BIORESOURCE TECHNOLOGY
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2024
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IF 9.7
Haojie Yang,Xue Li,Shasha Liu,Guiying Lin,Xin Guo,Xin Wang,Kuan Ding,Yong Huang,Shu Zhang
Due to the complexity of biomass structures, the conversion of raw biomass into value-added chemicals is challenging and often requires efficient pretreatment of the biomass. In this paper, a simple and green pre-oxidation method, which was conducted under the conditions of 2 wt% H 2 O 2 , 80 min, and 150 °C, was reported to significantly increase the production of levoglucosan (LG) from biomass pyrolysis. The result showed that the LG yield significantly increased from 2.3 wt% (without pre-oxidation) to 23.1 wt% when pine wood was employed as a sample for pyrolysis at 400 °C, resulting from the removal of hemicellulose fraction and the in-situ acid catalysis of lignin carboxyl groups formed during the pre-oxidation. When the conditions for pre-oxidation became harsher than the above, the LG yield reduced because the decomposition of cellulose fraction in biomass. The study supplies an effective method for utilization of biomass as chemicals.
研究领域:
化学工程
·
生物质能
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Tianze Liu,Xiaobin Liao,Xinna Lin,Jing Yu,Huan Qi,Zhibin Jiang,Jing Zou,Qingsong Li
This study was to evaluate the feasibility of controlling carcinogenic nitrosodiethylamine (NDEA) formation from greenhouse gas adsorbent 3-diethylaminopropylamine (DEAPA) by pre-O 3 in subsequent chlorination/chloramination processes. The result indicated that the NDEA yields (0.4 %) during chlorination was 1.3 times of that during chloramination (0.3 %); pre-oxidation with 4 mg/L O 3 significantly cut down its formation; the reduction rates were up to 67.5 and 48.5 %, respectively. OH scavenger greatly augmented the final NDEA amount from 1.86 to 5.05 μg/L during ozonation , while its roles on subsequent processes differed with disinfection methods as well as O 3 (g) dosages. Most of co-existed substances inhibited NDEA generation, except NO 2 − , CO 3 2− and SO 4 2− , which slightly promoted during ozonation. Basing on Gaussian calculation, GC/MS and UPLC-Q-TOF-MS analysis, the influencing mechanisms of pre-O 3 on NDEA formation in subsequent disinfection processes were proposed. In addition, the calculated toxicity analysis as well as the whole toxicity was applied to evaluate the possibility of pre-O 3 on risk control.
研究领域:
环境科学
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水处理工程
·
毒理学
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DOI
PubMed
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Jian Xue,Da Wang,Xingjuan Li,Guangci Li,Zhong Wang,Yuanshuai Liu,Xuebing Li
A tandem strategy of “mild preoxidation-hydrogenolysis” was proposed for the efficient depolymerization of lignin. Firstly, a mild oxidation system was constructed with H 2 O 2 as the green oxidant and NaOH/Fe 2 (SO 4 ) 3 /CuO as the catalyst to pretreat lignin; then NiMoS catalyst was used for the further hydrogenolysis of the pretreated lignin. The reaction results showed that the strategy could achieve efficient lignin depolymerization. Under optimal conditions, the lignin liquefaction degree reached 91.1 wt.% and the monomer yield reached 20.6 wt.%. The structural analysis of the recovered lignin showed that the mild oxidation pretreatment could initially break the linkage bonds within the lignin molecule and get some large fragment molecules. Meanwhile, it also made the hydroxyl group in the C α position of the β-O-4 bond oxidized to carbonyl group, thus reducing the dissociation energy of the β-O-4 bond.
研究领域:
化学工程
·
生物质能
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Liang Chen,Zhenghao Wang,Xinyang He,Gang Zhi,Kailong Zhang,Liping Cao,Dongmei Luo,Bin Liang
The pursuit of efficient hydrogen production has driven the development of chemical looping hydrogen generation (CLHG), a promising technology that converts low–calorific–value reducing gases into high–purity hydrogen with minimal environmental impact. However, the limited activity and high cost of oxygen carriers (OCs) have hindered the broader adoption of CLHG. In this study, efficient and low–cost magnetite–based OCs were developed through pre-oxidation and transition metal modification. The results showed that pre–oxidation of magnetite at 900 °C for 2 h significantly increased oxygen vacancy concentration and porosity, boosting hydrogen yield from 0.64 mmol‧g −1 to 3.65 mmol‧g −1 . Further modification with nickel led to a twelvefold enhancement in hydrogen production, achieving 7.60 mmol‧g −1 at 650 °C. Notably, the purity of generated hydrogen exceeded 99.50 % without additional separation procedures. This study also identified sintering as a primary deactivation mechanism, which can be mitigated with an oxygen–assisted regeneration strategy. These findings offer valuable insights for developing efficient OCs and high–purity hydrogen generation from industrial off–gas.
研究领域:
能源材料科学
·
化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Min Li,Chenlong Zhang,Jie Dou,Chi Jiang,Yingli Wang,Qiyao Guo,Xinyu Zhang,Bin Dong,Qunwei Tang
Constructing ultra-high activity, highly efficient and robust oxygen evolution reaction (OER) electrocatalysts, especially at large current density, plays a key role in the development of the electrolytic water industry but remains challenging. Highly dispersed alloy compound with large electrolyte contact area and excellent internal conductivity is considered as a kind of ideal candidate. Here, we have rationally designed and synthesized a nickel-platinum alloy with octahedral structure loaded on the surface of the carbon layer (NiPt/C). Under the in-situ modulation of the iron-containing electrolyte, the Fe modified NiPt/C catalyst displays an amazing OER activity in 1 M KOH, and only requires low overpotentials of 183 and 242 mV to reach 100 and 1000 mA cm −2 , respectively. The comprehensive characterization analysis and property measurements reveal that the pre-oxidation of Pt at OER potential contribute to the rapid production of nickel hydroxide, thus promoting the deposition of more iron active sites on its surface. Moreover, the Pt/C/CP (−) //NiPt/C/CP (+) couple embedded in anion-exchange membrane water electrolyser also displays a low cell voltage of 2.03 V at 1000 mA cm −2 with significant electrochemical stability, which endows it a great potential in the field of hydrogen production and electrochemical energy storage.
研究领域:
材料科学
·
电化学
·
能源转换与存储
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Qiongfang Wang,Yisheng Shao,Naiyun Gao,Shushen Liu,Lei Dong,Pinghua Rao,Wenhai Chu,Bin Xu,Na An,Jing Deng
The occurrence of alachlor in natural drinking water sources raises concerns due to adverse health effects. Advanced oxidation with zero valent iron activating persulfate (ZVI/PS) can degrade alachlor with great potential. But no information was reported about effect of ZVI/PS preoxidation on the generation of disinfection byproducts (DBPs) during the downstream chlorination of alachlor. The objective was to investigate DBP formation through chlorination of alachlor preoxidized by ZVI/PS. The results found that ZVI/PS preoxidation enhanced the DBP formation, compared with original system without any treatment. The longer the preoxidation time of ZVI/PS during the experiment, the more DBPs that were generated. During 48.0 h chlorination time, the produced DBPs increased to a stable value. Nitrate posed almost no impact on the DBP formation in the ZVI/PS system, while chloride significantly decreased DBP formation, which was attributed to the reduction of trichloromethane. During the chlorination process, alachlor could be further oxidized by remaining PS and free chlorine collectively. ZVI/PS had little effect on the DBP formation in the real water matrix. However, it could reduce carbonaceous DBP formation and increase nitrogenous DBP formation when the real water matrix contained 100 μg/L alachlor. The acute toxicity of alachlor solution could be reduced by the ZVI/PS system, while after chlorination the acute toxicity was largely increased due to the formation of DBPs. With increase of PS concentration, the DBP formation decreased in the ZVI/PS preoxidation system and increased in the system with PS alone. In conclusion, application of ZVI/PS in actual water containing alachlor declined DBP generation by augmenting PS concentration which should consider standard limited value of sulfate. Further investigation is needed for high bromide water.
研究领域:
环境科学
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水处理工程
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Yue Han,Chao Liu,Xiangchen Kong,Xing Wang,Yuyang Fan,Ming Lei,Ming Li,Rui Xiao,Longlong Ma
In this study, two counterexamples of lignin preoxidation-hydroconversion were reported. First, two lignin feedstocks were preoxidized with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) in acetonitrile with various dosages (15%, 30%, and 60%). Then, these preoxidized lignins (HELOs and MWLOs) were hydroconverted in supercritical ethanol catalyzed by Cu/CuMgAlO x . Total yields from HELOs were all higher than those from HEL , indicating the good promotion of DDQ preoxidation on the subsequent hydroconversion of HELOs, especially with the DDQ dosage of 15%. Differently, the promotion effect of DDQ preoxidation on the hydroconversion of MWLOs depended on the DDQ dosage as well as the reaction time. Through the comparison of two counterexamples, this work bursted the myth that preoxidation can always promote the subsequent hydroconversion of lignin, revealed the influence of lignin property, preoxidation degree, and reaction conditions on the subsequent hydroconversion of preoxidized lignin, and presented the new insight into the preoxidation-hydroconversion strategy for lignin.
研究领域:
化学工程
·
催化
·
木质素化学
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DOI
PubMed
高影响因子
Journal of CO2 Utilization
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2021
·
IF 7.132
Zekai Miao,Guofeng Qiu,Xu Zhao,Fanhui Guo,Yixin Zhang,Jianjun Wu
Coal gasification fine slag (FS)-based activated carbons (ACs) for CO 2 capture provided a new method to realize the value-added utilization of FS. Furthermore, pre-oxidation treatment of carbonaceous materials is one of the most efficient possibilities to obtain developed pore structure of activated carbons to enhance the CO 2 adsorption capacity. In this study, four types of oxidizing agents (HNO 3 , NaClO, H 2 O 2 , and air) carefully modified the coal gasification fine slag residual carbon (RC) to fix the oxygen content at about 12 wt%, 15 wt%, and 18 wt%. The samples were characterized by XPS, volumetric sorption analyzer, SEM, Raman spectroscopy, TEM, TG, and TG MS. Results suggested that the specific surface area and total pore volume of the ACs were observed to increase after oxidation. The types of oxygen-containing groups also affected the pore structure of the ACs. The results showed that the content of O C O groups were the most predominant factors for high surface area, and the C O group could hinder the development of pore structure. The ACs facilitated by RC oxidation by HNO 3 had a high CO 2 storage capacity of 12.4 % at 30 °C and a fast adsorption rate, around 86 % of CO 2 uptake occurring in a span of 1 min.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Bing Zhang,Bo Wang,Heli Tang,Qingjie Li,Wenxin Shi
In this study, an innovative ferric tetrasulfide/peroxymonosulfate (Fe 3 S 4 /PMS) pre-oxidation system was integrated into an aerobic granular membrane bioreactor (AGMBR) to alleviate membrane fouling. The role and underlying mechanisms associated with solution pH was also investigated. The results demonstrated that under optimal conditions (pH 6.0, 0.2 g/L Fe 3 S 4 , and 2.0 mM PMS), pre-oxidation treatment significantly reduced the total membrane fouling resistance by 98 % and shifted the fouling mechanism from cake layer fouling to pore blocking fouling. Moreover, pre-oxidation treatment at pH 6.0 enhanced the energy barrier between foulants-membrane and foulants-foulants, thereby alleviating membrane fouling. The key reactive oxygen species were identified as •OH, SO 4 • – , and 1 O 2 with contributions of 7.03 %, 46.62 %, and 22.38 %, respectively. Furthermore, phosphates significantly inhibited the performance of Fe 3 S 4 /PMS oxidation system for mitigating membrane fouling; however, decreasing solution pH alleviated this inhibition effect. Additionally, an inhibiting effect on coating metal oxide or hydroxide on catalyst surface was observed along with variation in surface charge properties of Fe 3 S 4 when pH was decreased to 6.0, which further promoted activation of PMS for mitigating membrane fouling. This study provides a robust theoretical foundation for employing Fe 3 S 4 /PMS pre-oxidation in AGMBR to alleviate membrane fouling issues which represents an important engineering advancement.
研究领域:
环境工程
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水处理技术
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 29
·2400556
·
IF 18.5
Qian Liu,Dongling Wu,Tao Wang,Caige Wang,Dianzeng Jia
The capacitive properties of supercapacitors highly rely on the reasonable design of high-performance electrode materials. Herein, a synergetic strategy of pre-oxidation and pre-carbonization is proposed to prepare coal tar pitch (CTP) based porous carbon. The formation mechanism of porous carbon is revealed. Pre-oxidation increases the heteroatom content and promotes the decomposition of polycyclic aromatic hydrocarbons into small molecules, which is more conducive to improving the subsequent activation and enhancing the microporous specific surface area. Also, the autoclave pre-carbonization promotes the polymerization of the precursors and increases the carbon yield. Benefiting from the synergistic effect of pre-oxidation and pre-carbonation, the obtained carbon exhibits a superior specific capacitance of 365 F g −1 . Meanwhile, ZnCl 2 is used as a hydrogen-bonding acceptor to synthesize ZnCl 2 -EG/PVA deep eutectic solvent (DES) gel, and it is applicable to acidic, neutral, and alkaline electrolytes. The capacitor assembled with the prepared porous carbon and DES gel electrolyte achieves a high energy density of 41.3 Wh kg −1 and works well in unconventional temperatures (−40–75 °C). This work confirms the effect of pre-oxidation and pre-carbonization on the fabrication of CTP-based carbon material and expects to prepare porous carbon using other pre-oxidation/carbonization agents.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Zhiwei Zhou,Tianjie Sun,Xing Li,Jiawei Ren,Zedong Lu,Yuankun Liu,Kai Li,Fangshu Qu
Chemical moderate preoxidation for algae-laden water is an economical and prospective strategy for controlling algae and exogenous pollutants, whereas it is constrained by a lack of effective on-line evaluation and quick-response feedback method. Herein, excitation-emission matrix parallel factor analysis (EEM-PARAFAC) was used to identify cyanobacteria fluorophores after preoxidation of sodium hypochlorite (NaClO) at Excitation/Emission wavelength of 260(360)/450 nm, based on which the algal cell integrity and intracellular organic matter (IOM) release were quantitatively assessed. Machine learning modeling of fluorescence spectral data for prediction of moderate preoxidation using NaClO was established. The optimal NaClO dosage for moderate preoxidation depended on algal density, growth phases, and organic matter concentrations in source water matrices. Low doses of NaClO (<0.5 mg/L) led to short-term desorption of surface-adsorbed organic matter (S-AOM) without compromising algal cell integrity, whereas high doses of NaClO (≥0.5 mg/L) quickly caused cell damage. The optimal NaClO dosage increased from 0.2–0.3 mg/L to 0.9–1.2 mg/L, corresponding to the source water with algal densities from 0.1 × 10⁶ to 2.0 × 10⁶ cells/mL. Different growth stages required varying NaClO doses: stationary phase cells needed 0.3–0.5 mg/L, log phase cells 0.6–0.8 mg/L, and decaying cells 2.0–2.5 mg/L. The presence of natural organic matter and S-AOM increased the NaClO dosage limit with higher dissolved organic carbon (DOC) concentrations (1.00 mg/L DOC required 0.8–1.0 mg/L NaClO, while 2.20 mg/L DOC required 1.5–2.0 mg/L). Compared to other predictive models, the machine learning model (Gaussian process regression-Matern (0.5)) performed best, achieving R 2 values of 1.000 and 0.976 in training and testing sets. Optimal preoxidation followed by coagulation effectively removed algal contaminants, achieving 91%, 92%, and 92% removal for algal cells, turbidity, and chlorophyll-a, respectively, thereby demonstrating the effectiveness of moderate preoxidation. This study introduces a novel approach to dynamically adjust NaClO dosage by monitoring source water qualities and tracking post-preoxidation fluorophores, enhancing moderate preoxidation technology application in algae-laden water treatment.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
PubMed
高影响因子
International Journal of Environmental Science and Technology
·
2020
·Vol. 17
·期 8
·3761-3770
·
IF 2.54
Song Q.,Zhang D.,Niu X.,Li Y.,Ma J.,Fan Y.,Zhou S.
The frequent occurrence of cyanobacteria blooms has gained worldwide concern. The conventional pre-oxidation methods are not only less effective in removing Microcystis aeruginosa cells, but also tend to trigger secondary pollution with an inevitable release of intracellular organic matter. In this study, Fe 2+ /persulfate process was applied to generate sulfate radicals and simultaneously form in situ Fe (III) for integrated oxidation–coagulation, leading to a notable enhancement in M. aeruginosa removal without cell breakage and better control of microcystins. Results showed that the Fe 2+ /persulfate mass ratio of 1:1 and the FeSO 4 dosage of 0.1 mmol/L were efficient in M. aeruginosa removal. With the optimal FeSO 4 dosage, up to 90.1% of M. aeruginosa were removed intact with the cell zeta potential of − 0.814. After settling down of M. aeruginosa within 30 min, the chlorophyll-a removal efficiency reached 98.9% and microcystins decreased remarkably. Furthermore, the degradation of algal organic matters was significantly enhanced with a relatively lower residual Fe. Protein-like substances and dissolved microbial metabolites were preferentially oxidized. The cell lysis only occurred to a small number of M. aeruginosa during the Fe 2+ /persulfate process, preventing from the environmental risk posed. This work demonstrates that an appropriate Fe 2+ /persulfate ratio and FeSO 4 addition is a feasible and promising method for removing M. aeruginosa in an environmental-friendly and cost-effective way.
研究领域:
环境科学
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水处理工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）