SEPARATION SCIENCE AND TECHNOLOGY
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2021
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IF 2.475
Xuekai Zhang,Kanggen Zhou,Qingyuan Lei,Yan Xing,Changhong Peng,Wei Chen
A new approach was developed using NaH2PO4 as the stripping agent for Fe stripping from Fe-loaded Aliquat 336 during rare-earth elements recovery from red mud leachate. Owing to the strong coordination between Fe3+ and H2PO4‒, Fe mainly exists as FeH2PO42+ at [H2PO4‒] higher than 0.5 M, which can be readily stripped. The results showed a maximum Fe stripping efficiency of 95.5% under optimal condition. Moreover, the extraction capacity of the extractant after stripping was comparable to that of fresh extractant, and decreased only by 2% after 6 cycles, indicating the robustness of this approach for Fe stripping and extractant regeneration.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
Chemosensors
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2021
·Vol. 9
·期 3
·48
·
IF 3.398
Wei Wang,Hongren Zhao,Bing Zhao,Huimin Liu,Qinglei Liu,Yan Gao
In this paper, a novelNL-Fe3+ensemble was designed as a fluorescent chemosensor for highly selective detection of pyrophosphate (PPi) in DMSO/H2O (2:8/v:v, pH = 7.2) solution and living cells.NLshowed a strong affinity for Fe3+and was accompanied by obvious fluorescence quenching. Upon the addition of PPi to the generatedNL-Fe3+ensemble, the fluorescence and absorption spectra were recovered completely. Spectroscopic investigation showed that the interference provoked by common anions such as adenosine-triphosphate (ATP), adenosine diphosphate (ADP), and phosphates (Pi) can be ignored. The detection limit ofNL-Fe3+to PPi was calculated to be 1.45 × 10−8M. Intracellular imaging showed thatNL-Fe3+has good membrane permeability and could be used for the detection of PPi in living cells. A B3LYP/6-31G(d,p) basis set was used to optimizeNLandNL-Fe3+complex.Keywords:coumarin;Fe(III);pyrophosphate;cells imaging
研究领域:
生物化学
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分析化学
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细胞生物学
✓ 已验证
DOI
高影响因子
CHEMICAL GEOLOGY
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2025
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IF 3.6
FengTing Wu,ChunYan Luo,YueHan Lu,XueYan Li,KuanYi Li,YingXun Du
The co-precipitation of dissolved organic matter (DOM) and phosphate with Fe(III) at the sediment-water interface plays a crucial role in the biogeochemical cycling of organic carbon (OC) and phosphate (P) in aquatic ecosystems. The fluxes of organic matter and phosphate may occur in a sequential manner. This study investigated how phosphate affected pre-equilibrated Fe(III)-humic acid (HA) co-precipitates and how HA influenced pre-equilibrated Fe(III)-phosphate co-precipitates under varying pH and Fe(III) concentrations. The results revealed that the addition of phosphate to the Fe-HA co-precipitation system generally promoted further precipitation of dissolved Fe(III) with phosphate, resulting in about 9.48–33.15 % of the phosphate being precipitated. This addition had minimal impact on the percentage of pre-immobilized HA but facilitated the release of high-aromaticity HA from the Fe-HA co-precipitate. Conversely, adding HA to the Fe P co-precipitation system increased the concentrations of soluble Fe(III) and phosphate, likely due to the strong complexation ability of HA with Fe(III). The percentage of HA remaining dissolved was lower at lower pH levels and higher initial Fe(III) concentrations. These findings highlight how the timing of phosphate or DOM inputs influences their sequestration. This has important implications for carbon and nutrient storage in aquatic sediments, where fluxes of organic carbon and phosphate may occur in a sequential manner.
研究领域:
环境科学
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生物地球化学
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产品关联
DOI
高影响因子
CHEMOSPHERE
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2017
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IF 4.208
Ivan P. Pozdnyakov,Tamara E. Romanova,Xiaojiao Cai,Victoria A. Salomatova,Victor F. Plyusnin,Ping Na,Olga V. Shuvaeva
Photooxidation of As(III) in ternary As(III) – Fe(III) – Fulvic acid system at pH 4 was investigated by optical spectroscopy, steady-state photolysis (365 nm) and atomic-emission spectrometry with inductively coupled plasma techniques. It was found that at all values of [FA]/[Fe] ratio the main photoactive species is OH radical formed by photolysis of Fe(III) hydroxocomplexes. Addition of fulvic acid leads to mainly negative effect on As(III) photooxidation due to the following reasons: (i) slow dark reduction of photoactive Fe(III) species with formation of scattering particles and photoinert Fe(II) species; (ii) formation of photoreductive Fe(III)-FA complexes incapable to oxidize As(III), (iii) competition of both FA and Fe(III)-FA complexes for UVA quanta with FeOH 2+ complex and for OH radicals with As(III). Aging of ternary system is also very important parameter leading to one order decrease of quantum yields of both Fe(II) formation and As(III) photooxidation.
研究领域:
环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL LETTERS
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2023
·
IF 2
Yongzheng Yin,Huanhuan Lu,Weijun Song,Xiaofeng Hu,Chunyan Sun
Carbon quantum dots (CQDs) were derived from saponin and introduced into polyacrylamide hydrogel to prepare a novel bifunctional material (CQDs@HG). This hydrogel emitted strong blue fluorescence under ultraviolet light (365 nm) and exhibited stable adsorption and detection of iron(III) in water samples. The morphological characteristics, chemical composition, Fe3+ adsorption performance, and optical properties of CQDs@HG were characterized. Depending upon the Fe3+ concentration, CQDs@HG exhibited different quenching effects to allow Fe3+ determination. The limit of detection was 0.115 μM, and the adsorption was as high as 12.13 mg/g. The mechanism was due to both static and dynamic quenching. Notably, the sensor based on CQDs@HG successfully determined Fe3+ in water samples, with spiked recoveries between 95.32% and 103.11%. When combined with software image analysis, the sensor semi-quantitatively determined Fe3+ in the field. This fluorescent hydrogel provides a reference for constructing portable sensors for monitoring hazardous substances in water.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
LUMINESCENCE
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2016
·Vol. 31
·期 8
·1448-1455
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IF 1.452
Lingcan Kong,Keyu Lu,Guangyuan Ma,Yuyang Yao,Xia Ling,Wenwei Liu
One strong fluorescent Bodipy-containing derivative was synthesized and characterized using 1 H NMR, electrospray ionization mass spectrometry and elemental analysis. Its electrochemical and photophysical properties were investigated. In addition, the Bodipy derivative could be used as an on–off fluorescent probe for the detection of Fe 3 + ions based on the inner filter effect because the absorption band of the Fe 3 + ion overlaps the excitation band of Bodipy very well upon irradiation with UV light. Furthermore, the Bodipy-based sensor has obvious advantages including simplicity, rapid response, high selectivity, sensitivity and a detection limit of 1.2 μ mol/L, and has been demonstrated in real water samples including tap water, mineral water and water from Lake Tai. Moreover, the fluorescent probe could also be used as a probe for the determination of Fe 3 + in cellular and bacterial imaging. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
分析化学
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生物成像
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DOI
高影响因子
ACS Omega
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2018
·
IF 0
Yucui Hou,Zengqi Lin,Muge Niu,Shuhang Ren,Weize Wu
The conversion of abundant renewable cellulose into versatile formic acid (FA) is a potential process for efficient energy storage and application. Vanadium(V)-catalyzed oxidation with O2 in acidic aqueous media now is the most common method to realize the FA production from cellulose with both high yields and high purity. However, vanadium-based catalysts are difficult to synthesize and expensive. Thus, the seeking for cheaper catalysts with the same high efficiency is expected. In this work, after testing a variety of metal salts in acidic aqueous solution for the conversion of cellulose under O2, iron(III) was found as a cheaper and readily available catalyst for FA formation, with a comparable yield (51.2%, based on carbon) with that of vanadium(V). The effect of reaction parameters was studied. The competition between oxidation and hydrolysis was found and discussed in detail. FeCl3 and H2SO4 can accelerate oxidation and hydrolysis, respectively, whereas suppress the other. The effects can reflect on the product distribution. Intermediates were found and the pathway from cellulose to products was reasonably proposed. The reusability of the catalytic system shows good performance after four runs. The mechanism study suggests a catalytic ability by a mutual transformation between iron(III) and iron(II), where iron(III) oxidizes substrates to iron(II) that is reoxidized by O2.
研究领域:
化学
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能源科学
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催化科学
✓ 已验证
DOI
PubMed
CHEMICAL COMMUNICATIONS
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2011
·Vol. 48
·期 14
·2024-2026
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IF 5.787
Jian Gao,Qing-Wen Song,Liang-Nian He,Zhen-Zhen Yang,Xiao-Yong Dou
An iron(III)-catalyzed three-component coupling reaction of alkynes, CH2Cl2 and amines was developed for facile synthesis of propargylamines. Preliminary mechanism investigation using in situFT-IR reveals that the crucial Fe-acetylide intermediate could be formed through C–H bond activation of alkynes thanks to cooperative effect of FeCl3 and 1,1,3,3-tetramethylguanidine.
研究领域:
有机化学
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催化化学
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产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
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2018
·
IF 3.956
Ting Lu,Yucui Hou,Weize Wu,Muge Niu,Wei Li,Shuhang Ren
Carboxylic acids are considered as an important group of chemicals. Direct conversion of cellulose to formic acid (FA) by vanadium(V(V))-contained catalyst is of significant conceptual and practical interest. A second metal (from Mg(II), Ca(II), Al(III), Cr(III), Mo(VI), Mn(II), Cu(II), or Fe(III)) incorporated into V(V)-contained catalyst system was screened to further improve the oxidation of cellulose by O 2 to yield FA. Fe(III) exhibited the best performance and effects of reaction parameters on the conversion of cellulose in NaVO 3 -FeCl 3 -H 2 SO 4 aqueous solution were investigated. Cellulose could be rapidly converted, and the yield of FA (66.8%) was higher than that obtained by the single use of FeCl 3 (48.4%) or NaVO 3 (57.6%). The conversion of cellulose in another V(V)-contained catalyst system (H 5 PV 2 Mo 10 O 40 ) was explored to verify the universal enhancement of FeCl 3 . Influences of the second metal Fe(III) on the V(V)-contained catalyst system and mechanism of cellulose oxidation in the V(V)-Fe(III)-H 2 SO 4 system were studied. Compared with single use of V(V), the employment of Fe(III) alone is not active enough in the oxidative C C bond cleavage . V(V) other than Fe(III) is the main active species for selective oxidation of substrates. The incorporation of Fe(III) and V(V) shows both synergistic and competitive relationships. Both the synergistic and competitive effects are beneficial to increase FA yield, as they promote the oxidation of V(IV) to V(V), increase oxidative ability, and inhibit the overoxidation to by-product CO 2 . The catalyst system was reused four times without decline in activity.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
Royal Society Open Science
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2021
·Vol. 8
·期 8
·
IF 2.963
Lanxin Lu,Min Liu,Ying Chen,Ying Luo
The non-toxic and completely biodegradable cellulose within bamboo is one of the most abundant agricultural polysaccharide wastes worldwide, and can be processed into cellulose nanofibres (CNFs). Iron(III)-loaded CNFs (Fe(III)@CNFs) derived from bamboo were prepared to improve the adsorption of tetracycline (TC), chlortetracycline (CTC) and oxytetracycline (OTC) from an aqueous solution. The preparation conditions of Fe(III)@CNFs suitable for the simultaneous adsorption of three tetracycline antibiotics (TCs) were investigated. Various analyses proved the abundance of oxygen-containing functional groups and the existence of Fe(III) active metal sites in Fe(III)@CNFs. In batch experiments, Fe(III)@CNFs were applied under a wide pH range and the maximum adsorption capacities were 294.12, 232.56 and 500.00 mg g−1 (for TC, CTC and OTC, respectively). In addition, different concentrations and types of coexisting anions have a weak effect on TCs adsorption. The original TCs adsorption capacities of Fe(III)@CNFs remained stable (greater than 92%) after five cycles when UV + H2O2 was used as the regeneration method. Four adsorption mechanisms (surface complexation, hydrogen bonding, electrostatic interaction and van der Waals force) were obtained for the endothermic adsorption of TCs, among which surface complexation between Fe(III) and TCs always dominates. The practically applicable Fe(III)@CNFs adsorbents are promising for TCs enrichment and remediation in engineering applications.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Environmental Science-Water Research & Technology
·
2024
·
IF 3.5
Fan Bai,Zongping Wang,Guodong Wan,Lisan Cao,Yujie Cheng,Zhenbin Chen,Pengchao Xie
In this study, Fe(III)/sulfite (S(IV)) system was used to treat two actual water samples including a lake water sample and a secondary sedimentation tank effluent sample containing tribromophenol (TBP) with combined pre-oxidation and coagulation process. This process not only efficiently removed TBP but also facilitated the removal of background organic compounds. The treatment efficiency increased with the increased S(IV) addition times. The results from scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) showed that the in-situ generated flocs in the Fe(III)/S(IV) system exhibited enhanced specific surface area, adsorption capacity, and coagulation properties compared to those produced in single Fe(III) coagulation, with generating more Fe3O4 particles. The treatment efficiencies of TBP and background organic materials initially rose and then fell with an increase in S(IV) dosage. Moderately incrementing Fe(III) dosage also boosted the removal of TBP and background organic substances, whereas excessive Fe(III) dosage provided limited additional benefits. In the selected pH range of 3-8, good removal of turbidity could be always achieved, and the best removal of TBP and background organic substances was found at pH 4. Overall, this study indicated that the Fe(III)/S(IV) system with combined pre-oxidation and coagulation process would be an effective treatment strategy for aquatic organic micropollutants.
研究领域:
环境科学
·
水处理技术
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Suding Yan,Xinping Zhang,Hui Zhang
The combination of persulfate (PS) activation by iron ions with electrochemical process (electro/Fe 3+ /PS) is a promising advanced oxidation process. However, almost all these systems were performed in an unbuffered solution and actually under acidic pH condition, with the electricity being frequently supplied by external power. Considering the high buffering capacity of wastewater and energy saving, peroxydisulfate (PDS) activation by Fe(III) species with bioelectricity provided by microbial fuel cell (MFC) for bisphenol A (BPA) oxidation was investigated at fixed near-neutral pH as well as acidic pH. The results indicate that 90.8% of BPA could be removed at pH 2.5. Though the iron existed in the form of precipitate, BPA could still be efficiently removed at pH 6.0. The precipitate formed in the system at pH 6.0 was identified as the amorphous iron oxyhydroxides. Sulfate radicals in the bulk solution and that adsorbed on the precipitate were the dominant reactive species responsible for the oxidation of BPA in the homogeneous and heterogeneous MFC/Fe(III)/PDS processes, respectively. The mechanisms of BPA degradation at both pH values were proposed via EPR and quenching tests as well as XPS analysis. The effects of operating parameters, the mineralization, the mineralization current efficiency and energy consumption were also explored.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）