JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Peiwen Liu,Yannan Zhang,Peng Dong,Yingjie Zhang,Qi Meng,Siyuan Zhou,Xuan Yang,Mingyu Zhang,Xi Yang
Direct regeneration has been widely applied in recovery of LiFePO 4 batteries. However, excess residual carbon and inherent low electronic and ionic conductivity of spent LiFePO 4 /C cathode materials lead to the reduction of electrochemical performance. Herein, a facile and simple regeneration process of pre-oxidation and vanadium doping is developed to regenerate LiFePO 4 /C cathode materials . Pre-oxidation was applied to remove excess carbon at 500 °C for 3 h in air. Vanadium doping was applied to improve electronic and ionic conductivity of regenerated cathode materials. Among the regenerated cathode materials, the 3 mol% V doped sample possesses discharge capacity of 134.3 mAh/g after 200 cycle at 1C with the discharge capacity retention of 99.1%. At 2, 5, 10C, the discharge capacities are 134, 124.1, 111.5 mAh/g, respectively. The vanadium doping regeneration process with oxidation pre-oxidation is simple, and feasible to be applied in the recovery of spent LiFePO 4 cathode materials.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Shinan Xu,Guodong Kang,Bihai Chen,Yunhao Li,Xingming Jie,Yiming Cao,Xiaoyan Fu,Wu Kuang,Ning Cao,Haijun Yu
In this study, an innovative strategy of fabricating Janus hollow fiber membrane to produce microbubbles for enhancing CO 2 removal was proposed. The polyvinylidene difluoride (PVDF) hollow fiber membrane was prepared using two different hydrophilic dopes followed by modification with 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (FAS). The contact angle of the Janus hollow fiber membrane was 37° for the outer layer and 122° for the inner layer. Attenuated total reflectance Fourier transform infrared spectrometer (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) were employed to verify the grafting of FAS onto the inner layer of membrane. The unique morphology showing a progressive transition from sponge-like to finger-like pores, extending from the inner to the outer layer, was examined using a scanning electron microscope (SEM); this morphology helped reduce mass transfer resistance. Microbubbles were produced by the prepared Janus hollow fiber membrane at high and consistent fluxes. The CO 2 mass transfer flux reached 5.0 × 10⁻³mol m⁻ 2 s⁻ 1 under the gas-liquid pressure difference of 0.10 MPa. The average size of microbubbles was 75 μm and the CO 2 removal rate was nearly 100 % in CO 2 removal experiments. The Janus hollow fiber membrane developed in this study exhibited good aeration property and application potential in post-combustion CO 2 capture.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Jingze Hu,Qingji Wang,Yuxian Wang,Qinghong Wang,Zhuoyu Li,Chunmao Chen
Natural minerals show potential for catalytic ozonation in industrial wastewater treatment . In this study, the efficiencies and mechanisms of two natural iron ores in catalytic ozonation processes (COPs) for aqueous nitrobenzene degradation were initially investigated. Compared with single ozonation process, the removal of TOC increased by about 60 % and 35 % in COPs with natural magnetite and pyrite, respectively. Both natural magnetite and pyrite could promote O 3 decomposition to form hydroxyl radicals and 1 O 2 . But the inner reaction pathways were different. The natural magnetite facilitated O 3 decomposition through the Lewis acids and the electron transfer between Fe(II)/Fe(III) on the catalyst surface, while electron transfer was the only pathway for O 3 decomposition by natural pyrite. Continuous flow fixed-bed reactor was adopted to provide better simulation of the practical operation conditions, so that the potential of engineering application could be evaluated. The natural magnetite exhibited excellent catalytic activity and stability during long period continuous operation in fixed-bed reactor. The removal of TOC maintained at 81.9 % under the optimized operating parameters of hydraulic retention time (2.84 h), O 3 velocity (0.25 L min −1 ) and O 3 concentration (30 mg L −1 ). HCO 3 − and PO 4 3− obviously inhibited the TOC removal efficiencies through radical scavenging and surface –OH occupying. While low concentration of Cl − and SO 4 2− showed negligible effect on the mineralization of aqueous nitrobenzene. After the continuous operation for 672 h, the removal of TOC for nitrobenzene solution in the magnetite-COP system was still stable at about 80 %. The present study demonstrated the engineering application prospect of the natural iron ores in catalytic ozonation treatment of recalcitrant chemical wastewaters.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Zhongqing Yu,Yabing Sun,Guyu Zhang,Chunxiao Zhang
This study investigated the degradation feasibility of N, N-diethyl-m-toluamide (DEET) in aqueous solution by water falling film dielectric barrier discharge (DBD) plasma under three different operating modes. The results exhibited that bubbling the gas of discharge area into DEET solution at the same time of DEET solution flowing through the discharge area (model-3) achieved better effect, the degradation efficiency and rate constant of 300 mL DEET solution with initial concentration of 20 mg/L could reach 76.8% and 0.0526 min −1 , respectively, after 27 min. In addition, the energy yield of model-3 was highest. The reactive species (H 2 O 2 , O 3 ) generated from the DBD system were measured, and the effects of different radical scavengers were analysed. Meanwhile, the removal efficiency of total organic carbon (TOC) in model-3 was much higher, could reach about 24%. The effects of various parameters such as discharge voltage, initial pH, gas bubbling flowrate and liquid circulation flowrate on the degradation of DEET in model-3 were further examined and it was also observed that higher discharge voltage, lower pH, larger gas bubbling flowrate and larger liquid circulation flowrate could promote the removal of DEET. Finally, the DEET degradation pathway was deduced based on HPLC-MS analysis and Gaussian calculation.
研究领域:
环境科学
·
化学工程
·
等离子体技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2021
·
IF 5.565
Liang Wang,Ben Zhang,Bin Zhao,Saiguo Yang,Kun Wu,Jingqiu Sun,Chengzhi Hu
Surfactants are widely used to improve the solubility of oil in water in petrochemical, making it more difficult to remove oil–water emulsions during the water treatment process. Electrocoagulation (EC) is an appropriate method for treating oily wastewater and destabilizing emulsions. However, the demulsification mechanism of oil–water droplets emulsified by surfactants with different charges have not been investigated systematically. The demulsification performance of electrocoagulation on emulsions wastewater containing cationic, non-ionic, and anionic surfactants was studied. The results showed that the removal rate of total organic carbon (TOC) in oily wastewater with anionic surfactant by EC reached 92.98% ± 0.40% at a current density of 1 mA/cm 2 , while that of the non-ionic surfactant was 84.88% ± 0.63%. The characterization of flocs showed that EC has the highest coagulation and demulsification of oil droplets with a negative charge on the surface (−70.50 ± 10.25 mV), which indicated that the charge neutralization of oil droplets was beneficial for the destabilization of the formed oily flocs. However, when the zeta potential of the oil droplets reached 75.50 ± 1.25 mV, the TOC removal efficiency was only 11.80% ± 1.43%. The TOC removal could achieve 33.23% ± 3.21% when the current density improved from 1 mA/cm 2 to 10 mA/cm 2 . The enhanced removal was due to the sweep coagulation rather than charge neutralization. This study provides a fundamental basis for the electrochemical treatment of oily wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Hai Chen,Jianlong Wang
In this study, the degradation and mineralization of sulfamethoxazole (SMX) by ozonation and ionizing radiation were investigated respectively, and the performance of the combined process of ozonation and ionizing radiation was evaluated. Results showed that complete degradation of SMX could be obtained by ozonation in 12 min or by ionizing radiation with the absorbed dose of 1.5 kGy. However, the mineralization of SMX was very limited in ozonation and ionizing radiation system, TOC removal efficiency was less than 15% and 27% in single-ozonation and single-radiation process, respectively. The combination of ozonation and radiation process obviously enhanced the mineralization of SMX, TOC removal efficiency increased to 65.7%. Moreover, the ozonation-radiation process also exhibited good performance in the mineralization of sulfamethazine (SMT) and sulfanilamide (SM), suggesting a good application prospect of the combined process in treating wastewater contaminated with antibiotics. In addition, some different intermediate products were identified during SMX degradation in ozonation process and ionizing radiation process by a high-performance liquid chromatography-mass spectrometry (LC-MS), and possible pathways of SMX degradation by ozonation and radiation were proposed.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Jing Zhang,Xiaolong Yao,Yue Zhao,Rengui Li,Xiaofei Chen,Haibo Jin,Huangzhao Wei,Lei Ma,Zhao Mu,Xiaowei Liu
Wastewater treatment, especially the efficient degradation of contaminants such as m-cresol, remains a pivotal challenge. This study investigates the application of artificial neural networks (ANN) in predicting total organic carbon (TOC) removal rates from m-cresol-contaminated wastewater by using the ultraviolet (UV)-Fenton oxidation process. Six key variables, namely, Fe2+ dosage, H2O2 dosage, catalyst quantity, reaction time, pH, and substrate concentration, were employed as inputs to the ANN model. Leveraging this multivariable input and a comprehensive data set, the ANN model projected a maximum TOC removal rate of 87.12%, validated by an efficiency of 86.26% achieved through experiments under the derived optimal conditions: Fe2+ dosage at 16.09 mg/L, H2O2 dosage at 1.40 mg/L, catalyst quantity at 0.11 g/L, reaction time of 29.80 min, initial pH of 3.66, and substrate concentration of 50 mg/L. Comparative analysis with other machine learning algorithms further revealed that the ANN model notably outperformed linear regression, support vector regression, and random forest in terms of precision. This work paves the way for resource-optimized experimental designs, fostering real-time wastewater monitoring and refining advanced oxidation process proficiency in industrial applications.
研究领域:
环境科学
·
人工智能
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jingzhen Wang,Chunshuai Cao,Yuanyuan Wang,Yingnan Wang,Binbin Sun,Lingyan Zhu
The strong persistence, wide presence and potential toxicities of perfluorooctanoic acid (PFOA) in aquatic environment makes it a challenge to develop advanced technologies to eliminate it from water. In this study, novel BiOI@Bi 5 O 7 I p-n heterojunction photocatalysts were facilely prepared by calcinating BiOI at 350 °C < T < 410 °C. Under simulated solar light irradiation, the degradation rate constant ( k = 0.247 h −1 ) of PFOA by the BiOI@Bi 5 O 7 I heterojunction prepared at 390 °C (T-390) was four times of that by pristine BiOI ( k = 0.061 h −1 ) and 1.2 times of that by Bi 5 O 7 I (prepared at 410 °C, k = 0.206 h −1 ). T-390 also exhibited excellent mineralization efficiency by removing about 60% of total organic carbon in 6 h of irradiation. The significantly enhanced photocatalytic activity of BiOI@Bi 5 O 7 I composite was mainly attributed by the unique band gap structure of the p-n heterojunction, which enhanced the visible-light absorbance and accelerated the separation of photogenerated charge carriers. The generated intermediate products were analyzed by ultra-performance liquid chromatography-mass spectrometry, and the results indicated that PFOA was decomposed by stepwise losing CF 2 units. The BiOI@Bi 5 O 7 I heterojunction also possessed very good durability and reusability, displaying a great potential in PFOA containing water treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Jingzhen Wang,Chun-Shuai Cao,Yinqing Zhang,Lingyan Zhu
Perfluorooctanoic acid (PFOA) is refractory owing to the strong C-F bonds and is extremely difficult to be degraded by traditional photocatalysts. In this study, an S-scheme heterojunction was successfully synthesized by incorporating BiOF with wide-bandgap Bi 7 O 5 F 11 . Theoretical calculations, in situ X-ray photoelectron spectroscopy and Kelvin probe force microscopy verified that a build-in electric field was created in the heterojunction, facilitating the separation of electron-hole pairs. Thus, the photoexcited electrons in the conduction-band (CB) of BiOF rapidly recombined with holes in the valence-band (VB) of Bi 7 O 5 F 11 , leading to enrichment of the highly reductive electrons in CB of Bi 7 O 5 F 11 and strongly oxidative holes in VB of BiOF. Additionally, the strong interaction between Bi 7 O 5 F 11 /BiOF and PFOA is conducive to electron transfer from catalyst surface to PFOA. Thus, BOF-2 displayed superbly-high photoactivity to decompose PFOA. PFOA (5 mg/L) was decomposed within 1 h, and 53% of total-organic-carbon was removed in 2 h of irradiation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Xufang Li,Weiyu Chen,Luming Ma,Hongwu Wang,Jinhong Fan
An Fe-based catalyst was used as a heterogeneous catalyst for the ozonation of industrial wastewater , and key operational parameters (pH and catalyst dosage) were studied. The results indicated that the Fe-based catalyst significantly improved the mineralization of organic pollutants in wastewater. TOC (total organic carbon) removal was high, at 78.7%, with a catalyst concentration of 200 g/L, but only 31.6% with ozonation alone. The Fe-based catalyst significantly promoted ozone decomposition by 70% in aqueous solution. Hydroxyl radicals (·OH) were confirmed to be existed directly via EPR (electron paramagnetic resonance) experiments, and ·OH were verified to account for about 34.4% of TOC removal with NaHCO 3 as a radical scavenger. Through characterization by SEM-EDS (field emission scanning electron microscope with energy-dispersive spectrometer), XRD (X-ray powder diffraction) and XPS (X-ray photoelectron spectroscopy), it was deduced that FeOOH on the surface of the catalyst was the dominant contributor to the catalytic efficiency. The catalyst was certified as having good stability and excellent reusability based on 50 successive operations and could be used as a filler simultaneously. Thereby, it is a promising catalyst for practical industrial wastewater advanced treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Wei Li,Cheng Chen,Junyi Zhu,Lixiang Zhou,Yeqing Lan
Micro-scale zinc-copper (mZn/Cu) bimetallic particles were prepared via precipitating Cu on the surface of Zn and were for the first time applied in the aniline degradation. The results showed that the degradation efficiency of aniline was greatly related to the theoretical Cu mass loading and the initial pH. The optimal Cu loading and initial pH for the destruction of aniline were determined as 60.45 wt% and 3, respectively. To further assess the high reactivity of mZn/Cu, the removal of aniline and total organic carbon (TOC) was investigated in different systems. The degradation of aniline by mZn, mCu, and mZn + mCu was <5% within 75 min. However, 97% of aniline (10 mg L −1 ) was decomposed and 47% of TOC was removed by mZn/Cu, both of which were more than three times as much as those by mFe/Cu. The mechanism investigations revealed that • OH radicals engendered from the reaction process are responsible for the rapid oxidative degradation of aniline. Furthermore, based on the analyses of the intermediates via LC–MS, the possible degradation pathways of aniline were proposed. Our findings suggested that mZn/Cu is a potential approach for aniline removal, which is different from the other bimetallic systems reported in the previous studies mainly as the reductive degradation.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Han Tang,Zan Dai,Xiande Xie,Zhipan Wen,Rong Chen
A novel Cu 0.84 Bi 2.08 O 4 /PDS/visible-light (VL) system has been developed for efficient ciprofloxacin (CIP) degradation, which displayed much higher degradation activity and total organic carbon (TOC) removal efficiency than those of many bismuth-based and copper-based materials under visible light irradiation. More than 90% CIP could be removed over Cu 0.84 Bi 2.08 O 4 /PDS/VL system within 400 min. More importantly, the CIP degradation products completely lost the antibacterial activity towards Staphylococcus aureus , lowering the risk for the emergence of the drug resistance. Electron paramagnetic resonance (EPR) and trapping experiments demonstrated that sulfate radicals were the dominated reactive species and responsible for CIP degradation. Moreover, the Cu 0.84 Bi 2.08 O 4 /PDS/VL system maintained its high degradation capability and original composition after several recycles and easily recovered to its original activity after regeneration. The pH value, anions and ion strength had slightly influence on the CIP degradation over this reaction system. Moreover, Cu 0.84 Bi 2.08 O 4 /PDS/VL system also exhibited high activity for CIP degradation in actual river water. The results provided a new insight into the PDS activation for degradation of organic pollutants, which indicated a huge potential in practical wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）