PETROLEUM SCIENCE AND TECHNOLOGY
·
2023
·
IF 1.5
Xiong Ying,Zhou Houan,Zhou Lang,Pu Junhong
In this paper, a dithiocarbamate-type flocculant DTC-TETA was prepared by using triethylenetetramine as the material and combination of DTC-TETA and polyacrylamide was used for the coagulation-flocculation of flowback water from shale gas hydraulic fracturing (FWSG). The coagulation-flocculation process was optimized by using turbidity as index and the recommended process was as follows: DTC-TETA dosage 200 mg/L, anionic polyacrylamide AN905 dosage 1 mg/L, flocculation stirring speed 200 rpm, flocculation stirring time 3 min and settlement time 5 min. The turbidity of FWSG can be reduced to be 13 NTU from the initial turbidity of more than 2000 NTU under the recommended process. The performance of DTC-TETA was much better than that of polyaluminum chloride and the Fe2+ in FWSG also can be removed. The function mechanism of DTC-TETA was investigated through the studies of zeta potential change of suspended solids and structural characteristics of flocs. The results confirmed that the flocs were developed by the network formed by the coordination reaction between DTC-TETA and Fe2+, which can filter out suspended solids. This study signifies that both suspended solids and Fe2+ ion can be removed by using DTC-TETA as flocculant, which is a new choice for the FWSG treatment.
研究领域:
环境科学
·
化学工程
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xindan Li,Ming Yin,Xincheng Cai,Zhuoying Jia,Hongjiang He,Mingjing Tang,Xiaoqiang Li,Shengquan Yu
Polycrystalline MgF 2 is an attractive mid-infrared laser host material, yet its widespread application in high-power systems is limited by its inferior thermal conductivity compared to single-crystal materials, resulting in inefficient heat dissipation. To address this challenge, we successfully designed and synthesized Fe 2+ : MgF 2 transparent ceramics using a strategic wet chemical coprecipitation method combined with hot-press sintering. This method enables precise Fe 2+ doping within the MgF 2 lattice (Fe x Mg 1-x F 2 , 0.0002≤x ≤ 0.05), with doping effects clearly confirmed by XRD, XPS, and TEM analyses. The resulting ceramics exhibit outstanding mid-infrared transmission properties, with 1-mm-thick samples achieving 90% linear transmittance at 5.7 μm wavelength. More importantly, Fe 2+ incorporation significantly enhances thermal conductivity—peaking at 20.3 W/(m·K), a substantial increase over the baseline value of 11.6 W/(m·K)—while simultaneously raising Vickers hardness to 5.49 ± 0.54 GPa, fulfilling the core design objective. This simultaneous achievement of high optical quality and exceptional thermal management demonstrates that Fe 2+ : MgF 2 transparent ceramics represent a highly promising and reliable candidate material for high-power mid-infrared laser applications.
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Gels
·
2026
·Vol. 12
·期 9
·835
·
IF 6.4
Nan Jiang,Guomin Ding,Bowen Yang,Shuai Liu,Luyao Wang,Zihan Li,Xu Han,Qilin Mei
Laser-induced graphene (LIG) has great potential for multiple applications because of its large specific surface area, facile fabrication process, and tunable properties. However, abundant lattice defects severely degrade its conductivity. Herein, from an innovative perspective of precursor design, the poly-phenylamines (P-PAs) with improved solubility and strong light absorption were synthesized, which act as an intercalated polymer for graphene oxide (GO) nanosheets. On this basis, the composite precursors show remarkably enhanced photothermal conversion capability and a compact stacked structure. These bring a 60% reduction in ID/IGin LIG after laser irradiation. To explain the above phenomenon, an isolation effect induced by the compact stacking precursor is proposed based on experimental results. Furthermore, the cooperative effect between P-PAs and Fe2+is introduced, and a fluffy LIG aerogel with the lowest ID/IGratio of 0.17 is prepared, which is barely achievable in conventional LIGs. When the obtained graphene aerogel is compounded with PDMS, the as-prepared thermal-conductive composite gel reaches a thermal conductivity of 1.05 W·m−1·K−1and an ultralow interfacial thermal resistance of 37.2 mm2·K·W−1under a low graphene loading of 3.3 wt%. This intercalation strategy in GO precursor supplies a new route for preparing high-quality LIGs and thermal-conductive gels, which show great application prospects in thermal management devices.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Haoyi Xu,Xiaoning Deng,Ying Zhang,Yuwei Pan
Chelating agents significantly enhanced SDZ degradation in UV/Fe 2+ /H₂O₂ system. • The CA-enhanced systems operate efficiently across pH 3–8. • OH was the dominant reactive species, O₂· − and 1 O₂ played minor roles in SDZ removal. • Degradation pathways produced intermediates with lower toxicity than SDZ. • The system showed broad-spectrum reactivity and stability in natural freshwater. Antibiotics, widely detected in aquatic environments, pose significant threats to ecosystems and human health due to their recalcitrance in conventional wastewater treatment processes. This study systematically investigated the enhancement effects and mechanisms of three chelating agents (CAs) including NTA, EDTA and EDDS on sulfadiazine (SDZ) degradation in the UV/Fe 2+ /H₂O₂ system. Results showed that CAs significantly improved SDZ removal efficiency by complexing iron ions, promoting Fe 2+ /Fe 3+ cycling thereby enhancing photo-induced Fenton reactions. The NTA/UV/Fe 2+ /H₂O₂ system exhibited the highest performance, achieving 90.5% SDZ removal within 20 min, followed by EDTA (90.1%) and EDDS (88.7%) and without CAs (<35%). The CAs/UV/Fe 2+ /H₂O₂ system maintained high efficiency over a broad pH range (3–8), overcoming the pH limitation of traditional UV-Fenton processes. Electron paramagnetic resonance (EPR) and quenching experiments confirmed ·OH was the dominant reactive oxygen species and O₂· − and 1 O₂ also played minor roles. Degradation pathways of SDZ included ·OH oxidation, S N bond cleavage, and ring-opening reactions, producing intermediates with lower toxicity than SDZ. Meanwhile, the CAs/UV/Fe 2+ /H₂O₂ system could effectively remove various antibiotics (e.g., sulfamethoxazole, tetracycline) and maintain stability in the presence of inorganic anions and humic acid. Moreover, the CAs/UV/Fe 2+ /H₂O₂ system performed well in natural fresh water matrices, highlighting its practical application potential for antibiotic-contaminated water treatment. Download: Download high-res image (100KB) Download: Download full-size image
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高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Wenshuai Jiang,Jin Yang,Yaning Wang,Yiyang Gao,Wu Ren,Yi Yu,Qingjun Liu
An efficient and sustainable dye wastewater degradation system is designed by using Fe 2+ -modified graphene oxide/MXenes (GO/MX-Fe 2+ ) composites. Experimental results demonstrated that the GO/MX-Fe 2+ composites acted as an efficient catalyst for Fenton-like reaction; moreover, they functioned as an adsorbent to remove dyes and heavy metal ions from wastewater, enhancing the degradation rate and overall purification performance. Furthermore, the study partially confirmed that the ferrous ions involved in the reaction originate from the cross-linking process during hydrothermal synthesis, rather than adsorption. By controlling the dosage of Fe 2+ , efficient degradation can be achieved while inhibiting the formation of iron sludge. Notably, the system generated a small amount of non-iron byproducts during methylene blue (MB) treatment and almost none in the degradation of other dyes, reflecting its wide applicability. The reaction pH adaptability broadened from acidic to mildly alkaline conditions. The rate of MB within 1 h reached more than 95 %, and the GO/MX-Fe 2+ composites exhibited good recyclability. This study demonstrated that due to their straightforward preparation, superior performance and minimal secondary pollution, the GO/MX-Fe 2+ composites are an example of an efficient and sustainable approach for the design of composite materials for dye degradation and environmental remediation.
研究领域:
环境科学
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材料科学
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化学工程
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纳米技术
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高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Jiayi Zhang,Suting Weng,Cong Zhong,Jiacheng Zhu,Yan Liu,Qiu Fang,Hao Zhang,Yejing Li,Xuefeng Wang
The detrimental effects of Fe-ion crosstalk on LiFePO 4 ||Graphite battery performance, coupled with limited mechanistic insights into solid electrolyte interphase (SEI) evolution under such interference, warrant systematic investigation. Herein, advanced characterization techniques—including X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry, and cryogenic transmission electron microscopy—are employed to reveal SEI evolution on graphite anodes under Fe 2+ /Fe 3+ influence. Results demonstrate that Fe 3+ exerts more severe adverse effects than Fe 2+ . Specifically, Fe 2+ primarily promotes conventional electrolyte reduction reactions, increasing H 2 , CH 4 , and CO 2 generation. In contrast, Fe 3+ facilitates radical combinations and catalyzes two-electron reductions, triggering side reactions releasing CO, C 2 H 4 , and C 2 H 6 . The SEI thickness under Fe-ion interference (Fe 2+ : 7.20–13.76 nm, Fe 3+ : 9.12–17.55 nm) significantly exceeds that of the base electrolyte (3.15–7.64 nm), with Fe deposits accumulating in organometallic forms. Critically, the presence of Fe 3+ and its adverse impacts on battery safety and cycling stability are validated in practical pouch cells. This study uncovers the chemical nature of the dissolved Fe ion and its deposits, provides mechanistic insights into its interference with SEI properties and Li-ion battery performances, which in turn helps to mitigate such detrimental effects.
研究领域:
电化学
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材料科学
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能源存储
·
电池技术
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界面化学
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应用化学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Dongliang Wang,Yuxiao Li,Shaogang Hu,Jingping Hu,Huijie Hou,Bingchuan Liu,Han Zheng,Xi Luo,Haixiao Li
Electro-Fenton (EF) has shown great advantages in the effecient degradation of recalcitrant organic pollutants through in situ generation of •OH, and the main limitations on system performance are the efficiencies of H 2 O 2 activation and Fe 2+ regeneration. In this research, a triple-cathode EF system with a microbial fuel cell (MFC) cathode for the acceleration of Fe 2+ regeneration, a gas diffusion electrode for H 2 O 2 production and a stainless steel mesh (SSM) for electro-activation of H 2 O 2 was designed for efficient degradation of organic pollutants. The triple-cathode EF exhibited improved removal rate for recalcitrant organic pollutants with an average electricity consumption of 18.2 kWh Kg −1 TOC for Rhodamine B degradation, and the dosage of Fe 2+ could be reduced to 0.1 mM due to better utilization of H 2 O 2 and inhibition of parasitic reactions. Electrochemical characterization and theoretical calculation revealed that both one-electron reduction and H*-mediated activation contributed to the electro-activation of H 2 O 2 on SSM. This work demonstrates a novel construction and feasible approach for efficient EF with low cost.
研究领域:
环境科学
·
电化学工程
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Bin Ou,Jixiao Wang,Ying Wu,Song Zhao,Zhi Wang
A new electrode for photoelectro-Fenton (PEF) process was fabricated by electrochemical deposition of g-C 3 N 4 on the surface of graphite felt (GF). The modified electrode was characterized by scanning electron microscope, contact angle, X-ray photoelectron spectroscopy, cyclic voltammetry and current-time curves, the morphology and surface physicochemical properties after the electrochemical modification were obviously changed. The g-C 3 N 4 /GF electrode shows good electrochemical performance such as an improvement of the redox current and exhibits great photocatalysis under the light irradiation compared to raw GF. This new electrode improved significantly the generation of hydrogen peroxide, which was confirmed by the cyclic voltammetry. The electrons transfer to the cathode through the external circuit and O 2 was reduced into H 2 O 2 , which was catalyzed by g-C 3 N 4 through two-electron process, and the produced H 2 O 2 was further reduced by the Fe 2+ to •OH. Additionally, the degradation of aniline was investigated by g-C 3 N 4 /GF electrodes in an undivided cell at pH = 3.0 under the visible light irradiation. After 10 cycles, the mineralization ratio was still above 91% using the modified electrode, demonstrating that the modification method could effectively improve the PEF and benefit its environmental applications.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Liang Ma,Minghua Zhou,Gengbo Ren,Weilu Yang,Liang Liang
A highly energy-efficient flow-through Electro-Fenton (E-Fenton) reactor for oxidation of methylene blue (MB) from aqueous solution was designed using a perforated DSA as anode and the graphite felt modified by carbon black and polytetrafluoroethylene (PTFE) as cathode for the in situ generation of H 2 O 2 . The modified cathode had a high H 2 O 2 production with low energy consumption, which was characterized by scanning electron microscopy (SEM), nitrogen adsorption-desorption study and contact angle. The flow-through E-Fenton system was compared to the flow-by and regular one, and confirmed to be best on MB removal and TOC degradation. The operational parameters such as current density, pH, Fe 2+ concentration and flow rate were optimized. The MB and TOC removal efficiency of the effluents could keep above 90% and 50%, respectively, and the energy consumption was 23.0 kWh/kgTOC at the current density of 50 mA, pH 3, 0.3 mM Fe 2+ , and the flow rate of 7 mL/min. OH was proved to be the main oxidizing species in this system. After 5 times operation, the system, especially cathode, still showed good stability. Five more organic pollutants including orange II (OG), tartrazine, acetylsalicylic acid (ASA), tetracycline (TC) and 2,4-dichlorophen (2,4-DCP) were investigated and the electric energy consumption (EEC) was compared with literatures. All results demonstrated that this flow-through E-Fenton system was energy-efficient and potential for degradation of organic pollutants.
研究领域:
环境工程
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化学工程
·
水处理
·
污染物降解
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2016
·
IF 3.847
Xinping Ouyang,Tao Ruan,Xueqing Qiu
Lignin was hydrothermal oxidation depolymerized by using H 2 O 2 as the oxidant and CuO/Fe 2 (SO 4 ) 3 /NaOH as catalysts. The effect of the solvents, including water, methanol, 1,4-dioxane, tetrahydrofuran , ethanol, and their co-solvent, on the depolymerization of lignin were investigated. It is found that the yield of monophenolic compounds reaches 17.92% by using 1:1 (v/v) of methanol/water as the reaction medium. The suitable proportion of methanol to water not only effectively maintains the alkalinity of the reaction medium and the solubility of lignin, but also suppresses the demethoxylation during the process of depolymerization reaction, resulting in an increase of contents of syringyl style monophenolic compounds which prevents the re-polymerization. Consequently, the yield of monophenolic compounds is increased.
研究领域:
化学工程
·
有机化学
·
可再生能源
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高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Zhu Wen-Yuan,Niu Kun,Liu Peng,Fan Yu-Hang,Liu Zhi-Qiang,Zheng Yu-Guo
L-methionine is an important natural amino acid with broad application prospects. A novel gene encoding the enzyme with the ability to catalyze O-succinyl-L-homoserine (OSH) to L-methionine was screened and characterized. The recombinant O-succinyl-L-homoserine sulfhydrylase from Thioalkalivibrio sulfidiphilus (tsOSHS) exhibited maximum activity at 35°C and pH 6.5. OSHS displayed an excellent thermostability with a half-life of 21.72 h at 30°C. Furthermore, the activity of OSHS increased 115% after Fe2+ added. L-methionine was obtained with a total yield reaching 42.63 g/L under the concentration of O-succinyl-L-homoserine 400 mM (87.6 g/L). These results indicated that OSHS is a potential candidate for applying in the large-scale bioproduction of L-methionine.
研究领域:
生物化学
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微生物学
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生物技术
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 13
·期 6
·120382
·
IF 7.2
Xiaoxue Pan,Yanan Wen,Le Tao,Jinli Qiu,Yuchen Jin,Xianqiu Zhang,Xuesheng Zhang
While the co-exposure toxicity of neonicotinoids (NENIs) and their synergists has attracted attention, it is of high demand to establish effective methods for achieving their co-removal under real environmental conditions. In this study, a magnetically recoverable Fe 3 S 4 catalyst was synthesized via a facile hydrothermal route and employed to activate H 2 O 2 for the simultaneous removal of thiamethoxam (THM) and piperonyl butoxide (PBO). The system demonstrated high co-removal efficiency of THM and PBO under optimized conditions. Although co-existence of PBO significantly suppressed THM removal in comparison to single system, complete removal of THM (in 5 h) and PBO (in 1 h) was still achieved. Notably, co-existence of humic acid and inorganic anions, and change in water matrix displayed negligible influence on the reaction process, with removal efficiencies remaining above 80 %. Mechanism investigations through quenching tests and electron paramagnetic resonance (EPR) verified that hydroxyl radicals (•OH) served as the primary reactive species, contributing almost 100 % to THM degradation. In contrast, PBO removal occurred via a dual pathway involving •OH oxidation and surface adsorption. X-ray photoelectron spectroscopy (XPS) analysis of Fe 3 S 4 before and after reaction further revealed the pivotal role of surface sulfur species in accelerating Fe 3+ /Fe 2+ cycle and facilitating sustained H 2 O 2 activation. •OH oxidized THM and PBO via four routes: denitration, cleavage C-C or C-N bond, ring opening, and hydroxylation. These findings provide remarkable insights for the remediation of water containing mixed pesticide pollutants.
研究领域:
环境科学
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水处理
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高级氧化技术
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污染物降解
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催化
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高影响因子
危险品化学品经营许可证（带存储）