JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 103
·期 1
·309-318
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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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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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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Jing Feng,Gang Lang,Tingting Li,Jing Zhang,Tengyue Li,Zhenju Jiang
Heavy metals (HMs) pose serious threats to both human and environmental health and therefore, effective and low-cost techniques to remove HMs are urgently required. Here we report a facile Fe-tannin coating method for zero-valent iron (ZVI) including nanoparticles (nZVI) and foam (Fe foam ), and demonstrate that the generated Fe-tannin coating would remove the inherent passive iron oxide shell of ZVI and provide channels for the galvanic replacement reaction between ZVI and HM ions . Electrochemical characterizations demonstrate that the Fe core of the modified ZVI materials could be easily oxidized and transfer electrons to HM ions owing to the facile mass transport and charge transfer. In 40 min, nZVI@Fe-TA exhibits excellent performances for Cd(II), Ni(II), Pb(II), Hg(II), Cu(II) and Cr(VI) removal, with the apparent removal rate constants of 0.083, 0.085, 0.083, 0.073, 0.092 and 0.078 min −1 , respectively. It is found that the surface area normalized rate constants of nZVI@Fe-TA are 4–7 times higher than that of nZVI@Fe 2 O 3 counterpart, suggesting that the improved HM removal reactivity of nZVI@Fe-TA is derived from the surface modification. Moreover, nZVI@Fe-TA has advantages in resisting interference and in the simultaneous removal of different HM ions. Under a 30 min hydraulic retention time , Fe foam @Fe-TA could remove 98% HMs in the successive process. For real electroplating wastewater, Fe foam @Fe-TA exhibits excellent performance for Cr(VI) and Ni(II) removal, producing effluent of stable quality that meets local emission regulation. This study provides a facile strategy to remove the inherent passive iron oxide shell and enhance the HM removal reactivity for ZVI materials.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Ran Yang,Jun Cai,Hu Yang
Zero-valent aluminum (ZVAl) is a promising reductant because of its relatively low redox potential , which can efficiently activate molecular oxygen to generate reactive oxygen species . However, its long-term performance is limited by the intrinsic dense oxide layer and the passivation effect of the accumulative Al-(hydr)oxide on its surface during the reaction. In this study, four clay minerals with different compositions were mixed with ZVAl by ball milling to obtain four composites of ZVAl and clay (ZVAl-Clay), which were used to degrade a high concentration of 4-chlorophenol (4-CP) under ambient conditions. The oxidation efficiencies of different ZVAl-Clays were strongly relevant to Fe contained in the clay minerals. The Fe-free ZVAl-Clay presented poor oxidation performance, whereas the reaction efficiencies of those ZVAl composites with Fe-bearing clays exhibited varying degrees of improvement. In comparison with the original ZVAl, the highest oxidation rate increased by 23 times, the maximum increased OH production was approximately 8 times, and the corresponding mineralization efficiency improved by 38.7%. However, the levels of improved oxidation performance of various ZVAl-Clays were not positively correlated with their actual total Fe contents, and their degradation efficiencies might also be affected by other physical and/or chemical properties of different clays. The synergistic mechanism revealed by various characterizations was that electron transfer might occur from ZVAl to the structural Fe(III) of the clay through the basal plane or edge of clays triggered by ball milling. Thus, the partially produced Fe(II) on the clay surface promoted the Fenton-like reaction to decompose H 2 O 2 into OH for efficient oxidation of 4-CP. In short, the ZVAl composites with Fe-bearing clays deserved further exploration as potential materials for efficient degradation of organic matters in wastewater samples.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Dongmei Dai,Bo Wei,Ying Li,Xiao Ma,Shuang Liang,Shuo Wang,Lingling Xu
Developing high-efficient and Earth-abundant electrocatalysts toward hydrogen evolution reaction (HER) is strongly desired for electrochemical water splitting but remains a considerable challenge. Herein, we propose a 3D hierarchical Fe(PO 3 ) 2 @Cu 3 P heterostructure nanotube arrays on Cu foams for promising HER catalysts. The HER performance can be tuned by changing FeCl 3 concentrations and the optimized cathode exhibits excellent HER activity in 1 M KOH with a low overpotentials of 108 mV @ 10 mA cm −2 and a small Tafel slope of 84 mV dec −1 . Furthermore, this electrode delivers high electrochemical durability with stable operation for 24 h. Such high performance can be ascribed to the unique hierarchical heterostructure with large electrochemical surface area, synergistic effect and fast electron transport . Our study can provide new inspiration for rational construction of copper-based hierarchical nanomaterials for HER electrodes and other energy-related applications.
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APPLIED CLAY SCIENCE
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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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JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Yajing Wang,Yane Zheng,Yuhao Wang,Hua Wang,Xing Zhu,Yonggang Wei,Yaming Wang,Lihong Jiang,Zhiyuan Yang,Kongzhai Li
Chemical looping reforming of methane (CLRM) technology is a new approach for syngas and pure hydrogen generation . During the whole reaction, methane is first partially oxidized to syngas by the lattice oxygen of the oxygen carrier, and then the lattice oxygen of the reduced oxygen carrier is recovered by thermal water splitting, with pure hydrogen produced. LaMnO 3 is used as an oxygen carrier for the CLRM. It obtains a high resistance to carbon deposition , while a lower CH 4 conversion due to the unstable structure. Fe ion substitution in LaMnO 3 can be used to improve its reactivity and thermal stability. La 1-x MnFe x O 3 /LaMn 1-x Fe x O 3 (x = 0.05, 0.1, 0.15, 0.2) oxygen carriers own higher reactivity and better resistance to carbon deposition, producing high purity syngas and hydrogen. La 0.85 MnFe 0.15 O 3 sample exhibits the highest CO selectivity (~99%), syngas productivity (3.78 mmol g −1 ) and H 2 productivity (1.76 mmol g −1 ) due to the higher oxygen vacancy concentration, and its H 2 /CO molar ratio is maintained at the ideal ratio of 2.0 (1.93–2.07) during the whole process. Notably, no carbon deposition is generated over LaMnO 3 , La 0.85 MnFe 0.15 O 3 and LaMn 0.9 Fe 0.1 O 3 oxygen carriers even after 20 redox cycles, and La 0.85 MnFe 0.15 O 3 exhibits superior resistance to carbon deposition due to the better structural and thermal stability.
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120944
·
IF 7.2
Yong Xiang,Li Xu,Guoji Liu
Efficient recovery of Au(III) from electronic and industrial waste streams is of both economic and environmental importance. Herein, a pore-regulation strategy was developed to construct hierarchically porous NH 2 -MIL-101(Fe 1-x Cu x ). By employing 2-aminoterephthalic acid to coordinate simultaneously with Fe 3 + and Cu 2+ , the unstable Cu–O bonds were selectively removed through a mild acid-soaking treatment, thereby generating enlarged channels and hierarchical micro–mesoporous structures. The optimized framework achieved an Au(III) adsorption capacity of 944 mg g −1 , which was ∼30.7 % higher than that of unmodified NH 2 -MIL-101. Mechanistic studies demonstrated that the hierarchical pore architecture not only facilitated mass transfer but also enhanced accessibility of active sites, synergistically contributing to the superior adsorption performance. This work highlights that rational pore-channel engineering around adsorption sites can substantially boost the recovery efficiency of reducible precious metals, offering a novel design paradigm for advanced MOF-based adsorbents.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Dongdong Liu,Shun-xin Chen,Runkai Wang,Lin Li,Jiangyan Ji,Tong Wu,Kunlin Ke,Fei Chai
Enrofloxacin (ENR), characterized by its remarkable stability and resistance to degradation, has become a significant contaminant in aquatic ecosystems. In this study, a CNC/UiO-66(Fe) composite was synthesized via a one-step hydrothermal method, and response surface methodology (RSM) was employed to optimize the key experimental conditions for the efficient removal of ENR from aqueous solutions. The incorporation of cellulose nanocrystals (CNC) improved the dispersibility and stability of UiO-66, and significantly enhanced the crystallinity of the material, as confirmed by XRD analysis. Iron (Fe) doping introduced additional active sites and defects, synergistically enhancing the overall adsorption capacity. The composite exhibited a high BET surface area of 1294.81 m 2 /g and a well-developed porous structure. The adsorption process was spontaneous and exothermic, fitting well with both the pseudo-second-order kinetic model and the Langmuir isotherm model. Under alkaline conditions, the material showed excellent adsorption performance, with a theoretical maximum adsorption capacity of 275.84 mg/g for ENR at 25°C and pH 10. The adsorption mechanism involved multiple synergistic interactions, including electrostatic attraction, hydrogen bonding, π-π stacking, metal coordination, and pore filling. Furthermore, CNC/UiO-66(Fe) exhibited excellent stability and reusability, retaining over 80% of its removal efficiency after five cycles. This study provides an effective and sustainable approach for remediating antibiotic contaminants in aquatic environments.
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WATER RESEARCH
·
2025
·
IF 12.4
Rundong Chen,Wenxiao Zheng,Shishu Zhu,Fangshu Qu,Hengyi Fu,Li Tian,Huarong Yu,Jianyi Zhou,Lele Tu,Chunhua Feng
Coagulation with Fe(III) salts is a prevalent phase separation method for organic wastewater treatment. Nevertheless, our industrial applications have shown that using Fe(III) coagulants in landfill leachate treatment leads to an unexpected increase in the bio-toxicity of the effluent. This observation prompts us to identify the toxic compounds and explore their formation mechanisms. Laboratory experiments demonstrate that while Fe(III) coagulation removed approximately 92% of the total organic matter from landfill leachate, it increased the acute bio-toxicity by about 14.5 times relative to the untreated effluent. Molecular analysis of the dissolved organic matter (DOM) in the leachate using Fourier transform ion cyclotron resonance mass spectrometry revealed a significant generation of chlorinated organic compounds during coagulation process. Compared to the Fenton system, the chlorinated compounds formed after coagulation showed a lower oxidation level and predominantly saturated and reduced state. The mechanistic studies suggest that reactive oxygen and chlorine species have a minimal role in the coagulation-induced chlorination. Instead, it is proposed that the redox reaction between Fe(III) and DOM leads to the formation of phenolic radicals, which facilitate nucleophilic reactions with Cl − (as an electron donor), thereby generating chlorinated compounds.
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PHYSICA B-CONDENSED MATTER
·
2025
·
IF 2.8
Han Zheng,Dongxu Pan,Ling Zhang,Guodong Yang,Zhengfa Li
NaNbO 3 - x Fe 2 O 3 bulk ceramics have been synthesized to investigate the effects of low-concentration Fe-doping on the crystal structure, dielectric and ferroelectric properties of NaNbO 3 ceramics. The results demonstrate that Fe element either incorporates interstitially into the crystal lattice or substitutes for Nb element at B-site of NaNbO 3 in the low doping range of x < 0.75 mol%. Interstitial doping of Fe reveals a unique broken-line-shaped P - E hysteresis loop with lower remnant polarization P r . Compared to interstitial doping of Fe atom, the substitution of Fe 3+ ion for Nb 5+ ion can result in more fine and uniform-distributed grains, thereby improving the electrical breakdown strength E b . When the Fe-doping concentration of x ≥ 0.75 mol% exceeding its solid solubility, the precipitation of second phase Fe 2 O 3 at grain boundaries occurs. Then the heterogeneous interfacial polar layers between Fe 2 O 3 and NaNbO 3 are constructed, and the interfacial-charge effect increases the peak value of dielectric constant to 4500 at room temperature and maximal polarization P max up to 43 μC cm −2 . Furthermore, Fe-doping induces the accumulation of space charges around domain walls, thus, those charged domain walls generate negative dielectric constant at their specific resonant frequencies, by coupling with the forced vibration of space charges under alternating electric fields. This study reveals the influencing mechanisms of magnetic element Fe-distribution states on the structure and some physical properties of NaNbO 3 ceramics, providing valuable insights for further design of high-energy-storage NaNbO 3 -based ceramic systems.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Asim A. Mohammed,Zhenfei Li,Bo Liu,Dong Yan,Jian Li,Lichao Jia
Protonic ceramic fuel cells (PCFCs) are highly efficient energy conversion devices that operate at relatively low temperatures. Enhancing their performance strongly relies on developing cathode materials with high electrocatalytic activity. This study presents a double-doped perovskite material, Pr 1.5 La 0.3 Ba 0.2 Ni 0.9 Fe 0.1 O 4+δ (PLBNF), where the electrochemical properties are significantly improved through composition and structural tuning. Comprehensive characterization confirms that the co-doping strategy effectively enhances the hydration capability, oxygen reduction reaction (ORR) activity, and operational stability. At 700 °C, the polarization resistances of the PLBNF cathode and the PLBNF-BZCYYb composite cathode are 0.11 and 0.08 Ω cm 2 , respectively, with peak power densities reaching 1012 and 1277 mW cm −2 . Fuel cell tests demonstrate excellent operational stability for the PLBNF-BZCYYb air electrode, indicating its strong potential for application in high-performance proton-conducting ceramic fuel cells. This work provides new insights into the development of efficient fuel cell materials and advances related energy technologies.
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