JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2015
·Vol. 91
·期 4
·985-993
·
IF 2.349
Jiang Lu,Xiaodan Wei,Yu Chang,Shuanghong Tian,Ya Xiong
BACKGROUND An ozonation catalyst needs to be recycled easily and to exhibit high activity in view of its practical application in wastewater treatment. In this study, magnetic mesoporous MgFe 2 O 4 was successfully prepared and used as a new ozonation catalyst for degradation of Acid Orange II (AOII). The role of Mg in MgFe 2 O 4 was revealed to explain the high activity by catalytic experiments and XPS analysis. RESULTS The degradation efficiency of AOII in the MgFe 2 O 4 /O 3 process exceeds 90% over a wide pH range of 4.6–9.6, slightly affected by the solution pH. The catalytic activity of MgFe 2 O 4 is much higher than that of MgO, Fe 2 O 3 and also their mixture (MgO+Fe 2 O 3 ) with identical molar ratio of Mg 2+ to Fe 3+ , indicating the first role of Mg, i.e. coupling with Fe to present a synergistically catalytic effect. Furthermore, MgFe 2 O 4 possesses a reaction rate constant at least 2.3 times that of NiFe 2 O 4 , MnFe 2 O 4 , and CuFe 2 O 4 . It illustrates the second role of Mg, i.e. causing the high electron density on lattice oxygen in MgFe 2 O 4 indicated by XPS and thus favoring activation of the electrophilic ozone. CONCLUSIONS This study demonstrated the easy recycling and high activity of MgFe 2 O 4 in catalytic ozonation, and revealed the role of Mg in MgFe 2 O 4 . © 2015 Society of Chemical Industry
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yutong Li,Xiaoxiao Ma,Yile Du,Shuangli Chen,Pingping Wu,Sijing Zhang
The immobilization of cadmium in soil to reduce its bioavailability is a common approach in soil remediation . However, fluctuations in soil pH, redox potential , and microbial activity can still lead to cadmium release. To address this challenge, MgFe 2 O 4 /chitosan carbon aerogel beads (MCSCA) were synthesized for in-situ remediation to remove Cd from the soil. A two-week remediation period was conducted to assess the effectiveness of MCSCA in Cd-contaminated soil. Different proportions (1%, 2%, and 3% by soil weight) of MCSCA were incorporated into the soil for remediation, followed by MCSCA separation through water flotation . The results demonstrated that after three remediation cycles, 55.46%, 72.27%, and 75.70% of the total cadmium were removed by 1%, 2%, and 3% MCSCA additions, respectively, corresponding to the removal of 76.51%, 87.39%, and 90.28% of bioavailable cadmium. Regeneration of MCSCA was accomplished using 0.1 M HCl , achieving cadmium desorption rates of 97.14%, 96.43%, and 90.48% for 1%, 2%, and 3% MCSCA additions, respectively. The regenerated MCSCA maintained higher remediation efficiency, removing 62.72%, 75.20%, and 80.96% of bioavailable cadmium even after three cycles, with MCSCA recovery rates of 94.40%, 92.30%, and 91.40%, respectively. In a pot experiment, pakchoi plants grown in soil post three rounds of remediation with different ratios (1%, 2%, and 3%) of MCSCA xhibited reductions in total cadmium content by 44.75%, 59.38%, and 69.88%, respectively, compared to plants grown in Cd-contaminated soil. In summary, this study underscores the effectiveness of MCSCA in remediating Cd-contaminated soils, offering a promising approach for soil remediation.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 47
·58109-58118
·
IF 0
Kong Dehui,Wu Jinxiong,Yan Xiuling,Zhang Heng,Iqbal Azhar,Ivanets Andrei,Romanovski Valentin,Zhang Lijuan,Su Xintai
The utilization of electroplating sludge (ES) to derive metal oxide functional materials is a key strategy, as it enables the recycling of valuable elements, mitigates environmental risks, and aligns with green, low-carbon development strategies. Nevertheless, the development of metal oxide composite functional materials with distinctive structures and properties derived from ES continues to present several challenges. Herein, we synthesized CuFe 2 O 4 /MgFe 2 O 4 metal oxide composites from ES by one-step hydrothermal method. As-obtained CuFe 2 O 4 /MgFe 2 O 4 metal oxide composites (MMOs) have a unique layered structure, richer mesoporous and microporous structures, activity sites. When evaluated as an adsorbent for Congo red (CR), as-synthesized CuFe 2 O 4 /MgFe 2 O 4 with layered structure composite exhibited excellent adsorption capacity (1039.1 mg/g) and reusability (85.55% after five cycles), which was superior to most similar adsorbents reported till date. Such improvement is explored to mainly originate from two respects: the physical adsorption facilitated by the abundant pores formed through the stacking and growth of CuFe 2 O 4 and MgFe 2 O 4 , and the chemisorption resulting from surface complexation and hydrogen bonding between the MMOs and CR. This strategy to directly transform ES into functional materials shows great promise both in waste management and preparation of robust adsorbents for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
NEW JOURNAL OF CHEMISTRY
·
2025
·Vol. 49
·期 9
·3783-3794
·
IF 2.5
Yan He,Tong Liu,Yuehua Deng
In this study, sugarcane bagasse biochar (SBBC) and its MgFe2O4 modified composites with different MgFe2O4/SBBC mass ratios were fabricated to remove norfloxacin (NOR) from aqueous solutions. The results showed that MgFe2O4@SBBC (1 : 2) prepared via impregnation coprecipitation exhibited excellent adsorption performance and environmental friendliness. The increased surface area, improved pore structure, abundant surface functional groups, and decreased pHpzc endowed MgFe2O4@SBBC (1 : 2) with a higher adsorption efficiency (16.9 mg g−1, 84.3%) than that of SBBC (9.76 mg g−1, 48.8%). The pseudo-second-order model better described the kinetic process, indicating that chemisorption mainly occurred on both biochars. Isotherm fitting results indicated that NOR was adsorbed on SBBC primarily by multilayer adsorption, whereas monolayer adsorption was observed for MgFe2O4@SBBC (1 : 2). The adsorption of NOR onto both biochars was spontaneous, endothermic, and highly pH-dependent. Combined with BET, FTIR and XPS results, NOR adsorption by SBBC was controlled by pore filling, hydrogen bonds, and π–π electron donor acceptor interactions. In addition to these mechanisms, electrostatic attraction and surface complexation jointly strengthened the adsorption capacity of MgFe2O4@SBBC (1 : 2).
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zijian Liao,Mingliang Ma,Yuxin Bi,Zhouyu Tong,Kwok L. Chung,Zijian Li,Yong Ma,Binglong Gao,Zhengkai Cao,Ranran Sun,Xiang Zhong
Advanced microwave absorption (MA) materials have attracted widespread attention to meet the challenges of electromagnetic (EM) pollution. Herein, MgFe 2 O 4 /MgO/C fibers were successfully prepared via electrospinning technology and carbonization , and their surfaces were coated by MoS 2 via hydrothermal method . The EM wave absorption performance of composites was enhanced due to the introduction of MoS 2 . The results showed that the EM wave absorption performance of MgFe 2 O 4 /MgO/C could not meet the requirements due to low dielectric loss and poor impedance matching. The performance of the composites was improved after coating of MoS 2 , which showed the strong wave absorption capability and the broad absorption bandwidth. The optimal reflection loss (RL) is −56.94 dB at 9.5 GHz and the effective absorption bandwidth is 3.9 GHz (8.08–11.98 GHz) with a thickness of 2.7 mm. The excellent MA performance can be mainly attributed to excellent synergistic effect between MgFe 2 O 4 /MgO/C and MoS 2 . Furthermore, MoS 2 also contributes to dielectric loss and ideal impedance matching. MgFe 2 O 4 /MgO/C@MoS 2 composites may be utilized for lightweight and high-efficient MA materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Yi Yuan,Lijia Huang,Murat Yılmaz,Tian C. Zhang,Yuan Wang,Shaojun Yuan
To improve their low-temperature desulfurization performance, the activated carbon-based materials have typically been modified by either metal oxide loading or nitrogen doping. However, most of the aforementioned materials are limited to only one of the above modification methods, resulting in relatively poor desulfurization performance. Herein, a novel MgFe 2 O 4 -loaded N -doped biochar (MgFe 2 O 4 @NBC) was fabricated by one-pot pyrolysis of a nitrogen containing precursor of g-C 3 N 4 , cooked rice waste, and metal salts for efficient low-temperature desulfurization of H 2 S. Different fabrication conditions such as pyrolysis temperature and the nitrogen mixing ratio (i.e., the mass ratio of cooked rice waste to g-C 3 N 4 ) have been extensively studied. The optimized MgFe 2 O 4 @NBC-500–2 sample delivered a superior breakthrough capacity of 1052.83 mg/g in an atmosphere of O 2 content of 20% and relative humidity of 80% at 25 °C, and demonstrated high tolerance and stability of desulfurization performance to harsh environmental conditions with 80% relative humidity and no oxygen. The desulfurization mechanism of H 2 S on the surfaces of the MgFe 2 O 4 @NBC composites was attributed to the synergistic effects of reactive adsorption and catalytic oxidation process. The composite also demonstrated excellent reusability, retaining 85% of the initial breakthrough capacity after 5 recycled uses. Therefore, the as-prepared MgFe 2 O 4 @NBC composite offers a potentially promising carbon-based desulfurizers for practical applications in the low-temperature desulfurization field.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 13
·2538-2546
·
IF 3.545
Min Yang,Guangshe Li,Huixia Li,Junfang Ding,Yan Wang,Liping Li
Manipulating the growth behavior of nano-sized supports is proved to have extremely favorable effects for optimizing the performance of hybrid catalysts. Herein, we investigated the growth kinetics of MgFe2O4 and revealed its size-dependent behavior of Fe occupancies at octahedral and tetrahedral sites and CO oxidation catalytic activity for the first time. MgFe2O4, with particle size ranging from 8.1 nm to 190.0 nm, was prepared via a sol–gel method after post-annealing treatment at a temperature from 400 °C to 1000 °C. The growth of MgFe2O4 nanoparticles obeys the Ostwald ripening mechanism with the quantitative formula D5 = 2.08 × 1014t exp(−122.13/RT). The systematic characteristics show that the redox behavior and O2 activation of hybrid catalysts of Pt/MgFe2O4-T rely on the grain size of MgFe2O4 nanoparticles. The Pt/MgFe2O4-500 catalyst with a support size of 20.6 nm exhibits a remarkable CO oxidation performance due to its abundant chemisorbed oxygen species on the surface and enhanced metal–support interactions among all examined catalysts. Our findings offer significant insight into the size-dependent structure, redox ability and oxygen activation properties of spinel materials and can greatly impact future exploration of novel materials in heterogeneous catalysis.
研究领域:
催化化学
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材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Ling-Ling He,Jing-Yi Bai,Xiao-Yan Li,Shuang Qi,Song Li,Xin Wang
A series of BiOBr/MgFe 2 O 4 composites were synthesized and characterized. Tetracycline (TET) was used as a model antibiotic to verify the sonocatalytic activities of these BiOBr/MgFe 2 O 4 composites. When the mass ratio of BiOBr to MgFe 2 O 4 in the BiOBr/MgFe 2 O 4 composites was 20%, the BiOBr/MgFe 2 O 4 composite (BM-20) showed the best catalytic performance to the sonocatalytic removal of TET. Under the optimum conditions, such as the addition of catalyst 2.0 g/L, pH 7 and ultrasonic power 500 W, the initial concentration of TET 10 mg/L, the sonocatalytic removal rate of TET reached 91.10±2.36% in 30 min using BM-20 as a sonocatalyst, which was significantly better than that of MgFe 2 O 4 (52.3±2.23%). The generated hydroxyl free radicals (•OH), holes ( h + ) and superoxide anion radical (•O 2 − ) played major roles in the sonocatalytic removal process. The improved sonocatalytic performance of BM-20 was due to the S-scheme heterojunction formed between BiOBr and MgFe 2 O 4 , which could separate electron-hole ( e − -h + ) pairs effectively. Besides, BM-20 had great stability and reusability. To conclude, the fabrication of heterojunction was an effective method to improve the sonocatalytic performance of catalyst. The BiOBr/MgFe 2 O 4 composites could be satisfactory utilized as a catalyst in the sonocatalytic elimination of organic contaminant.
研究领域:
环境科学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Huairu Tian,Jun Peng,Tingting Lv,Chen Sun,Hua He
In present study, a stable and magnetic metal-organic framework (MOF) material was synthesized by simple solvothermal method as adsorbent to rapid removal of two organic dyes, the Rhodamine B (RB) and Rhodamine 6G (Rh6G), in water samples. The prepared material showed great characteristics of large surface area (519.86 m 2 g −1 ), excellent magnetic responsivity (35.00 emu g −1 ) and rapid removal (within 5 min). Maximum adsorption capacities of the magnetic material toward RB and Rh6G were up to 219.78 and 306.75 mg g −1 , respectively. Adsorption kinetics suggested the adsorption process met the pseudo-second-order kinetic model. The prepared material could be reused at least 10 times by washing with acetonitrile solution, the relative standard deviation (RSD) of these ten cycles removal efficiency was 4.8%. In conclusion, good chemical inertness, a mechanical/water stability and super-hydrophilicity feature made this MOF a promising adsorbent for targets removal from environmental water sample.
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
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Yonghao Wang,Liting Ling,Zhenghao Lu,Ming Zhou,Xiaomei Zheng,Yongjing Wang
Spinel-structured materials are considered promising electrocatalysts for environmental remediation, yet their mechanisms in the electrocatalytic reduction of O2 to H2O2 and the activation of H2O2 remain poorly understood. Herein, we synthesized a novel MgFe2O4/carbon nanotube (CNT) composite via a hydrothermal method and systemically investigated its electrocatalytic performance in the degradation of phenol through the in situ electrocatalytic-reduction of O2 to H2O2 and activation to ˙OH. The composite exhibited exceptional catalytic activity, achieving 99% phenol degradation within 30 minutes under optimized conditions (MgFe2O4/CNT mass ratio of 10 : 1, applied voltage of −0.9 V, pH 3, and catalyst loading of 0.44 mg cm−2). Moreover, the total organic carbon (TOC) reached 78.6% in 90 minutes, with the catalyst maintaining 91.4% efficiency after four recycling experiments. Mechanistic studies using XPS and control experiments indicate that introducing CNTs considerably improves electron transfer and enriches active oxygen and defect degrees. Importantly, abundant defects and active oxygen species facilitate the generation of H2O2 and dominate the conversion of H2O2 into ˙OH by heterogeneous activation for MgFe2O4/CNT, while MgFe2O4 mainly depends on homogeneous activation. This work offers a significant case for the degradation of organic contaminants utilizing spinel-structured electrocatalysts.
研究领域:
环境催化
·
电化学
·
材料科学
·
环境修复
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LOW TEMPERATURE PHYSICS
·
2022
·Vol. 209
·期 1
·166-181
·
IF 1.618
Shen JiYu,Mo JiaJun,Tao YuChen,Xia YanFang,Liu Min
The study of spinel ferrite ion sites is an important aspect to optimize its structure. In this report, homogeneous and stable mixed spinels CoFe 2 O 4 and MgFe 2 O 4 were synthesized by a simple sol–gel combustion method. The Curie temperature is higher than 400 K, so the Mössbauer spectrum at room temperature shows a typical magnetically ordered Zeeman sextet. The change in the hyperfine magnetic field is consistent with the change in the saturation magnetization, which can be explained by the change in the superexchange contribution between each point. The frozen magnetic moment at low temperature makes CoFe 2 O 4 appear partly independent of antiferromagnetic domain contribution. The competitive ability of the ion to the B site is Mg 2+ > Co 2+ > Fe 3+ , which will provide some guidance for the structural optimization of spinel ferrite.
研究领域:
材料科学
·
磁学
✓ 已验证
DOI
高影响因子
Minerals
·
2023
·Vol. 13
·期 3
·452
·
IF 2.5
Rui Chen,Lin Shi,Haoyong Huang,Jie Yuan
Red mud, which could cause numerous problems to the environment, is a hazardous waste generated from the alumina smelting industry. In general, the storage and harmless utilization of red mud are hard to implement due to its fine particle size and high alkalinity. This study put forward a novel process to separate iron (MgFe2O4) and alumina (Al2O3) in red mud by a magnetization sintering method. The magnesium oxide was added to transform the nonmagnetic Fe2O3into magnetic MgFe2O4to achieve physical separation of iron-bearing minerals, and the alumina-bearing minerals were converted into dissoluble NaAlO2minerals in a one-step reaction. The atmospheric pressure leaching process was adopted in this study for alumina resource recovery. To achieve clean alumina production, the silicate in the leaching solution was removed by adding the slightly soluble CaSO4, and the entire process becomes clean and harmless. The feasibility of the process was verified by thermodynamic analysis, and a series of experiments were performed to detect the optimum MgO/(Fe2O3+ MgO) ratio and the calcining and leaching conditions. The morphological and mineralogical characteristics of modified red mud, leaching red mud, and magnetic separation product were studied by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) energy dispersive spectroscopy (EDS). It was observed that under the optimal conditions with MgO/(Fe2O3+ MgO) of 14.89% to recover iron and aluminum, the corresponding recovery rates were 67.54% and 73.01% respectively, and the iron grade was 30.46%. The EDS results showed that the obtained Mg/Fe ratio of the magnetic separation product was 0.4677–0.528, which is slightly different from that of the standard MgFe2O4at 0.5. This new method can promote the development of comprehensive utilization of red mud and iron production.Keywords:red mud;harmless utilization;mineralogical analysis;MgFe2O4;leaching parameter
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
危险品化学品经营许可证（带存储）