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Adsorption of phosphate on magnetite-enriched particles (MEP) separated from the mill scale

Muhammad Kashif Shahid, Yunjung Kim, Young-Gyun Choi

《环境科学与工程前沿（英文）》 2019年 第13卷 第5期 doi: 10.1007/s11783-019-1151-2

摘要： MEP were separated from mill scale at low magnetic intensity i.e., 300 to 500 gauss. The phosphate adsorption capacity of MEP was determined 6.41 mg/g. MEP packed-bed columns were successfully regenerated with alkaline solution. Phosphate is a major pollutant in water, causing serious environmental and health consequences. In present study, the phosphate adsorption on novel magnetite-enriched particles (MEP) was comprehensively investigated. A new method and device were introduced for the separation of MEP from the mill scale at low magnetic intensity. Particles were characterized with different techniques such as XRD, XRF, SEM and EDS. The XRD and XRF analysis of MEP identified the dominant existence of crystalline magnetite. Furthermore, the morphological analysis of MEP confirmed the agglomerate porous morphology of magnetite. Oxygen and iron, the main constituents of magnetite were acknowledged during the elemental analysis using EDS. The phosphate adsorption on MEP is well explained using various isotherm and kinetic models, exhibiting the monolayer adsorption of phosphate on the surface of MEP. The maximum adsorption capacity was determined 6.41 mg/g. Based on particle size (45–75 and 75–150 µm) and empty bed contact time (1 and 2 h), four columns were operated for 54 days. MEP were appeared successful to remove all phosphate concentration from the column influent having 2 mg/L concentration. The operated column reactors were successfully regenerated with alkaline solution. The results indicated potential for practical application of the MEP for phosphate removal.

关键词： Adsorption     Magnetite     Mill-scale     Phosphate     Wastewater treatment    

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Nanosized magnetite in low cost materials for remediation of water polluted with toxic metals, azo- and

María Fernanda HORST,Verónica LASSALLE,María Luján FERREIRA

《环境科学与工程前沿（英文）》 2015年 第9卷 第5期   页码 746-769 doi: 10.1007/s11783-015-0814-x

摘要： Nanosized magnetite has emerged as an adsorbent of pollutants in water remediation. Nanoadsorbents include magnetic iron oxide and its modifiers/stabilizers, such as carbon, silica, clay, organic moieties (polymers, aminoacids, and fatty acids) and other inorganic oxides. This review is focused on the recent developments on the synthesis and use of magnetic nanoparticles and nanocomposites in the treatment of contaminated water. The emphasis is on the influence of the iron oxide modifiers on some properties of interest such as size, BET area, and magnetization. The characteristics of these nanomaterials are related to their ability to eliminate heavy metal ions and dyes from wastewater. Comparative analysis of the actual literature was performed aiming to present the magnetic material, its preparation methodology and performance in the elimination of the selected pollutants. Vast information has been properly summarized according to the materials, their properties and preferential affinity for selected contaminants. The mechanisms governing nanomaterial’s formation as well as the interactions with heavy metals and dyes have been carefully analyzed and associated to their efficiency.

关键词： nanomagnetite     water remediation     toxic metals     dyes     supported magnetite    

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Sorption mechanisms of diphenylarsinic acid on natural magnetite and siderite: Evidence from sorption

《环境科学与工程前沿（英文）》 2022年 第16卷 第9期 doi: 10.1007/s11783-022-1547-2

摘要：

• DPAA sorption followed pseudo-secondary and intra-particle diffusion models.

关键词： Diphenylarsinic acid (DPAA)     Sorption     Magnetite     Siderite     Sequential extraction     EXAFS    

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Development of a magnetite-gene complex for gene transfection

Jian XIN BM, Ze-Feng XIA MD, Kai-Xiong TAO MD, Kai-Lin CAI PhD, Gao-Xiong HAN MD, Xiao-Ming SHUAI MD, Ji-Liang WANG MD, Han-Song DU MD, Guo-Bin WANG PhD, Yan LUO MM,

《医学前沿（英文）》 2010年 第4卷 第2期   页码 241-246 doi: 10.1007/s11684-010-0032-7

摘要： The key to successful gene therapy is to find a suitable method and carrier for transfection to allow a gene to be transferred into a cell and integrated into the target gene. The aim of this study was to determine whether biomagnetic material could be combined with the nucleic acid for gene transfection. Dextran-coated iron oxide nanoparticles (DCIONPs) were prepared and mixed with the plasmid pGenesil-1 containing the test gene, which expresses enhanced green fluorescent protein (eGFP). PGenesil-1 empty vector was used as a control. The binding ability was assessed by electrophoresis of the DNA on agarose gels and quantification using BANDSCAN software. Using different gene carriers, Lipofectamine 2000, Sofast, and DCIONPs, the large intestine cancer (Lovo) cell line was transfected with or without a magnetic field. The expression of eGFP was observed by fluorescence microscopy, and the transfection efficiency was compared. The results showed there was a rapid increase in combining rate when the quality ratio of DCIONPs and pGenesil-1 ascended from 1∶1 to 5∶1. However, the combining rate increased less rapidly as the quality ratio continued ascending. The expression of eGFP showed that the early transfection rate could be improved by applying a magnetic field. In conclusion, the DCIONPs we synthesized are able to carry plasmid DNA and enhance the early transfection efficiency when using a magnetic field.

关键词： nanoparticle     magnetite     gene therapy     magnetofection    

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A magnetic adsorbent based on salicylic acid-immobilized magnetite nano-particles for pre-concentration

Hossein Abdolmohammad-Zadeh, Arezu Salimi

《化学科学与工程前沿（英文）》 2021年 第15卷 第2期   页码 450-459 doi: 10.1007/s11705-020-1930-0

摘要： In this research, an eco-friendly magnetic adsorbent based on Fe O /salicylic acid nanocomposite was fabricated using a facile one-pot co-precipitation method. The crystalline and morphological characterization of the prepared nanocomposite was performed by field emission scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The nanocomposite was employed as a magnetic solid-phase extraction agent for separation of Cd(II) ions from synthetic solutions. Some experimental factors affecting the extraction efficiency were investigated and optimized. Following elution with acetic acid (pH 3.5), the pre-concentrated analyte was quantified by flame atomic absorption spectrometry. In optimal conditions, a linear calibration graph was achieved in the concentration range of 0.2‒30 ng·mL with a determination coefficient ( ) of 0.9953. The detection limit, the enhancement factor, inter- and intra-day relative standard deviations (for six consecutive extractions at the concentration level of 10 ng·mL ) were 0.04 ng·mL , 100, 2.38% and 1.52%, respectively. To evaluate the accuracy of the method, a certified reference material (NIST SRM 1643e) was analyzed, and there was a good agreement between the certified and the measured values. It was successfully utilized to determine cadmium in industrial wastewater samples and the attained relative recovery values were between 96.8% and 103.2%.

关键词： cadmium     magnetic solid-phase extraction     Fe3O4 nanoparticles     Fe3O4/salicylic acid nanocomposite     flame atomic absorption spectrometry    

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Coextraction of vanadium and manganese from high-manganese containing vanadium wastewater by a solvent extraction-precipitation process

Zishuai Liu, Yimin Zhang, Zilin Dai, Jing Huang, Cong Liu

《化学科学与工程前沿（英文）》 2020年 第14卷 第5期   页码 902-912 doi: 10.1007/s11705-019-1887-z

摘要： High-manganese containing vanadium wastewater (HMVW) is commonly produced during the vanadium extraction process from vanadium titano-magnetite. HMVW cannot be reused and discharged directly, and is harmful to the environment and affect product quality due to heavy metals in the wastewater. The wastewater is usually treated by lime neutralization, but valuable metals (especially V and Mn) cannot be recovered. In this study, an efficient and environmentally friendly method was developed to recover valuable metals by using a solvent extraction-precipitation process. In the solvent extraction process, 98.15% of vanadium was recovered, and the V O product, with a purity of 98.60%, was obtained under optimal conditions. For the precipitation process, 91.05% of manganese was recovered as MnCO which meets the III grade standard of HG/T 2836-2011. Thermodynamic simulation analysis indicated that MnCO was selectively precipitated at pH 6.5 while Mg and Ca could hardly be precipitated. The results of X-ray diffraction and scanning electron microscopy demonstrated that the obtained V O and MnCO displayed a good degree of crystallinity. The treated wastewater can be returned for leaching, and resources (V and Mn) in the wastewater were utilized efficiently in an environmentally friendly way. Therefore, this study provides a novel method for the coextraction of V and Mn from HMVW.

关键词： high-manganese containing vanadium wastewater     solvent extraction     carbonate precipitation     vanadium titano-magnetite     valuable metal recovery    

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Catalytic oxidation of CO over Pt/Fe

Zihao Li, Yang Geng, Lei Ma, Xiaoyin Chen, Junhua Li, Huazhen Chang, Johannes W. Schwank

《环境科学与工程前沿（英文）》 2020年 第14卷 第4期 doi: 10.1007/s11783-020-1244-y

摘要： Abstract • Strong metal-support interaction exists on Pt/Fe3O4 catalysts. • Pt metal particles facilitate the formation of oxygen vacancies on Fe3O4. • Fe3O4 supports enhance the strength of CO adsorption on Pt metal particles. The self-inhibition behavior due to CO poisoning on Pt metal particles strongly impairs the performance of CO oxidation. It is an effective method to use reducible metal oxides for supporting Pt metal particles to avoid self-inhibition and to improve catalytic performance. In this work, we used in situ reductions of chloroplatinic acid on commercial Fe3O4 powder to prepare heterogeneous-structured Pt/Fe3O4 catalysts in the solution of ethylene glycol. The heterogeneous Pt/Fe3O4 catalysts achieved a better catalytic performance of CO oxidation compared with the Fe3O4 powder. The temperatures of 50% and 90% CO conversion were achieved above 260°C and 290°C at Pt/Fe3O4, respectively. However, they are accomplished on Fe3O4 at temperatures higher than 310°C. XRD, XPS, and H2-TPR results confirmed that the metallic Pt atoms have a strong synergistic interaction with the Fe3O4 supports. TGA results and transient DRIFTS results proved that the Pt metal particles facilitate the release of lattice oxygen and the formation of oxygen vacancies on Fe3O4. The combined results of O2-TPD and DRIFTS indicated that the activation step of oxygen molecules at surface oxygen vacancies could potentially be the rate-determining step of the catalytic CO oxidation at Pt/Fe3O4 catalysts. The reaction pathway involves a Pt-assisted Mars-van Krevelen (MvK) mechanism.

关键词： Strong metal-support interaction (SMSI)     Surface oxygen vacancy     Lattice oxygen     Magnetite     Platinum metals    

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标题 作者 时间 类型 操作

Adsorption of phosphate on magnetite-enriched particles (MEP) separated from the mill scale

Muhammad Kashif Shahid, Yunjung Kim, Young-Gyun Choi

期刊论文

Nanosized magnetite in low cost materials for remediation of water polluted with toxic metals, azo- and

María Fernanda HORST,Verónica LASSALLE,María Luján FERREIRA

期刊论文

Sorption mechanisms of diphenylarsinic acid on natural magnetite and siderite: Evidence from sorption

期刊论文

Development of a magnetite-gene complex for gene transfection

Jian XIN BM, Ze-Feng XIA MD, Kai-Xiong TAO MD, Kai-Lin CAI PhD, Gao-Xiong HAN MD, Xiao-Ming SHUAI MD, Ji-Liang WANG MD, Han-Song DU MD, Guo-Bin WANG PhD, Yan LUO MM,

期刊论文

A magnetic adsorbent based on salicylic acid-immobilized magnetite nano-particles for pre-concentration

Hossein Abdolmohammad-Zadeh, Arezu Salimi

期刊论文

Coextraction of vanadium and manganese from high-manganese containing vanadium wastewater by a solvent extraction-precipitation process

Zishuai Liu, Yimin Zhang, Zilin Dai, Jing Huang, Cong Liu

期刊论文

Catalytic oxidation of CO over Pt/Fe

Zihao Li, Yang Geng, Lei Ma, Xiaoyin Chen, Junhua Li, Huazhen Chang, Johannes W. Schwank

期刊论文