Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yujia Tong,Chenxuan Shao,Jinbo Chen,Fiona Hammond Quarcoo,Changqing Miao,Xiaohui Ju,Weixing Li
High hydrophobicity of polyvinylidene fluoride (PVDF) membrane surface results in adsorption of oil droplets and membrane fouling . A hydrogel coating with crosslinking network of polyvinyl alcohol (PVA), pyrogallol (PG) and Fe(III) based on PVDF membrane was proposed. Hydrogen bonds between PVA and PG in water were regulated by ethanol to form a uniform hydrophilic hydrogel coating on PVDF membrane. Chelation between PG and Fe 3+ significantly enhanced hydrogel adhesion. The surface energy of the developed PVDF-PVA/PG-Fe 3+ membrane was 39.96 mJ·m −2 , 2.71 times that of the pristine PVDF membrane, while its adhesion to oil is close to 0 μN. The permeate flux reached 1341 L·m −2 · h −1 at 0.1 bar for separating isooctane-in-water emulsions with good separation efficiency (>99 %) and cycling stability. The developed membrane could also effectively separate petroleum ether-in-water and dodecane-in-water emulsions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xin Yang,Lu Yao,Yu Wang,Xinran Zhang,Pengfei Ren
Algae blooms can clog filtration tank, release toxic cyanotoxin and produce undesirable disinfection byproducts (DBPs) in post-chlorination, which brings challenges to conventional water treatment processes. In this study, peroxymonosulfate (PMS) was tested for its ability to improve Fe(III) coagulation of Microcystis aeruginosa in water treatment. Compared with conventional Fe(III) coagulation, the presence of PMS resulted in the formation of larger floc and thus better algae and turbidity removal. The removal of algae by PMS-enhanced Fe(III) coagulation (PMS-Fe(III)) process reached 97.5% at 1 mM PMS, which was 1.5 times higher than that by Fe(III) coagulation alone. The oxidization of surface-adsorbed extracellular organic matter destabilized the algal cells and enhanced their coagulation without greatly damaging the cells’ integrity. Simultaneously, about 80% of Microcystin-LR, a cyanotoxin, was degraded in the enhanced process. Moreover, the formation of DBPs and their associated toxicity during the subsequent chlorination were decreased by 49.2% and 13.6%, respectively. The production of trihalomethanes, haloacetic acids and haloacetronitriles was particularly abated. SO 4 •- and HO • , which were formed from PMS activation through redox cycling of Fe mediated by the existing natural organic matter, were mainly responsible for algae removal. The results indicate that supplementing Fe(III) coagulation with PMS is a promising option for treating water during algal blooms.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Li Yang,Wei-Hua Zhang,Yan Li,Yan-Li An,Ye-Ming Wu,Ning Gu,Gao-Jun Teng
Noninvasive therapies such as photodynamic therapy (PDT) and chemodynamic therapy (CDT), which rely on reactive oxygen species (ROS), are gaining attention for their low toxicity. However, single-modal treatments have individual limitations that restrict the therapeutic efficacy. Fe(III) can coordinate with the hydrophilic regions of indocyanine green (ICG) molecules to form the ICG/Fe(III) complex, making it a promising dual-modal agent for combined PDT and CDT. However, coordination with Fe(III) leads to the aggregation quenching of ICG, hindering its application in dual-modal therapy. We innovatively utilize oxygen nanobubbles, prepared solely from water and oxygen, to significantly reverse the aggregation-induced quenching of the ICG/Fe(III) complex, thereby enhancing its stability in aqueous environments. In this system, Fe(III) assembles at the nanobubble interface, coordinating with ICG’s hydrophilic regions to form the ICG/Fe(III)-NBs. The oxygen nanobubbles boost PDT efficiency by improving the ICG/Fe(III) complex stability and oxygen content, while Fe(III) achieves CDT by generating hydroxyl radicals (•OH) through the Fenton reaction. This dual-modality treatment significantly disrupts the tumor’s redox balance, induces ferroptosis, and demonstrates strong antitumor efficacy, reducing tumor volume to 34% of its initial size in mice. The strategy offers a promising and clinically viable approach to cancer treatment.
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高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Shuang Meng,Peng Zhou,Yiming Sun,Peng Zhang,Chenying Zhou,Zhaokun Xiong,Heng Zhang,Juan Liang,Bo Lai
Reduction of Fe(III) is the rate-limiting step of iron induced Fenton-like systems, such as the iron/peroxydisulfate system, reducing agents (RAs) were frequently employed as electron donors to directly reduce Fe(III) to further promote the formation of reactive oxygen species (ROS), mainly including hydroxyl radical ( • OH), sulfate radical (SO 4 •− ), and ferryl ion (Fe(IV)). However, the intrinsic distinctions among these ROS cause the substrate specific reactivity towards oxidation of diverse organic contaminants. In this study, various RAs (representative solid amorphous boron (A-Boron) and dissolved hydroxylamine (HA)) were added to enhance the Fe(III)/PDS system for investigating the substrate specific reactivity of ROS. It is demonstrated that RAs remarkably boost the Fe(III)/Fe(II) cycles to produce • OH, SO 4 •− , and Fe(IV) in the RAs/Fe(III)/PDS systems, based on the results of EPR analysis, quenching tests, and chemical probe analysis. Furthermore, the different yields of methyl phenyl sulfone (PMSO 2 ) indicate that the distribution of multiple oxidizing species changed with various factors (i.e., type and dosage of RAs added, solution pH, Fe(III) and PDS dosage). This work provides the possibility for the adjustment of oxidation selectivity of RAs/Fe(III)/PDS systems by regulating contribution of radicals and non-radical for oxidizing organic contaminants due to the substrate specific reactivity of • OH, SO 4 •− , and Fe(IV), moreover, the comparison of homogeneous and heterogeneous RAs provides assistance in the application of RAs for environmental remediation.
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高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Zhuoyao Fang,Zhixian Li,Xiaolin Zhang,Siyuan Pan,Mengfei Wu,Bingcai Pan
The efficient removal of arsenite [As(III)] from groundwater remains a great challenge. Nanoscale oxides of Fe(III), Zr(IV), and Al(III) can selectively remove arsenic from groundwater through inner-sphere complexation. However, owing to polysilicate coatings formation on nanoparticles surface, the ubiquitous silicate exerts remarkably adverse effects on As(III) removal. Herein, we propose a new strategy to enhance silicate resistance of nanoscale oxides by embedding them inside the redox polymer host. As a proof-of-concept, the nanocomposite HFO@PS-Cl was employed to remove As(III) from silicate-containing water. The polymer host (PS-Cl) contains active chlorine to oxidize As(III) into arsenate [As(V)], and the embedded Fe(III) oxides enabling specific adsorption toward arsenic. Silicate exerts negligible effects on As(III) removal by HFO@PS-Cl in pH 3-7, but increasing the residual arsenic concentration from 49 µg/L to 166 µg/L for the solutions treated by HFO@PS-N, i.e. , the nanoscale Fe(III) oxides embedded inside the polymer host without active chlorine. During the six cyclic decontamination-regeneration assays, HFO@PS-Cl steadily reduces As(III) below 10 µg/L. As for HFO@PS-N, however, the residual arsenic increases to ~57 µg/L in the sixth run. In column mode, HFO@PS-Cl column generates >3200-bed volume (BV) clean water ([As]<10 µg/L) from the simulated As(III)-contaminated groundwater. In contrast, the values for As(V)-contaminated water and HFO@PS-N column are only ~650 BV and ~608 BV, respectively. The stoichiometric assays, XPS , and in-situ ATR-FTIR analysis demonstrate that silicate polymerization is intensively suppressed by the protons produced during As(III) oxidation, thus rendering HFO@PS-Cl with excellent silicate resistant properties.
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高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Qianqian Chang,Boqiang Gao,Hu Yang
In this work, a series of novel composite adsorbents (k-TAFe) was designed and fabricated through a one-step method, that is, the chelation crosslinking of tannic acid, kaolin particles and different contents of Fe(III). k-TAFe had a high efficiency in adsorption of various fluoroquinolones antibiotics (FQs) from water. The detailed performance of k-TAFe in FQs adsorption, including the influences of Fe(III) content, solution pH, inorganic and organic additives, adsorption time and FQs' concentration, has been investigated systematically using ofloxacin (OFL), one of popular FQs, as an example. The maximal OFL uptake of k-TAFe was 0.405 mmol/g at an initial pH of 6.0. On the basis of the analysis of the x-ray photoelectron and fourier transform-infrared spectra before and after adsorption, the comparison in the apparent performance of k-TAFe in adsorption of seven FQs with similar structures and their two sub-structural analogs, and theoretical calculation, multiple adsorption mechanisms, including chelating effect, hydrogen bonding, electrostatic attraction , and π-π electron–donor–acceptor interactions, were involved and discussed in detail. Among them, chelating effect due to Fe(III) played a key role in OFL adsorption, and the addition of kaolin particles synergistically enhanced Fe(III) fixed on the composite adsorbents, increased the Fe(III) contents, and caused an improved OFL uptake of k-TAFe. Because of the evident advantages of environmental-friendliness, high adsorption performance and low cost, k-TAFe as an efficient adsorbent has notable application potentials in removal of FQs from water.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 1
·309-318
·
IF 2.606
Yu Yong,Shang Zhichao,Yang Zhongxiang,Wang Xiaohong,Feng Peizhong
The Fe(III)-doped BiOCl catalyst was successfully prepared via a one-step solution combustion synthesis (SCS), and they were characterized by XRD, FESEM, HRTEM, XPS, PL and DRS analysis. With the doping of Fe(III), the SCS catalysts become finer and more uniform, and show narrowed bandgap, which makes the Fe(III)-BiOCl can be excited to form photogenerated electrons and holes under visible light irritation and improve the photocatalytic performance. Compared with the SCS BiOCl, the FB1-2 sample exhibits doubled surface area (9.62 m 2 /g), narrowed bandgap (1.35 eV) and quadrupling degrading efficiency for Rhodamine B (RhB) (93% at 60 min). In addition, through the capturing of free radicals, the photocatalytic degradation mechanism of RhB was proposed, in which the active substances ∙O 2 − and h + played a leading role in the degradation process. Owing to the novel one-step combustion process and resulting in excellent photocatalytic performance, the Fe(III) doping BiOCl is demonstrated as a prospective catalyst for degrading dye pollutants.
Graphical abstract
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高影响因子
DYES AND PIGMENTS
·
2019
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IF 4.018
Yingting Zheng,Hailong Wang,Jianzhuang Jiang
A fluorescent porous tetraphenylethylene-based organic polymer ( PTOP ) was constructed by the reaction of 5,5',5'',5‴-(ethene-1,1,2,2-tetrayltetrakis(benzene-4,1-diyl))tetrakis(pyrimidin-2-amine) and cyanuric chloride in the presence of potassium carbonate. CO 2 sorption experiment at 195 K reveals the permanent porosity of PTOP with a Brunauer-Emmett-Teller surface area of 227 m 2 g −1 . In particular, the existence of rich secondary amines and pyrimidine nitrogen atoms surrounding the 1,3,5-triazine moieties in PTOP provides abundant chelating sites for metal ions, endowing a fast-response and sensitive fluorescence sensing Fe(III) with a low limit of detection of 4.5 μM. In addition, this polymer also shows an excellent sensing performance towards nitrobenzene with good selectivity and a low detection limit of 1.6 nM.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 21
·8952-8959
·
IF 3.288
Hehe Qin,Jinhong Fan,Shun Mao
The Fenton method is an important water treatment process. However, the mechanism of the Fenton reaction is still not widely recognized. In this article, the autocatalysis process responsible for the degradation of 4-chlorophenol (4-CP) as well as the generation of Fe(II) and the decomposition of H2O2 is elaborated using a Fe(III)/H2O2 system. It was found that the one electron reduction of Fe(III) to Fe(II) via oxidization of H2O2 to ˙HO2 is not spontaneous according to the standard electrode potential rather than being limited by the rate constant of 0.0027 M−1 s−1 in view of the Haber–Weiss circulation. However, the reaction of Fe(III) and 4-CP is spontaneous with a second-order kinetic rate constant of >0.12 M−1 s−1 and a conversion rate of 0.56%, which triggers the switch of the Fenton-like reaction as a real rate-determining step. The circulation of Fe(III) to Fe(II) in the proposed Fenton-like reaction mechanism depends on the organic species and various intermediates, which indicates its reaction selectivity, preferable for organics with a stronger thermodynamic and kinetic activity. Besides, a slight pH decline with time-scale and the stoichiometric ratio of ˙OH to H2O2 and H2O2 to 4-CP being 1 and 2, respectively, pointed to the new proposed reaction mechanism. The discovery of the new reaction mechanism might promote the theoretical and technical advancement of the Fenton-like process.
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Foods
·
2025
·Vol. 14
·期 8
·1290
·
IF 5.1
Ziyi You,Yushan Chen,Wendi Teng,Ying Wang,Yuemei Zhang,Jinxuan Cao,Jinpeng Wang
Phenolic acids have a positive effect on the processing quality of myofibrillar protein (MP) gels. However, in this study, the addition of ferulic acid (FA) did not have a positive effect on MP gels. To address this issue, we performed the addition and observed the effects on the structure of MP gels by both surface coating and internal cross-linking: addition of FA alone, addition of α-cyclodextrin (CD) to encapsulate FA (MP-FA/CD), and addition of Fe(III) to form a metal–phenolic network structure (Fe @MP-FA) and a metal–cyclodextrin–phenolic acid structure (Fe@MP-FA /CD). It was found that both Fe @MP-FA formed by surface coating and internal cross-linking were able to improve the textural properties of MP gels, including hardness, elasticity, chewability, adhesion, etc. FA effectively promoted the conversion of some of the non-fluidizable water to the bound water morphology, and the addition of Fe(III) effectively enhanced this trend. In particular, the composite network structure formed by Fe@MP-FA/CD more significantly promoted the conversion to bound water and improved the water retention of the gel. Hydrophobic interactions and hydrogen bonding in non-covalent bonding as well as disulfide bonding in covalent bonding were always the main factors promoting the formation of gels from MP after different additions. Meanwhile, different gel treatments lead to changes in the structure of different proteins. Internal cross-linking with the addition of FA promotes protein oxidation, whereas CD reduces the occurrence of oxidation and promotes a homogeneous gel structure. Surface coating with the addition of FA/CD resulted in a reduction in pores in the MP gels and a denser gel structure. However, the addition of internal cross-linking resulted in a gel with a loose and rough network structure. In this study, we compared the common methods of gel enhancement, with the objective of providing a reference for the improvement in the gel texture of meat products.
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高影响因子
CHEMICAL GEOLOGY
·
2025
·
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.
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WATER RESEARCH
·
2014
·
IF 5.323
Jingu Shi,Zhihui Ai,Lizhi Zhang
In this study we demonstrate Fe@Fe 2 O 3 core–shell nanowires can improve Fenton oxidation efficiency by two times with rhodamine B as a model pollutant at pH > 4. Active species trapping experiments revealed that the rhodamine B oxidation enhancement was attributed to molecular oxygen activation induced by Fe@Fe 2 O 3 core–shell nanowires. The molecular oxygen activation process could generate superoxide radicals to assist iron core for the reduction of ferric ions to accelerate the Fe(III)/Fe(II) cycles, which favored the H 2 O 2 decomposition to produce more hydroxyl radicals for the rhodamine B oxidation. The combination of Fe@Fe 2 O 3 core–shell nanowires and ferrous ions (Fe@Fe 2 O 3 /Fe 2+ ) offered a superior Fenton catalyst to decompose H 2 O 2 for producing OH. We employed benzoic acid as a probe reagent to check the generation of OH and found the OH generation rate of Fe@Fe 2 O 3 /Fe 2+ was 2–4 orders of magnitude larger than those of commonly used iron based Fenton catalysts and 38 times that of Fe 2+ . The reusability and the stability of Fe@Fe 2 O 3 core–shell nanowires were studied. Total organic carbon and ion chromatography analyses revealed the mineralization of rhodamine B and the releasing of nitrate ions. Gas chromatograph-mass spectrometry was used to investigate the degradation intermediates to propose the possible rhodamine B Fenton oxidation pathway in the presence of Fe@Fe 2 O 3 nanowires. This study not only provides a new Fenton oxidation system for pollutant control, but also widen the application of molecular oxygen activation induced by nanoscale zero valent iron .
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