JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Chaoyu Li,Tengfei Xie,Huamin Kou,Yubai Pan,Jiang Li
Transparent Fe 2+ :ZnS polycrystals are 3–5 μm mid-IR laser gain materials with great importance. In this paper, a novel route combining wet-chemical co-precipitation, hot-pressed sintering and post hot isostatic pressing (HIP) treatment was proposed for Fe 2+ :ZnS transparent ceramics. Fe 2+ :ZnS powders were synthesized successfully by the wet-chemical co-precipitation method, which was suitable for particle size and morphology controlling and then ceramics consolidation. Transparent Fe 2+ :ZnS ceramics with comparatively high optical quality were successfully fabricated by two step sintering method combining hot pressing and post-HIP treatment. This approach is a promising candidate for fabricating Fe 2+ :ZnS ceramics with large size, low cost, short cycle, and flexible concentration distribution design.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Chengyu Zhang,Zhaodong Nan
Nanoenzymes have been regarded as strong substitutes to natural enzymes in the last decades. However, high concentrations of substrates are always needed because of the low activity of nanozymes, which causes an increase of the cost and an increase in environmental pollution in practical applications. Thus, improved nanozymic activity is still urgent and vital to reduce the need for high concentrations of substrates. A series of binary metal sulfides (FexNi1–xS2), which exhibited intrinsic nanozymic activity, was first synthesized by a hydrothermal method. Among these samples, the nanosheet-shaped Fe0.8Ni0.2S2 showed the highest activity. Compared with those of FeS2, the catalytic constant (Kcat) and catalytic efficiency (Kcat/Km) of Fe0.8Ni0.2S2 increased about 1.9 and 3.6 times, respectively. The Michaelis–Menten constant (Km) of Fe0.8Ni0.2S2 is about 4.7-fold smaller than that of FeS2, and 193-fold smaller than that of natural enzyme horseradish peroxidase (HRP), indicating a stronger affinity to H2O2. The investigation on the mechanism indicated that Fe2+ and Fe3+ in Fe0.8Ni0.2S2 are the active sites. The synergistic effect between Ni2+ and Fe3+ accelerated the conversion from Fe3+ to Fe2+, which improved the nanozymic activity. In addition, Fe0.8Ni0.2S2 can be used as a nanozyme to detect H2O2 and ascorbic acid (AA) within 1 min at room temperature (25 °C). This work extends the development of binary metal sulfides as artificial enzymes.
研究领域:
生物化学
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材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhuoyu Bu,Minhui Hou,Zihao Li,Zhujun Dong,Lusha Zeng,Peng Zhang,Guangyu Wu,Xiang Li,Ying Zhang,Yuwei Pan
Boron was used as an environmentally friendly and efficient reductant to accelerate the recycle of Fe 2+ enhancing peroxymonosulfate (PMS) activation for sulfamethazine (SMT) degradation. The SMT removal was only 28.1% within 30 min in Fe 2+ /PMS system while SMT removal could reach to 98.9% within only 3 min in Boron/Fe 2+ /PMS (B/Fe 2+ /PMS). Electron paramagnetic resonance spectroscopy (EPR) tests, quantitative detection and radical quenching experiments illustrated that OH and SO 4 − played important role and Fe(IV), 1 O 2 and O 2 − also participated in SMT removal. The addition of boron could enhance the role of OH and SO 4 − in SMT removal in Fe 2+ /PMS system. X-ray photoelectron spectroscopy (XPS), electrochemical tests and density functional theory (DFT) calculation were conducted to confirm the mechanism of boron for accelerating the recycle of Fe 2+ . Possible SMT degradation pathway was proposed. B/Fe 2+ /PMS process could efficiently remove SMT at low Fe 2+ dosage and neutral pH. B/Fe 2+ /PMS system also exhibited a superior resistance to inorganic ions and nature organic matters. Moreover, B/Fe 2+ /PMS system had good applicability to different pollutants, excellent reusability for antibiotics removal, and efficient performance for removing antibiotics in nature fresh water. The results compared with others’ works also demonstrated the present study process was a promising strategy for antibiotics removal.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yifan Wang,Mengyun Zhao,Ting Wang,Mengzhu Li,Xilei Lu,Bingchi Li
Environmental application of cornstalk and production of hydrogen from biomass are two vital research topics. Herein, a low-cost easy preparing strategy was proposed for trying to give a solution. Non-noble metal of Fe ion was used as an oxidizing agent and electron stockpile carrier for degrading cornstalk and providing e − to the cathode. Using proton exchange electrolysis technique, it can realize H 2 production with a Faraday Efficiency of 94.65%. Different influence factors including temperature, electrolytic potential and electrolytic current density were studied. To the degradation products , the preliminary analyses by SEM, FT-IR, GC-MS and 2D HSQC NMR were given. The results demonstrate that Fe 3+ /Fe 2+ -cornstalk electrolytic system could give a new pathway for environmental application of cornstalk and production of hydrogen.
研究领域:
环境科学
·
生物能工程
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Jun-Ming Hong,Yu-Feng Xia,Qian Zhang,Bor-Yann Chen
The present study is to investigate the treatment of a disinfectants wastewater containing benzalkonium chloride (BAC) by S 2 O 8 2− /Fe 2+ process and microbial fuel cell (MFC) system was applied as bio-sensor for the toxicity test of degradation products. The operating oxidation conditions have been optimized. The optimal condition for the degradation of BAC were: pH = 5.0, [S 2 O 8 2− ]/[ Fe 2+ ] = 1:2, the removal rate of BAC reaches 91.45%, and the COD removal efficiency was 52.46% after 60 min. The degradation intermediates were identified by GC–MS and the degradation pathway of BAC was proposed. The toxicity and biodegradability of intermediates of BAC after being treated by S 2 O 8 2− /Fe 2+ oxidation was analyzed by MFC system. The generated power of MFC system was closely related to the initial concentration of BAC. The voltage output and maximal power density were increased from 25.42 mV and 1.01 mW/m 2 to 37.80 mV and 12.13 mW/m 2 after 100 mg L −1 BAC was treated by S 2 O 8 2− /Fe 2+ oxidation process. These results indicated that the S 2 O 8 2− /Fe 2+ oxidation shows positive effect for enhancing the biodegradability of intermediates.
研究领域:
环境科学
·
毒理学
·
废水处理
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Caihong Qin,Rongrong Liu,Chaochao Jiang,Mengke Guo,Rui Yu,Jiayu Huang,Wenwen Bai,Xiaoqing Dang
Non-thermal plasma coupling Fe 2+ containing liquid-phase catalysis (NTP-LC/ Fe 2+ ) can effectively reuse the byproduct ozone (O 3 ) of NTP in LC/ Fe 2+ for volatile organic compounds (VOCs) degradation. However, the low recycling rate of Fe 2+ /Fe 3+ resulted in poor catalytic effect of the coupling system. In this study, the chelator protocatechuic acid (PCA) was added to LC/Fe 2+ to enhance the removal of representative VOC acetone. The results showed that adding PCA increased the acetone removal efficiency to 91% and kept O 3 ∼ 100% removed within 180 min. The mechanism of PCA-enhanced acetone degradation was that PCA accelerated the Fe 3+ /Fe 2+ cycle by generating PCA-Fe 3+ chelates, which prevented the Fe 3+ from precipitation and promoted the production of OH and O 2 - for acetone oxidation.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2015
·Vol. 4
·期 5
·M25
·
IF 1.558
Vantu Nguyen,Yueli Liu,Yang Li,Shah Abdul Hakim,Xue Yang,Wen Chen
Fe2(MoO4)3/carbon nanotubes (CNTs) nanocomposite was prepared by a precipitation method and used as a cathode for sodium-ion batteries (SIBs). The field emission scanning electron microscopy (FESEM) test showed that the CNTs and Fe2(MoO4)3 nanosheets formed an interpenetrating network structure. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis confirmed that the Fe2(MoO4)3 was a monoclinic crystal structure and mixed with element states in the nanocomposite. The electrochemical properties of the Fe2(MoO4)3/CNTs nanocomposite were studies by electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge measurement. The results indicated that Fe2(MoO4)3/CNTs nanocomposite had high specific capacity and good cycling stability as a cathode material for SIBs. As the charge/discharge curent density is at 1 C, the initial specific capacity of Fe2(MoO4)3/CNTs nanocomposite is 85 mAhg−1, and it remains 79.81 mAhg−1 after 50 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yuzhu Xue,Weinan Wang,Yanhong Zhang,Qinhua Fan,Ying Zhang,Chen Ling,Yuwei Pan
This study proposes a green purification strategy in which mild decomplexation of Ni-EDTA into other Ni complexes facilitates the efficient removal and recovery of nickel through resin adsorption. Decomplexation of Ni-EDTA by boron/Fe 2+ /H 2 O 2 (B/Fe 2+ /H 2 O 2 ) followed by resins adsorption was conducted for Ni(II) removal in Ni-EDTA. The Ni(II) removal efficiency could only achieve 1.3 % and 6.2 % while Ni(II) coexisted with EDTA but more than 10 times of higher when Ni(II) coexisted with EDTA-relatives via the single adsorption of commercial heavy metal-affined resins (D001 and D463), which attributed to the increased binding energies of these Ni-EDTA’s degradation products complexes than Ni-EDTA based on density functional theory (DFT) calculation. In comparing to precipitation, the resin adsorption required much less mineralization of EDTA to have a better removal efficiency of Ni(II). B improved the efficiency of Ni-EDTA decompexation by accelerating the recycle of Fe 3+ /Fe 2+ . The EDTA (and TOC) removal enhanced from 48.7 % (4.7 %) to 94.7 % (11.9 %) by B/Fe 2+ /H 2 O 2 process comparing to Fe 2+ /H 2 O 2 process. With the high EDTA but low TOC removal efficiency after B/Fe 2+ /H 2 O 2 treatment, Ni(II) removal efficiency via resins adsorption could maximum achieve 80.5 %, 2–3 times of that via regular precipitation method. In addition, B and resins exhibited good reusability in five cycles, and B/Fe 2+ /H 2 O 2 -resins process had excellent adaptability to different heavy metal complexes. B/Fe 2+ /H 2 O 2 -D463 system not only could reduce 78.4 % reagents cost compared with that of Fe 2+ /H 2 O 2 -precipitation process, but also could save much cost than other processes. The results provide new insights for the cost-effective treatment of EDTA-complexed heavy metal wastewater.
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
Water
·
2023
·Vol. 15
·期 10
·1931
·
IF 3.4
Runjuan Zhou,Kuo Zhang,Ming Zhang
A back-propagation neural network (BPNN) was used to model and optimize the process of hydroxylamine (HA)-enhanced Fe2+activating peroxymonosulfate (PMS). Using HA-enhanced Fe2+to activate PMS is a cost-effective method to degrade orange II (AO7). We investigated the individual and interactive effects of the concentrations of Fe2+, HA, and PMS on the degradation of AO7. TheR2of the BPNN model was 0.99852, and the data were distributed aroundy=x. Sensitivity analysis showed that the relative importance of each factor was as follows: HA > Fe2+> PMS. The optimized results obtained by the genetic algorithm were as follows: the concentration of Fe2+was 35.33 μmol·L−1, HA was 0.46 mmol·L−1, and PMS was 0.93 mmol·L−1. Experiments verified that the AO7 degradation effect within 5 min was 95.7%, whereas the predicted value by the BPNN was 96.2%. The difference between predicted and experimental values is 0.5%. This study provides a new tool (machine learning) to accurately predict the concentrations of HA, Fe2+, and PMS to degrade AO7 under various conditions.Keywords:advanced oxidation process;machine learning;BPNN;sensitivity analysis;genetic algorithm
研究领域:
环境科学
·
化学工程
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Wanying Xie,Wei Song,Ji Li,Xiaolei Zhang,Wenyi Dong,Feiyun Sun
Modifying PVDF membrane by blending hydrophilic nano TiO 2 has been highly concerning, but its practical application is not well investigated. In this study, PVDF-TiO 2 membrane was employed in two modes to treat micro-polluted raw water for the first time, direct membrane filtration and pre-oxidation assists membrane filtration. At two filtration modes, the PVDF-TiO 2 membrane had comparable rejection capability to the unmodified PVDF membrane, as the removal of permanganate index (COD Mn ) was 0.26–0.72 mg/L, UV 254 was 0.0070–0.0618 cm −1 , turbidity was 1.60–4.49 NTU, and the total number of colonies was 360–23,780 CFU/mL. As for raw water treatment , using Fe 2+ /sodium dithionite (DTN)/O 2 system as the pre-oxidation process to assist the filtration of the PVDF-TiO 2 membrane was feasible. After optimization, the applicable conditions of the Fe 2+ /DTN/O 2 process were DTN dosage at 100 mg/L and a C Fe / C DTN of 1:4. As a result, the effluent qualities of the PVDF-TiO 2 membrane significantly improved. It was investigated that atrazine (ATZ), COD Mn , UV 254, and turbidity reduced, which was realized by the synergic effects of the pre-oxidation by free radicals and flocculation by iron. Pre-oxidation of the Fe 2+ /DTN/O 2 process could also enhance the permeability of the PVDF-TiO 2 membrane from 53.6 to 58.0 L/(m 2 ·h), nearly two times the PVDF membrane. Besides, the practical fouling of the PVDF-TiO 2 membrane was stably alleviated by the reduced R t , R re, and R ir , mainly due to constraining the internal pore fouling effectively.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Hao-Hua Deng,Kai-Yuan Huang,Meng-Jun Zhang,Zhi-Yan Zou,Ying-Ying Xu,Hua-Ping Peng,Wei Chen,Guo-Lin Hong
In recent years, gold nanoclusters (AuNCs) have received considerable attention as optical transducers in chemo/biosensors. Herein, a facile and efficient assay for NO 2 − has been successfully developed based on the fluorescence quenching of AuNCs co-modified by bovine serum albumin and 3-mercaptopropionic acid (BSA/MPA-AuNCs). In the presence of NO 2 − under acidic conditions, Fe 2+ can be readily oxidized and transformed to Fe 3+ , which can significantly suppress the fluorescence of BSA/MPA-AuNCs via non-radiative electron-transfer mechanism. The linear range and detection limit for this system were found to be 5–30 μM (r = 0.9975) and 0.7 μM, respectively. Other common anions and cations showed only very minor interference with the NO 2 − detection. Furthermore, the effectiveness of the proposed sensing strategy was validated by the demonstration of good performance in the determination of the amount of NO 2 − in ham samples, rendering it a powerful tool for the assessment of food security and water quality.
研究领域:
分析化学
·
生物传感
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Zimu Xu,Xiaojuan Xue,Shuheng Hu,Yunxia Li,Jie Shen,Yan Lan,Rongxing Zhou,Fan Yang,Cheng Cheng
Norfloxacin (NOR) is a typical kind of Fluoroquinolone antibiotics which is extensively used around the world. Residues of NOR have been found continuously increasing in the water systems thus posing detrimental effects to the aquatic ecosystem and human health. In this study, the degradation effect and mechanism on NOR in aqueous solution are investigated by gas-liquid phase dielectric barrier discharge (DBD) plasma combined with different catalysts (H 2 O 2 or Fe 2+ ). The concentrations of three representative plasma-generated long-lived reactive species (H 2 O 2 , O 3 and N O 3 - ) were measured in dH 2 O and found enhancing with the lengthening discharge period. Variations on the treatment parameters were carried out in discharge power, initial solution pH and the concentration of catalysts. A discharge power at 60 W provided optimal balance on the degradation effect and energy efficiency would be beneficial, while there is not much impact from the initial solution pH on NOR degradation. Both H 2 O 2 and Fe 2+ at low concentration (0.5–10 mg/L of Fe 2+ , 0.1–1.0 mmol/L of H 2 O 2 ) were observed contributing to the improvement on the NOR degradation rate, while inhibition would occur at high concentration (10–20 mg/L of Fe 2+ , 1.0–2.0 mmol/L of H 2 O 2 ). The DBD/H 2 O 2 (0.5 mmol/L)/Fe 2+ (10 mg/L) system was found the optimal condition to achieve a high NOR degradation rate of more than 98% after plasma treatment for only 0.5 min at discharge power of 60 W. Moreover, 72.3 ± 1.7% of the total organic carbon (TOC) in NOR solution have been removed in the DBD/Fe 2+ (10 mg/L) system at 15 min which signifies a high mineralization efficiency. The cleavage of piperazine ring and quinolone ring, defluorination and hydroxylation are considered the major pathways for NOR degradation. The biological toxicity of the plasma/Fe 2+ -induced degradation intermediates has been detected and it fluctuated with the treatment time and finally declined. Therefore, the DBD/catalyst system could be an effective and promising method on pharmaceutical wastewater treatment in the future.
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）