CHEMICAL PAPERS
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2025
·
IF 2.5
Dai Mengxia,Wang Chaoyang,Wang Yashan,Zhang Ran,Chen Feifei
Due to the increasing deterioration of the aqueous environment caused by various organic dyes, the development of highly efficient novel photocatalysts has become urgent. This study designed a novel UV/layered double oxides (LDO)/thiourea dioxide (TD) system based on UV-assisted advanced reduction processes to achieve efficient and cost-effective degradation of methyl orange (MO). The experimental results exhibited that 99.7% of 50 mg/L MO was completely degraded in UV/LDO/TD within 20 min at 25 °C and pH 10. During the decomposition of TD, highly reductive e aq − , SO 2 2− and H· were generated, and in the presence of dissolved oxygen simultaneously produced oxidizing species such as O 2 ·− , OH·, and 1 O 2 . Oxygen vacancies of LDO not only activated TD but also acted as an electron shuttle to transfer electrons from TD to MO. Non-radical degradation pathways, including 1 O 2 and electron transfer process, dominated the degradation of MO. The degradation efficiency of MO remained at 93.2% after 5 cycles, demonstrating the excellent reusability of LDO in the UV/LDO/TD system. This study provided new insights into LDO-activated TD under UV irradiation for environmental remediation. It highlighted the commercial potential of the UV/LDO/TD system for sustainable, scalable removal of organic dyes from industrial wastewater.
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产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 17
·3794
·
IF 3.267
Yu-Wei Fu,Yong-Qi Zhang,Wei-Feng Sun,Xuan Wang
In order to inhibit the outward-migrations of photo-initiator molecules in the ultraviolet-initiated crosslinking process and simultaneously improve the crosslinking degree and dielectric properties of crosslinked polyethylene (XLPE) materials, we have specifically developed surface-modified-SiO2/XLPE nanocomposites with the silica nanofillers that have been functionalized through chemical surface modifications. With the sulfur-containing silanes and 3-mercaptopropyl trimethoxy silane (MPTMS), the functional monomers of auxiliary crosslinker triallyl isocyanurate (TAIC) have been successfully grafted on the silica surface through thiol–ene click chemistry reactions. The grafted functional groups are verified by molecular characterizations of Fourier transform infrared spectra and nuclear magnetic resonance hydrogen spectra. Scanning electronic microscopy (SEM) indicates that the functionalized silica nanoparticles have been filled into polyethylene matrix with remarkably increased dispersivity compared with the neat silica nanoparticles. Under ultraviolet (UV) irradiation, the high efficient crosslinking reactions of polyethylene molecules are facilitated by the auxiliary crosslinkers that have been grafted onto the surfaces of silica nanofillers in polyethylene matrix. With the UV-initiated crosslinking technique, the crosslinking degree, insulation performance, and space charge characteristics of SiO2/XLPE nanocomposites are investigated in comparison with the XLPE material. Due to the combined effects of the high dispersion of nanofillers and the polar-groups of TAIC grafted on the surfaces of SiO2nanofillers, the functionlized-SiO2/XLPE nanocomposite with an appropriate filling content represents the most preferable crosslinking degree with multiple improvements in the space charge characteristics and direct current dielectric breakdown strength. Simultaneously employing nanodielectric technology and functional-group surface modification, this study promises a modification strategy for developing XLPE nanocomposites with high mechanical and dielectric performances.
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高影响因子
Advanced Materials Interfaces
·
2017
·Vol. 4
·期 13
·1700268
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IF 4.279
Shu Deng,Jianying Huang,Zhong Chen,Yuekun Lai
Superhydrophobic surfaces in nature have attracted a great deal of interest not only for fundamental understanding but also for practical applications through mimicking the nature. Fluorochemicals, due to their intrinsic low surface energy, have been widely applied as artificial superhydrophobic functionalization materials with excellent performance. However, the use of these materials for practical applications might be restricted due to the relative high cost and potential hazards to human health. In this work, a low-cost and environmentally friendly short silane chain material is developed for fabricating superhydrophobic surfaces. A transparent photoactive coating is obtained by polycondensation of trichlorovinylsilane on cotton fabrics. The coating shows excellent superhydrophobicity. After being grafted with vinyl group, the coating can be easily functionalized using a photoclick thiol-ene reaction. The thiol-ene reaction has resulted in highly uniform polymer networks, which makes it possible to realize the rapid wettability switch from superhydrophobic to superhydrophilic state. Such ability makes it potentially viable to prepare well-defined cotton patterning by printing, and realize flexible electronic devices when electrodes are printed on the fabrics.
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高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Liang Chu,Zhengfei Qin,Wei Liu,Xin’guo Ma
The surface modification to inhibit charge recombination was utilized in dye-sensitized solar cells (DSSCs) and self-powered ultraviolet (UV) sensors based on SnO 2 hierarchical microspheres by TiO 2 modification. For DSSCs with SnO 2 photoelectrodes modified by TiO 2 , the power conversion efficiency (PCE) was improved from 1.40% to 4.15% under standard AM 1.5G illumination (100 mW/cm 2 ). The electrochemical impedance spectroscopy and open-circuit voltage decay measurements indicated that the charge recombination was effectively inhibited, resulting in long electron lifetime. For UV sensors with SnO 2 photoelectrodes modified by TiO 2 layer, the self-powered property was more obvious, and the sensitivity and response time were enhanced from 91 to 6229 and 0.15 s to 0.055 s, respectively. The surface modification can engineer the interface energy to inhibit charge recombination, which is a desirable approach to improve the performance of photoelectric nanodevice.
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高影响因子
Chemical Engineering Journal Advances
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2020
·
IF 0
Hanlu Yan,Minghan Luo,Qiuwen Chen,Taeseop Jeong,Jianyun Zhang,Li Wang
Eliminating tetracycline antibiotics from waste streams by conventional water treatment techniques remains challenging. Vacuum-ultraviolet/ultraviolet (VUV/UV)-based advanced oxidation technique is a promising, environment-friendly alternative to remove micropollutants from wastewater without adding chemicals. This study carried out flow-through experiments and numerical modeling to determine the efficiency and mechanism of VUV/UV process in degrading oxytetracycline (OTC) via a newly developed photoreactor with tangential inlet and outlet. OTC degradation pathway and reaction rate constant were identified through semi-batch experiments at various initial OTC concentrations in different water matrices. The decomposition of OTC by the VUV/UV process was as effective as that by the H 2 O 2 /UV approach but generated less byproducts and thus could be beneficial for process control. Removal of organic matter and inorganic ions were suggested before VUV/UV process to improve the treatment efficiency. Flow characteristics simulated by computational fluid dynamics (CFD) revealed that a special bidirectional spiral flow was formed in the new reactor, which improved the mixing efficiency of fluids and thus enhanced the contact between hydroxyl radicals and the contaminant. The distribution profiles of OTC and hydroxyl radicals confirmed that the target contaminant was decomposed following the flow direction, and the degradation efficiency could be further increased by decreasing the internal diameter of the photoreactor. The electrical energy-per-order analysis of the photoreactor proved the high-energy utilization efficiency and cost-effectiveness of the VUV/UV process.
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DOI
CHEMOSPHERE
·
2022
·
IF 8.943
Zhangbin Pan,Zhenqi Du,Junqi Jia,Aiguo Lin,Yongqiang Wang,Wuchang Song,Shaohua Sun,Hongbo Wang,Ruibao Jia,Lian Hou
2,6-dichloro-1,4-benzoquinone (DCBQ), a typical representative of Halobenzoquinones, is an emerging aromatic disinfection by-product (DBP) with high toxicity and carcinogenicity , generated commonly through the chlorination in the drinking water disinfection process while there is still a lack of research on its removal. In this study, the effects of ultraviolet-based advanced oxidation processes (UV-AOPs) on the degradation of DCBQ were evaluated. The results showed that UV-AOPs are effective in degrading DCBQ. The removal of DCBQ by UV/H 2 O 2 /O 3 was more significant than by UV/H 2 O 2 or UV/O 3, achieving a 96.7% removal rate at both the O 3 and H 2 O 2 doses of 1 mg/L. The results also indicated the alkaline and weakly acidic environments could facilitate the degradation of DCBQ, inorganic anions could inhibit DCBQ degradation and the degree of inhibition increased as the matrix concentration increased. The degradation of DCBQ was inhibited more by the CO 3 2− than the other matrix components, such as Cl − and NO 3 − . It was shown by the density functional theory simulations and the ultrahigh-performance liquid chromatography (UPLC) - Orbitrap mass spectra that the electrons in DCBQ are mainly on the chlorine atom connected to the carboatomic ring and that OH• can attack the chlorine atom to cause de-chlorination. The DCBQ degradation pathway may involve the oxidation of DCBQ to 3-hydroxy-2,6-DCBQ (HO–DCBQ) and 3,5-dichloro-1,2,4-pyrogallol, the further degradation of intermediate products by OH• to dechlorinated forms of HO–DCBQ and DCBQ.
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Qiyuan Chen,Lu Liu,Lifen Liu,Yizhen Zhang
Emissions of volatile organic compounds (VOCs) air pollutants could worsen air quality and adversely affect human health, thus developing more efficient low-temperature VOCs removal techniques is desired. A novel continuous system integrating UV-assisted photo-electrochemical catalysis with microbial fuel cell (UV-assisted PEC-MFC) has been established for promoting removal of gaseous ethyl acetate or toluene and generating electricity simultaneously. In this system, CeO 2 /TiO 2 /ACF catalytic cathode is prepared and used for combination with bio-anode for accelerating cathodic reaction . This UV-assisted PEC-MFC system exhibits an excellent elimination capacity (EC) of ethyl acetate (∼0.39 g/m 3 , EC: ∼2.52 g/m 3 /h) or toluene (∼0.29 g/m 3 , EC: 1.89 g/m 3 /h) under close-circuit condition. Furthermore, an outstanding elimination capacity (EC: 28.04 g/m 3 /h) for high concentration toluene (∼4.10 g/m 3 ) removal is obtained after toluene gas passes sequentially through the catalytic cathode then the bio-anode. This way of PEC degradation and biodegradation, avoids inhibition of exoelectrogens activity from toxicity of high concentration toluene. Simultaneously, the cell voltage of UV-assisted PEC-MFC system is stable at 0.11 V (vs. SCE) and 1.452×10 −4 kWh is generated from treatment of toluene gas stream in 6 h duration time. The possible mechanism of VOCs removal in this novel system has been proposed and discussed. This study provides new technical basis for treating gaseous pollutants via integrating photo-electrochemical catalysis with electricity generating microbial fuel cell for energy conversion.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Lan Chen,Xiaoxiao Wei,Huan Wang,Min Yao,Liming Zhang,Göran Gellerstedt,Mikeal E. Lindström,Monica Ek,Shuangfei Wang,Douyong Min
An ionization difference UV–Vis method ( Δε -spectrum method) is the most potentially simple method for fast quantitation of phenolic hydroxyl groups (ph-OH) in lignin. However, the underestimated results were calculated from the conventional Δε -spectrum method using one- or two-point wavelengths measurement. In this study, a modified Δε -spectrum method using multi-point wavelengths measurement was developed and the negative absorbance was also considered. Four main typical lignin models, e . g . vanilla alcohol, 5-5 biphenyl , stilbenoid and vanillin , were applied as the guaiacyl-type (G-type) phenolic models for the determination of ph-OH by the modified Δε -spectrum method. The 2-methoxyethanol/water/acetic acid = 8/2/0.2 ( V /V/V) was used as the acidic solvent system and the 2-methoxyethanol/0.2 M NaOH solution = 1/9 ( V /V) was used as the alkaline solvent system. The ph-OH contents in the spruce milled wood lignin (SMWL) and the spruce Kraft lignin (SKL) were respectively quantified by the modified Δε -spectrum method as 1.078 and 4.348 mmol/g, which were comparable to the counterparts determined by 31 P Nuclear Magnetic Resonance Spectroscopy ( 31 P NMR). The results revealed that the modified Δε -spectrum method can provide more accurate and reliable results compared to the conventional method.
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DOI
高影响因子
OPTIK
·
2020
·
IF 2.187
Ghorban Asgari,Abdolmotaleb Sidmohammadi,Ali Reza Rahmani,Mohamah Reza Samargandi,Hossein Faraji
This study was conducted to investigate the performance of sodium hydrosulfite-mediated photoreduction (SMP) process for the reduction of the pentachlorophenol (PCP). The influence of various parameters, quenchers and anions in water, were investigated on the performance of the SMP. The PCP degradation rates by SMP, UV alone and sodium hydrosulfite alone were achieved 100 %, 65 % and 16 %, respectively (under optimum conditions: sodium hydrosulfite dosage, 100 mg L −1 ; pH, 7.0 and reaction time, 80 min). Also, the kinetic studies confirmed the superiority of SMP than the other process (r obs values for SMP were 69 and 9.8 times of the sodium hydrosulfite alone and UV alone, respectively).Under the selected conditions 56 % of total organic carbon (TOC) was mineralized. The amounts of energy consumed for SMP, UV alone and sodium hydrosulfite alone were estimated 16, 35 and 19 and kWh m -3 , respectively. The results indicated adding quenchers in the solution, significantly was declined degradation performance . Therefore, it was found the SMP process due to smaller total cost and energy consumption and also the higher r obs , might be an efficient method for the removal of pentachlorophenol form aqueous solution.
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高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Ze-Chen Gao,Yi-Li Lin,Bin Xu,Ying Xia,Chen-Yan Hu,Tian-Yang Zhang,Hao Qian,Tong-Cheng Cao,Nai-Yun Gao
The effect of bromide and iodide on the transformation of humic acid (HA) and algal organic matter (AOM), and the formation of disinfection by-products (DBPs) during UV/chlorination were investigated. Experimental results indicated that the halides effectively inhibited mineralization, with multiple changes in organic molecule transformation due to differences in formation and speciation of reactive halogen species and free halogen. As a consequence, bromide and iodide also played important roles in DBP formation. The DBP yields in HA-containing water during UV/chlorination decreased in the order of iodide loaded > freshwater ≫ bromide loaded, whereas DBP formation in AOM-containing water decreased remarkably with halides added (freshwater > bromide loaded ≫ iodide loaded) at high UV fluence . Moreover, Pearson correlation analysis exhibited weaker correlation between DBPs and water parameters in AOM-containing water, while DBPs in HA-containing water exhibited better correlation with water parameters. For both simulated waters, the theoretical toxicity was calculated and peaked in bromide-containing water, whereas the calculated toxicity in iodide-containing water was comparable or slightly higher than that in freshwater. Therefore, UV/chlorine treatment may achieve good quality water with reduced DBP-associated toxicity in freshwater or iodide-containing water (iodide only), but careful consideration is needed when purifying source waters containing bromide (bromide only), especially for AOM/bromide-containing water.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hong Chen,Can Peng,Lei Wang,Xiaoxia Li,Mei Yang,Huanhuan Liu,Haili Qin,Weidong Chen
Polymeric hydrogels prepared using organic crosslinking agents usually possess severely heterogeneous aggregation of crosslinking points because of their irregular free-radical polymerization, and the resulting mechanically weak and brittle properties greatly limit their potential applications. A straightforward strategy to improve their mechanical performance can be a combination of a uniform polymer network and a high healing capability, beneficial to restoring their structures and properties for practical applications. Herein, a facile and general strategy was reported to fabricate mechanically tough and highly efficient healable hydrogels composed of a chemically crosslinked network and metal-ligand coordination crosslinks, accompanied with highly stretchable, elastic and notch-insensitive properties. Combined with ultraviolet (UV)-responsive organic crosslinking agents, the resulting hydrogels made it possible to improve the dispersion of crosslinking points in the polymer network. The mechanical strength could be further enhanced through the introduction of metal ions (e.g., Ag + , Mn 2+ , Fe 3+ , Co 2+ , Ni 2+ , and Cu 2+ ) in the formation of metal coordination interaction. Excitingly, in light of dynamic metal-ligand coordination as a healing motif, an optimal healing efficiency of 85% in 30 s could be achieved when exposed to microwave irradiation. Furthermore, hydrogels with excellent antibacterial activity and cell viability have been demonstrated, showing great potential as surgical dressings to accelerate wound closure.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jun Ma,Zhou Yufeng,Jing Xu,Lin Gu,Guoqiao Lai,Bin Chen,Shuan Liu,Haichao Zhao,Haibin Yu,Jianmin Chen
Photopolymerization of urethane acrylate (PUA) containing solution-processable dibutyl-substituted poly(3,4-propylenedioxythiophene) (Poly(ProDotBu2)) was applied on Q235 carbon steel. The corrosion resistance of as-prepared composite coatings with various contents of Poly(ProDotBu2) was studied by electrochemical techniques including open-circuit potential (OCP), potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). It was observed that the PUA/Poly(ProDotBu2) composite coatings exhibited an excellent corrosion resistance and barrier properties in comparison with pure PUA coating.
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高影响因子
危险品化学品经营许可证（带存储）