CELLULOSE
·
2025
·
IF 4.8
Zhao Yao,Wang Xueping,Li Bowen,Si Tian,Gao Xin,Peng Lincai,Zhang Heng
The cellulose catalytic oxidation system mainly comprises inorganic ion-based oxidants. Hence, the selective oxidation of C 6- primary hydroxy groups (C 6 -OH) of cellulose, catalyzed by piperidine free radicals, was limited to the homogeneous cellulosic system containing protic solvents or heterogeneous system. In this work, the use of the catalytic system containing 4-acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (4-AcNH-TEMPO) was extended to the cellulosic solution in N, N-dimethylacetamide (DMAc) and combined with chlorine dioxide. Results showed that the carboxyl content was 0.832 mmol/g. Meanwhile, the degree of polymerization decreased from 900 to 489. This study provides an effective route for the homogeneous selective oxidation of primary hydroxy groups in cellulose and explored its oxidation mechanism in DMAc solvent. Furthermore, studies showed that the reactive chlorine species- ClO·, Cl·, and ClO 2 played a crucial role in the oxidation process. The methodology developed here displayed great potential to be utilized to various biomolecules in aprotic solvents homogeneous system based on 4-AcNH-TEMPO as oxidation catalysts.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 18
·12704-12717
·
IF 2.993
Huang Chongxing,Zhang Baodong,Wang Shuangfei,Zhang Linyun,Wang Jian,Huang Xingqiang,Zhao Yuan,Huang Lijie
In this study, a novel chlorine dioxide (ClO 2 ) microcapsule with a performance of moisture-triggered release was fabricated followed by the mixing with polylactic acid (PLA) for the preparation of an antibacterial packaging film. ClO 2 microcapsules were first prepared by encapsulating stable ClO 2 solution (NaClO 2 as the main component) in a PLA shell, and the resulting microcapsules together with tartaric acid were applied as antibacterial components for antimicrobial PLA film using solvent casting method. The impact of ClO 2 microcapsules on the antimicrobial effectiveness, oxygen and water vapor barrier properties, mechanical behavior, and thermal stability of PLA films was investigated. The results showed that the addition of ClO 2 microcapsules at a concentration of 20% imparted PLA films excellent antimicrobial properties with a growth inhibition of Escherichia coli and Staphylococcus aureus by 4.95 log CFU/mL and the antibacterial rate was 99%. Furthermore, the tensile strength of the films with ClO 2 microcapsules at a concentration of 20% was 21.20 MPa, which was 19% higher than that of the PLA film without microcapsules. The oxygen and water vapor transmission rates reached 2800 cm 3 m −2 24 h −1 and 20.00 g m −2 24 h −1 , respectively, and the barrier properties were improved by 20 and 36.14%. Thermogravimetric analysis showed that the generated film was stable before 193 °C. Scanning electron microscopy analysis confirmed a good compatibility between the ClO 2 microcapsules and the PLA matrix, and the emerged voids indicated the generation of ClO 2 and its release from the antimicrobial film. An obvious sustained release of ClO 2 from the antimicrobial film completed until 240 h. The release behavior fitted the logistic model, and the release mechanism followed the S model. This study may provide a feasible approach for the development of food packaging materials with efficient antibacterial activity and sustained-release performance.
研究领域:
食品科学
·
材料科学
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DOI
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Xuecong Qian,Shilong Wang,Haijun Cheng,Ziye Jia,Da Wang,Yandong Xie,Jinhao Duan,Yu Tian,Jun Ma
The oxidation kinetics of Mn(II) by free chlorine is relatively low under near-neutral pH conditions which limits the Mn removal efficiency in drinking water treatment. Therefore, this study investigated the oxidation efficiency of Mn(II) by the UV-enhanced chlorination (UV/chlorine) system and identified the responsible reactive radical species. The results show that the oxidation kinetic of Mn(II) was greatly enhanced by the UV/chlorine system under near-neutral pH or even acidic conditions. The pseudo-first-order reaction rate of Mn(II) at pH 8.0 (within the first 20 min) increased from 2.60 × 10 −5 s −1 to 3.41 × 10 −4 s −1 . Based on the scavenging experiments and the steady-state kinetic modeling, ClO · and ClO 2 , whose steady-state concentration (∼10 −10 M and ∼10 −9 M, respectively at pH 8.0) was at least 4 orders of magnitude higher than that of HO · and Cl · , were recognized as the dominant reactive species contributing to the oxidation of Mn(II). Kinetic model calculations indicate that the contribution of ClO · to the oxidation of Mn(II) was consistently maintained above 70 %, and ClO 2 also played an important role in the oxidation of Mn(II) especially under acidic and alkaline conditions. In addition, the background components of HCO 3 − and Cl − had negligible influence on the oxidation efficiency because they barely changed the concentration of the ClO · and ClO 2 . This study first demonstrates the important role of ClO 2 in the oxidation of Mn(II) in the UV/chlorine system, and the possible role of ClO 2 in the degradation of some organic pollutants needs to be carefully evaluated in the future.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Mengge Fan,Xin Yang,Qingqing Kong,Yu Lei,Xinran Zhang,Ehsan Aghdam,Ran Yin,Chii Shang
This study systematically revealed the feasibility of the sequential ClO 2 -UV/chlorine process for micropollutant removal and disinfection byproduct (DBP) control. The results demonstrated that the sequential ClO 2 -UV/chlorine process was effective for the removal of 12 micropollutants. ClO 2 pre-treatment reduced the formation of disinfect byproducts (DBPs) in the UV/chlorine process. Compared to the UV/chlorine process, ClO 2 pre-treatment (1.0 mg L −1 ) decreased the formation of the 6 DBPs by 25.1–72.2%; and decreased the formation potential of the 6 DBPs by 13.9–51.8%. Moreover, ClO 2 pre-treatment reduced the concentration of total organic chlorine by 19.8%. ClO 2 pre-treatment affected the UV/chlorine process in different ways. Firstly, ClO 2 pre-treatment generated chlorite, which dominantly served as a scavenger of chlorine radical (Cl ) and hydroxyl radical (HO ). Secondly, ClO 2 pre-treatment decreased the reactivity of natural organic matter (NOM) towards radicals. Finally, ClO 2 pre-treatment altered the properties of NOM, in terms of reducing the electron-donating capacity and aromaticity of NOM (SUVA 254 ), and slightly reducing the average molecular weight of NOM. Overall, ClO 2 pre-treatment effectively controlled the formation of DBPs in the UV/chlorine process. This study confirmed the sequential ClO 2 -UV/chlorine process was an alternative strategy to balancing the micropollutant removal and DBP control.
研究领域:
环境科学
·
水处理
·
化学工程
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DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Zhuoyue Wang,Ji Li,Wei Song,Jingxin Yang,Wenyi Dong,Xiaolei Zhang
Recently, it has been reported that chlorine dioxide (ClO 2 ) and (bi)sulfite/ClO 2 showed excellent performance in micropollutant removal from water; however, the degradation mechanisms and application boundaries of the two system have not been identified. In this study, bisphenol A (BPA) was chosen as the target contaminant to give multiple comparisons of ClO 2 and S(IV)/ClO 2 process regarding the degradation performance of contaminant, generation of reactive species, transformation of products and toxicity variation. Both ClO 2 and S(IV)/ClO 2 can degrade BPA within 3 min. The BPA degradation mechanism was mainly based on direct oxidation in ClO 2 process while it was attributed to radicals (especially SO 4 · - ) generation in S(IV)/ClO 2 process. Meanwhile, the effect of pH and coexisting substances (Cl − , Br − , HCO 3 − and HA) were evaluated. It was found that ClO 2 preferred the neutral and alkaline condition and S(IV)/ClO 2 preferred the acidic condition for BPA degradation. An unexpected speed-up of BPA degradation was observed in ClO 2 process in the presence of Br − , HCO 3 − and HA . In addition, the intermediate products in BPA degradation were identified. Three exclusive products were found in ClO 2 process, in which p-benzoquinone was considered to be the reason of the acute toxicity increase in ClO 2 process.
研究领域:
环境科学
·
化学工程
·
毒理学
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PubMed
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2019
·Vol. 35
·期 1
·18-24
·
IF 0.929
Hailong Li,Chao Du,Shujuan Ge,Mengru Liu
This study aimed to investigate the oxalate formation mechanism during chlorine dioxide (
ClO
2
) bleaching of bamboo kraft pulp, and thus explore favourable
ClO
2
bleaching conditions to better control oxalate formation. The amount of oxalate formed varied linearly with
ClO
2
dosage within the whole research range, while it rose exponentially within the first 90 mins of pulp bleaching. Then the actual bleaching process was simulated by reacting
ClO
2
with three representative lignin model compounds and comparatively studied. The rule of oxalate formation in the simulated reaction system was identical to that in pulp bleaching by
ClO
2
, except for oxalate production by veratraldehyde with prolonged reaction time. Under identical conditions, vanillin formed the highest amount of oxalate, while veratraldehyde formed the least. Furthermore, the amount of oxalate formed increased by 19.59 mg/kg when the kappa number of the delignified pulp was reduced by one unit. Considering the satisfactory pulp brightness and decreased oxalate formation, the recommended conditions for
ClO
2
bleaching of bamboo kraft pulp were a
ClO
2
dosage of 4 %, 60 °C and 70 mins.
研究领域:
制浆造纸工程
·
化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Chenyan Hu,Yihui Wu,Zhengyu Dong,Ziyi Dong,Shengjie Ji,Lili Hu,Xinyu Yang,Hao Liu
A mixed oxidant of chlorine dioxide (ClO 2 ) and NaClO was often used in water treatment. A novel UVA-LED (365 nm)-activated mixed ClO 2 /NaClO process was proposed for the degradation of micropollutants in this study. Carbamazepine (CBZ) was selected as the target pollutant. Compared with the UVA 365 /ClO 2 process, the UVA 365 /ClO 2 /NaClO process can improve the degradation of CBZ, with the rate constant increasing from 2.11×10 −4 sec −1 to 2.74×10 −4 sec −1 . In addition, the consumption of oxidants in the UVA 365 /ClO 2 /NaClO process (73.67%) can also be lower than that of UVA 365 /NaClO (86.42%). When the NaClO ratio increased, both the degradation efficiency of CBZ and the consumption of oxidants can increase in the UVA 365 /ClO 2 /NaClO process. The solution pH can affect the contribution of NaClO in the total oxidant ratio. When the pH range of 6.0-8.0, the combination process can generate more active species to promote the degradation of CBZ. The change of active species with oxidant molar ratio was investigated in the UVA 365 /ClO 2 /NaClO process. When ClO 2 acted as the main oxidant, HO• and Cl• were the main active species, while when NaClO was the main oxidant, ClO• played a role in the system. Both chloride ion (Cl – ), bicarbonate ion (HCO 3 – ), and nitrate ion (NO 3 – ) can promote the reaction system. As the concentration of NaClO in the reaction solution increased, the generation of chlorates will decrease. The UVA 365 /ClO 2 /NaClO process can effectively control the formation of volatile disinfection by-products (DBPs), and with the increase of ClO 2 dosage, the formation of DBPs can also decrease.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
Applied Food Research
·
2026
·
IF 5.4
Lisheng Tang,Xiaoyan He,Ran Huang
Postharvest losses of fresh produce are driven by mechanical damage and microbial decay, yet existing preservation technologies typically address only one of these challenges. To bridge this gap, a biodegradable, ultraviolet (UV)-crosslinked copolyester that integrates impact cushioning with controlled chlorine dioxide (ClO 2 ) release via sodium-chlorite-loaded montmorillonite (NaClO 2 @MMT) is engineered. The novelty of this work lies in the synergistic combination of a cushioning elastomeric matrix with a functionalized nanofiller, enabling a single-material strategy for simultaneous mechanical protection and controlled ClO 2 delivery associated with delayed visible spoilage. The optimized matrix (PISBEN19, 10 mol% itaconic acid) combines high elasticity (elongation 208.01%, toughness 708.77 kJ m -3 ). The incorporation of 15 parts NaClO 2 @MMT (PISBEN19-15) significantly enhanced the tensile strength to 3.97 MPa, representing an increase of approximately 459%, while enabling sustained ClO 2 release over approximately 15 days under high-humidity conditions. In cherry-tomato trials at 25°C, PISBEN19-15 suppresses respiration and ethylene, limits weight loss (0.76% at day 15; 74.4% reduction vs. control), preserves firmness and total soluble solids, and extends shelf life by ≥6 d without decay. The mechanistic tests suggest that NaClO2@MMT contributes to both mechanical reinforcement and sustained release, while a preliminary drop test provides initial evidence of impact attenuation. This dual-function eco-friendly elastomer offers a single-material strategy to simultaneously address impact and infection, with significant potential for reducing postharvest losses, particularly in regions lacking advanced cold-chain infrastructure.
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DOI
高影响因子
FOOD CHEMISTRY
·
2026
·
IF 10.4
Runyu He,Fang Chen,Chunxuan Gao,Meng Li,Kaibin Gu,Zhiqun Zou,Jiahao Wu,Chunyi Luo,Xingbo Shi
To address the accelerated spoilage of food caused by temperature fluctuations during cold chain transportation, an intelligent preservation sachet (MCs-Sachet) with temperature-responsive activation was developed. The MCs-Sachet incorporates a polyethylene glycol–citric acid (PEG-CA) matrix and sodium chlorite (NaClO 2 ) microcapsules. Upon exposure to elevated temperature, the composite undergoes a phase transition, releasing acid that triggers the controlled generation of chlorine dioxide (ClO 2 ). The MCs-sachet exhibited broad-spectrum antimicrobial activity, achieving complete inactivation of Escherichia coli , Staphylococcus aureus , and Botrytis cinerea to below the detection limit at a microcapsule loading of 0.75 g. Additionally, it suppressed respiration and reduced ethylene accumulation in blueberries by 88.13%, thereby extending shelf life by approximately 2-fold at 25 °C. In shrimp stored at 4 °C, freshness was prolonged by 48 h. These multifunctional effects demonstrate that the MCs-Sachet servers as an adaptive platform for enhancing food preservation within dynamic cold chains environments.
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PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 227
·期 9
·1-13
·
IF 1.551
Ma Yulin,Gu Na,Gao Jinlong,Wang Kuitao,Wu Yunxia,Meng Xiaoyu
Fe 3 O 4 -CuO@montmorillonite was prepared using coprecipitation method, and its structure was determined by XRD, IR, and transmission electron micrograph (TEM). Montmorillonite in Fe 3 O 4 -CuO@montmorillonite nanocomposite allowed the silicate layer of montmorillonite to behave as a barrier, which prevented the agglomeration and natural crystallization of Fe 3 O 4 and CuO. Furthermore, the chlorine dioxide (ClO 2 ) oxidative degradation of anthracene-contaminated soil was studied in detail using Fe 3 O 4 -CuO@montmorillonite as a magnetic heterogeneous catalyst. The operating parameters such as ClO 2 concentration, catalyst dosage, reaction time, and pH were evaluated. Compared with the conventional ClO 2 oxidation process without the catalyst, the ClO 2 catalytic oxidation system could significantly enhance the degradation efficiency. Under the optimal condition (anthracene concentration 89.8 mg/kg, water soil mass ratio 3:1, initial pH 7, ClO 2 concentration 1 mol/kg, catalyst dosage 1 g/kg, reaction time 30 min, and reaction temperature 25 °C), anthracene degradation efficiency achieved 96.2 %. The catalyst could be easily reused by magnetic separation and used at least 8 cycles without obvious loss of activity. The kinetic studies revealed that the ClO 2 catalytic oxidation degradation of anthracene-contaminated soil with Fe 3 O 4 -CuO@montmorillonite as catalyst followed pseudo-first-order kinetics with respect to ClO 2 concentration. Thus, this study showed potential application of ClO 2 catalytic oxidation process in remediation of organic pollutant-contaminated soil.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2019
·
IF 1.536
Xiaofeng Wang,Beihai Zhou,Xia Shao
Dimethylamine-based pharmaceutical personal care products (DMA-based PPCPs) are a group of N-nitrosodimethylamine (NDMA) precursors. The acid dissociation constant (pKa) values of four DMA-based PPCPs were determined by potentiometric titration over the pH range of 3–11. The pKa values of ranitidine, nizatidine, doxylamine and carbinoxamine corresponding to the DMA moiety were 8.4, 6.8, 9.4 and 9.1, respectively. Competition reaction kinetics and pseudo-first-order reaction kinetics were used to determine the reaction rate constant (k) of the DMA-based PPCPs with O3, NaClO, ClO2 and KMnO4. Comparing the degradation rate constants of the four DMA-based PPCPs, the results of ClO2 oxidation were close, and for the other three oxidants, the order was kranitidine ≈ knizatidine > kdoxylamine ≈ kcarbinoxamine. Comparing the reaction rate of the four oxidants, for ranitidine and nizatidine, the order was kNaClO > kO3 > kKMnO4 > kClO2, and for doxylamine and carbinoxamine, the order was kO3 > kNaClO > kClO2 > kKMnO4.
研究领域:
环境科学
·
化学动力学
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DOI
高影响因子
Journal of Cleaner Production
·
2026
·
IF 10.7
Pengkang Zhang,Tao Zhao,Lijuan Ma,Shuang Tian,Meixue Zhang,Changbo Liu,Yaojie Wu,Xiurong Chen
In recent years, industrial emissions and waste treatment have increasingly contributed to organic odour pollution, necessitating efficient degradation technologies for typical odorous substances like dimethyl disulfide, trichloroethylene, and p-xylene. This study innovatively employs acid- and iron-modified bentonite (Fe-H-Bent) as a catalyst to enhance the oxidation performance of hydrogen peroxide (H 2 O 2 ) and chlorine dioxide (ClO 2 ) systems, addressing the limitations of low oxidant utilization in conventional methods. By comparing degradation efficiencies, the Fe-H-Bent + ClO 2 system demonstrated superior removal rates (99% for DMDS, 91% for TCE, and 87% for p-xylene under optimal conditions: catalyst-to-oxidant ratio of 1:2, 40 °C, pH = 3), attributed to its enhanced redox potential and catalytic active sites. Mechanistic investigations, combined with electron paramagnetic resonance (EPR) and Fukui function calculations, revealed a dual oxidation pathway: hydroxyl radical (·OH)-mediated attack on methyl-adjacent sites of p-xylene and ClO 2 -driven electron transfer reactions on para-methyl positions, forming intermediates like 2,5-dimethylphenol and alkyl radicals. This work highlights the synergy between modified bentonite and ClO 2 , offering a novel, efficient strategy for odorous substance removal in wastewater treatment, with theoretical insights into radical- and electron-transfer co-oxidation mechanisms.
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高影响因子
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