RENEWABLE ENERGY
·
2021
·
IF 8.001
Hongyou Wan,Fuzhen Wang,Yuhan Chen,Zisheng Zhao,Guangyi Zhang,Ming Dou,Binghan Xue
In this study, nano-Fe 3 O 4 supporting on granular activated carbon (NFGAC) were prepared, characterized and used as an individual additive to promote the anaerobic digestion of azo dye Reactive Red 2 (RR2) wastewater. Results showed that organics removal and methane production were effectively promoted with the addition of NFGAC. Compared with the control reactor, the RR2 removal efficiency increased by 117.9% and the methane production increased by 167.2% in the 0.18-NFGAC added reactor when sole RR2 used as the substrates. Further analysis indicated that during the RR2 anaerobic digestion process the electron transfer system (ETS) activity was effectively improved with the addition of NFGAC. One of the possible mechanism was that the loading nano-Fe 3 O 4 on the surface of GAC could increase the number of functional groups in NFGAC, which were beneficial to enhancing the electron accepting capacities (EAC) and electron donating capacities (EDC). Microbial community analysis showed that the bacteria ( Halomonas , Pseudomonas and Bacillus ) relevant to RR2 removal were enriched in NFGAC added reactors, which played an important role during RR2 removal process. In addition, the addition of NFGAC could promote potential direct interspecies electron transfer (DIET) between Pseudomonas and Methanosarcina.
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高影响因子
Catalysts
·
2025
·Vol. 15
·期 12
·1120
·
IF 4
Peng Yang,Hualei Hu,Yong Yang,Guojun Lan,Soliman I. El-Hout,Qianquan Fang,Guowen Lu,Chunlin Chen,Jian Zhang
The nano-metal oxide-catalyzed oxidation of 5-hydroxymethylfurfural (HMF) with sodium hypochlorite (NaClO) is an effective and mild technique for synthesizing 2,5-furanediformic acid (FDCA). However, the rapid and large-scale separation of nanocatalysts remains a major challenge. In this study, we developed a magnetic and recyclable copper oxide-based catalyst supported on the mechanochemically synthesized Fe3O4. Benefiting from the introduction of the Fe3O4carrier and cetyltrimethylammonium bromide (CTAB) surfactant, the CuO-CTAB/Fe3O4catalyst owns smaller CuO particle sizes, which endows it with excellent catalytic activity in the oxidation of HMF, achieving a high FDCA yield of 90.3%. Furthermore, the rapid magnetic separation of the catalyst effectively inhibits the excessive conversion of FDCA. The recovered catalyst can be reused for at least five cycles without significant loss of catalytic performance, confirming the promising application prospect of the CuO-CTAB/Fe3O4catalyst.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Pingping Zhang,Hengyang Mao,Shouyong Zhou,Mingmin Jia,Lei Zhou,Juan Zhai,Ailian Xue,Meisheng Li,Jing Zhong,Qi Zhang,Yijiang Zhao
The intercalation of inorganic nanofillers into graphene oxide (GO) layers regulates the pore structure of composite membranes , enhancing their application in oil-in-water (O/W) separation. However, the weak bonding between the nanofillers and GO may compromise membrane stability, affecting separation performance. Herein, we present a method for constructing a highly stable one-dimensional (1D) nanorod-intercalated GO composite membrane. The surface carboxyl density of GO was enhanced through modification, and Fe 3 O 4 nanoparticles were grown on the surface of 1D attapulgite (FATP) to adjust the hydroxyl density and roughness. The results indicate that strong interactions are formed between FATP and carboxylated graphene oxide (CGO), enhancing the binding force to −1.38 × 10 4 kcal·mol −1 . Benefiting from the intercalation effect and hydrophilic characteristics of FATP, the composite membrane exhibits a relatively high pure water flux (1630.5 L·m −2 ·h −1 ), hydrophilicity (water contact angle of 63°), and underwater superoleophobicity (underwater oil contact angle of 159°). In the O/W separation process, the composite membrane can effectively repel oil droplets with stable flux and oil rejection of 175.6 L·m −2 ·h −1 and > 98 %, respectively. Furthermore, the membrane exhibits excellent stability with steady permeability remaining approximately 80.2 % of the original value after multiple cycles of operation in diverse acidic and alkaline environments.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Xiangfeng Chen,Ning Ding,Hao Zang,Hoisze Yeung,Ru-Song Zhao,Chuange Cheng,Jianhua Liu,T.-W. Dominic Chan
Fe 3 O 4 @MIL-100 core–shell magnetic microspheres were, for the first time, used as the sorbent for the magnetic solid-phase extraction (MSPE) of polychlorinated biphenyls at trace levels in environmental water samples. GC coupled with tandem MS was used for sample quantification and detection. The Box–Behnken design was used to determine the optimum extraction parameters influencing extraction efficiency through response surface methodology. Under the optimized conditions, the developed method showed good linearity within the range of 5–4000 ng L −1 , low limits of detection (1.07–1.57 ng L −1 ; signal-to-noise ratio = 3:1), and good extraction repeatability (relative standard deviation < 12%; n = 5). Environmental samples collected from the Yellow River, local lake, wastewater, and snow water were processed using the developed method. The results demonstrated that the Fe 3 O 4 @MOF core–shell magnetic microspheres are promising sorbents in the MSPE of aromatic pollutants from environmental water samples.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Pei Dong,Xi Chen,Meiting Guo,Zhiyuan Wu,Haolong Wang,Feifei Lin,Jinqiang Zhang,Shuaijun Wang,Chaocheng Zhao,Hongqi Sun
Self-supporting electrodes have triggered great interests in improving electro-Fenton (EF) system for degradation of refractory organic pollutants . In this work, a novel self-supporting carbon fiber paper (CFP) electrode modified by transition metals, e.g. Fe and Mn, was fabricated and employed as a heterogeneous EF cathode. The prepared electrode exhibited excellent degradation for a number of typical organic pollutants along with superior stability. Remarkably, a high removal efficiency was achieved in the EF treatment of shale gas fracturing flowback wastewater. Results indicated that 65.2% TOC and 74.8% COD were eliminated after 4 h degradation. The residual COD value of the real wastewater was 80 mg L −1 , meeting the emission requirement of the integrated wastewater discharge standard (COD ＜ 100 mg L −1 ) with a low specific energy consumption of 6.9 kWh kg −1 COD −1 . This work demonstrates a competing alternative for efficient decontamination of real wastewater using an electro-Fenton strategy with a low-cost electrode.
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PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74575-74584
·
IF 3.84
Zhenzhen Wang,Shangru Zhai,Jialing Lv,Haixin Qi,Wei Zheng,Bin Zhai,Qingda An
A novel monodispersed hierarchical nanocomposite catalyst of Cu/Fe3O4 was successfully synthesized through a short-time (just 4 h), facile, eco-friendly one-pot hydrothermal method. The as-prepared Cu/Fe3O4 nanocomposite was well characterized and the results showed that the products were spherical in morphology with diameters of about 100 nm. The BET surface area of the nanospheres was 37.16 m2 g−1, indicating that the product showed a porous character, and the major BJH pore size was 3.73 nm. The saturated magnetization of the Cu/Fe3O4 nanospheres was 48.0 emu g−1, which facilitated their separation and recovery with the aid of an external magnet. In addition, the influences of experimental parameters such as the dosage of trisodium citrate dehydrate (Na3Cit) and urea as well as reaction duration time were investigated in detail to fully elucidate the formation mechanism. More charmingly, the Cu/Fe3O4 nanocomposites exhibited excellent catalytic activity towards the reduction of hazardous organic dyes (4-nitrophenol, 4-NP; congo red, CR; methylene blue, MB) in aqueous media in the presence of NaBH4 with very fast kinetics and good stability. The relationship between the Cu precursor addition amount and catalytic ability was also established. Considering the simplicity of the operation procedure, short time, low cost as well as easy recycling of the catalyst, this preparation protocol may shed light on the fabrication of other metal oxide materials; and hopefully, this hierarchical nanocomposite may find potential applications in other domains like heavy metal removal or antibacterial applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jie-Ping Fan,Bing Zheng,Yu Qin,Dan Yang,Dan-Dan Liao,Xiao-Kang Xu,Xue-Hong Zhang,Jian-Hang Zhu
In this work, a superparamagnetic Fe 3 O 4 -graphene oxide (MGO) nanocomposite was prepared by one-step chemical co-precipitation method, and characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), powder X-ray diffraction (PXRD), Raman spectroscopy and nitrogen adsorption–desorption curve. The as-prepared MGO was used to adsorb nuciferine, and the adsorption kinetic, isotherm and reusability of MGO were also investigated. The results showed that the adsorption of nuciferine on MGO reached its equilibrium very quickly (within 10 min) due to the two-dimensional carbon nanostructure of GO. In comparison with MGO, five conventional sorbents, i.e., macroporous resin D-101, silica gel, reverse phase silica gel (RP-C18) and cation exchange resin and polyamide, were also used to evaluate their adsorption capabilities. Therefore, MGO combined the advantages of both superparamagnetic particle and GO, i.e., easy separation and high absorption capacity. Finally, MGO was successfully applied to enrichment and separation of nuciferine in the extract of Nelumbinis Folium (Lotus leaf).
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 89
·86531-86539
·
IF 3.289
Xinjuan Li,Suli Zhang,Beilei Yang,Chunna Lv,Xianbin Jia,Zhiguo Hu
Magnetic nanoparticles grafted with chiral polymer brushes offer an effective way to bridge the gap between heterogeneous and homogeneous catalysis. Herein, we synthesized a series of chiral catalysts immobilized on magnetic Fe3O4 nanoparticles (MNPs) with a controlled shell structure by an efficient method. This involves the synthesis of “living” Fe3O4 nanoparticles with surface-bound vinyl groups and their subsequent grafting with chiral polymer brushes by the simple RAFT coupling reaction (i.e., chiral polymers with a dithioester end group couple with vinyl groups on the MNPs in the presence of a free radical initiator). The well-defined characteristics of the resulting MNPs allowed the first systematic study of the effects of various structural parameters (the chiral polymer molecular weight and grafting density) on their catalytic performance, which is of great importance for rationally designing more advanced chiral catalyst loading. In particular, the resulting Fe3O4-supported catalysts can effectively catalyze the asymmetric Diels–Alder reaction and can be recycled five times by simple magnetic separation while maintaining activity and selectivity.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 8
·3487-3492
·
IF 3.288
Guopeng Chen,Guofeng Zhang,Fuchao Yang
Stimuli-responsive materials with appealing interactions can serve as key modules for smart devices and have a broad scope of application. In this study, Fe3O4@PDA@TiO2 microspheres with a core–shell structure were assembled. The hollow microspheres have a mesoporous structure and were characterized by SEM, TEM, XRD, Raman, BET, XPS, UV-vis and TGA analyses. Then, a photoresponsive coating with reversibly switchable wettability was prepared by a simple sieve-deposition method using Fe3O4@PDA@TiO2 powder. In addition, the Fe3O4@PDA@TiO2 coated fiber textile was obtained by a dipping method and was used for oil–water separation due to its underwater superoleophobicity. Finally, it was found that this material with its hollow and mesoporous structure can be used for dye adsorption, while the anatase TiO2 ingredient shows good photocatalysis performance.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shuangqin Tian,Xin Shi,Shujie Wang,Yi He,Bifang Zheng,Xianhong Deng,Ziqin Zhou,Wenbin Wu,Kai Xin,Lihong Tang
With the ever-increasing challenge of heavy metal pollution, the imperative for developing highly efficient adsorbents has become apparent to remove metal ions from wastewater completely. In this study, we introduce a novel magnetic core–shell adsorbent, Fe 3 O 4 @UiO-66-PDA. It features a polydopamine (PDA) modified zirconium-based metal–organic framework (UiO-66) synthesized through a simple solvothermal method. The adsorbent boasts a unique core–shell architecture with a high specific surface area, abundant micropores, and remarkable thermal stability. The adsorption capabilities of six metal ions (Fe 3+ , Mn 2+ , Pb 2+ , Cu 2+ , Hg 2+ , and Cd 2+ ) were systematically investigated, guided by the theory of hard and soft acids and bases. Among these, three representative metal ions (Fe 3+ , Pb 2+ , and Hg 2+ ) were scrutinized in detail. The activated Fe 3 O 4 @UiO-66-PDA exhibited exceptional adsorption capacities for these metal ions, achieving impressive values of 97.99 mg/g, 121.42 mg/g, and 130.72 mg/g, respectively, at pH 5.0. Moreover, the adsorbent demonstrated efficient recovery from aqueous solution using an external magnet, maintaining robust adsorption efficiency (>80%) and stability even after six cycles. To delve deeper into the optimized adsorption of Hg 2+ , density functional theory (DFT) analysis was employed, revealing an adsorption energy of -2.61 eV for Hg 2+ . This notable adsorption capacity was primarily attributed to electron interactions and coordination effects. This study offers valuable insights into metal ion adsorption facilitated, by magnetic metal–organic framework (MOF) materials.
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高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Tian Hu,Bu-Ning Liu,Huaitian Bu,Han-Jian Hu,Qi-Shun Zhu,Shipeng Tang,Yongtao Li,Jinjin Wang,Gang-Biao Jiang
Cadmium (Cd) removal from soil is crucial as Cd enters the food chain and affect food safety, thus impose severe threaten to human health. We developed PPC@PC-Fe, a dual-functional core-shell sphere for efficient soil Cd reduction. The shell (PPC) was composed of encapsulated citric acid (CA) in a polylactic acid (PLA) and polyethylene glycol (PEG) network, which endows a function of activating Cd; and the core (PC-Fe) consisted of a polyacrylic acid/carboxymethyl chitosan (PAA/CMC) hydrogel with Fe 3 O 4 nanoparticles to adsorb adjacent activated Cd. Upon water contact, the shell dissolved, releasing CA to activate soil Cd. Simultaneously, the swellable PC-Fe core absorbed water and expanded in size, promoting the disintegration of PLA in the shell, which triggered the automatic separation of core from shell, enabling the exposed PC-Fe core to rapidly adsorb Cd. Furthermore, the PC-Fe core can be magnetically removed after adsorption of Cd. Soil culture tests showed that 2 % PPC@PC-Fe reduced soil Cd from 6.009 mg/kg to 4.834 mg/kg in 10 days, with the acid-soluble Cd being the predominantly target to be activated and remove. This study demonstrates an effective stepwise activation and adsorption mechanism by a single carrier, with simple magnetic collection minimizing secondary pollution. It offers an innovative approach to the remediation of cadmium-contaminated sites in the field.
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高影响因子
Small
·
2024
·
IF 13
Chunxiao Li,Yuying Feng,Jiahui Jiang,Ting Zhao,Guancheng Xu,Li Zhang
Transition metal-based tellurides (TMTs) with excellent electrical conductivity are expected to be ideal electrocatalysts for overall water splitting. However, compared to transition metal sulfides and selenides, the reported applications of TMTs in overall water splitting are fewer. Herein, the NiTe/FeTe/Fe 3 O 4 /FF carnation flower-like with a semi-coherent interface is successfully constructed to enhance the electrochemical overall water splitting performance. Specifically, it achieves low overpotentials of 54 and 176 mV at 10 mA cm −2 for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), respectively. What's more, the electrolyzer requires a cell voltage of 1.5 V to sustain a current density of 10 mA cm −2 and maintains remarkable stability for an extensive duration of 450 h even at a current density of 100 mA cm −2 . Semi-coherent interface engineering and vacancy engineering not only improve the OH⁻ adsorption capacity of catalysts but also promote the desorption of adsorbed hydrogen (H ads ). In situ Raman spectroscopy reveals that FeOOH and NiOOH formed by NiTe/FeTe/Fe 3 O 4 /FF during the OER are the genuine active sites. This study provides a promising approach for the electrochemical water splitting of TMTs by combining semi-coherent interface engineering and vacancy engineering.
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高影响因子
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