JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Juntao Wang,Shao-Lu Li,Yaxu Guan,Can Zhu,Genghao Gong,Yunxia Hu
Membrane fouling and degradation caused by free chlorine oxidation seriously hinder the long-term operation of aromatic polyamide (PA) thin-film-composite (TFC) membranes. In this study, sulfonamide monomers 4-aminobenzene sulfonamide (4-ABSA) and 2-aminoethanesulfonamide (2-AESA)) were facilely grafted onto the PA RO membranes surface via layer-by-layer interfacial polymerization (LbL-IP) method, endowing with much improved water flux, antifouling, and chlorine-resistance properties. The chemical compositions and surface properties of the RO membranes were systematically investigated by various techniques, as FTIR and XPS results clearly showed that sulfonamide groups were successfully grafted onto RO membranes’ surface. Compared to the pristine membrane, the water flux of the two modified membranes increased by 50.8% and 59.1%, reached 3.65 ± 0.15 L m −2 h −1 bar −1 and 3.85 ± 0.05 L m −2 h −1 bar −1 , respectively, meanwhile their NaCl rejection remained above 99.25 ± 0.08%. Due to the improvement of surface hydrophilicity and decrease of surface roughness , the antifouling performance of the modified membranes was greatly improved. Moreover, the N–H moieties on sulfonamide can act as sacrificial units for free chloride attack to significantly improve the chlorine-resistance performances of the modified RO membranes compared to the pristine one, with NaCl rejection remain above 98.95 ± 0.09% after chlorination intensity of 8000 ppm⋅h under acidic condition of pH 4. This simple and efficient surface grafting strategy and modifying materials make it have great application potential in the field of water treatment.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 9
·646
·
IF 3.8
Jingfei Luan,Yang Xiao,Liang Hao,Ye Yao,Bowen Niu,Guangmin Yang,Yichun Wang
For the first time, a novel catalyst named Dy2EuSbO7was successfully synthesized via the high-temperature solid-state sintering method (HTSSM). Dy2EuSbO7/ZnBiDyO4heterojunction photocatalyst (DZHP) was fabricated through the HTSSM for degrading chlorpyrifos (CPS) in the pesticide wastewater under visible light irradiation (VSLID). Under VSLID, DZHP could effectively degrade CPS in pesticide wastewater. The experimental outcomes suggested that the kinetic curve with the Dy2EuSbO7/ZnBiDyO4heterojunction (DZH) as a photocatalyst for the reduction of CPS under VSLID conformed to the first-order kinetics (FOKT). After VSLID of 156 min, the photocatalytic degradation (PTD) removal rate of CPS using DZH as photocatalyst was 1.12 times, 1.21 times, or 2.96 times that using Dy2EuSbO7as a photocatalyst, ZnBiDyO4as a photocatalyst, or nitrogen-doped titanium dioxide as a photocatalyst. After VSLID of 156 min for four cycle degradation tests (FCDTS) with DZH as a photocatalyst, the removal rate of CPS reached 98.78%, 97.66%, 96.59%, and 95.69%, respectively. Above results indicated that the DZHP possessed high stability. Experiments with the addition of trapping agents showed that hydroxyl radicals (•OH) owned the strongest oxidative removal ability for degrading CPS compared with superoxide anions (•O2−) or holes (h+). The oxidation capacity of three oxidation radicals for eliminating CPS was ranked in the ascending order as follows: h+< •OH < •O2−. Lastly, the possible degradation pathway and degradation mechanism of CPS were discussed in detail. A visible light responsive heterojunction catalyst with high catalytic activity and a photocatalytic reaction system which were capable of efficiently removing toxic organic pollutants from pesticide wastewater were obtained.
研究领域:
环境科学
·
催化材料科学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2023
·Vol. 10
·期 6
·065003
·
IF 2.3
Liangyu Jia,Weihao Jin,Weiwei Zhang,Jun Wang,Wanzhen Li,Yugui Tao
Green foods are usually harvested and stored before ripening, but excessive ethylene generated during storage can lead to the loss of vegetables and fruits. Photocatalytic oxidation provides a promising method to remove ethylene and extend the shelf life of green foods. In this study, a mesoporous nanosilica-loaded Ce6 composite nanomaterial (Ce6@SiO2) was designed and synthesized to adsorb ethylene into its pores and then degrade it under visible light illumination. The photosensitizer Ce6 in the mesopore produced large amounts of reactive oxygen species that degraded ethylene. The specific surface area was greatly increased by coating the material on the surface of a sodium alginate (SA) hydrogel membrane. This improved its degradation efficiency and facilitated the adsorption and degradation of ethylene during fruit storage. The ethylene removal capacity was studied by measuring the ethylene concentration and increases in the humidity in Tedlar gas bags. Practical applications were tested by observing color changes and surface decay of tomatoes stored with and without SA/Ce6@SiO2. The results showed the system may be used in practical commercial preservation systems.
研究领域:
食品科学
·
材料科学
·
植物生理学
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 35
·期 7
·e6245
·
IF 4.105
Ruonan Ma,Zhiyin Xiao,Wei Zhong,Chunxin Lu,Zhongquan Shen,Dan Zhao,Xiaoming Liu
Cuprous halides, best described as (CuX) n (X = Cl − , Br − , and I − ) in their solid state, catalyse selective aerobic oxidation of alcohols with the assistance of both NMI ( N -methylimidazole) and TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl), and the iodide generally demonstrates the highest activity, for example, in the oxidation of 1-octanol at ambient temperature under 24 h' reaction. However, in the aerobic oxidation of benzylic alcohols, the chloride showed superiority to the iodide in that the aerobic oxidation was quantitatively completed within 3 h at ambient temperature whereas the iodide showed only about half the activity of the chloride analogue. By probing the system using electrochemistry, electric conductivity, and 1 H NMR titration, it was revealed that the surprising anomaly was due to the difference in the rate of forming active species, [Cu (NMI) 2 X(MeCN)], from the polymeric solid in a two-stage process. Substrates expansion of 11 benzylic alcohols indicated that CuCl/NMI/TEMPO system demonstrated quantitative conversion of benzylic alcohols into corresponding aldehydes within 3 h and showed great tolerance to the substituents on the phenyl ring of the substrates. Furthermore, electron-withdrawing substituent was beneficial to the oxidation and could offset the steric effect at orthro -substituent. Such a behaviour suggested that in the catalysis, increasing the acidity of the hydroxyl group (OH) of the substrates could ease the oxidation, which implied that the deprotonation via an internal pathway might be one of the rate-determining steps. Our results also showed that the anion halide participated actively in the catalysis by coordinating to Cu(I) in the active species.
研究领域:
化学
·
催化反应
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Ping Tang,Wenchao Jiang,Shuguang Lyu,Zhaofu Qiu,Qian Sui
The degradation of carbon tetrachloride (CT) by Fe(II) activated calcium peroxide (CaO 2 ) in the presence of ethanol (CH 3 CH 2 OH, EtOH) was investigated. The results showed that CT could be completely degraded in 20 min with 3.90 mmol L −1 CaO 2 , 5.20 mmol L −1 Fe(II) and 1.30 mmol L −1 EtOH in CaO 2 /Fe(II)/EtOH system. Superoxide radical anion (O 2 •− ) and hydroxyethyl radical ( • CHCH 3 OH, HER) were demonstrated as the main radicals for CT degradation which were confirmed by scavenging tests and electron paramagnetic resonance (EPR) detection. The mechanism of CT degradation was mainly due to the split of C–Cl and CT degradation pathway was proposed accordingly. Further investigation suggested that the solution pH in range of 3–5 were favorable to CT degradation. Both Cl − and HCO 3 − had inhibitive effect on CT removal, while the influence of NO 3 − and SO 4 2− could be negligible. Moreover, the results of experiments performed using actual groundwater demonstrated that an adverse impact occurred on CT degradation, but this drawback could be overcome by increasing reagent dosages. In summary, CT degradation in Fe(II) activated CaO 2 system can be significantly promoted by EtOH addition, and this finding, for the first time, provides an innovative technology for degradation of the highly oxidized organic contaminants.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 33
·50809
·
IF 3.125
Fei Song,Caoxing Huang,Xinbao Zhu,Chengguo Liu,Yonghong Zhou,Puyou Jia
An epoxidized cardanol tungoleate (ECT) based on tung oil and cardanol was synthesized through esterification and epoxidation. The chemical structure of the compound was verified by Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance ( 1 H-NMR). The plasticizing effects of ECT as the main plasticizer in poly(vinyl chloride) (PVC) was studied and compared with the commercial plasticizer dioctyl phthalate (DOP). The thermal migration stabilities, the thermal degradation process and the mechanical properties of PVC samples and the plasticization mechanism of ECT for PVC were investigated through the use of volatility, extraction, discoloration, and tensile tests as well as thermal gravity analysis (TGA), TGA–FTIR analysis, electronic universal testing machine and dynamic mechanical analysis (DMA). Compared with DOP, the ECT plasticized PVC can exhibits better thermal stability, more excellent tensile strength (17.28 MPa) and higher stretchability (629.41%), which is 1161% higher than DOP (1.37 MPa) plasticized PVC film. In addition, the migration resistance and volatility stability of ECT are much better than DOP. Therefore, this fully bio-based plasticizer based on tung oil and cardanol is a promising alternative plasticizer for PVC and may be an excellent phthalate substitute from the perspective of human health and sustainable development.
研究领域:
材料科学
·
环境科学
✓ 已验证
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.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 9
·1183-1195
·
IF 4.5
Yang Qian,Zhang Lin,Xie Xiao,Sun Qiong,Feng Jianguang,Dong Hongzhou,Song Na,Yu Liyan,Dong Lifeng
Improving the performance of reverse osmosis membranes remains great challenge to ensure excellent NaCl rejection while maintaining high water permeability and chlorine resistance. Herein, temperature-responsive intelligent nanocontainers are designed and constructed to improve water permeability and chlorine resistance of polyamide membranes. The nanocontainer is synthesized by layer-by-layer self-assembly with silver nanoparticles as the core, sodium alginate and chitosan as the repair materials, and polyvinyl alcohol as the shell. When the polyamide layer is damaged by chlorine attack, the polyvinyl alcohol shell layer dissolves under temperature stimulation of 37 °C, releasing inner sodium alginate and chitosan to repair broken amide bonds. The polyvinyl alcohol shell responds to temperature in line with actual operating environment, which can effectively synchronize the chlorination of membranes with temperature response and release inner materials to achieve self-healing properties. With adding temperature-responsive intelligent nanocontainers, the NaCl rejection of thin film composite membrane decreased by 15.64%, while that of thin film nanocomposite membrane decreased by only 8.35% after 9 chlorination cycles. Effective repair treatment and outstanding chlorine resistance as well as satisfactory stability suggest that temperature-responsive intelligent nanocontainer has great potential as membrane-doping material for the targeted repair of polyamide reverse osmosis membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2020
·Vol. 15
·期 4
·1-10
·
IF 4.053
Liu Xuefeng,You Shijie,Ma Fang,Zhou Hao
Electrode fouling is a problem that commonly occurs during electro-oxidation water purification. This study focused on identifying the fouling behavior of Pt electrode associated with the formation of polymeric layer during electro-oxidation of phenol. The in situ electrochemical measurements and non-destructive observation of the electrode morphology were reported. The results demonstrated that the electrode fouling was highly dependent on thermodynamic process of electrode that was controlled by anode potential. At anode potential lower than 1.0 V vs SHE, the direct electro-oxidation caused the electrode fouling by the formation of polymeric film. The fouling layer decreased the electrochemically active surface area from 8.38 cm 2 to 1.57 cm 2 , indicated by the formation of polymeric film with thickness of 2.3 µm, increase in mass growing at a rate of 3.26 µg/cm/min. The degree to which the anode was fouled was independent of anion in the electrolyte. In comparison, at anode potential higher than 2.7 V vs SHE, the anions (e.g., chloride) could exert a major influence to the behavior of electrode fouling. The presence of chloride was shown to mitigate the fouling of electrode significantly through preventing the formation of polymeric film by active chlorine (e.g., Cl• and Cl 2 ) produced from anodic oxidation of chloride. Since chloride is the most abundant anionic species existing in both natural and engineered water system, this study not only offers a deep insight into the mechanism of electrode fouling, but also suggests strategies for anti-fouling in the presence of chloride in electro-oxidation process.
研究领域:
环境科学
·
电化学工程
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Yuanyuan Li,Lei Liu,Yong Tang,Yun Wang,Juan Han,Liang Ni
In this study, a new fluorescence probe HMAQ based on quinazoline and diaminomaleonitrile was constructed for sensing ClO − and Al 3+ . A fluorescence blue-shift with 102 nm together with a color change from golden-yellow to colorless was found by hypochlorite-induced hydrolysis of –CH=N- group to release the initial fluorophore. Besides, Al 3+ could cause a 72-nm blue-shifted emission spectra and a color change from golden-yellow to brown. As expected, HMAQ exhibited a satisfactory selectivity and sensitivity to ClO − /Al 3+ with a quick response. Most notably, the reversibility of the [HMAQ+Al 3+ ] complex could be used to detect ClO − and Al 3+ simultaneously without mutual interferences. The detection limits of HMAQ for ClO − and Al 3+ were turned out to be 10.2 nM and 1.56 nM, respectively. The high-performance results of real-time detections demonstrated the enormous potential of HMAQ in real-water samples and living cells.
研究领域:
分析化学
·
生物医学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Wei He,Zheng Fang,Qitao Tian,Weidong Shen,Kai Guo
In this study, a novel protocol consisting of peroxidatic reaction and epoxidation process was developed. Besides, a specific continuous extraction apparatus was also employed in the continuous flow synthesis process. Without additional purification, m-chloroperbenzoic acid (m-CPBA) generated in situ could react with cyclohexene, leading to high quality cyclohexene oxide. In the first stage, m-CPBA was obtained within a few seconds at room temperature by reacting m-chlorobenzoyl chloride with hydrogen peroxide, while cyclohexene oxide was prepared at 30 °C for 10 min in the following stage.
研究领域:
有机化学
·
化学工程
✓ 已验证
DOI
高影响因子
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
·
2018
·Vol. 39
·期 5
·611-617
·
IF 0.522
Qi Sun,Jianmei Li,Tao Le,Lei Zhang
Herein, a facile and enzyme-free CP sensor was fabricated by in situ electrochemical reduction strategy on the surface of glassy carbon electrode (GCE). Reduced graphene oxide (RGO) was chose as supporting materials for the distribution of platinum nanoparticles (Pt NPs) to obtain improved catalytic properties. The applicability and suitability of the obtained RGO-Pt/GCE for 4-CP detection were also evaluated. The results indicated that the RGO-Pt NPs modified electrode displayed much better catalysis and higher sensitivity for 4-CP oxidation. Under optimum conditions, the oxidation peak current was proportional to 4-CP concentration in the range from 0.1 to 500 μM with a detection limit of 51 nM. Meanwhile, it is demonstrated that the prepared sensor is also characterized by excellent feasibility, satisfactory reproducibility, good stability and high specificity. The results suggested that RGO-Pt/GCE could be a facile, cost-effective, and rapid tool for the prospect on-line evaluation of 4-CP in drinking water samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）