JOM
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2022
·Vol. 74
·期 5
·1934-1944
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IF 2.597
Liu Peiwen,Fei Zitong,Zhang Yingjie,Dong Peng,Meng Qi,Yang Xi
Developing a green and efficient approach for recovering Li from cathode materials is important in recycling spent LiFePO 4 batteries. A facile and efficient oxidation process was developed to selectively recover Li from spent LiFePO 4 batteries. The common oxidant NaClO was used to avoid using acid or alkali in the leaching process. The leaching rate of Li reached 99.8% under the selective optimal leaching conditions of 0.54 mol/l NaClO, leaching time 60 min, leaching temperature 60°C and solid–liquid ratio 1 g/l. The high leaching efficiency can be ascribed to the combination of oxidability and high pH value of the NaClO solution. Meanwhile, leaching and precipitation were carried out simultaneously in this process, which promoted the leaching reaction. High performance LiFePO 4 /C was resynthesized using the recovered products. The specific capacity of the first discharge at 1 C was 147.1 mAh/g and the capacity retention rate at 1 C was 97.55% after 200 cycles. The oxidation approach is acid free and has low energy consumption for green recovery of spent LiFePO 4 batteries.
研究领域:
材料科学
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环境科学
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能源技术
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
·
IF 5.455
Dandan Diao,Haoyi Zhang,Jingui Wang,Qiang Xiao
Two-dimensional (2D) zeolite nanosheets open exciting opportunities for the application in catalysis and separations. Exfoliation of layered zeolite shows a promising way for the preparation of 2D zeolite nanosheets. Herein, non-swollen MCM-22P with ordered layer spacing was successfully exfoliated to dispersible MWW nanosheets. Firstly, a wet-oxidization method, i.e., heating in a mixture of H 2 SO 4 and H 2 O 2 (called piranha solution) was adopted to remove the template of pyridine (PI) from as-synthesized MCM-22P zeolite. IR, TG, XRD , N 2 adsorption confirmed that the wet-oxidization could efficiently remove PI from MCM-22P zeolite while preserving the MWW crystal structure. Exfoliation of the detemplated MCM-22P zeolite was successfully achieved by an ultrasonic treatment in water. After purification by sedimentation, 2D MWW zeolite nanosheets dispersed in aqueous solution were obtained. The monolayer MWW nanosheets with high purity are confirmed by SEM and TEM observations. The wet oxidation followed by the sonication method provides an alternative way for the exfoliation of layered zeolite to dispersed nanosheets.
研究领域:
材料科学
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催化与分离技术
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Mingfu Zu,Mingqi Lin,Ren Huang,Bobing Tian,Chao Xiao
Interphase mass transfer is acknowledged as the rate-limiting step of simultaneous desulfurization and denitrification by wet oxidation . For this issue, this study established a venturi reactor to facilitate interphase mass transfer between flue gas and absorbent (NaClO 2 solution), and to improve the efficiency of simultaneous desulfurization and denitrification. The effects of flow rate of jet, NaClO 2 concentration, initial pH of solution, SO 2 and NO volume concentration on the efficiency of desulfurization and denitrification were investigated. The results showed that SO 2 can be completely removed at all experimental conditions. The denitrification efficiency decreased as jet flow rate increased from 8.38 L/ min to 12.87 L/min. The denitrification efficiency and overall mass transfer coefficient increased as the NaClO 2 concentration increased from 0.01 wt% to 0.025 wt%. When the pH of the absorbent decreased from 9 to 3, the denitrification efficiency was improved significantly. An increasing SO 2 volume concentration promoted NO removal efficiency, while SO 2 and NO competed to inhibit denitrification at NaClO 2 deficiency. The denitrification efficiency firstly increased and then decreased, with an increasing NO volume concentration from 500 to 1700 ppm. This study provides an important theoretical basis for the industrial application of simultaneous desulfurization and denitrification in venturi reactors.
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
RSC Advances
·
2022
·Vol. 12
·期 55
·35666-35675
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IF 4.036
Junhao Hu,Qiong Yi,Ziyi Xiao,Feng Tian,Tingting Shu,Xiaolan Liu,Yingxi Wang,Ling Li,Jiangang Zhou
Doxorubicin (DOX) has been an emerging environmental pollutant due to its significant genotoxicity to mankind. Advanced oxidation processes are a potential strategy to remove DOX in water solution. To develop a highly efficient catalytic agent to remove DOX, bimetal MOFs were synthesized, with Cu2+ and Co2+ as the central ions and adenine as the organic ligand. This study investigated the degradation of DOX by Co/Cu-MOFs combined with peroxymonosulfate (PMS). It was found that the degradation of DOX by Co/Cu-MOFs can reach 80% in only 10 seconds. This can be explained by the charge transfer from Co(III) to Co(II) being accelerated by Cu2+, resulting in the rapid generation of free radicals, which was proved by the EIS Nyquist diagram. Co/Cu-MOFs can be reused by simply washing with water without inactivation. Therefore, Co/Cu-MOFs can be used as an efficient catalytic agent to degrade DOX in environmental water.
研究领域:
环境科学
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材料科学
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药学
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DOI
PubMed
高影响因子
FIBERS AND POLYMERS
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2024
·Vol. 25
·期 11
·4271-4281
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IF 2.2
Hou Mohan,Wang Lifang,Xu Qiuyu,Zhang Xuepeng,Yang Xue,Zhang Lei,Bai Yun,Li Yanyun,Liu Lifang
Waste cotton fibers are an ideal raw material for extracting nanocellulose crystals (CNCs), benefitting from their high cellulose content. In this study, the waste cotton fibers from the calendering finishing process were used to extract CNCs by sulfuric acid, TEMPO oxidation, and phosphoric acid methods, aiming to create a new way to reutilize the waste cotton fiber and also to verify the practicability that the phosphoric acid method can replace sulfuric acid and TEMPO oxidation methods. The CNCs obtained from the three methods are all in cellulose I state with an average length of 200-500nm and diameter of 15-20nm, indicating that the waste cotton fiber can extract CNCs. However, the CNCs from the phosphoric acid method showed the highest thermostability but the lowest crystallinity, while the ones from the sulfuric acid and TEMPO oxidation methods had higher crystallinity but lower thermal stability. Overall, the three methods are all acceptable for preparing CNCs, but the phosphoric acid method has more significant potential due to its low cost, environmental friendliness, and safety. Graphical abstract
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHROMATOGRAPHIA
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2013
·Vol. 76
·期 23
·1649-1655
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IF 1.437
Wu Anguo,Duan Tingting,Tang Dan,Xu Youhua,Feng Liang,Zheng Zhaoguang,Zhu Jiaxiao,Wang Rushang,Zhu Quan
Nitrite and nitrate are main stable products of nitric oxide, a pivotal cellular signaling molecule, in biological fluids. Therefore, accurate measurement of the two ions is profoundly important. Nitrite is difficult to be determined for a larger number of interferences and unstable in the presence of oxygen. In this paper, a simple, cost-effective and accurate HPLC method for the determination of nitrite and nitrate was developed. On the basis of the reaction that nitrite is oxidized rapidly to nitrate with the addition of acidic potassium permanganate, the determination of nitrite and nitrate was achieved by the following strategy: each sample was injected twice for HPLC analysis, i.e. the first injection was to measure nitrate, and the second injection was to measure total nitrate including initial nitrate and the nitrate from the conversion of nitrite with the addition of acid potassium permanganate in the sample. The amount of nitrite can be calculated as difference between injections 2 and 1. The HPLC separation was performed on a reversed phase C 18 column for 15 min. The mobile phase consisted of methanol–water (2:98 by volume); the water in the mobile phase contained 0.60 mM phosphate salt (potassium dihydrogen and disodium hydrogen phosphate) and 2.5 mM tetrabutylammonium perchlorate (TBAP). The UV wavelength was set at 210 nm. Additionally, we systemically investigated the effects of the concentration of phosphate salt and TBAP in the mobile phase, the pH of the mobile phase, and the amount of acidic potassium permanganate added to the sample on the separation efficacy. The results showed that the limits of detection (LOD) and the limit of quantitation (LOQ) were 0.075 and 0.25 μM for nitrate (containing the oxidized nitrite), respectively. The linear range was 1–800 μM. This developed approach was successfully applied to assay nitrite/nitrate levels in cell culture medium, cell lysate, rat plasma and urine.
研究领域:
生物化学
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医学检验
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DOI
PubMed
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 89
·期 8
·2060-2072
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IF 2.5
Li Yuhong,Wang Mingshi,Zhang Dong
View large Download slide View large Download slide Close modal A wet chemical oxidation (WCO) method has been widely used to obtain the dissolved organic carbon (DOC) content and carbon isotope ( δ 13 C DOC ) ratios. However, it is sometimes difficult to get high precision results because not enough CO 2 was oxidized from the natural water samples with low DOC concentrations. This improvement primarily aims to increase the water sample volume, improve the removal rate of dissolved inorganic carbon (DIC), and minimize the blank DOC from the standard solution. Following the improved procedure, the δ 13 C ratios of standardized DOC solutions were consistent with their actual values, and their differences were less than 0.2‰. The improved method demonstrated good accuracy and stability when applied to natural water samples with DOC concentrations ≥0.5 mg L −1 , with the precisions of DOC concentrations and δ 13 C ratios were better than 0.07 mg L −1 and 0.1‰, respectively. More importantly, this method saved much pre-treatment time and realized batch processing of water samples to obtain their DOC contents and isotope ratios. The CO 2 peak values of the water samples were within the optimal testing range of the instrument. Low-temperature nitrogen purging can more thoroughly remove DIC from water samples. The precision of the DOC concentration in the water samples was better than 0.07 mg L −1 . The precision of the δ 13 C DOC values in the water samples was better than 0.1‰.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Kaifeng Du,Shikai Li,Liangshen Zhao,Liangzhi Qiao,Hao Ai,Xiaohong Liu
Cellulose beads consist of natural polysaccharide fibers and are widely used in various industrial materials and applications. Nevertheless, the key challenge is how to effectively avoid the tedious preparation process and environmentally harmful chemicals that exist in traditional fabrication routes. This study proposes a green and facile route to fabricate porous cellulose beads by selecting bamboo fibers as raw material. Without a tedious multistep process (dissolution, emulsification, and regeneration) and environmentally harmful solvents, porous cellulose beads were formed directly on bamboo fibers under aqueous phase with sodium periodate. Varied methods of SEM, XRD were applied to characterize porous cellulose beads at different fabrication stages. By this investigation, the feasible mechanism toward spherical cellulose formation was raised. After being modified with glycine, the cellulose beads were evaluated by means of adsorption isotherm and kinetics for investigating their adsorption potential by using Co2+ and Cu2+ as probes. All of the results illustrated that the porous cellulose beads by this strategy showed excellent adsorption efficiency for the removal of metal ions from wastewater.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Jiahuan Cao,Yujia Wu,Yinghuan Fu,Yu Song,Guowen Wang,Hongchao Ma
Photocathodic protection is a promotion strategy for the corrosion protection of metallic materials, and the selection of photocathodic materials is a critical factor in improving the performance of photocathodic protection of metallic materials. Herein, a Ti-P-V-O composite semiconductor photoelectrode with an adjustable porous structure was prepared by the micro-arc oxidation (MAO) method using titanium alloy (TC 4 ) as the matrix and ammonium metavanadate (NH 4 VO 3 ) as the additive. The photogenerated open circuit potential, instantaneous photocurrent density response value, electrochemical impedance spectroscopy, and Tafel curve of as-prepared Ti-P-V-O photo-electrodes were measured after coupling with 304SS to clarify the cathodic protection effect for 304 stainless steel (304SS). It is found that the as-prepared Ti-P-V-O coating photoelectrode has a more negative open circuit potential, a more significant photocurrent density response, more effective interface carrier transport ability, lower resistance, lower compounding efficiency of photogenerated electron/hole pairs, and more negative conduction band level, as compared with that of TiO 2 coatings. Moreover, the optimized Ti-P-V-O photoelectrode (Ti-P-V-O&300 V) exhibited the maximum negative shift of the corrosion potential (410 mV vs. SCE) for coupling with 304 stainless steel. This work presents a new strategy for constructing an efficient coating photo-electrode for photocathodic protection of metallic materials.
研究领域:
材料科学
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电化学
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腐蚀防护
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2017
·
IF 2.764
Chao Li,Weiyi Yang,Qi Li
To develop TiO 2 -based photocatalysts with visible light activity for better solar energy utilization, a simple flash oxidation method was developed by calcining commercial TiN nanoparticle to prepare N-doped TiO 2 photocatalyst and TiN/TiO 2 composite photocatalysts through the modulation of the calcination time and temperature. It was found that more energy and processing time were needed to prepare N-doped TiO 2 photocatalyst than that of TiN/TiO 2 composite photocatalyst during this process, while TiN/TiO 2 composite photocatalyst had a better visible light absorption/photocatalytic performance than that of N-doped TiO 2 photocatalyst prepared from the oxidation of the same TiN precursor. Thus, the preparation of TiN/TiO 2 composite photocatalyst from TiN precursor should be a more preferred approach than the preparation of N-doped TiO 2 photocatalyst for visible-light-activated photocatalysis for its cost-effectiveness.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei Lin,An Ding,Chuangxin Gong,Xiuxiang Ding,Peter Desmond,Piotr Oleskowicz-Popiel,Xu He,Jun Ma,Huu Hao Ngo
Sludge reduction is essential for mitigating the environmental hazards associated with sludge. The use of ferric chloride (Fe(III)) catalyzed ferrate (Fe(VI)) can significantly enhance sludge dewaterability by increasing the Fe(VI) oxidation rate and maintaining in-situ enhanced coagulation. However, its weak oxidation ability at the sludge’s original pH limits its practical application. To address this, hydrogen peroxide (H 2 O 2 ) strengthened Fe(VI)/Fe(III) was employed to efficiently improve sludge dewaterability without pH adjustment, thereby enhancing the environmental utilization capacity of sludge. Compared to raw sludge, the treatment of Fe(VI)/Fe(III)–H 2 O 2 resulted in approximately the 95% reduction in specific resistance to filtration (SRF) and increased the bioavailable phosphorus (P) content in dewatered sludge. During the oxidation process, highly reactive species such as tetravalent iron (Fe(IV)) and hydroxyl radicals ( OH) were generated, facilitating the release of tightly bound water in extracellular polymeric substances (EPS). Importantly, the oxidation process was divided into three stages (persistent moderate oxidation — fast strong oxidation — sustained weak oxidation) based on the predominant reactive species (Fe(IV) or OH). This division promoted more robust and more durable oxidation processes. Phased enhanced coagulation occurred during the oxidation process. The gradual increase in Fe(III) content led to the re-flocculation of damaged EPS, enlarging the size of sludge drainage pores/channels and improving water discharge efficiency. Additionally, the costs and carbon emissions of chemicals for the Fe(VI)/Fe(III)–H 2 O 2 process were 18% and 52% lower than those of the traditional Fenton method. This study not only achieves the goals of sludge reduction and resource collection but also provides insights into selecting sludge conditioning methods that meet pollution reduction and carbon emission reduction requirements.
研究领域:
环境科学
·
污水处理
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DOI
高影响因子
Journal of Ocean University of China
·
2015
·Vol. 14
·期 6
·989-993
·
IF 0.558
Xue Yuejun,Ge Tiantian,Wang Xuchen
Radiocarbon ( 14 C) measurement of dissolved organic carbon (DOC) is a very powerful tool to study the sources, transformation and cycling of carbon in the ocean. The technique, however, remains great challenges for complete and successful oxidation of sufficient DOC with low blanks for high precision carbon isotopic ratio analysis, largely due to the overwhelming proportion of salts and low DOC concentrations in the ocean. In this paper, we report an effective UV-Oxidation method for oxidizing DOC in natural waters for radiocarbon analysis by accelerator mass spectrometry (AMS). The UV-oxidation system and method show 95%±4% oxidation efficiency and high reproducibility for DOC in both river and seawater samples. The blanks associated with the method was also low (about 3 µg C) that is critical for 14 C analysis. As a great advantage of the method, multiple water samples can be oxidized at the same time so it reduces the sample processing time substantially compared with other UV-oxidation method currently being used in other laboratories. We have used the system and method for 14 C studies of DOC in rivers, estuaries, and oceanic environments and have received promise results.
研究领域:
海洋学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）