SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuanchuan Ren,Jun Wang,Guangfei Qu,Nanqi Ren,Ping Lu,Xiuping Chen,Zuoliang Wang,Yuyi Yang,Yan Hu
Three-dimensional electrochemical reactor (3DER) is an efficient technology for the treatment of printing and dyeing wastewater. The particle electrode between anode and cathode is the core unit of 3DER, which determines the treatment efficiency of wastewater. However, the deactivation of the particle electrode caused by the coverage of the catalytic sites seriously hindered the continuous operation of 3DER. In this work, γ-Fe 2 O 3 @CNTs particle electrode was prepared by immersion calcination , and its performance was evaluated by degradation of Rhodamine B (RhB) wastewater in 3DER. The study showed that in γ-Fe 2 O 3 @CNTs/Mn@FNE-3DER, the removal rate of RhB reached the best of 99.16% within 7 min under the conditions of γ-Fe 2 O 3 @CNTs dosage of 1.00 g·L -1 , initial RhB concentration of 100 mg·L -1 , pH 7.0, and current density of 20 mA·cm −2 . The superior catalytic activity of the system is mainly due to the charge transfer channel in γ-Fe 2 O 3 @CNTs structure, which improves the mass transfer efficiency of electrons. According to LC-MS analysis, the degradation process of RhB can be divided into five stages: deethylation, chromophore cracking, debenzylation and deamination, ring opening and mineralization. Hydroxyl radicals play an important role in this process. After the reaction, most RhB is converted into CO 2 and H 2 O. In addition, the study also showed that the Fe 3+ /Fe 2+ circulating system formed between the anode and cathode was the important reason for the high degradation efficiency of RhB. After five cycles of experiments, the degradation efficiency of 92.55% was still maintained, indicating that the particle electrode has significant stability and reusability in the catalytic process. To sum up, the excellent performance of γ-Fe 2 O 3 @CNTs particle electrode in three-dimensional electrochemical system provides a promising idea for the actual treatment of printing and dyeing wastewater.
研究领域:
环境工程
·
电化学
·
水处理
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 65
·52369-52381
·
IF 3.84
Zhanchao Liu,Zhaoyong Hu,Yan Liu,Minjia Meng,Liang Ni,Xiangguo Meng,Guoxing Zhong,Fangfang Liu,Yanmin Gao
Utilising a general protocol for making surface-imprinted core–shell microparticles via a RAFT-mediated approach, we developed a Cu(II) imprinted polymer with a novel magnetic nanosphere, γ-Fe2O3@meso-SiO2, as support. Attributed to the controlled/living polymerization mechanism of the RAFT polymerization process, the Cu(II) imprinted polymer prepared by RAFT polymerization (IIP-RAFT) presented a more well-defined morphology, more mono-dispersed properties, and much higher magnetic responsiveness, compared to the Cu(II) imprinted polymer prepared by traditional free-radical polymerization (IIP-TP). Moreover, in the static saturation binding experiments, a higher binding capacity of IIP-RAFT (210 mg g−1) than IIP-TP (145 mg g−1) was also found. Afterwards, a series of adsorption experiments were carried out to systematically evaluate the adsorption performance of the as-prepared IIP-RAFT. And the results showed that IIP-RAFT exhibited excellent selectivity, good reusability and desirable dynamic adsorption behavior, and could be an ideal candidate for SPE sorbents for the removal of Cu(II) in real wastewater.
研究领域:
材料科学
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环境科学
·
分析化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Liping Ren,Wei Zhou,Bojing Sun,Haoze Li,Panzhe Qiao,Yachao Xu,Jiaxing Wu,Kuo Lin,Honggang Fu
Defect-engineered magnetic γ-Fe 2 O 3 ultrathin nanosheets/mesoporous black TiO 2 hollow sphere heterojunctions (γ-Fe 2 O 3 /b-TiO 2 ) are fabricated by a metal-ion intervened hydrothermal technique and high-temperature hydrogenation, which exhibit wide-spectrum response and magnetic separation. The specific surface area, pore size and pore volume of the resultant γ-Fe 2 O 3 /b-TiO 2 with hollow structure are ∼63 m 2 g −1 , 10.5 nm and 0.14 cm 3 g −1 , respectively. After surface hydrogenation, α-Fe 2 O 3 nanosheets are converted to γ-Fe 2 O 3 ultrathin nanosheets (∼6 nm) combined with the formation of surface defects. The ultrathin nanosheet structure facilitates the surface engineering and also favors the diffusion and transportation of photogenerated charge carriers. The apparent rate constant (k) of defect-engineered γ-Fe 2 O 3 /b-TiO 2 photocatalytic degradation biotoxic tetracycline is ∼3 times higher than that of α-Fe 2 O 3 /b-TiO 2 under AM 1.5 irradiation. The enhancement is attributed to the introduction of narrow bandgap unit-cell-thick γ-Fe 2 O 3 nanosheets, the hollow structure and the defect engineering, which are beneficial to solar-light-harvesting and rapid electron transport, and spatial separation of photogenerated charge carriers. The photocatalytic degradation mechanism is also proposed. The novel magnetic γ-Fe 2 O 3 /b-TiO 2 heterojunction is a promising photocatalyst for recovering the domestic sewage in environment.
研究领域:
材料科学
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环境科学
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纳米技术
·
光催化
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产品关联
DOI
高影响因子
Metals
·
2015
·Vol. 5
·期 4
·2401-2412
·
IF 0.883
Yongli Li,Chunxia Zhu,Jinqing Kan
Superparamagnetic nanomaterials are showing great prospects in medical treatments with targeting medicines. A new conductive superparamagnetic nanocomposite, γ-Fe2O3/polyaniline-curcumin (γ-Fe2O3/PANI-curcumin), was prepared by using the interaction between an amino group in polyaniline and a ketone group in curcumin. The γ-Fe2O3/PANI-curcumin nanocomposite showed superparamagnetism (30 emu·g−1) and electrochemical activity, based on the results of magnetization curve and cyclic voltammetry (CV). Transmission electron microscope (TEM) indicated that the particle size of γ-Fe2O3/PANI-curcumin was between 10 and 50 nm. Fourier transform infrared spectra (FT-IR) and X-ray diffraction (XRD) were used to characterize the γ-Fe2O3/PANI-curcumin nanocomposite, confirming that curcumin was immobilized into the γ-Fe2O3/PANI chain. This study provided an academic foundation for developing a new material for immobilizing an anticancer drug.Keywords:curcumin;maghemite;nanocomposites;polyaniline;superparamagnetism
研究领域:
材料科学
·
医学
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药学
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产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2020
·Vol. 17
·期 3
·1075
·
IF 2.849
Jinpeng Wang,Ming Zhang
In this paper, biochar (BC) was prepared from discarded grapefruit peel and modified to prepare magnetic biochar (MBC). Physical and chemical properties of BC and MBC were characterized, and the results showed that the type of iron oxide loaded by MBC was γ-Fe2O3. Compared with BC, MBC has a larger specific surface area and pore volume, with more oxygen-containing functional groups on the surface. BC and MBC were used to adsorb and remove endocrine-disrupting chemical (EDC) bisphenol A (BPA) from simulated wastewater. The results showed that the adsorption kinetics and adsorption isotherm of BPA adsorption by BC and MBC were mainly in accordance with the pseudo-second-order kinetics model and the Langmuir model. This indicates that the adsorption of BPA on BC and MBC is mainly a chemically controlled monolayer adsorption. Adsorption thermodynamics show that BC and MBC adsorption of BPA is a spontaneous exothermic reaction, and lowering the temperature is conducive to the adsorption reaction. The effect of solution pH on the adsorption of BPA by both was significant. The optimum pH for BC and MBC to absorb BPA was 6 and 3, respectively. The concentration of Na+in the range of 0–0.10 mol·L−1can promote the adsorption of BPA to MBC. MBC loaded with γ-Fe2O3not only has excellent magnetic separation ability, but can also reach about 80% of the initial adsorption capacity after four cycles of adsorption. By analyzing the adsorption mechanism, it was found that the H-bond and the π–π electron donor–acceptor interaction (EDA) were the main forces for BC and MBC to adsorb BPA.Keywords:biochar;magnetic biochar;adsorption;bisphenol A;γ-Fe2O3
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
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
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材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Huiping Zeng,Weihua Zhao,Siqi Sun,Xiao Sun,Yuwei Zeng,Ruixia Hao,Jie Zhang,Dong Li
In this study, we demonstrated the effective acquisition of magnetic iron oxide (MIO) for As(V) adsorption by high-temperature pyrolysis of waste iron sludge from the water treatment plant under a confined environment without adding extra chemical reagents. The operating temperature and time in the pyrolysis process were optimized to improve the yield of MIO and its As(V) adsorption capacity. MIO 500 – 2 (500 °C, 2 h) had both relatively high yield and arsenic adsorption efficiency, which was characterized by XRD and XPS as mainly γ-Fe 2 O 3 with small particle size (100–900 nm), significant mesopore (12.43 nm), high specific surface area (65.25 m 2 /g), and effective saturation magnetization intensity (14.45 emu/g). The maximum adsorption capacity was 14.2 ± 0.4 mg/g, and the removal rate could still reach about 80 % after five times of adsorbent regeneration. Considering this facile preparation route and its high yield, large-scale production of MIO from waste iron sludge is feasible, which is expected to provide a low-cost and efficient adsorbent for the treatment of arsenic-containing water in less economically developed areas.
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
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2011
·Vol. 323
·期 23
·3087-3091
·
IF 1.69
L.D. Zhang,W.L. Liu,C.L. Xiao,J.S. Yao,Z.P. Fan,X.L. Sun,X. Zhang,L. Wang,X.Q. Wang
The use of a block copolymer , poly (styrene)-b-poly (acrylic acid) (PS-b-PAA) to prepare a magnetic nanocomposite was investigated. Poly (styrene)-poly ( t -butyl acrylate) block copolymer , being synthesized by atom transfer radical polymerization , was hydrolyzed with hydrochloric acid for obtaining PS-b-PAA. The obtained PS-b-PAA was then compounded with the modified γ-Fe 2 O 3 , and subsequently the magnetic nanocomposite was achieved. The products were characterized by 1 H NMR, FTIR , gel permeation chromatography , thermogravimetric analysis , transmission electron microscopy and vibrating sample magnetometer . The results showed that the nanocomposites exhibited soft magnetism , with the mean diameter of 100 nm approximately.
研究领域:
材料科学
·
高分子化学
·
纳米复合材料
·
磁性材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Shenghong Wang,Changan Zhou,Guoqiang Shu,Yongda Cao,Li Fan,Lei Song,Kui Ma,Hairong Yue
Electrocatalytic water-gas shift reaction (EWGSR) at room temperature and atmospheric pressure is an emerging process for high-pure hydrogen production without an additional H 2 separation procedure. Therefore, developing efficient electrocatalysts of EWGSR is one of the critical factors for its wide applications. Herein, the effects of support and calcinated temperature on the EWGSR performance are highlighted by systematically investigating the Pt/γ-Fe 2 O 3 , Pt/CeO 2 , Pt/TiO 2 , and Pt/α-Fe 2 O 3 catalysts. The results reveal that the γ-Fe 2 O 3 supported Pt catalyst (calcined at 400 °C) exhibits the lowest anodic onset potential and the highest activity compared to these prepared catalysts, and the mass activity is 3.5 times as high as 20% Pt/C. Furthermore, the onset potential for the EWGSR shows a strong correlation with the active O in the amorphous PtOx structures, where the active O atoms can promote the activation of the OH − and reduce the onset potential of the reaction. The significantly enhanced catalytic performance and durability are more responsible for the exposed Pt 0 and the weak adsorption of CO on the Pt/γ-Fe 2 O 3 catalyst. This study provides a new and promising route for designing excellent Pt catalysts for EWGSR in the hope that it can be helpful to the scholars in this orientation.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2020
·
IF 2.213
Xiaolin Li,Yongxing Zhan,Lianghu Su,Yudong Chen,Mei Chen,Longjiang Zhang,Guangyin Zhen,Zhihua Han,Xiaoli Chai
Dark tea-iron nanoparticles (DT-Fe NPs) were prepared using extracts of dark tea leaves as a reducing agent, and further underwent thermal treatment in air. The H2S removal performances of thermal-treated DT-Fe NPs for biogas were further evaluated using a custom-designed fixed-bed reactor (reaction temperature of 250°C, H2S content of 1%). Significant morphology and chemical composition differences were observed when DT-Fe NPs were treated at different temperatures (300–800oC). X-ray diffractometer analysis revealed that a phase transition from γ-Fe2O3 to α-Fe2O3 occurred under heat treatment. When the thermal treatment temperature was 300°C, only α-Fe2O3 was detected. Both α-Fe2O3 and γ-Fe2O3 were present in the sample treated at 400°C. When the thermal treatment temperature was 500–800°C, γ-Fe2O3 in the sample was completely converted to α-Fe2O3. The H2S removal capacity is 14.72 mg H2S/g for DT-Fe NPs without treatment. However, the value increased significantly to 408.30 mg H2S/g after 400°C thermal treatment, which can be explained by the formation of highly active γ-Fe2O3. The reaction product of thermal-treated DT-Fe NPs at 400°C and H2S were further characterized by X-ray diffractometer and X-ray photoelectron spectroscopy. The results showed that it is composed of FeS2 and FeS, in which 72.6% of the sulphur existed as disulphide and 27.4% as monosulphide.
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
CHEMICAL ENGINEERING JOURNAL
·
2011
·
IF 3.074
Longcheng Xu,Jiangdong Dai,Jiangming Pan,Xiuxiu Li,Pengwei Huo,Yongsheng Yan,Xiaobo Zou,Rongxian Zhang
The rattle-type γ-Fe 2 O 3 /mesoporous silica spheres (γ-Fe 2 O 3 /mSiO 2 spheres) were synthesized with a facial and selectively etching strategy. The prepared particles were characterized by FT-IR, XRD , TEM , SEM, VSM, Raman spectroscopy and nitrogen adsorption–desorption analysis, and the results indicated that γ-Fe 2 O 3 /mSiO 2 spheres exhibited magnetic property ( M s = 14.43 emu g −1 ) and composed of mesoporous silica (mean diameter, thickness and pore size was 660 nm, 60 nm, and 2.29 nm, respectively). Then the γ-Fe 2 O 3 /mSiO 2 spheres were employed as sorbents to remove tetracycline (TC) and sulfamethazine (SMZ) in both single and binary aqueous solutions. The adsorption kinetics of γ-Fe 2 O 3 /mSiO 2 spheres were well-described by the pseudo-second-order equation, initial adsorption rate, and half-adsorption time. The Langmuir isotherm model was fitted to the equilibrium data better than that for Freundlich model, and the monolayer adsorption capacity of γ-Fe 2 O 3 /mSiO 2 spheres for TC and SMZ were 0.0791 mmol g −1 and 0.0342 mmol g −1 at 298 K, respectively. In binary systems, SMZ adsorption onto γ-Fe 2 O 3 /mSiO 2 spheres was more affected by the simultaneous presence of competitive antibiotics than that for TC. In addition, the reusability of the material without obviously deterioration in performance was observed at least four repealed cycles.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2020
·Vol. 132
·期 1
·1-9
·
IF 1.406
Ning Wensheng,Li Bei,Dai Hui,Hu Shiye,Yang Xiazhen,Wang Biao,Zhang Bo
Abstract The influences of sugars (sucrose, fructose and glucose) on the performance of FeAl catalysts were investigated for CO 2 hydrogenation. FeAl catalysts were prepared with two steps. At first, the catalyst precursors were obtained by co-precipitation.
During this step, three methods were used to add sucrose into the precursors. Then, promoter K and Cu were impregnated into the precursors. The improved CO 2 conversion and C 5+ hydrocarbon selectivity by sucrose addition were attributed to the formation of γ-Fe 2 O 3 phase in the catalyst precursor, which was different from the popular opinion that sucrose acted as a chelating agent. With the inspiration from sucrose hydrolysis effect, FeAl oxide, mainly in γ-Fe 2 O 3 phase was prepared by adding fructose and glucose (the products of sucrose hydrolysis) into the newly centrifuged precipitate. The formation of γ-Fe 2 O 3 phase was explained based on the results of XRD and XPS. The best catalyst possessed CO 2 conversion of 30.3% and C 5 + selectivity of 52.2% under the reaction conditions of H 2 :CO 2 = 3:1, 6.0 L/(h·g-cat), 1.6 MPa and 235 °C.
Graphic abstract
Effects of fructose and glucose on FeAl catalyst
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）