FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 7
·2669-2682
·
IF 2.2
Luo Laipeng,Ding Chenkun,Zhu Qinting,Liu Lei,Wang Ping,Wang Qiang,Yu Yuanyuan
Untreated natural cotton fabrics are hydrophobic due to the high content of pectin and waxes, and the fabrics need to improve the wettability by scouring for the demands of the subsequent processing such as dyeing and finishing. In this study, a new scouring method for cotton fabrics was developed by pectin hydrolase combined with Fenton system (Fe 2+ /H 2 O 2 ). The mechanism of pectin degradation by pectinase combined with Fe 2+ /H 2 O 2 was investigated. The results showed that α-1,4-glycosidic bonds of water-soluble pectin could be degraded more efficiently by pectinase hydrolysis and Fe 2+ /H 2 O 2 oxidation. The fabrics scoured with pectinase → Fe 2+ /H 2 O 2 had less wetting time (4.25 s) and higher vertical wicking height (9.80 cm) compared to the fabrics treated with pectinase alone (> 120 s, 5.15 cm). The results of bleaching and dyeing experiments indicated that the whiteness and dyeing properties of the fabrics were not negatively affected by pectinase → Fe 2+ /H 2 O 2 treatment, and the strength loss of the fabrics (11.79%) was lower than that of the fabrics with conventional NaOH treatment (20.16%). The results of the experiments in the pilot-scale machine showed that various performance indicators of the fabrics scoured by pectinase → Fe 2+ /H 2 O 2 reached the level of the conventional NaOH treatment, which demonstrated the possibility for practical application of pectinase → Fe 2+ /H 2 O 2 scouring. The cotton fabric scouring using pectinase → Fe 2+ /H 2 O 2 is an effective and feasible new method with advantages such as environmental friendliness, mild treatment conditions, and good treatment effect.
研究领域:
纺织科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Huiwang Dai,Shuying Xu,Jianxin Chen,Xiaozeng Miao,Jianxi Zhu
Oxalate enhanced mechanism of Fe 3 O 4 @γ-Fe 2 O 3 was developed to provide novel insight into catalytic process regulation of iron oxide catalysts in heterogeneous UV-Fenton system. And the iron oxide composite of Fe 3 O 4 @γ-Fe 2 O 3 was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FTIR) spectroscopy and nitrogen adsorption-desorption isotherms. The results showed that large amount of iron could be leached from catalyst in the presence of oxalate, which promoted the homogeneous UV-Fenton reactions in solution. Orange II degradation could be significantly enhanced with the increase of the ratio of homogeneous UV-Fenton process to heterogeneous UV-Fenton process. The optimum concentration of oxalate determined by experiment was 0.5 mM in oxalate enhanced heterogeneous UV-Fenton system. On this condition, the pseudo-first-order rate constant value of Orange II degradation was 0.314 min −1 , which was 2.3 times as high as that in heterogeneous UV-Fenton system. The removal rates of color and TOC were 100% and 86.6% after 20 min and 120 min treatment, respectively. In addition, the iron ions in solution could be almost completely adsorbed back to the catalyst surface in later degradation stages of Orange II. During the recycle experiments, the results showed that the increase of pH in solution and the sorption of intermediates on the catalyst surface would hinder oxalate enhanced process and lead to a decrease of degradation rate of Orange II in oxalate enhanced heterogeneous UV-Fenton system.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Xiaozeng Miao,Huiwang Dai,Jianxin Chen,Jianxi Zhu
An enhanced method of hydroxyl radical generation was studied to lead a better understanding of the catalytic mechanism of α-FeOOH in UV-Fenton system. The catalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption–desorption isotherms and scanning electron microscope. The Orange II degradation and hydroxyl radical concentration under different conditions were studied in detail. The results showed that the hydroxyl radical was mainly oxidizing species for Orange II degradation. And the hydroxyl radical generation included both homogeneous and heterogeneous UV-Fenton processes. In heterogeneous UV-Fenton system, the additional oxalate could increase the ratio of homogeneous UV-Fenton process for hydroxyl radical generation. In oxalate enhanced system, the peak value of hydroxyl radical concentration would increase to 11.314 μmol/L which was nearly twice as it in heterogeneous UV-Fenton system (5.978 μmol/L). The k values of Orange II discoloration and mineralization increased to 0.386 min −1 and 0.044 min −1 , which were 1.169 and 0.692 times as that in heterogeneous UV-Fenton system (0.178 min −1 and 0.026 min −1 ). After treatment, the total iron ions concentration decreased to 2.357 μmol/L in oxalate enhanced system. The results indicated that additional oxalate was a promising enhanced method for hydroxyl radical generation in heterogeneous UV-Fenton system with α-FeOOH as catalyst.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Shenjun Wang,Xiaonan Tan,Yuhao Wu,Jun Zhang,Zhiyuan Tian,Jiahai Ma
Rapid isolation of microplastics is the prerequisite for correct and in-depth understanding of their environmental impacts and human health threats. And Fenton’s reagent (Fe/H 2 O 2 system, FHS) has been proven to be a viable way to isolate microplastics from wastewater, but it is limited because of harsh reaction conditions, long reaction time and low efficiency. Herein, it's proven that the Fenton-like system, which is using Cobalt (II) salts to decompose potassium peroxymonosulfate (Co/PMS system, CPS) with generation of 1 O 2 , can offer shorter time (within 30 min) in complex sample isolation. The experimental results showed that the isolation time of micro/nanoplastics from pollutants with CPS in only 30 min, while it was at least more than 5 h with FHS. Via a serious of experiments of comparison and characterization between FHS and CPS, whether from the point of view of reaction time or isolation effect , CPS is superior to FHS. On this basis, we validate the applicability of this system (CPS) in different reaction conditions (concentration, pH), different sizes (from microns to nanometers) and types of plastic (PS, PA, PE, PP, PVC). In addition, the CPS can also preserve the integrity of the plastic itself and reduce the impact on the quality of samples evidenced by a variety of characterization of physicochemical structure like UV–vis, TEM, AFM , FTIR and XPS. CPS is proved to be faster, higher, stronger for enhancing the isolation of micro/nanoplastics from complex matrix. In a word, this study provides a promising solution for the efficient isolation of microplastics from wastewater without causing additional harm to the plastics.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Huiwang Dai,Xiaozeng Miao,Jianxi Zhu,Jianxin Chen
The redox cycle of iron is a well-known rate-determining step for hydroxyl radical generation in photo-Fenton system. In this study, oxalate was employed as regulator to enhance the degradation of Orange II in Fe 3 O 4 magnetic nanoparticles (NPs)-catalyzed heterogeneous UV-Fenton system. Results showed that the oxalate could interact with the surface ≡Fe III species of catalyst, which weakened the bond of ≡Fe III –O and promoted the leaching of iron ions. Then the redox cycle of iron and generation of HO· would be accelerated via the homogeneous UV-Fenton reaction. The degradation rate constant of Orange II reached 0.220 min −1 when additional oxalate concentration was 0.4 mM, which was 2.5 times as high as that without oxalate in heterogeneous UV-Fenton system. In this case, the removal efficiencies of color and TOC were 99.3% and 92.0% after 30 and 120 min treatment, respectively. In addition, based on the results of XRD and XPS characterization, it could be deduced that the crystal structure and elemental configuration of Fe 3 O 4 magnetic nanoparticles could be maintained after reaction. Besides, the results of FTIR and magnetization characterization indicated that the C 2 O 4 2− on surface of catalyst could be degraded and the catalyst could be easily separated from aqueous by applying an external magnetic field. The Fe 3 O 4 magnetic nanoparticles showed high catalytic stability and reusability under the regulation of oxalate due to the fact that the leached iron ions could be re-adsorbed on the catalyst after treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Chen Wang,Yubei Liu,Mingjie Huang,Wei Xiang,Tao Zhou,Xiaohui Wu,Juan Mao
It was demonstrated in this study that appropriate concentrations of oxalate (Ox) would lead to greatly accelerated electro-generation of Fe 2+ but obviously lower power consumption in the Fered-Fenton system. Depending on the Ti electrode with pristine TiO 2 layer, effects of important parameters on the SMX degradation were investigated in the Fered-Fenton-Ox system. It was found that the heterogeneous interfacial electrochemically reduction of Fe III was critical in the Fered-Fenton-Ox system relying on the surface hydroxyl bonding Fe III -Ox and formation of Fe O Ti bonds. A heterogeneous-homogeneous reaction mechanism was therefore proposed. It included the heterogeneous interfacial electrochemical generation of Fe II -Ox and the heterogeneous-homogenous Fenton oxidation of pollutants. The promotional role of Ox would be also homogenous and heterogeneous, i.e. maintaining ferric at higher pH and forming specific Fe III -Ox complex as well as accelerating the solid-liquid interfacial heterogeneous iron cycle. Furthermore, a continuous-flow pilot study was conducted in treating a printing and dyeing industrial wastewater. As compared to conventional Fenton and Fered-Fenton systems, the Fered-Fenton-Ox system could achieve more efficient COD removal with a relative low cost/△COD, suggesting great advantages in its practical applications for treating real industrial complex wastewaters.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 13
·5447-5453
·
IF 1.821
Haiqian Zhao,Jihui Gao,Wei Zhou,Zhonghua Wang,Shaohua Wu
The reason for the prominent error in the hydroxyl radical detection method by UV-vis spectrophotometry with fast blue BB salt (FBBs) as the chromogenic agent was detected, and a modified method was proposed. The simultaneous extraction of FBBs in the diazosulfone extraction process was proven to have a distinct influence on the test results. In the modified method, FeSO4 was adopted to limit the extraction of FBBs by a toluene/butanol extraction agent, which sharply decreased the influence of FBBs on diazosulfone detection. The FBBs amount and extraction time played an important role in its extraction. The appropriate FBBs/MSIA ratio was 50, and the reasonable extraction time was 300 s for the modified method. ˙OH concentration in the directional decomposition of the Fenton system was detected. The test error was about 7%. This method is quite significant to test ˙OH quantificationally to better understand Fenton reaction mechanisms and promote the generation of ˙OH.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2024
·Vol. 137
·期 2
·1225-1238
·
IF 1.7
Wang Wanchun,Chi Yangxu,Sun Jiahong,Zhou Feng,Zhan Su
In this work, Ag/CuBi 2 O 4 composite photocatalyst films with excellent photocatalytic sterilization properties were prepared by photodeposition. The photocatalytic activity of silver-modified CuBi 2 O 4 (Ag/CuBi 2 O 4 ) under the photocatalytic-Fenton coupling system was verified by its inactivation rate of Escherichia coli in seawater. The results showed that the photocatalytic sterilizing performance of CuBi 2 O 4 loaded with Ag in the presence of trace amounts of H 2 O 2 was significantly improved. 15Ag/CuBi 2 O 4 possessed the optimal photocatalytic activity, and its sterilizing rate in 30 min could reach 96.6%. Its sterilization rate in 30 min could reach 96.6%, which is about 70% higher than that of pure CuBi 2 O 4 . Meanwhile, the mechanism of the enhanced sterilization performance of Ag/CuBi 2 O 4 in the photocatalytic-Fenton coupled system was investigated. Firstly, according to the electrochemical results, the loading of Ag can significantly improve the charge separation efficiency of CuBi 2 O 4 . And promotes the conversion of H 2 O 2 to hydroxyl radicals(·OH); Secondly, the valence band potential of 15Ag/CuBi 2 O 4 is more positive than that of CuBi 2 O 4 , which suggests that Ag loading can enhance the oxidation of CuBi 2 O 4 cavities. Comprehensive radical trapping experiments demonstrate that ·OH and holes (h + ) are the main active species for inactivating Escherichia coli (E. coli). In this work, effective conversion of H 2 O 2 to ·OH in a wide spectral range was achieved by loading Ag nanoparticles on the surface of CuBi 2 O 4 , which provides a new idea for the development of photocatalytic-Fenton coupling technology and ballast water treatment. Graphical abstract
研究领域:
环境科学
·
材料科学
·
光催化
·
微生物学
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2023
·Vol. 34
·期 4
·1751-1764
·
IF 4
Zhou Zhuyou,Zou Congyang,Wang Yong,Liu Menghe,Ji Yufeng
A one-step solvothermal synthesis technique was employed to fabricate C 60 /MIL-101(Fe) composites. The C 60 /MIL-101(Fe) composites showed a better performance in the degradation of methylene blue (MB) and tetracycline hydrochloride (TCH) when compared to MIL-101(Fe) in the photo-Fenton system, which can be credited to the charge transfer and separation facilitated by the addition of C 60 . Results showed that C 60 /MIL-101(Fe) had the capacity to nearly completely eliminate TCH and MB over a broad pH range. The catalysts demonstrated remarkable catalytic degradation on various organic pollutants and water samples. Through active substance quenching experiments and EPR, it was determined that hydroxyl radical (·OH) is the main factor in the photocatalytic reaction process.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）