ISIJ INTERNATIONAL
·
2017
·Vol. 57
·期 1
·62-67
·
IF 1.11
Zijian Su,Yuanbo Zhang,Yingming Chen,Guanghui Li,Tao Jiang
A considerable amount of works were focused on the formation mechanism of calcium ferrite phases during the iron ore sintering process, especially under various O2 content atmospheres at temperatures higher than 1100°C. But little attention has been paid on reactions between CaO and iron oxides in CO–CO2 atmospheres at lower temperatures. In this study, the solid state reaction mechanisms between CaO and Fe3O4 under CO–CO2 atmospheres at 800°C–1100°C were revealed by using XRD, VSM, etc. The results indicated that Ca2Fe2O5 was easily formed under 5–50 vol% CO/(CO+CO2) atmosphere above 850°C via the reaction of 6CaO + 2Fe3O4 +CO2 = 3Ca2Fe2O5 + CO and the reaction would be promoted with increasing the roasting temperature. In the CO–CO2 atmosphere, Fe3O4 is easily oxidized to Fe2O3 in the presence of CaO because CO2 components act as oxidative medium for the oxidation of Fe2+ to Fe3+.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Lian-Kui Wu,Hao Wu,Zheng-Zheng Liu,Hua-Zhen Cao,Guang-Ya Hou,Yi-Ping Tang,Guo-Qu Zheng
A novel copper ferrite foam fabricated on Fe-Ni foam substrate was synthesized via a simple hydrothermal method to efficiently remove arsenic from aqueous solution. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-Ray diffraction pattern (XRD) and Raman spectra were used to characterize the morphology and surface composition of the copper ferrite foam (CFF). The adsorption behavior of As(III) and As(V) onto this CFF is studied as a function of solution pH, temperature, contact time, and different concentrations. Results shown that this CFF has high adsorption capacity and excellent recyclability . Adsorption isotherms study indicates Langmuir model of adsorption. The maximum adsorption capability of As(III) and As(V) on CuFe 2 O 4 foam is observed about 44.0 mg g −1 and 85.4 mg g −1 , respectively. Regeneration experiment indicates that arsenic could be easily desorbed from CFF with 0.10 mol L −1 NaOH and the high adsorption capacity can be maintained for six regeneration cycle.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2019
·Vol. 45
·期 3
·463-471
·
IF 1.634
Ming Zhang,Fengqi Zhao,Yanjing Yang,Ting An,Wengang Qu,Hui Li,Jiankan Zhang,Na Li
Three kinds of ferrates (NiFe 2 O 4 , ZnFe 2 O 4 and CoFe 2 O 4 ) were prepared via the facile solvothermal method and characterized using SEM, TEM, XRD, XPS, FT-IR and BET instruments. The NiFe 2 O 4 , CoFe 2 O 4 and ZnFe 2 O 4 particles possess hollow structure with average particle size of 70, 220 and 360 nm, respectively. The catalytic performance of the ferrates for AP thermal decomposition were studied using DSC and TG-DTG methods, and the decomposition mechanism of AP were suggested. The catalytic effects of different ferrates for AP thermal decomposition were significantly different. The CoFe 2 O 4 has the best catalytic activity, and the high thermal decomposition peak temperature ( T HDP ) and apparent activation energy ( E a ) of AP were decreased by 108.99 °C and 37.38 kJ mol −1 in the presence of CoFe 2 O 4 sample. Adding ferrates has no obvious influence on the gas-phase decomposition products of AP, but has a great influence on the energy barrier of high temperature decomposition of AP. The excellent catalytic activity of CoFe 2 O 4 is mainly attributed to the synergistic interaction between Fe and Co, which is conducive to the thermal decomposition of AP.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 23
·22998-23008
·
IF 2.8
Zhao Junfeng,Wang Qun,Fu Yongsheng,Peng Bo,Zhou Gaofeng
In this study, the effect of Fe 3+ , Fe 2+ , and Mn 2+ dose, solution pH, reaction temperature, background water matrix (i.e., inorganic anions, cations, and natural organic matters (NOM)), and the kinetics and mechanism for the reaction system of Fe(VI)/Fe 3+ , Fe(VI)/Fe 2+ , and Fe(VI)/Mn 2+ were investigated systematically. Traces of Fe 3+ , Fe 2+ , and Mn 2+ promoted the DCF removal by Fe(VI) significantly. The pseudo-first-order rate constant ( k obs ) of DCF increased with decreasing pH (9–6) and increasing temperature (10–30 °C) due to the gradually reduced stability and enhanced reactivity of Fe(VI). Cu 2+ and Zn 2+ ions evidently improved the DCF removal, while CO 3 2− restrained it. Besides, SO 4 2− , Cl − , NO 3 − , Mg 2+ , and Ca 2+ almost had no influence on the degradation of DCF by Fe(VI)/Fe 3+ , Fe(VI)/Fe 2+ , and Fe(VI)/Mn 2+ within the tested concentration. The addition of 5 or 20 mg L −1 NOM decreased the removal efficiency of DCF. Moreover, Fe 2 O 3 and Fe(OH) 3 , the by-products of Fe(VI), slightly inhibited the DCF removal, while α-FeOOH, another by-product of Fe(VI), showed no influence at pH 7. In addition, MnO 2 and MnO 4 − , the by-products of Mn 2+ , enhanced the DCF degradation due to catalysis and superposition of oxidation capacity, respectively. This study indicates that Fe 3+ and Fe 2+ promoted the DCF removal mainly via the self-catalysis for Fe(VI), and meanwhile, the catalysis of Mn 2+ and the effect of its by-products (i.e., MnO 2 and MnO 4 − ) contributed synchronously for DCF degradation.
ᅟ
研究领域:
环境科学
·
化学动力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jingjing Yao,Yi Deng,Dong-Sheng Li,Haipu Li,Hui Ying Yang
Antibiotics have been considered an evolving environmental challenge in the last few decades due to their mutagenic and persistent effects. Herein, we synthesized γ-Fe 2 O 3 and ferrites nanocomposites co-modified carbon nanotubes (γ-Fe 2 O 3 /MFe 2 O 4 /CNTs, M: Co, Cu, and Mn) with high crystallinity, thermostability, and magnetization for the adsorption removal of ciprofloxacin. The experimental equilibrium adsorption capacities of ciprofloxacin on γ-Fe 2 O 3 /MFe 2 O 4 /CNTs were 44.54 (Co), 41.13 (Cu), and 41.53 (Mn) mg/g, respectively. The adsorption behaviors followed the Langmuir isotherm and pseudo-first-order models. Density functional theory calculations revealed that the active sites preferentially appeared on the oxygen of the carboxyl group in ciprofloxacin, and the calculated adsorption energies of ciprofloxacin on CNTs, γ-Fe 2 O 3 , CoFe 2 O 4 , CuFe 2 O 4 , and MnFe 2 O 4 were –4.82, –1.08, –2.49, –0.60, and 5.69 eV, respectively. The addition of γ-Fe 2 O 3 changed the adsorption mechanism of ciprofloxacin on MFe 2 O 4 /CNTs and γ-Fe 2 O 3 /MFe 2 O 4 /CNTs. CNTs and CoFe 2 O 4 controlled the cobalt system of γ-Fe 2 O 3 /CoFe 2 O 4 /CNTs, while CNTs and γ-Fe 2 O 3 ruled the adsorption interaction and capacity of copper and manganese systems. This work reveals the role of magnetic substances, which is beneficial to the preparation and environmental application of similar adsorbents.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Jin Wang,Mengqing Sun,Lulu Wang,Xinni Xiong,Wenhuan Yuan,Yanyi Liu,Siyu Liu,Qiaozhi Zhang,Juan Liu,Yuqi Wang,Daniel C.W. Tsang
Arsenic (As) is a potentially toxic element with variable valence states. Due to high toxicity and bioaccumulation, As can pose a severe threat to the quality of the ecology as well as human health. In this work, As(III) in water was effectively removed by biochar-supported copper ferrite magnetic composite with persulfate. The copper ferrite@biochar composite exhibited higher catalytic activity than copper ferrite and biochar. The removal of As(III) could reach 99.8% within 1 h under the conditions of initial As(III) concentration at 10 mg/L, initial pH at 2–6, and equilibrium pH at 10. The maximum adsorption capacity of As(III) by copper ferrite@biochar-persulfate was 88.9 mg/g, achieving superior performance than mostly reported the metal oxide adsorbents. By means of a variety of characterization techniques, it was found that ∙OH acted as the main free radical for removing As(III) in the copper ferrite@biochar-persulfate system and the major mechanisms were oxidation and complexation. As a natural fibre biomass waste-derived adsorbent, ferrite@biochar presented a high catalytic efficiency and easy magnetic separation for As(III) removal. This study highlights the great potential of copper ferrite@biochar-persulfate application in As(III) wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiang Liu,Bingxue Chen,Yukun Huang,Yijun Cao,Jingbo Chen,Liqiang Wang,Yan Liu,Yangyang Fan
Indium, a strategic key metal, is mainly recovered from zinc leaching residue. However, a challenging problem in the treatment of zinc leaching residue is how to efficiently and cleanly treat the poorly soluble phase, the indium-bearing zinc ferrite (IBZF). Here, we propose a novel strategy for the selective extraction of indium , zinc and iron from IBZF. By introducing water to regulate the coordination environment of a choline chloride-anhydrous oxalic acid based deep eutectic solvent (ChCl-Oxa based DES), efficient leaching and deep separation of indium , zinc and iron were achieved. Water, acting as both co-solvent and diluent, played a critical role in the whole process. The addition of a little water reduces the viscosity of the DES, thereby improving the leaching of indium , zinc and iron. Under specific leaching conditions (leaching temperature of 90 °C, liquid/solid ratio of 20:1 ml/g, molar ratio of ChCl:Oxa = 1:1, molar ratio of DES:H 2 O = 1:3 and reaction time of 3.5 h), the leaching efficiencies of indium, zinc and iron were 96.27 %, 95.55 % and 96.33 %, respectively. The subsequent addition of large amounts of water dilutes and dissociates the structure of the DES, facilitating the stepwise precipitation and deep separation of metal ions. The precipitation efficiency of zinc and iron reached 93.06 % and 98.07 %, respectively. Residual indium ions in the solution were effectively adsorbed by activated carbon, with a recovery efficiency of 75.7 % after five cycles of adsorption. The solution separated from the metal ions was well regenerated by evaporation and addition of Oxa. Our work represents a novel approach for the recycling and clean utilization of zinc leaching residue. And the regulation of the coordination environment of metal ions in DES is proved to have great potential in metal recycling.
研究领域:
冶金工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2023
·Vol. 75
·期 2
·268-278
·
IF 2.6
Li Yan-Chun,Zhao Fei-Ping,Liu Hui,Peng Bing,Min Xiao-Bo,Lin Zhang
It is critical to recycle valuable elements such as zinc and iron from smelting waste containing zinc ferrite because of the resource crisis and environmental sustainability. Sulfating roasting followed by water leaching has been considered a promising approach. In this study, a novel sulfating roasting method using SO 2 has been developed to treat zinc ferrite for the efficient separation of zinc and iron. Moreover, the conversion mechanism of zinc ferrite and SO 2 was investigated in detail. The results showed that the transformation rate of zinc ferrite reached 95.47% at 600°C for 30 min under SO 2 /SO 2 + O 2 of 60% (v/v). The mechanism studies revealed that O in SO 2 combined with the O vacancy of \( {\text{Zn}}_{{{\text{A}} - {\text{site}}}}^{{2 + }} - {\text{O}} - {\text{Fe}}_{{{\text{B}} - {\text{site}}}}^{{3 + }} \) , while the S in SO 2 combined with the \( {\text{Fe}}_{{{\text{B}} - {\text{site}}}}^{{3 + }} \) of \( {\text{Zn}}_{{{\text{A}} - {\text{site}}}}^{{2 + }} - {\text{O}} - {\text{Fe}}_{{{\text{B}} - {\text{site}}}}^{{3 + }} \) for electron migration. S (IV) was oxidized to S (VI) while Fe 3+ was reduced to Fe 2+ . Importantly, zinc ferrite transformed into zinc-deficient magnetite intermediate ( \( {\text{Zn}}^{{2 + }} ({\text{Fe}}^{{2 + }} )_{{{\text{A}} - {\text{site}}}} - {\text{O}} - {\text{Fe}}^{{3 + }} ({\text{Fe}}^{{2 + }} )_{{{\text{B}} - {\text{site}}}} \) ) via reduction of Fe 3+ and migration of Fe 2+ . The transformation of zinc ferrite was a catalyst-free redox reaction. This study provided a new insight into the utilization of smelting waste and a theoretical basis for the efficient separation of zinc and iron from smelting waste containing zinc ferrite.
研究领域:
冶金工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Chao Kong,Caiyun Zhang,Rongfang Yuan,Tianci He,Huilun Chen,Beihai Zhou
The improvement in the degradation efficiency of dimethoate was achieved through the activation of UV light and metal ions . The study found that Fe(VI) was effectively activated by Cu(II), Fe(III), and Fe(II), resulting in an improved removal rate of dimethoate in water, with the activation efficiency of Cu(II) > Fe(III) > Fe(II). Under UV irradiation , the synergistic activation effects of UV-Cu(II) and UV-Fe(III) were most pronounced and positively correlated with light intensity. The mineralization rate of dimethoate by UV-Fe(III)-Fe(VI) reached up to 37 %, significantly outperforming the Cu(II)-Fe(VI) system. The main active species in the Cu(II)-Fe(VI) and Fe(III)-Fe(VI) systems were Cu(III) and Fe(IV)/Fe(V), while those in the UV-Fe(III)-Fe(VI) were ·OH and ·O 2 - radicals, respectively. In the UV-metal ions activated Fe (VI) system, the main degradation mechanisms of dimethoate were hydrolysis, cleavage, oxidation , and recombination. The impacts of water quality parameters on degradation efficiency were also investigated, finding that Cl - had almost no effect , while SO 4 2- had a slight repression effect, and HCO 3 - , CO 3 2- and NO 2 - exhibited strong inhibitory effects. Finally, the promising application of the UV-metal ion-Fe(VI) system in actual water environments was proposed, achieving effective removal with minimal environmental risks.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Bing Guo,Jiawei Hu,Jingsi Zhang,Zhigen Wu,Zhuo Li
This study explored the effect of potassium ferrate (PF) combined with ultrasound (US) pretreatment on methane generation from sludge by a series of experiments and simulations. Batch experiments showed that the pretreatment of PF coupled with US exhibited positively synergy on the methane yield. And by the pretreatment of 0.05 g/g TSS (total suspended solids) PF cooperated with US (1 W/mL, 25 kHz, 15 min), the methane yield was enhanced from 180.62 ± 3.26 to 228.83 ± 4.76 mL/g VSS (volatile suspended solids). Mechanism studies confirmed that the co-pretreatment of PF and US efficiently promoted sludge disintegration, and the biodegradability of sludge organics was obviously enhanced. Microbial community analysis showed that the functional microorganisms participating in sludge anaerobic digestion were enriched by PF cooperated with US pretreatment, with the total abundance enhanced from 12.96% in the control to 17.96% in PF + US pretreated reactor.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Ruoming Tong,Pengshuang Zhang,Yaoqi Yang,Ruiyuan Zhang,Xuhui Sun,Xingmao Ma,Virender K. Sharma
This paper presents a new process to synthesize ferrate(VI) (Fe VI O 4 −2 ) continuously through the oxidation of ferric ion (Fe 3+) by hypochlorite (OCl - ) under alkaline condition. Synthesis was performed under different experimental conditions ([OH - ] = 5.0 – 16.0 M, and T = 20 – 45 °C) to obtain optimum yield of ferrate(VI). Under the most favorable condition (i.e., ([Fe 3+ ] = 0.10 M, [OCl - ]: [Fe 3+ ] = 10.0, [OH - ] = 10.0 M, and T = 40 °C), the yield of ferrate(VI) in the newly designed reactor increased by about 11% in 60 min compared to conventional reactor (or increased in [FeO 4 2- ] from 4.0 × 10 −2 M to 4.5 × 10 −2 M). The rapid mixing under flow condition in the closed coil of the new reactor improved the reaction efficiency and yield. When [Fe 3+ ] was varied in the range from 0.10 to 0.20 M in the reactor under the same condition, the optimum concentration of Fe 3+ was at 0.16 M, which increased the concentration of FeO 4 2- to 6.8 × 10 −2 M. Applying ultrasound power density (5.0–25.0 W/L) in the reaction process further increased the yield by about 12% (or increased [FeO 4 2- ] from 6.8 × 10 −2 M without ultrasound to 7.6 × 10 −2 M at 15.0 W/L). Overall, operating the newly designed reactor under ultrasound could increase the concentration of synthesized ferrate(VI) from 4.0 × 10 −2 M to 7.6 × 10 −2 M. At pH 7.0, the prepared ferrate(VI) completely removed atrazine (ATZ), sulfachloropyridazine (SCP), ibuprofen (IBP), and naproxen (NAP)) in water.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Zhichao Bao,Vivian F. Lotfy,Xuesong Zhou,Shiyu Fu,Altaf H. Basta
Agricultural wastes are huge source of organic materials for preparation of active carbon, which can be applied to water treatment by absorbing the dissolved substances. Rice straw (RS) or their pulping byproducts, Kraft black liquor (KBL) and kraft lignin (Lignin-KBL) are used as precursors for the preparation of activated carbons (ACs). The process was carried out with activation assistance of potassium ferrate (K 2 FeO 4 ). The optimum temperature of activation on RS precursor is 700 °C evaluating by the textural analysis and the liquid phase adsorption models. The prepared activated carbon (RSFAC) under K 2 FeO 4 from RS at this temperature provided highest BET surface area and total pore volume (440.5 m 2 /g and 0.274 cm 3 /g). It had excellent adsorption capacities of cationic and anionic dyes and a maximum adsorption capacity of iodine (585.2 mg/g). Applied the optimum activation temperature to pulping by-products (KBL), the result showed AC with BET surface area and total pore volume of 378 m 2 /g and 0.218 cm 3 /g, respectively. These results are higher than that obtained from using phosphoric acid activating agent, and at temperature 450 °C (BET surface area and total pore volume were 310.6 m 2 /g and 0.243 cm 3 /g). The ferrate activation of RS and lignin-KBL is contributed to the function of iron oxide as an oxidation catalyst, which gave the ACs with mesoporous and microporous. Regarding to the liquid phase adsorption models and kinetics, anionic dye adsorption equilibriums of all RSFACs (Coomassie brilliant blue R-250 CBB) follow the Freundlich model, but the cationic methylene blue dye adsorption equilibriums mostly follow the Langmuir model. Adsorption kinetics of these RSFACs are well-explained in terms of dye kinetic adsorption by the pseudo-second-order model. The procedures for AC preparation from rice straw under K 2 FeO 4 provided a good route to utilize agricultural residues.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）