Materials
·
2023
·Vol. 16
·期 24
·7636
·
IF 3.4
Binxian Gu,Haijie Zhang,Meng Ye,Ting Zhou,Jianjian Yi,Qingsong Hu
As a kind of emerging contaminant, organoarsenic compounds have drawn wide concern because of their considerable solubilities in water, and the highly toxic inorganic arsenic species formed during their biotic and abiotic degradation in the natural environment. Thus, the effective removal and studying of the adsorption mechanism of organoarsenic compounds are of significant urgency. In this work, MnFe2O4and MnFe2O4/graphene were prepared through a facile solvothermal method. From the results of the Transmission Electron Microscope (TEM) characterization, it can be found that MnFe2O4nanoparticles were uniformly distributed on the surface of the graphene. And the specific surface area of the MnFe2O4/graphene was about 146.39 m2g−1, much higher than that of the MnFe2O4(86.15 m2g−1). The interactions between organoarsenic compounds and adsorbents were conducted to study their adsorption behavior and mechanism. The maximum adsorption capacities of MnFe2O4/graphene towards p-arsanilic acid (p-ASA) and roxarsone (ROX) were calculated to be 22.75 and 30.59 mg g−1. Additionally, the ionic strength, negative ions, and humus were introduced to investigate the adsorption performance of organoarsenic compounds. Electrostatic adsorption and surface complexation are the primary adsorption mechanisms on account of X-ray photoelectron spectroscopy (XPS) and the Fourier-transform infrared spectroscopy (FT-IR) analysis. This research extends the knowledge into studying the interaction between organoarsenic species and hybrid nanomaterials in the natural environment.Keywords:MnFe2O4;graphene;adsorption;p-arsanilic acid;roxarsone
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Hongtao Wei,Tianxiao Peng,Bingxing Wang,Yongcai Zhang
MnFe 2 O 4 is a potential magnetic visible-light photocatalyst , but its photocatalytic efficiency is badly restricted by the high recombination rate of its photogenerated electrons and holes. This work used conjugated polyvinyl chloride derivative (CPVC) to couple MnFe 2 O 4 to boost its photocatalytic efficiency. CPVC/MnFe 2 O 4 nanocomposites with an n-p heterojunction structure were prepared by an easily implementable three-step approach. When applied to the photocatalytic reduction of aqueous hexavalent chromium (Cr(VI)) with the help of visible-light (λ > 420 nm), the CPVC/MnFe 2 O 4 nanocomposite synthesized under the optimized conditions (CPVC/MnFe 2 O 4 -2) demonstrated not only superior photocatalytic activity than MnFe 2 O 4 nanoparticles and many other recently reported visible-light photocatalysts, but also remarkable durability. In addition, CPVC/MnFe 2 O 4 -2 also had strong magnetism and could be effectively separated from the solution by attraction with a magnet. According to the results of structure and photoelectrochemical characterization, the superior photocatalytic activity of CPVC/MnFe 2 O 4 -2 largely results from its bigger specific surface area and improved photogenerated charge separation and transfer capability. This work suggests that a new cost-effective, efficient and magnetically recoverable visible-light photocatalyst may be developed by coupling MnFe 2 O 4 with CPVC.
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RSC Advances
·
2021
·Vol. 11
·期 45
·28375-28380
·
IF 3.361
Ke Liu,Jiaxing Su,Jiangong Liang,Yuan Wu
Mesoporous MnFe2O4 magnetic nanoparticles (mMnFe2O4 MNPs) were prepared with a one-step synthesis method and characterized to possess intrinsic peroxidase-like activity, and had obvious advantages over other peroxidase nanozymes in terms of high catalytic affinity, high stability, mono-dispersion, easy preparation, and quick separation. The mMnFe2O4 MNPs were used as a colorimetric sensor for indirect sensing of urine glucose based on the sensing principle that H2O2 can be produced from glucose oxidation catalyzed by glucose oxidase (GOx), and under the catalysis of the mMnFe2O4 MNPs nanozyme, H2O2 can oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue color in a few minutes. This sensor is simple, cheap, sensitive, and specific to glucose detection with a detection limit of 0.7 μM, suggesting its potential for on-site glucose detection.
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 5
·1276
·
IF 5.076
Qian Li,Xiaoyu Jiang,Yongfu Lian
The MnFe2O4/BGA (boron-doped graphene aerogel) composite was prepared by hydrothermal treatment of MnFe2O4particles, boric acid, and graphene oxide. When applied as a photo-Fenton catalyst for the degradation of rhodamine B, the MnFe2O4/BGA composite yielded a degradation efficiency much higher than the sum of those of individual MnFe2O4and BGA under identical experimental conditions, indicating a strong synergetic effect established between MnFe2O4and BGA. The catalytic degradation of rhodamine B was proved to follow pseudo first-order kinetics, and the apparent reaction rate constant on the MnFe2O4/BGA composite was calculated to be three- and seven-fold that on BGA and MnFe2O4, respectively. Moreover, the MnFe2O4/BGA composite also demonstrated good reusability and could be reused for four cycles without obvious loss of photocatalytic activity.Keywords:manganese ferrite;boron-doped graphene aerogel;degrading efficiency
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Quan Chen,Peng Yi,Wei Dong,Yihui Chen,Liping He,Bo Pan
The discharge and consequent occurrence of antibiotics in the environment has led to increasing concerns because their presence can promote the development of resistance genes, which in turn pose a significant health risk. A key process to control the transport and risk of antibiotics is adsorption. Thus, we investigated the adsorption mechanisms of six typical antibiotics onto a MnFe 2 O 4 @cellulose activated carbon (CAC) hybrid combining batch adsorption experiments and quantum chemical calculations. In the single-adsorbate adsorption systems, the solid-phase concentrations of the adsorbates varied from 152.8 to 395.7 mg/g, which were dependent on the adsorption affinity and molecular structures or sizes of the antibiotics. Chemisorption was the main adsorption mechanism, and it was driven by p-d electronic conjugation and cation-π interactions. In the competitive adsorption systems, the solid-phase concentrations of both primary (sulfamethazine, SMT) and secondary (the other five antibiotics) adsorbates decreased significantly. The decrease ratio of SMT varied from 15.42% to 67.28% while that of the secondary adsorbates varied from 14.13% to 52.74%. The “competition” strength was depended on the adsorption energy and the overlapping of adsorption sites. We believe that these findings will provide a better understanding of the adsorption characteristics of typical antibiotics and facilitate the strategy developing for the removal of antibiotics from the aqueous phase.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jing Wang,Min Yue,Yuze Han,Xing Xu,Qinyan Yue,Shiping Xu
The g-C 3 N 4 /MnFe 2 O 4 as recyclable catalyst was synthesized via auto-combustion sol-gel method. Peroxymonosulfate (PMS) activation by the catalyst for triclosan (TCS) degradation was investigated considering the activation performance, reaction parameters and activation mechanism. The catalyst prepared with 1:1 of g-C 3 N 4 and MnFe 2 O 4 molar ratio performed the best catalytic activity in the TCS degradation and with lest metal leaching. The concentration of Cl − showed a dual effect on the TCS degradation, while HCO 3 − and SO 4 2− performed inhibitory effect. Sulfate radicals, hydroxyl radicals, superoxide and non-radical single oxygen contributed to the degradation of TCS. Compared with MnFe 2 O 4 /PMS system, few heavy metals were leached from g-C 3 N 4 /MnFe 2 O 4 (1:1)-PMS after each reuse ( Fig. S6 b), suggesting that g-C 3 N 4 was conducive to the stability of g-C 3 N 4 /MnFe 2 O 4 (1:1) catalyst. Dichlorination, hydroxylation, cyclization and other bond breaking reaction were inferred as the TCS degradation pathways. These results demonstrated that g-C 3 N 4 /MnFe 2 O 4 (1:1) was a highly effective and stable catalyst for PMS activation to treat toxic organic pollutants in water.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Shuyi Huang,Shibo Jiang,Hongwei Pang,Tao Wen,Abdullah M. Asiri,Khalid A. Alamry,Ahmed Alsaedi,Xiangke Wang,Suhua Wang
Magnetic nanomaterials are promising adsorbents for their superior performance in the elimination of radioactive ions from aqueous solution. In this study, a new kind of fluorescent carbon dots were successfully introduced into MnFe 2 O 4 to fabricate magnetic polyethyleneimine-functionalized carbon quantum dots/MnFe 2 O 4 (PECQDs/MnFe 2 O 4 ) nanocomposites by a simple hydrothermal method, which combined the fluorescent characteristic of CQDs, adsorption capacity of polyethyleneimine and magnetic separation property of MnFe 2 O 4 . Detailed characterization certified the formation of nanohybrid composites and its integrating advantages of fluorescence property and magnetism separation, which demonstrated its potential in immobilizing U(VI) and monitoring the adsorption process simultaneously in wastewater. The obtained PECQDs/MnFe 2 O 4 was applied to remove U(VI) from aqueous solution and showed superior construction stability and adsorption capacity of 194 mg/g. Moreover, the kinetic and thermodynamic results suggested that the immobilization of U(VI) was an endothermic and spontaneous multilayer adsorption dominated process. In the end, the cation exchange and interaction between uranyl ions and abundant functional groups (i.e., NH 2 , OH and COOH) on PECQDs/MnFe 2 O 4 were revealed to be responsible for the enhanced adsorption of U(VI), which was realized by forming outer-sphere surface complexes in the removal process. This study proposed an ultrafast-kinetics and high-efficiency adsorbent for U(VI) sequestration, which has a great application potential due to its outstanding recycling performance.
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CELLULOSE
·
2017
·Vol. 25
·期 1
·735-751
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IF 3.417
Cui Sheng,Wang Xue,Zhang Xin,Xia Wei,Tang Xianglong,Lin Benlan,Wu Qi,Zhang Xin,Shen Xiaodong
In this paper, a MnFe 2 O 4 -Cellulose magnetic composite aerogel (MnCA) with high adsorption capacity was fabricated by in situ incorporating MnFe 2 O 4 to regenerated cellulose hydrogel matrix, followed by CO 2 supercritical drying. A green synthetic strategy was performed by using renewable cellulose materials, environmentally benign cellulose solvents and facile synthetic conditions. The results showed that the obtained magnetic cellulose aerogel had a continuous and tiered three dimensional network with interconnected fibrils of about 30 nm in width, which was similar to those of cellulose aerogel prepared from NaOH/urea solution via CO 2 supercritical drying. Meanwhile, they had high specific surface areas of 236–288 m 2 /g and total pore volume of 0.55–0.88 cm 3 /g. In addition, the hybrid aerogel showed superparamagnetism with maximum saturation magnetization reaching up to 18.53 emu/g. The magnetic nanocomposite aerogel could be used for biological and environmental applications. The adsorption test showed that MnCA had rapid adsorption rate and excellent adsorption ability of removing heavy metal ions in aqueous solution which could attain to 63.3 mg/g within 100 min. Moreover, all the composite aerogels exhibited good reusability and could be easily reused from the water after adsorption.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
吸附技术
·
化学工程
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WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 236
·期 1
·1-16
·
IF 3.8
Zheng Lijia,Cao Shoutao,Tang Meng,Ge Ming
A solvothermal route was used to synthesize manganese ferrite/multi-wall carbon nanotubes (MnFe 2 O 4 /MWCNT) composite catalyst, which was firstly employed to activate peroxymonosulfate (PMS) to eliminate rhodamine B (RhB) from water. The catalytic activity of the as-obtained MnFe 2 O 4 /MWCNT for PMS activation and RhB degradation was higher than that of MnFe 2 O 4 and MWCNT. The optimal MnFe 2 O 4 /MWCNT-10 catalyst (0.3 g/L) can remove 98.1% of RhB (20 mg/L) from water by activating PMS (1.0 g/L) after 100 min of reaction, and this catalyst remained stable in the oxidation process. Quenching experiments, X-ray photoelectron spectroscopy (XPS) and electrochemical analysis demonstrated that RhB elimination in the MnFe 2 O 4 /MWCNT-PMS system was accomplished by the non-radical ( 1 O 2 and electron transfer) and free radical (O 2 •− , SO 4 •‒ and •OH) oxidation pathways, and 1 O 2 played a leading role. The influence of operational factors (PMS dosage, initial solution pH, catalyst dosage, reaction temperature, common inorganic anions and water matrix) on RhB removal by MnFe 2 O 4 /MWCNT-10 activated PMS was investigated in detail. The presence of Cl ‒ ions significantly boosted RhB degradation due to the production of more 1 O 2 .
研究领域:
环境科学
·
材料科学
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Journal of Nanomaterials
·
2016
·
IF 1.758
Lina Song,Changzhi Yan,Wei Zhang,Haoan Wu,Zhengyang Jia,Ming Ma,Jun Xie,Ning Gu,Yu Zhang
This study reports the synthesis of three kinds of manganese-doped magnetic ferrite nanoparticles (MnFe2O4) in benzyl ether, octyl ether, and 1-octadecene by a simple and low cost thermal decomposition method. It was found that benzyl ether results in a dramatic improvement in nanoparticle crystallinity owing to its stronger reducibility compared to octyl ether and 1-octadecene, as demonstrated by X-ray diffraction and TEM measurements. Raman spectroscopy detection also indicated that the reducing solvent of benzyl ether was in favor of forming magnetite-like structure ferrite, while maghemite-like structured ferrite was obtained in octyl ether and 1-octadecene. The saturation magnetization () of MnFe2O4 synthesized in benzyl ether was 85 emu/g [Fe], which was 3 and 5 times larger than MnFe2O4 synthesized in octyl ether and 1-octadecene, respectively. The specific absorption rate (SAR) of MnFe2O4 nanoparticles synthesized in benzyl ether was 574 W/g, while MnFe2O4 nanoparticles synthesized in octyl ether and 1-octadecene have had much smaller SAR of 76 and 33 W/g, respectively. MnFe2O4 nanoparticles synthesized in benzyl ether also exhibit higher relaxivity ( mM−1 s−1) than those synthesized in octyl ether and 1-octadecene ( and 22 mM−1 s−1). It was obvious that MnFe2O4 nanoparticles synthesized in reducing benzyl ether have higher crystallinity and thus higher , SAR, and values, which can serve as a better candidate for hyperthermia and magnetic resonance imaging.
研究领域:
材料科学
·
纳米医学
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Journal of Industrial Textiles
·
2022
·
IF 2.926
Xinghua Hong,Wei Sun,Tao Peng,Junnan Qian,Zhaofa Zhang,Chengyan Zhu,Guangmin Cai
Herein, a MnFe2O4/RGO knitted fabric derived from manganese waste was constructed by a simple in-situ assembled coating method, involving the incorporation of Graphene Oxide (GO) and manganese ferrite nanoparticles on polyester fabric, followed reducing by hydrazine hydrate. The reuse of manganese waste from the preparation of GO can reduce chemical waste emissions and endow the absorption performance. The coated particles possess certain magnetism can be attracted and securely collected in seconds, which is convenient for recycling. This fabric gives well microwave absorption with the maximum reflection loss (RL) of −58.6 dB at 9.1 GHz by a thickness of 1.9 mm. In addition, this fabric presents high stable strain sensing under 1000 stretching and bending cycles. Meanwhile, the resistance-deformation-velocity relationship is provided based on the structure, for the analysis of electromechanical behaviors. Moreover, the fabric has the capability for temperature sensing (TCR=−0.738%/°C), and fire alarm. As such, this fabric can be promising alternatives for a wide application on motion and temperature sensing, microwave blocking.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Zhiying Liu,Yue Teng,Yanhua Xu,YuQi Zheng,Yun Zhang,Mingxin Zhu,Yongjun Sun
In this study, spinel-type MnFe 2 O 4 magnetic nanoparticles were successfully synthesized employing the purified sol–gel method and used for the advanced treatment of biologically pretreated semi-coking wastewater (BPSCW) by the O 3 /H 2 O 2 catalytic system. Results showed that the MnFe 2 O 4 magnetic catalysts did not have a regular surface morphology, and their surface contained numerous fine particles that showed a particle accumulation state and formed a good nano-spinel structure. Their surface morphology, ratio, size, and X-ray photoelectron spectroscopy revealed two active metal elements in the catalyst, namely, Fe 3+ and Mn 2+ , which were consistent with the elemental composition and valence of MnFe 2 O 4 . Under optimal reaction conditions, the removal efficiency of O 3 /H 2 O 2 /MnFe 2 O 4 catalytic system for chemical oxygen demand (COD) and volatile phenol (VP) can reach 85.2% and 94.1%, respectively (catalyst dosage = 2.0 g∙L −1 , O 3 dosage = 1.2 mg∙min −1 , H 2 O 2 concentration = 0.15 mol∙L −1 , pH = 7.0, and treatment time = 70 min). The free radical quenching experiment and electron paramagnetic resonance (EPR) experiment verified that hydroxyl radicals (∙OH) played a role in the deep treatment of BPSCW in the O 3 /H 2 O 2 /MnFe 2 O 4 catalytic system. Phosphate experiments proved that lewis acid sites on the surface of the MnFe 2 O 4 magnetic catalysts were the catalytically active sites. The superparamagnetic properties of the MnFe 2 O 4 magnetic catalysts (67.8 emu∙g −1 ) facilitated magnetic separation from the treated wastewater. After 10 cycles, the activity of the MnFe 2 O 4 magnetic catalysts remained high, and the removal efficiencies of COD and VP only decreased by 13.6% and 11.9%, respectively. Considering excellent degradation performance, easy magnetic separation and high stability, this study provided important insights into the practical application of the O 3 /H 2 O 2 catalytic system for the advanced treatment of BPSCW.
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