COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Longfei Xia,RiSheng Li,Menglin Yao,Xu Deng,Wen Sun,Miaomiao Du
In this study, micron Zero-valent Iron (mZVI), an affordable and well-dispersible reducing agent, was investigated for its potential application in removing Sb(V) from wastewater. Since Sb(V) primarily exists as Sb(OH) 6 - in aqueous solutions, the lower the pH, the more effective mZVI is in removing Sb(V). At a pH level of 3, mZVI (1.0 g/L) was able to remove more than 99 % of Sb(V) (20 mg/L) from the wastewater. The study also compared the influence of cations and anions on mZVI and found that anions had a greater impact on the material's performance. The paper further examined the impact of different heavy metal ions on mZVI and determined that the adsorption capacity of mZVI towards these ions follows the order of their reducing ability. Summarizing the removal mechanism of Sb(V) by mZVI, it was found that both adsorption and redox reactions played crucial roles and Sb(V) is ultimately removed from water through coprecipitation by combining with Fe-O on the mZVI surface. Theoretically, the maximum adsorption capacity of the mZVI material used in this study could reach 21.60 mg/g for Sb(V). This makes mZVI a promising environmental adsorption material and a potential solution for treating water pollution caused by antimony mining.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Li Gong,Jingting Chen,Yao Hu,Kai He,Eric J. Bylaska,Paul G. Tratnyek,Feng He
Chloroform (CF) is a widely used chemical reagent and disinfectant and a probable human carcinogen. The extensive literature on halocarbon reduction with zerovalent iron (ZVI) shows that transformation of CF is slow, even with nano, bimetallic, sulfidated, and other modified forms of ZVI. In this study, an alternative method of ZVI modification─involving simultaneous sulfidation and nitridation through mechanochemical ball milling─was developed and shown to give improved degradation of CF (i.e., higher degradation rate and inhibited H2 evolution reaction). The composite material (denoted as S–N(C)–ZVI) gave synergistic effects of nitridation and sulfidation on CF degradation. A complete chemical reaction network (CRN) analysis of CF degradation suggests that O-nucleophile-mediated transformation pathways may be the main route for the formation of the terminal nonchlorinated products (formate, CO, and glycolic polymers) that have been used to explain the undetected products needed for mass balance. Material characterizations of the ZVI recovered after batch experiments showed that sulfidation and nitridation promoted the formation of Fe3O4 on the S–N(C)–ZVI particles, and the effect of aging on CF degradation rates was minor for S–N(C)–ZVI. The synergistic benefits of sulfidation and nitridation on CF degradation were also observed in experiments performed with groundwater.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 5
·2493
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IF 4.9
Zhu Ying,Meng Yin,Zifu Zhu,Zheng Shang,Yanqun Pei,Jing Liu,Qun Liu
Iron is an indispensable nutrient for the survival ofToxoplasma gondii; however, excessive amounts can lead to toxicity. The parasite must overcome the host’s “nutritional immunity” barrier and compete with the host for iron. SinceT. gondiican infect most nucleated cells, it encounters increased iron stress during parasitism. This study assessed the impact of iron stress, encompassing both iron depletion and iron accumulation, on the growth ofT. gondii. Iron accumulation disrupted the redox balance ofT. gondiiwhile enhancing the parasite’s ability to adhere in high-iron environments. Conversely, iron depletion promoted the differentiation of tachyzoites into bradyzoites. Proteomic analysis further revealed proteins affected by iron depletion and identified the involvement of phosphotyrosyl phosphatase activator proteins in bradyzoite formation.Keywords:Toxoplasma gondii;iron depletion;iron accumulation;bradyzoite differentiation
研究领域:
寄生虫学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
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IF 10.8
Wenqiang Xu,Chenyun Xia,Feng He,Zhenyu Wang,Liyuan Liang
Sulfidation of nanoscale zerovalent iron (nZVI) can enhance particle performance. However, the underlying mechanisms of nZVI sulfidation are poorly known. We studied the effects of Fe2+ on 24-h dynamics of nZVI sulfidation by HS– using a dosed S to Fe molar ratio of 0.2. This shows that in the absence of Fe2+, HS– rapidly adsorbed onto nZVI particles and reacted with surface iron oxide to form mackinawite and greigite (<0.5 h). As nZVI corrosion progressed, amorphous FeSx in solution deposited on nZVI, forming S-nZVI (0.5–24 h). However, in the initial presence of Fe2+, the rapid reaction between HS– and Fe2+ produced amorphous FeSx, which deposited on the nZVI and corroded the surface iron oxide layer (<0.25 h). This was followed by redeposition of colloidal iron (hydr)oxide on the particle surface (0.25–8 h) and deposition of residual FeSx (8–24 h) on S-nZVI. S loading on S-nZVI was 1 order of magnitude higher when Fe2+ was present. Surface characterization of the sulfidated particles by TEM-SAED, XPS, and XAFS verified the solution dynamics and demonstrated that S2– and S22–/Sn2– were the principal reduced S species on S-nZVI. This study provides a methodology to tune sulfur loading and S speciation on S-nZVI to suit remediation needs.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Jieling Ren,Yuanzhe Peng,Aibin Zhu,Chunli Zheng,Chi He,Mudi Ma
Kaolinite-loaded amorphous zero-valent iron composite (K@AZVI) is a promising material for cadmium-contaminated soil remediation. Still, the impact of iron (Fe) oxides on the surface of K@AZVI on the immobilization of cadmium (Cd) in soils caused by varying water management remains unclear. Hence, this study investigated the transformation of Fe oxides in K@AZVI and their effects on Cd morphology under varying soil water management (drying, wetting, and flooding). The results indicated that under K@AZVI treatment, the pe + pH (pe = Eh (oxidation-reduction potential, mV) / 59.2) values decreased from 11.59 to 9.83 and 5.61 with increased soil water management. Meanwhile, the content of crystalline Fe oxides (Fe c ) decreased significantly by 34.02%-72.76%, while the content of amorphous Fe oxides (Fe o ) increased by 29.01%-55.20%. This transformation from crystalline to amorphous Fe oxides significantly enhanced the immobilization of Cd, resulting in a 30.30%-64.59% reduction in the available Cd content compared to the control. In addition, the proportion of low active Cd was enhanced from 32.94% to 56.10%, further indicating that K@AZVI exhibited superior immobilization in flooded soil. Characterization and calculations showed that water management significantly improved the immobilization of Cd by K@AZVI by regulating the crystallinity of Fe oxides and enhancing their electron transfer rate and adsorption capacity. Therefore, investigating the morphological transformation of Fe under varying water management will help us to understand the mechanism of Fe redox-mediated Cd transport and transformation in the soil system.
研究领域:
环境科学
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土壤学
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DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
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2025
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IF 10.9
Fei Han,Yaohui Xie,Lin Qu,Zhenzhou Wang,Wei Zhang,Guang Yang,Huiqin Hu,Meiting Huang,Haoxuan Yu,Liming Yang,Xubiao Luo
Deep removal of trace aluminum from lithium extraction slag (LES) is key to recovering high-purity battery-grade iron phosphate (FePO 4 ). Existing methods exhibit low aluminum removal due to the close solubility product constants of Al (III) and Fe (III). In this work, we propose a novel strategy for trace aluminum removal based on fluoride ion-mediated differential coordination of Al (III) and Fe (III). Through precise control of fluoride ion concentration in phosphoric acid solution, iron preferentially precipitates while aluminum predominantly forms soluble fluoride complexes. This distinct behavior enables precise elemental separation through fluoride content optimization. The developed separation technology achieved aluminum removal rate of 98.89 %. It is noteworthy that the aluminum content of precipitated FePO 4 is below 30 ppm, which meets the standard of battery-grade. This work provides a viable technical pathway for the industrialization of Al/Fe separation in the lithium extraction slag leachate and the regeneration of low-Al, high-purity FePO 4 .
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Yang Wang,Guorong Yi,Wanqiang Zhang,Jiawei Hou,Kuok Ho Daniel Tang,Bowen Wang,Hua Li,Quan Wang,Hamada Abdelrahman,Tao Zhang,Sabry M. Shaheen,Ronghua Li
In this study, the effects and mechanisms of water-soluble ferrous salts (WSFS) on the humification and carbon conversion during the co-composting of hoggery slurry (HG) and wheat husks (WH) were investigated. A composting mixture of HG and WH was treated with FeCl 2 addition (T1) and FeSO 4 addition (T2), and compared with an untreated control (CK), as a function of time (28 days). The duration of the high-temperature phase (>50 °C) for CK, T1, and T2 are 17, 15, and 15 days, respectively. Compared to the CK, T1 and T2 treatments reduced CO 2 emissions by 11.4 % and 32.0 %, respectively. The calculated total global warming potential values were 293.67 (CK), 267.69 (T1) and 207.10 (T2) g CO 2 eq kg −1 . The humus concentrations increased in all treatments: CK by 28.10 %, T1 by 53.41 % and T2 by 49.73 % in composting. WSFS addition enhanced biotic humification by elevated the abundance and distribution of Bacillus , which promotes cellulose and hemicellulose decomposition, and Tepidimicrobium , which accelerates the production of humus, through use of sugars and proteins. Besides, WSFS addition decreased the levels of pathogenic bacteria in the final compost product. Notably, WSFS addition also benefited the abiotic humification by production of •OH during oxidation of Fe(II) in composting. This study enhances the understanding of the biotic and abiotic functions of FeSO 4 and FeCl 2 in promoting humification and reducing carbon emissions during composting. The detailed role of hydroxyl radical in composting and the effectiveness of WSFS-addition in composting nitrogen transformation are still need to be addressed in future.
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
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IF 1.8
Juan Liu,Yu Sun,Lilin Xiang,TuLai Sun,Zilong Yu,Bing Cui,Chuangui Jin
In the present study, SrTiO 3 was selected to enhance the multiferroic characteristics of Bi 0.88 Sm 0.12 FeO 3 (BSF) ceramics. With increasing SrTiO 3 content, the principal phase of BSF ceramic transitions from rhombohedral R3c to Pna2 1 . Through DSC and dielectric analysis, it was observed that both the Curie temperature and Néel temperature decreased proportionally with the augmentation of SrTiO 3 content. When x = .1, the optimal ferroelectric performance is achieved, and the highest remanent polarization value is 55.47 µC/cm 2 , significantly surpassing that of BSF ceramics. Moreover, the PFM test results showed that as the substitution content increased, the domains in the BSF ceramic gradually transformed from normal ferroelectric domains to polar nanomicro-domains. Magnetic and magnetoelectric results show that when x = .1, the best magnetic properties are obtained, M r = 59.7 emu/mol. The magnetoelectric coefficient α ME initially increased and then decreased with the increasing SrTiO 3 content, reaching its optimum magnetoelectric properties at x = .1, where α ME = .47 mV cm –1 Oe –1 . In summary, when the substitution amount of SrTiO 3 reaches 10%, the ferroelectric, magnetic, and magnetoelectric properties of BSF ceramics are significantly improved.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 6
·48345
·
IF 2.188
Libo Wang,Yuchang Su,Jing Zhang,Hongzhi Zhang,Qiaoqiao Dong
PVDF-CoFe 2 O 4 (CFO) thick membranes were synthesized by solvent casting method. The mixed organic solvents consist of N-methyl-2-pyrrolidone (NMP) and Ethyl acetate (EA), in which the mass ratios of NMP and EA (NMP:EA = 1:0, 1:1, and 1:2) and the temperature of solvent evaporation (range from 50 to 80 °C) has been considered. The phase structure, β-PVDF phase content, and electrical and magnetic properties of these membranes were investigated to reveal the effect of EA addition and temperature on these properties. Results manifest that all samples showed coexistence of ferroelectric and ferromagnetic properties at room temperature. EA addition makes film more compact, which may be responsible for the differences in ferromagnetic properties. Adding EA and enhancing temperature resulted in phase transition of PVDF from α and γ to β, which contributed to membranes’ ferroelectric performances. In all samples, NMP:EA = 1:2 treated at 80 °C exhibits the maximum β-phase fraction and polarization (Pmax) of 87.2% and 2.398 μC cm −2 , respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48345.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Lixia Yan,Qingze Chen,Yixuan Yang,Runliang Zhu
With high surface reactivity and weak crystallinity , ferrihydrite (Fh) tends to be transformed to other thermodynamically stable iron (hydr)oxides, and its transformation is strongly influenced by the coexisting substances. Clay minerals widely coexist with Fh in the near-surface areas, but there is limited information about their effects on the transformation of Fh. In this work, the effect of montmorillonite (Mt) on the formation of hematite (Hem) nanoparticles from Fh under heat treatment was studied. Fh, Mt, and their mixed samples (Fh-Mt) were heated at different temperatures (350, 450, 600, 700, and 800 °C) for various times (3, 5, and 10 h), and the samples before and after heating were well characterized. X-ray diffraction and 57 Fe Mössbauer spectroscopy results revealed that Fh was transformed to Hem after heat treatment in both the presence and absence of Mt. Scanning electron microscopy and transmission electron microscopy images indicated that Mt could well disperse Fh and distinctly decrease the particle sizes of the formed Hem after heating. In particular, the particle size of Hem reached ~1000 nm in the pure Fh system, while it was only 15–75 nm in the systems containing Mt. Fourier transform infrared spectroscopy patterns displayed the strong interactions between Mt and Fh (through the formation of Si−O−Fe and Al−O−Fe bonds), which may also reduce the aggregation of Fh and inhibit the phase transformation of Fh particles into large Hem particles. This work verifies the important protective effect of clay minerals on coexisting iron oxide under high-temperature conditions, which would contribute to better understanding the formation and preservation of natural nano-sized minerals (particles) in nature.
研究领域:
地质学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 2
·025902
·
IF 1.62
Dong Zhang,Bingjun Zhu,Shiqi Ren,Qingru Wang,Qinglin Wang,Shuhong Li,Bingyuan Zhang,Wenjun Wang
ZnAl2O4 with spinel structure has attracted more attentions due to its robust dielectric and luminescence properties. Complex cation distribution in spinel structure influences the optical and magnetic properties. Herein, we report white emission related to the defects and the magnetism assigned to Fe impurity in ZnAl2-xFexO4 (0\leqslant x\leqslant 0.6) nanocrystals fabricated by using common sol-gel method at a relatively lower temperature (700 °C) than that reported earlier. ZnAl2-xFexO4 phosphors reveal single spinel phase without impure phase. Complex cation distribution is observed in all samples, for instance, Fe and Zn in antisites, cation vacancies, and with Fe content increasing, cation distribution reveals obvious change. The band gap energy of ZnAl2-xFexO4 phosphors is reduced from 3.84 eV to 3.33 eV when the content of Fe ions (x value) increases from 0 to 0.6. Two wide band emissions assigned to the various types of shallow and deep donor/acceptor defects are observed, monitoring with the excitation wavelength of 280 nm. The Commission International de I'Eclairage (CIE) colour coordinate (x, y) of the ZnAl2-xFexO4 phosphors is found to shift from (0.3218, 0.2957) to (0.3422, 0.3122) with Fe doping in spinel lattices owing to rearrangement of defects, indicating the potential application in white-light illumination. ZnAl2-xFexO4 reveals a room ferromagnetism resulting from Fe3 + ions in spinel lattices.
研究领域:
材料科学
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光学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Dongshun Sai,Xiaoxiang Cheng,Peijie Li,Xinsheng Luo,Jin Wang,Haiqing Chang,Daoji Wu,Heng Liang
Substantial amounts of hazardous shale gas produced water (SGPW) were generated with the development of hydraulic fracturing and horizontal drilling technologies. While membrane technique has gained popularity for SGPW treatment, membrane fouling remains a significant obstacle. Herein, a novel pretreatment process of ferrate (Fe(VI)) oxidation enhanced by ferrous iron (Fe(II)) was suggested to mitigate ultrafiltration membrane fouling in the treatment of SGPW. Results indicated that Fe(II)/Fe(VI) (100/30 μM) pretreatment increased the terminal normalized flux from 0.18 to 0.47, while reducing the irreversible and reversible fouling resistances by 71.1 % and 83.6 %, respectively. Interfacial free energy assessment revealed that Fe(II)/Fe(VI) pretreatment significantly enhanced the repulsive forces between pollutants and the membrane. Furthermore, the water quality of SGPW was generally improved by Fe(II)/Fe(VI) treatment, in comparison with single Fe(VI) oxidation. The synergistic effect of Fe(II) and Fe(VI) facilitated pollutants aggregation and enhanced the conversion of organic contaminants. In general, the generated high-valent iron intermediates (Fe(IV)/Fe(V)) were key contributors to the synergistic process and prolonged the oxidation duration. Simultaneously, the formation of Fe(III) promoted the flocculation performance. This novel approach presents promise for effective SGPW treatment and membrane fouling mitigation.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）