CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Qizhan Zhang,Minghua Zhou,Zhicheng Lang,Xuedong Du,Jingju Cai,Lujie Han
High mineralization efficiency and low energy consumption are the core requirements for the application of electrochemical advanced oxidation processes (EAOPs) for organic pollutants degradation. Herein we reported innovative EAOPs using natural air diffusion electrode (NADE) to improve H 2 O 2 production and enhanced utilization efficiency by combination with electro-Fenton and photoelectro-Fenton (EF-PEF) for the degradation of 2,4-dichlorophenoxyacetic acid. At 0.2 and 1.2 A, the H 2 O 2 production on NADE possessed 158% and 188% of that on normal aeration electrode (AE) with the total energy consumption only 7.2% and 25.4% of that on AE, respectively. Such excellent H 2 O 2 production performance on NADE was attributed to ultra-high oxygen mass transfer efficiency and the feature of not requiring aeration, which reduced energy consumption greatly. A new H 2 O 2 utilization efficiency (HUE) evaluation index including decomposition ratio, conversion efficiency and total utilization efficiency of H 2 O 2 was proposed, demonstrating that PEF had a higher HUE than EF but not cost-effective due to a higher energy consumption. EF-PEF was thus proposed to upgrade the traditional PEF, which reduced energy consumption while maintained high mineralization efficiency. The HUE in EF-PEF process was greatly improved and superior to most reported EAOPs in literatures, which explained the high mineralization efficiency (78%–87%) with an extremely low energy consumption (0.065–0.167 kWh (g TOC) −1 ) even an order of magnitude lower than that in the literatures. This work enlightened the importance of two strategies of improving both H 2 O 2 production and utilization efficiency to maintain high mineralization efficiency in H 2 O 2 based EAOPs.
研究领域:
环境科学
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电化学工程
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DOI
高影响因子
COLORATION TECHNOLOGY
·
2015
·Vol. 131
·期 6
·439-443
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IF 1.262
Zongqian Wang,Weiguo Chen,Xuewei Zhou,Chaonan Liu,Keith Millington
Bleached silk is rapidly yellowed by exposure to the ultraviolet radiation present in sunlight. The conventional application of a water-soluble hydroxyphenyl benzotriazole ultraviolet absorber (such as UVFast W) to bleached silk reduces its rate of photoyellowing but has a negative impact on the whiteness of the bleached silk, largely cancelling out the improvements in whiteness achieved during bleaching. Therefore, a series of bleaching processes and aftertreatments using UVFast W on silk were investigated, with the measurement of reflection spectrum, whiteness, yellowness, and strength before and after exposure to ultraviolet radiation. The results show that whiteness of silk treated by oxidation–reduction double bleaching can be increased, and the whiteness of double-bleached silk with 4% UVFast W aftertreatment was even slightly higher than that of the hydrogen-peroxide-bleached silk. After ultraviolet irradiation, double-bleached silk samples with 4% UVFast W treatment resulted in both the highest whiteness and optimum photostability by comparison with unbleached standard silk and hydrogen-peroxide-bleached silk samples with and without 4% UVFast W treatment, and its strength difference was superior to the samples, except for standard silk with 4% UVFast W treatment after exposure to UV radiation for 18 h.
研究领域:
材料科学
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纺织工程
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光化学
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DOI
高影响因子
Journal of Cleaner Production
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2023
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IF 11.1
Jiajun Pan,Zhaopeng Xia,Haibao Zhang,Liwei Wu,Yang Lu,Yong Liu,Yujie Cao
Animal fibres are coloured using dyes to satisfy the individual needs; thus, dark animal fibres must be bleached. Compared with frequently used Fe 2+ -catalysed H 2 O 2 (Fe 2+ /H 2 O 2 ) bleaching, persulphate (PDS)/H 2 O 2 bleaching is advantageous owing to its high efficiency, low damage of fibre and environmental friendliness. Herein, different free radical species were precisely controlled by changing the pH of the PDS/H 2 O 2 solution and regulating the existence of NH 4 + . When NH 4 + was absent, sulphate radicals (·SO 4 − ) and hydroxyl radicals (·HO) could be produced at pH = 8–9 and superoxide anions (·O 2 − ) could be produced at pH = 10. In the presence of NH 4 + , ·SO 4 − and ·HO could be produced at pH = 8, and ·O 2 − was dominant in the solution when pH = 9–10. Black yak wool was used as the research object to demonstrate that the bleaching ability of the generated ·O 2 − was stronger than those of the generated ·SO 4 − and ·HO. Compared with that of the commercial product (prepared using Fe 2+ /H 2 O 2 bleaching), the bleaching time of the decolourised yak wool was reduced by 83.33% (from 24 to 4 h) without the catalysis by heavy metal ions . Meanwhile, the whiteness of the decolourised yak wool (72.31%) was close to that of the commercial product (78.79%). Furthermore, the damage to the cuticle layer and cortex of yak wool was low after bleaching. The breaking strength of the decolourised yak wool was 1.79 cN·dtex −1 , which only decreased by 17.13% compared with that of raw yak wool. These results hold great potential in developing environmental-friendly bleaching methods for dark animal fibres with high efficiency and low damage.
研究领域:
纺织科学
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环境科学
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DOI
高影响因子
SOLID STATE SCIENCES
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2024
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IF 3.4
Yao Wang,Pengzhan Zhang,Fan Li,Liang Zhang,Bing Xu,Kangkang Wang,Zhixian He,Yuyan Sun,Shengnan Zhang
Bi 3 NbO 7 loaded on porous carbon (BNO/PC) composite materials has been prepared by the in-suit sol-gel method. The photocatalytic efficacy of the BNO/PC composite has been evaluated by degrading tetracycline (TC) in an environment of visible light and hydrogen peroxide. Moreover, the relevant influencing factors of TC degradation efficiency have been explored through a series of condition optimization experiments. UV–vis DRS and PL tests showed that the loading on porous carbon significantly broadens the visible light response range of the catalyst and improves the separation efficiency of photogenerated carriers. Compared with the bare BNO, the specific surface area and average pore diameter of the BNO/PC composite material increased greatly. The optimal sample of 35 % BNO/PC exhibited outstanding visible light response ability and excellent charge separation efficiency. The “cata + H 2 O 2 +vis” system had the highest photocatalytic activity, with TC degradation reaching 86.9 % after 60 min of visible light illumination. The addition of hydrogen peroxide (H 2 O 2 ) promoted the formation of more powerful active substances. Following this, a mechanism for photocatalytic degradation has been proposed.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Zhen Li,Miao Gong,Mengqi Wang,Aixin Feng,Linlu Wang,Peiyong Ma,Shoujun Yuan
Hydrogen has attracted significant attention as a clean energy source. Supercritical water gasification (SCWG) technology can produce hydrogen-rich gas while also disposing of sludge. The hydrogen yield from the SCWG of sludge is greatly increased when catalyzed by AlCl 3 . In this paper, a combined catalyst based on AlCl 3 was proposed to further increase the hydrogen yield of SCWG of dewatered sewage sludge (DSS). Analysis of the products from catalytic gasified of DSS and its model compounds were used to propose a catalytic mechanism and reaction pathway of the catalytic SCWG of DSS. Among the combined catalysts used for the SCWG of DSS, 10 wt% AlCl 3 –H 2 O 2 (mass ratio 8:2) had the best hydrogen production effect, and the hydrogen yield reached 8.88 mol/kg organic matter. This was 14% higher than when catalyzed by 10 wt% AlCl 3 . During catalysis with AlCl 3 , Al 3+ reacted with OH − in water and precipitated as Al(OH) 3 , which produced an acidic environment in the liquid product. Al(OH) 3 dehydrated to form an AlO(OH) and deposited in the solid product. A small amount of H 2 O 2 promoted the steam reforming reaction of organic matter in DSS, which increased the hydrogen yield. H 2 O 2 further promoted the hydrogen yield in an acidic environment. The catalytic effect of AlCl 3 was unaffected by H 2 O 2 . The H + generated by AlCl 3 during catalysis promoted H 2 O 2 to further depolymerized organic matter (such as humic substances) in DSS, so that AlCl 3 –H 2 O 2 catalyzed the SCWG of DSS to further increase the hydrogen yield. The order of hydrogen yield catalyzed by AlCl 3 –H 2 O 2 was guaiacol > humic acid > glycerol > alanine > glucose. Compared with AlCl 3 , AlCl 3 –H 2 O 2 reduced the hydrogen yield of glucose by nearly 20% and increased the hydrogen yield of humic acid by about 17% (25.81 mol/kg feed).
研究领域:
环境科学
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能源工程
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2024
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IF 9.7
Jiajun Pan,Zhaopeng Xia,Haibao Zhang,Yang Lu,Yong Liu
Dark animal fiber is bleached to satisfy the demand of color diversity for clothing. Comparing with frequently-used Fe 2+ catalyzed H 2 O 2 (Fe 2+ /H 2 O 2 ) bleaching method, the ammonium persulfate (APS)/H 2 O 2 bleaching method based on the persulfate (PDS)-based advanced oxidation process is considered to be an environmentally animal fiber bleaching method, which is advantageous in high efficiency, heavy metal-free and low damage. However, the degradation mechanism of eumelanin of APS/H 2 O 2 bleaching method remains to be explored. Herein, standard eumelanin (SM) which has higher purity of eumelanin was used as reaction model, and SM was proved to degrade into five soluble oligomers by chemical structure analysis. Therefore, a new degradation pathway of eumelanin in APS/H 2 O 2 solution was simulated and proposed by in vitro experiment. In addition, the yak wool fiber was low damage by testing the fiber structure before and after bleaching. The dyeing property of yak wool fabrics had no effect on APS/H 2 O 2 bleaching. This investigation of degradation products provides new insights into the bleaching mechanism of APS/H 2 O 2 environmentally dark animal fiber bleaching method.
研究领域:
化学
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环境科学
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纺织科学
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DOI
高影响因子
CATALYSIS COMMUNICATIONS
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2016
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IF 3.389
Xiaomin Xiang,Bin Zhang,Guoqiang Ding,Jinglei Cui,Hongyan Zheng,Yulei Zhu
The oxidation of furfural in H 2 O 2 and H 2 O 2 –Mg(OH) 2 system were systematically investigated and a rational explanation for the reaction mechanism was proposed. 2-formyloxyfuran, from selective oxidation of HC O group in furfural, was a crucial intermediate. The addition of Mg(OH) 2 suppressed the oxidation of furan ring of furfural and enhanced selectivities of 2(5H)-furanone (44.8%) and succinic acid (38.0%). FT-IR, Gaussian calculation and experimental results indicated that the process of furfural oxidation with H 2 O 2 is homogeneous, and the synergy between dissolved Mg 2 + cations and OH − ions facilitates the HOO − attacking the carbon atom of HC O other than the C C bound of furan ring.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
Sustainability
·
2021
·Vol. 13
·期 5
·2641
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IF 3.251
Siyao Bian,Shuang Xu,Zhibing Yin,Sen Liu,Jihui Li,Shuying Xu,Yucang Zhang
In this study, sequential KMnO4-promoted oxidative pyrolysis and H2O2oxidation were employed to upgrade the adsorption capacities of durian shell biochar for methylene blue (MB) and tetracycline (TC) in an aqueous solution. It was found that the KMnO4/H2O2co-modification was greatly influenced by pyrolysis temperature and the optimal temperature was 300 °C. Moreover, a low concentration of H2O2enabled the improvement of the adsorption capabilities greatly with the catalysis of pre-impregnated manganese oxides, addressing the shortcoming of single H2O2modification. The co-modified biochar exhibited high adsorption capabilities for MB and TC, remarkably surpassed KMnO4- and H2O2- modified biochars as well as pristine biochar. The increase of adsorption capabilities could be mainly contributed to the incorporation of MnOxand carboxyl by KMnO4-promoted oxidative decomposition and Mn-catalyzed H2O2oxidation. This would provide a novel and efficient method for preparing highly adsorptive biochar using sequential KMnO4-promoted oxidative pyrolysis and H2O2oxidation.Keywords:biochar;KMnO4/H2O2co-modification;methylene blue;tetracycline
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Water Chemistry and Technology
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2022
·Vol. 44
·期 4
·297-303
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IF 0.484
Ma Q. G.,Hao Y.,Xue Y. F.,Niu Y. L.,Chang X. L.
Abstract Formaldehyde (HCHO) is a common chemical raw material and one of the major constituents in wastewaters from the production of chemical products. HCHO in wastewater is mainly removed by adsorption, biodegradation, and advanced oxidation. The objective of this study is to investigate transition metal oxides (Fe 2 O 3 , Co 2 O 3 , Ni 2 O 3 , CuO, ZnO) without pretreatment for enhancing the oxidation of HCHO. The oxidation of HCHO in wastewater by hydrogen peroxide using transition metal oxides as catalysts is studied. The concentration of HCHO in waste water was measured by indirect method. HCHO reacts with 2,4-dinitrophenylhydrazine in the presence of acetic acid to produce 2,4-dinitrophenylhydrazone. 2,4-Dinitrophenylhydrazone increases in proportion to the concentration of HCHO. The HCHO removal rate is determined by quantitative analyses of 2,4-dinitrophenylhydrazone using high-performance liquid chromatography (HPLC). The catalytic oxidation experiments are performed in test tubes at 25°C. The results indicate that the catalytic activity of the transition metal oxides towards HCHO oxidation is very different. The removal rate of HCHO was attributed to the number of hydroxyl radicals formed in the system. CuO shows higher catalytic activity in the oxidation of HCHO. The effect of the temperature, the mole ratios of hydrogen peroxide to HCHO, and the amount of CuO on the removal rate of HCHO were studied. Results of experiments show that the HCHO is almost wholly oxidized (>98%) at the best conditions (molar ratio of hydrogen peroxide to HCHO is 2.5, CuO is 0.06 g, 25°C for 15 min). CuO also offers the advantages of simple recovery from the treated solution and repeated use. It is hypothesized that CuO can transform hydrogen peroxide into active oxygen that has higher oxidation activity. But, the rate of formation and removal of free radicals HO· is very fast in the presence of transition metal oxides (Fe 2 O 3 , Co 2 O 3 , Ni 2 O 3 , ZnO).
研究领域:
环境科学
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化学工程
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DOI
高影响因子
EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
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2015
·Vol. 117
·期 8
·1185-1191
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IF 1.812
Weiwei Cheng,Guoqin Liu,Xuede Wang,Xinqi Liu,Lu Jing
In this work, the kinetics of “in situ” epoxidation of soybean oil with H 2 O 2 (30% w/w), catalyzed by phosphotungstic heteropoly acid [π-C 5 H 5 N(CH 2 ) 15 CH 3 ] 3 [PW 4 O 16 ] (PHA) phase transfer catalyst and polyethylene glycol (PEG) as interfacial agent in dichloroethane, were investigated at 40, 50, 60, and 70°C. Assuming that the epoxidation reaction occurred in the pseudo-homogeneous catalytic system and the side reaction of epoxy ring cleavage was negligible, the results appeared that the epoxidation reaction of soybean oil in the presence of PEG was a second-order with respect to double bond concentration and a first-order to the H 2 O 2 concentration. The corresponding apparent activation energy (42.12 kJ/mol) was lower than that of PHA alone (49.23 kJ/mol), indicating that PEG could decrease the activation energy and speed up the epoxidation reaction of soybean oil. Practical applications: An environmentally friendly catalyst is eagerly needed to produce peroxided soybean oil for low yield and to prevent polluting the environment through the epoxidation of soybean oil with peracid. Phosphotungstic heteropoly acid phase transfer catalyst and polyethylene glycol improve the conversion and selectivity of the epoxidation reaction of soybean oil, and enhance its production efficiency. The activation energy of the soybean oil epoxidation reaction with H 2 O 2 catalyzed by phosphotungstic heteropoly acid (PHA) in the presence of polyethylene glycol (PEG) was lower than that of PEG alone, accounting for the results showing that the epoxy group band of the former (PHA + PEG) appeared quicker than the latter (PHA) in IR spectra.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2018
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IF 1.712
Yaling Luo,Changjun Liu,Hairong Yue,Siyang Tang,Yingming Zhu,Bin Liang
The selective oxidation of cyclopentene by aqueous H 2 O 2 using H 3 PW 12 O 40 and tetrabutyl ammonium bromide (TBAB) as a phase transfer catalyst has been investigated. The results show that the presence of TBAB significantly improved the oxidation selectivity of cyclopentene. The effects of the reaction conditions on the conversion of cyclopentene were investigated in detail. The optimal reaction conditions are as follows: the H 3 PW 12 O 40 to TBAB molar ratio, 1:1–1:3; H 3 PW 12 O 40 to cyclopentene molar ratio, 0.54:100–0.64:100; and molar ratio of H 2 O 2 to cyclopentene, 1.6:1. The conversion reached to 59.8% in 4 h at 35.0 °C, while the selectivity of glutaraldehyde was 38.0% and the selectivity of 1,2-cyclopentanediol was 55.6%. In addition, a route for oxidation of cyclopentene by aqueous H 2 O 2 using a heteropoly acid and quaternary ammonium salt as a phase transfer catalyst was proposed.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Ruizhe Li,Xuhai Zhu,Fuyan Peng,Fang Lu
The effective use of agricultural lignocellulose resources in biodegradable bioplastics has become the focus of people’s attention due to the inappropriate disposal of agricultural waste and plastic materials. However, the repulsive smell and uncontrollable color of agricultural lignocellulose-based materials limit their potential to replace common consumer plastics. In this study, when the corn stover (CS) meal enforced the PLA/PBAT matrix using the melt blending method, the lignin and hemicellulose components were shown to substantially impact the color darkening and unsavory odor release for the resultant bioplastic; therefore, an optimized scalable alkaline hydrogen peroxide oxidation that can be performed using traditional pulp and paper production lines was used to modify CS on a large scale (LCS) to enhance the properties of bioplastics fabricated with the PLA/PBAT matrix. As a result, the appearance color and odor character of the bioplastic enforced by LCS have been significantly improved compared to those of natural CS. In addition, the bioplastic (LCS/PLA/PBAT) exhibited good tensile strength (9.7 MPa), flexural strength (18.1 MPa), elongation at break (61.8%), and surface hydrophobicity with a contact angle value of 91.6°, which could meet the requirement of the Chinese National Standard for Packaging. The reinforcing effect of LCS on these performances lay in its rigid structure with a strong fiber network, high content of cellulose crystalline, and hydrophobic nature of lignin after treatment, as proven by FTIR, XRD, and SEM results. Therefore, our bioplastics filled with treated agricultural waste are attractive appearance-wise, economically competitive, and biodegradable, making them a sustainable alternative to common consumer plastics.
研究领域:
材料科学
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环境科学
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农业科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）