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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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 2
·1479
·
IF 5.6
Shuxian Weng,Guixin Zhang,Yun Hu,Caiying Bo,Fei Song,Guodong Feng,Lihong Hu,Yonghong Zhou,Puyou Jia
Lignin degradation is an effective means of achieving the high-value application of lignin, but degradation usually requires the use of high temperatures and harsh reaction-conditions. This study describes a green, mild approach for the degradation of lignin, in which chlorine dioxide (ClO2) was used for the oxidative degradation of lignin (IL) in an acidic aqueous suspension at room temperature. The optimal process conditions were: 30 mL of ClO2solution (2.5 mg·L−1), pH 4.5 and 3 h. The FT-IR, NMR (1H NMR, 2D-HSQC and31P NMR), XPS and GPC analyses indicated that lignin could be degraded by ClO2relatively well at room temperature, to form quinones and muconic acids. Additionally, DIL was reduced to substances with a high phenolic-hydroxyl (OH) content (RDIL) under the presence of NaBH4, which further confirmed the composition of DIL and which can be applied to the development of lignin-based phenolic resins, providing a reference for the further modification as well as the utilization of DIL.Keywords:chlorine dioxide;lignin;room temperature;degradation
研究领域:
化学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 21
·13310
·
IF 6.208
Yi Liu,Baojuan Deng,Jiarui Liang,Jiao Li,Baojie Liu,Fei Wang,Chengrong Qin,Shuangquan Yao
Chlorine dioxide is widely used for pulp bleaching because of its high delignification selectivity. However, efficient and clean chlorine dioxide bleaching is limited by the complexity of the lignin structure. Herein, the oxidation reactions of phenolic (vanillyl alcohol) and non-phenolic (veratryl alcohol) lignin model species were modulated using chlorine dioxide. The effects of chlorine dioxide concentration, reaction temperature, and reaction time on the consumption rate of the model species were also investigated. The optimal consumption rate for the phenolic species was obtained at a chlorine dioxide concentration of 30 mmol·L−1, a reaction temperature of 40 °C, and a reaction time of 10 min, resulting in the consumption of 96.3% of vanillyl alcohol. Its consumption remained essentially unchanged compared with that of traditional chlorine dioxide oxidation. However, the consumption rate of veratryl alcohol was significantly reduced from 78.0% to 17.3%. Additionally, the production of chlorobenzene via the chlorine dioxide oxidation of veratryl alcohol was inhibited. The structural changes in lignin before and after different treatments were analyzed. The overall structure of lignin remained stable during the optimization of the chlorine dioxide oxidation treatment. The signal intensities of several phenolic units were reduced. The effects of the selective oxidation of lignin by chlorine dioxide on the pulp properties were analyzed. Pulp viscosity significantly increased owing to the preferential oxidation of phenolic lignin by chlorine dioxide. The pollution load of bleached effluent was considerably reduced at similar pulp brightness levels. This study provides a new approach to chlorine dioxide bleaching. An efficient and clean bleaching process of the pulp was developed.Keywords:lignin;chlorine dioxide;oxidation;bleaching;pulp
研究领域:
化学工程
·
林产化学
·
环境科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Cong Li,Feng Luo,Haojie Duan,Feilong Dong,Xiaoyang Chen,Mingbao Feng,Zuoran Zhang,Leslie Cizmas,Virender K. Sharma
This paper presents the degradation of chloramphenicol (CAP) by chlorine and chlorine dioxide (ClO 2 ) in tap water in a pilot-scale water distribution system (WDS) containing loops of three different pipe materials (stainless steel, ductile iron , and polyethylene). Greater degradation of CAP was seen with chlorine than with chlorine dioxide. After 180 min in the ductile iron loop of the WDS, the percent degradation of CAP by 2.0 mg/L of chlorine or ClO 2 was 76% and 52%, respectively. The degradation of CAP by chlorine in the WDS was investigated under various conditions, including chlorine concentrations of 1.0–4.0 mg/L, and varying pipe materials, flow velocity, and temperature. Degradation of CAP under different conditions could be fitted by first-order kinetics, and the determined first-order rate constants ( k , min −1 ) increased with an increase in chlorine concentration, flow velocity, and temperature. The degradation of CAP in different pipes followed the order stainless steel loop > ductile iron loop > polyethylene loop. Identified oxidized products of the chlorination of CAP were in agreement with proposed reaction pathways, which were also theoretically confirmed by quantum chemical calculations. Formation of three disinfection byproducts (chloroform, bromodichloromethane, and dibromochloromethane) was observed, with increases of 7.7, 0.76, and 0.39 µg/L, respectively, after 160 min.
研究领域:
环境科学
·
公共卫生
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Guilin He,Tuqiao Zhang,Feifei Zheng,Cong Li,Qingzhou Zhang,Feilong Dong,Yuan Huang
Fleroxacin (FLE) is an emerging third-generation fluoroquinolone antibacterial agent (FQs) that has been frequently detected in aqueous environments. However, there is a lack of sufficient knowledge regarding the transformation mechanisms of FLE within drinking water distribution systems (DWDSs) when residual chlorine and ClO 2 are present. To address this gap, this study makes the first attempt to explore the kinetics, transformation byproducts and toxicity variations during fleroxacin (FLE, an emergent pollutant) degradation by chlorine and ClO 2 in a pilot-scale DWDSs. The obtained results show that (i) the FLE degradation rate by chlorine was higher than by ClO 2 at pH 7.4 in the pilot-scale DWDSs; (ii) the degradation efficiency of FLE was significantly affected by pH, with FLE degradation by chlorine possessing the highest rate at neutral pH, and the degradation rate was positively correlated with pH (from 6.5 to 9) during the ClO 2 disinfection process; (iii) pipe materials can appreciably affect the relative performance of the FLE degradation efficiency by chlorine and ClO 2 ; (iv) seven and eight intermediates are identified during chlorination and ClO 2 oxidation, respectively, and the cleavage of the piperazine group was the committed step and the main oxidation reaction, and (v) the toxicity assessment demonstrates that the toxicity of FLE chlorination and ClO 2 are both higher than the blank experiment, and ClO 2 disinfection can reduce the potential risk compared to the chlorine disinfection.
研究领域:
环境科学
·
公共卫生
·
毒理学
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产品关联
DOI
高影响因子
Coatings
·
2020
·Vol. 10
·期 3
·242
·
IF 2.436
Yuanyuan Li,Dan Ren,Dan Xu
Chlorine dioxide (ClO2) has received great attention as a nontoxic and efficient antimicrobial agent for the preservation of fresh fruits and vegetables. A novel two-layer coated corrugated box was developed to release gaseous ClO2under the trigger of moisture in this study. The inner surface of the box was firstly coated with a mixture of polyvinyl alcohol-NaClO2-diatomite and then with chitosan acetic acid solution. Results showed that ClO2was successfully released under high humidity due to the reaction of NaClO2, water vapor and acid. The concentration of released ClO2increased with the increasing NaClO2content in the coating, while the addition of diatomite stabilized and extended the release. To evaluate the preservation effect, strawberries were packed in the coated box and stored at room temperature. Compared with the control, the decay rate and weight loss of the strawberries packed in the coated box (9 g/L NaClO2) were reduced up to 21.88% and 6.84%, respectively. The surface color, firmness and nutrients content were also better maintained. Therefore, this coated corrugated box with the capability to release ClO2under the trigger of moisture has great potential to be applied as an antimicrobial packaging for fresh fruits and vegetables.Keywords:chlorine dioxide;controlled-release;antimicrobial packaging;coating;corrugated box
研究领域:
食品科学
·
材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yuantong Cao,Yuhe Dong,Tong Wu,Linyan Chen,Wanying Zhu,Tao Jiang,Nan He,Yao Liu,Ran Huang,Xi Yu,Ying Xiao,Tian Zhong
Fruit spoilage caused by microorganisms results in huge economic losses and health risks worldwide every year. To develop an intelligent antimicrobial material capable of responding to the physiological activity of postharvest fruits and releasing antibacterial agents on demand, we fabricated a pH-responsive film for the release of chlorine dioxide (ClO 2 ) using carboxymethyl cellulose (CMC) and sodium chlorite (NaClO 2 ) via the solution casting method, with a CMC:NaClO 2 ratio of 1:2 w /w. An acid environment simulated by 4 % acetic acid activated 43 % of ClO 2 released by the film within 7 days. A 1 × 2 cm 2 film in acid environment effectively inhibited the growth of Staphylococcus aureus (10 6 CFU/mL), Escherichia coli (10 5 CFU/mL), and Aspergillus niger on agar media (with colony diameters reduced from 60.00 mm to 19.07 mm). A 3 × 3 cm 2 film reduced the decay incidence caused by A. niger in strawberry from 100 % (control) to only 20 % on day 6. Compared with the control group, no significant differences in color, total soluble solids (TSSs) or triable acidity (TA) were observed in the film-treated groups. The development of pH-responsive NaClO 2 -CMC films offers a practical and effective solution for extending the shelf-life and maintaining the quality of fruit.
研究领域:
食品科学
·
材料科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Guilin He,Tuqiao Zhang,Yunfei Li,Jinzhe Li,Feiyong Chen,Jun Hu,Feilong Dong
Fleroxacin (FLE) is a widely used fluoroquinolones to cure urinary tract infections and respiratory disease, which has been frequently detected in the aquatic environment. The reactivity kinetics of FLE by chlorine and chlorine dioxide (ClO 2 ) and transformation mechanism were investigated in this study. The results showed that FLE was degraded efficiently by chlorine and ClO 2 , and both reactions followed second-order kinetics overall. The increase of disinfectant dosage and temperature would enhance the degradation of FLE. The highest removal of FLE by chlorine was achieved at a neutral condition (pH 7.4), whereas ClO 2 reaction rates increased dramatically with the increasing pH in this study condition. The number of intermediates identified in FLE chlorination and ClO 2 oxidation was seven and ten, respectively. The piperazine ring cleavage was the principal and initial reaction in both above reactions. Then, the removal of the piperazine group was predominantly in FLE removal by chlorine, while the decarboxylation mainly occurred in FLE removal by ClO 2 . The intermediates increased first and then decreased with time, while three kinds of halogenated DBPs increased with time, indicating the above-identified intermediates were further transformed to the halogenated DBPs. Additionally, compared to chlorine reaction, the reaction of ClO 2 with FLE reduced the formation of halogenated DBPs, but it also induced the formation of chlorite. The analysis of toxicity showed that compared with chlorination, the oxidation of ClO 2 was more suitable for FLE removal.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2019
·
IF 3.315
Zaizheng Dong,Yimin Zhu,Yuexin Han,Peng Gao,Xiaotian Gu,Yongsheng Sun
Arsenopyrite is a typical arsenic-containing mineral, and gold is generally hosted by arsenopyrite mineral which adversely affects gold leaching. In this study, a novel environmentally friendly oxidant, chlorine dioxide (ClO 2 ), was used for the first time to efficiently oxidize arsenopyrite under acidic conditions, preventing the adverse effect of arsenopyrite on gold leaching. The addition of solid NaClO 2 to acidic arsenopyrite slurry made the oxidation of arsenopyrite feasible for practical purposes, as NaClO 2 generates ClO 2 under acidic conditions, which then oxidizes arsenopyrite. For a 400 mL sample of arsenopyrite pulp with the initial concentration of 4.07 g/L (0.025 M), the oxidation efficiencies of Fe and As in arsenopyrite reached 94.25% and 85.39%, respectively for NaClO 2 and H 2 SO 4 concentrations of 0.125 M each, under magnetic stirring for 1 h at 30 °C in a constant-temperature water bath. At the end of the reaction, both the acidity and oxidation-reduction potential of the system increased, and the ClO 2 concentration correspondingly decreased. Chemical composition analysis, X-ray diffraction analysis, particle size distribution measurements, scanning electron microscopy combined with energy dispersive spectrometer analysis, and X-ray photoelectron spectroscopy of arsenopyrite mineral ore and its oxidized residues were performed under different reaction conditions. Analysis results indicated that tiny amorphous precipitates of the oxidation by-products, such as FeAsO 4 ·7H 2 O, H 3 AsO 3 , Fe 2 (SO 4 ) 3 ·7H 2 O, and hydrated ferric oxides would cover the surface of unreacted arsenopyrite at low H 2 SO 4 concentration, which prevented the oxidation-reduction reaction from proceeding. As the concentrations of H 2 SO 4 and NaClO 2 increased, fine arsenopyrite particles were oxidized first, and ClO 2 gradually eroded the surface of the unreacted arsenopyrite minerals to form cracks, defects, and pores, until arsenopyrite was fully oxidized. ClO 2 presents several advantages: it can be easily prepared, it is a strong oxidant, and is non-polluting. Therefore, the procedure in this study is expected to be used as a novel method for preventing the effect of arsenopyrite enwrapping gold in refractory gold ores and for directly leaching gold.
研究领域:
化学工程
·
环境科学
·
冶金学
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产品关联
DOI
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
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Guilin He,Tuqiao Zhang,Qingzhou Zhang,Feilong Dong,Yonglei Wang
Enoxacin (ENO) is widespread in water because it is commonly used as a human and veterinary antibiotic. However, little effort has been dedicated to revealing the transformation mechanisms of ENO destruction using ClO 2 , especially within a water distribution system (WDS). To address this knowledge gap, the kinetics, byproducts, toxicity, and formation potential of halogenated disinfection byproducts (DBPs) associated with ENO destruction using ClO 2 in a pilot-scale PE pipe was explored for the first time. Statistical analyses showed that the destruction efficiency of ENO in the pilot-scale PE pipe was lower than that in deionized water (DI water), and the reactions in DI water followed the second-order kinetic model. Furthermore, pH has a significant effect on the destruction of ENO, and the removal ratio increased at a higher pH. Additionally, increasing the flow rate elevated the ENO removal efficiency; however, the influence of flow velocity was limited to ENO destruction. The ENO removal rates within the diverse pipes exhibited the following order: stainless steel pipe < PE pipe < ductile iron pipe. Nine possible intermediates were identified, and those that were formed by piperazine group cleavage represented the major primary byproducts of the entire destruction process. Additionally, the ENO destruction in a pilot-scale PE pipe had minimal influence on halogenated DBPs and chlorite formation. Finally, the toxicity evaluation illustrated that the presence of ENO increased the potential risk of water quality safety when treated with ClO 2 .
研究领域:
环境科学
·
公共卫生
·
化学工程
✓ 已验证
DOI
高影响因子
Frontiers in Nutrition
·
2023
·
IF 5
Su Hongxia,Chen Zhanpeng,Zhao Yuan,An Jiejie,Huang Haohe,Liu Ren,Huang Chongxing
Introduction: Chlorine dioxide (ClO2) is a safe and efficient bactericide with unique advantages in reducing foodborne illnesses, inhibiting microbial growth, and maintaining the nutritional quality of food. However, gaseous ClO2 is sensitive to heat, vibration, and light, which limits its application.Methods: In this study, a ClO2 precursor-stabilized ClO2 aqueous solution was encapsulated by the double emulsion method, and a high-performance ClO2 self-releasing polyvinyl alcohol (PVA) film was prepared to investigate its performance and effect on blueberry quality during storage.Results: The self-releasing films had the best overall performance when the microcapsule content was 10% as the film's mechanical properties, thermal stability, and film barrier properties were significantly improved. The inhibition rates of Listeria monocytogenes and Escherichia coli were 93.69% and 95.55%, respectively, and the mycelial growth of Staphylococcus griseus was successfully inhibited. The resulting ClO2 self-releasing films were used for blueberry preservation, and an experimental study found that the ClO2 self-releasing antimicrobial film group delayed the quality decline of blueberries. During the 14-day storage period, no mold contamination was observed in the ClO2 self-releasing film group, and blueberries in the antibacterial film group had higher anthocyanin accumulation during the storage period.Discussion: Research analysis showed that films containing ClO2 microcapsules are promising materials for future fruit and vegetable packaging.
研究领域:
食品科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）