidly age MPs. After the MPs were exposed to UV light, their specific surface area, negative charge, and oxygenic groups increased, resulting in enhanced hydrophilicity. The aged MPs depicted a markedly enhanced adsorption capacity for Cr(VI) compared with the results of aged-PA > pristine-PA > aged-PLA > pristine-PLA. The process followed the Langmuir and pseudo-second-order models, confirming that chemical and monolayer adsorption are the primary processes involved in the adsorption of Cr(VI) by aged MPs. Cr(VI) was more easily desorbed in the simulated gastric fluid environment. The desorption rate of aged MPs was lower than that of pristine MPs because of their stronger binding forces to Cr(VI). The binding of Cr(VI) to MPs mainly depends on synergistic mechanisms such as electrostatic attraction, reduction reactions, and chelation of oxygenic groups. This study clarifies the reciprocity mechanism between aging MPs and Cr(VI) and provides further insights and guidance for controlling the joint pollution between MPs and heavy metal pollutants in the future.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Hua-Xin Huang,Xin-Yi Ouyang,Jia-Le Zhang,Chen-Chen Lu,Peng Li,Wei Wu,Robert K Y Li,Xiao-Ming Ren,Hui Zhao
Ultraviolet (UV) shielding materials have garnered widespread applications in biological protection, aerospace, intelligent coating, and other fields. However, they are vulnerable to external friction scratches due to prolonged exposure, which leads to a decline in their UV shielding ability, further limiting their long-term applications. In this work, a series of waterborne polyurethane–polydopamine nanocomposites with excellent self-healing and UV shielding properties were prepared, among which using waterborne polyurethane with Diels–Alder thermally reversible cross-linked networks as the substrate and polydopamine (PDA) nanoparticles as the UV shielding agent. The developed nanocomposites can achieve a good self-healing effect at 120 °C in 30 min, and the self-healing efficiency can reach more than 68%. Adding PDA nanoparticles can enhance the mechanical and UV shielding properties of the nanocomposite. The nanocomposite with 0.5 wt % PDA contents has both the highest tensile strength and elongation at break, with values of 9.9 MPa and 667.27%, respectively. UV–vis tests exhibit that the residual amount of methylene blue solution under the protection of the nanocomposite film containing 2 wt % PDA content could reach 63.81%, concluding that the as-prepared nanomaterials have excellent UV shielding properties. This study offers an idea for the production of excellent and durable UV shielding materials with self-healing properties.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Hong Duan,Ning Zhang,Lingyan Zheng,Baoguo Sun,Gang Chen
s Food is prone to spoilage due to light and microbial exposure. To address this issue, Polystyrene microspheres @ Polydopamine / Diethyl ferulate / AgNPs (PS@PDA/DEF/Ag) was synthesized via copper-catalyzed azide/alkynyl cycloaddition reaction (CuAAC) and in-situ reduction. Subsequently, it was incorporated into a polyvinyl alcohol (PVA) matrix to fabricate PS@PDA/DEF/Ag/PVA multifunctional films. Derivative thermogravimetric (DTGA) analysis showed the exothermic peak of PS@PDA/DEF/Ag/PVA-4 wt% increased from 265.3 °C to 334.5 °C compared with PVA film. At concentrations exceeding 0.5 wt%, the UV shielding rate of the composite films reached at least 94.0%. The antibacterial experiments revealed that PS@PDA/DEF/Ag/PVA-4 wt% exhibited inhibition zone diameters of 3.8 ± 0.3 mm and 3.2 ± 0.3 mm against E. coli O157:H7 and S. aureus . Furthermore, the multifunctional films significantly prevented milk photooxidation for 3 days, jujubes brownish and strawberries decay for 7 days, demonstrating their effectiveness in antibacterial and UV-blocking food packaging.
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