Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Taiqing Wei,Yang Meng,Dan Ai,Chi Zhu,Bo Wang
This study used biochar as the substrate of the electrodes, and a simple synthetic process (ball milling) was adopted to prepare the Fe 3 O 4 @biochar cathode enhanced coupled system of electrochemistry-potassium persulfate to achieve the efficient removal of sulfadiazine. Studies showed that the cracking temperature of biochar and the iron-to-carbon mass ratio determined the catalytic performance of cathodes. In addition, ball milling increased the surface functional groups of biochar and promoted the dispersion of Fe 3 O 4 on biochar, leading to increased active sites on the Fe 3 O 4 @biochar cathode surface. It was found that SDZ and TOC removal rates reached 95.3% and 86.9% in the coupled system of electrochemical-persulfate with SDZ concentration of 10 mg/L, initial pH 0 of 7, PDS concentration of 4 mM, current density of 30 mA/cm 2 , and electrode plate spacing of 4 cm. Also, this system showed excellent removal of sulfadiazine in actual water bodies. The quenching experiments and electron paramagnetic resonance spectra revealed that free radicals and non-radicals were involved in removing sulfadiazine, with free radicals (SO 4 •− ) being the dominant pathway. Four main degradation pathways were proposed based on the intermediates of sulfadiazine. In conclusion, Fe 3 O 4 @biochar cathode enhanced coupled system of electrochemical-persulfate could be regarded as an efficient cleaning technology to provide a method for the removal of intractable organic pollutants .
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Jingjing Wang,Jinyang Feng,Chuanfu Wei
In the present study, molecularly imprinted polyaniline was immobilized on Fe 3 O 4 /ZnO composite by surface imprinting technique. The obtained molecularly imprinted photocatalyst was used for selective degradation of amoxycillin under visible light irradiation. The presence of Fe 3 O 4 not only endowed the photocatalyst with magnetic separation feature but also enhanced visible light harvesting ability. Compared with Fe 3 O 4 /ZnO composite, photocatalytic performance of the molecularly imprinted photocatalyst was significantly improved because polyaniline could form a heterojunction with ZnO to enhance photocatalytic performance. The molecularly imprinted photocatalyst displayed better photocatalytic efficiency and selective photodegradation activity towards amoxycillin than the non-imprinted photocatalyst, because the photodegradation reaction could take place not only on surface of the photocatalyst but also in imprinted cavities for the molecularly imprinted photocatalyst, while the photodegradation only occurred on surface of the non-imprinted photocatalyst. Active species capture experiments showed that .O 2 - and h + played a crucial role in the degradation of amoxycillin. The current research provided new insight for fabrication of molecularly imprinted photocatalyst with selective degradation ability for organic pollutants.
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BIORESOURCE TECHNOLOGY
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2022
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IF 11.889
Lanting Wang,Zhongfang Lei,Xiaojing Yang,Chi Zhang,Chang Liu,Kazuya Shimizu,Zhenya Zhang,Tian Yuan
High treatment capacity for food waste (FW) is required due to the huge amount generated worldwide. Conversion of FW to volatile fatty acids (VFAs) via anaerobic fermentation is a promising technology; however, inhibition of VFAs production could easily occur at high loadings. In this study, Fe 3 O 4 was used to enhance VFAs production in anaerobic fermentation of FW at high loading, and the mechanisms involved were revealed at microbial levels. Results showed that Fe 3 O 4 significantly enhanced VFAs yield and VFAs productivity of microbes by 160% at high loading (substrate to inoculum (S/I) ratio of 3). The enhancement effect of Fe 3 O 4 was mainly due to the accelerated hydrolysis of particulate/soluble organics, the enriched hydrolytic and acidogenic bacteria, and the reduced relative abundance of Lactobacillus . This study provides a new approach for the high-efficient treatment of FW at high loadings, while the performance and economic benefit should be further studied for practical application.
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Arabian Journal of Chemistry
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2022
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IF 6.212
Jiacheng Li,Lisha Liao,Yannan Jia,Tian Tian,Shiwei Gao,Chenyue Zhang,Wei Shen,Zheng Wang
In this study, the preparation of magnetic Fe 3 O 4 /ZIF-8 (MFZ) and its adsorption properties for Cd(II) from water were investigated. Various characterizations demonstrate that the as-prepared MFZ has well magnetic-separation performance and thermal stability. In batch adsorption tests, the effects of pH, initial concentration, and adsorbent dosage were evaluated. According to the findings, when the pH is 7 and the dosage is 150 mg/L, the adsorption capacity for a 40 mg/L Cd(II) solution reaches 102.3 mg/g in 180 min. The Cd(II) adsorption processes was found to correspond to pseudo-first-order kinetics and Langmuir model according to the adsorption kinetics and isotherms. The Langmuir model predicted a maximal saturation adsorption capacity of 160.26 mg/g at 298 K. Thermodynamic analysis revealed that the Cd(II) adsorption is an endothermic, spontaneous process. Ion exchange, coordination reaction, and electrostatic interaction are all involved in Cd(II) adsorption by MFZ. The optimum conditions for Cd(II) adsorption were proposed and confirmed in accordance with the results of the response surface optimization experiments. Furthermore, regeneration tests demonstrate the great repeated regeneration ability of MFZ. According to the anticipated production cost, treating wastewater with a Cd(II) concentration of 40 mg/L would cost roughly US$ 8.35/m 3 . MFZ showed good potential for Cd(II) removal from water.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Ming Xiao,Ruixue Li,Jinglin Yin,Junhui Yang,Xinyu Hu,Hongbo Xiao,Wenlei Wang,Ting Yang
The treatment of arsenite pollution in water has always been concerned. Oxidation of high toxic As(III) to relatively low toxic As(V) by efficient photocatalytic oxidation technology is a research hotspot. This paper is focused on the active photocatalyst of TiO 2 @Fe 3 O 4 composites synthesized by a simple hydrothermal method for the efficient photocatalytic oxidation of As(Ⅲ). The successful construction of Ti–O–Fe interface bonds between TiO 2 and Fe 3 O 4 significantly promoted the transfer efficiency of photo-generated carriers, and further rapidly improved the photocatalytic oxidation efficiency of As(Ⅲ). The application results showed that the constructed TiO 2 @Fe 3 O 4 photocatalyst with 0.10 g Fe 3 O 4 (TF-0.10) could complete the transformation from As(Ⅲ) (10,000 μg/L) to As(Ⅴ) within 4 min with a high oxidation ratio of 100% and maintained the good properties with unchanged crystal structure after five cycles. Furthermore, the photocatalytic properties of TiO 2 @Fe 3 O 4 composites were still stable under different pH values. Electron paramagnetic resonance (EPR) consequence displayed that the superoxide radical (‧O 2 — ) and hole (h + ) were the main intermediate product in the arsenic photocatalytic oxidation system, and hydroxyl radical (‧OH) had little effect on this oxidation system. The possible mechanism of As(Ⅲ) photocatalytic conversion was further explored based on the results of the data analysis. Furthermore, this work provides a potential new idea for the practicability of efficient photocatalytic arsenic oxidation.
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Materials Chemistry Frontiers
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2022
·Vol. 6
·期 17
·2524-2534
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IF 8.683
Xinyan Lv,Zhonglin Wei,Canyu Cui,Wenwen Wang,Yumei Tan,Shihui Jiao,Guangsheng Pang
Developing superhydrophobic material with good chemical stability, non-toxic and low-cost for effectively handling oil spill incidents, chemical leakages and industrial oily wastewater has become an urgent need. In this work, superhydrophobic Fe3O4@C microspheres have been successfully anchored on polyurethane (PU) sponge skeleton surface with polyvinylidene fluoride (PVDF) as intermediate layer. The superhydrophobic Fe3O4@C/PVDF/PU sponge possesses outstanding superhydrophobic performance with water contact angle (WCA) of 156.5° and sliding angle (SA) of 6°. Meanwhile, the Fe3O4@C/PVDF/PU sponge shows excellent chemical, thermal and mechanical stabilities under harsh conditions, high separation efficiencies for surfactant-stabilized organic solvent/water emulsions (more than 99.6% for both O/W and W/O emulsions) and preferable recyclability (more than 15 cycles). The comprehensive performances of the Fe3O4@C/PVDF/PU sponge make it a promising candidate for the treatment of industrial oily wastewater.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
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IF 8.91
Yunjiang Yu,Haobo Guo,Zijuan Zhong,Anqi Wang,Mingdeng Xiang,Senhao Xu,Chenyin Dong,Zhaofeng Chang
In this study, pristine biochar (BC), ball milling biochar (MBC), Fe 3 O 4 modified BC (Fe 3 O 4 @BC), and Fe 3 O 4 modified MBC (Fe 3 O 4 @MBC) were prepared to compare the Bisphenol A (BPA) removal efficiency by activating persulfate (PDS). All catalysts exhibited excellent degradation rather than adsorption in the PDS system, and Fe 3 O 4 @MBC800 had the best BPA removal efficiency, with 96.73% degradation and negligible 1.43% adsorption due to the synergistic effect between MBC800 and Fe 3 O 4 particles. Radical quenching experiments and electron paramagnetic resonance analysis indicated radical pathways, namely, SO 4 ∙ - and ∙OH, O 2 ∙ - , and non-radical pathway ( 1 O 2 ) involving BPA degradation. The abundant oxygen-containing groups, increased graphitization and mesopores of MBC800, and Fe 3+ /Fe 2+ conversion of Fe 3 O 4 particles facilitated PDS activation to produce reactive oxygen species . In addition, the superior electrochemical performance accelerated the electron transfer between the catalyst and PDS, promoting BPA degradation in the Fe 3 O 4 @MBC800/PDS system. More importantly, Fe 3 O 4 @MBC800 is resistant to environmental interference, including pH, anions, cations, and humic acid , and has good catalytic reusability and stability, which fulfills the requirements of engineering applications . Therefore, Fe 3 O 4 loaded on ball-milled biochar provides a convenient strategy for preparing environmentally friendly, economical, and efficient carbon-based catalysts to remove organic contaminants .
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Yuying Chen,Qing Yang,Wenqin Lu,Yanjuan Zhang,Zuqiang Huang,Huayu Hu,Tao Gan
Although the core–shell structure magnetic nanocomposites have been widely used as lubricant additives, their tribological properties are still poor under high temperature and high load. Herein, the graphitized C/Fe3O4 magnetic nanocomposites (g-C/Fe3O4) with an interpenetrating network structure were successfully fabricated by an in situ hydrothermal carbonization method combined with a subsequent ball milling process at room temperature. The results showed that the ball milling process not only promoted the transformation of graphitized carbon but also effectively eliminated the interfacial effect between carbon and Fe3O4. Moreover, the g-C/Fe3O4 used as a lubricant additive in rapeseed oil exhibited excellent tribological properties and high thermo-stability under 155 °C and 980 N, with the friction coefficient reduced by 32.8% compared to the independent Fe3O4. The enhanced tribological performance of g-C/Fe3O4 could be attributed to the graphitized carbon and its interpenetrating network structure under low load force (392 N), while under high load force (980 N), it could be ascribed to the synergistic effect between the graphitized carbon and magnetic Fe3O4 nanoparticles. This work not only offers a method for the synthesis of nanocomposite lubricant additives but also shows great potential in practical applications for high-temperature tribology.
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ANALYTICAL CHEMISTRY
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2022
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IF 8.008
Liuying He,Xiao Wang,Junyu Chen,Yuze Li,Liping Wang,Caiqiao Xiong,Zongxiu Nie
Liver cancer (LC) is the third frequent cause of death worldwide, so early diagnosis of liver cancer patients is crucial for disease management. Herein, we applied NH2-coated polystyrene@Fe3O4 magnetic beads (PS@Fe3O4–NH2 MBs) as a matrix material in laser desorption/ionization mass spectrometry (LDI-MS). Rapid, sensitive, and selective metabolic profiling of the native biofluids was achieved without any inconvenient enrichment or purification. Then, based on the selected m/z features, LC patients were discriminated from healthy controls (HCs) by machine learning, with the high area under the curve (AUC) values for urine and serum assessments (0.962 and 0.935). Moreover, initial-diagnosed and subsequent-visited LC patients were also differentiated, which indicates potential applications of this method in early diagnosis. Furthermore, among these identified compounds by FT-ICR MS, the expression level of some metabolites changed from HCs to LCs, including 29 and 12 characteristic metabolites in human urine and serum samples, respectively. These results suggest that PS@Fe3O4–NH2 MBs-assisted LDI-MS coupled with machine learning is feasible for LC clinical diagnosis.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
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IF 9.463
Ting Liu,Na Zhang,Kaili Zhang,Yan Wang,Yiming Qi,Meng Zong
Two-dimensional layered metal carbides (MXene) have a broad application prospect in electromagnetic absorption, but suffer from poor impedance matching, which limits the absorbing performance. Herein, an efficient nanocomposite absorber was successfully prepared via loading Co-substituted β 2 -keggin-type polyoxometalate doped with polypyrrole and Fe 3 O 4 on the surface of MXene . Polyoxometalate and HCl as a proton acid doped polypyrrole, with anions attached to the main chain, could adjust the electromagnetic parameters, making the nanocomposites material easily achieve the best conductivity and impedance matching; Fe 3 O 4 introduced magnetic loss, and the freedom of movement of Fe 2+ and Fe 3+ caused multiple polarization; dipole polarization was induced by defects, dipoles and dangling bonds in nanocomposites; the charge accumulated at the three phase interface and led to interfacial polarization. We had conducted research on the absorbing properties of nanocomposites with different as-prepared unitary to ternary products, loading rates and component proportion. When the filling level was 45 wt%, an optimal reflection loss value of MXene/PPy@β 2 -SiW 11 Co/Fe 3 O 4 nanocomposites at only 1.7 mm reached up to −62.6 dB, and the effective absorption bandwidth of 9 GHz could be obtained at the low thickness range of 1.5–2.9 mm. These results demonstrated that the prepared nanocomposites were expected to be a promising electromagnetic wave absorber with thin thickness and high absorption intensity.
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Materials Today Communications
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2022
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IF 3.662
Asim Mushtaq,Zhe Tang,Yike Hou,Zheng Zhu,Cong Tian,Yuling Wu,Yuguang Lu,M. Zubair Iqbal,Xiangdong Kong
Theranostic nanomedicine designs integrating diagnostic and therapeutic paradigms have been achieving considerable success at clinics. However, the toxicity of nanocomposites in these designs remains a major obstacle to the success of personalized medicine. Herein, highly biocompatible iron and hydroxyapatite materials were selected to design a Fe 3 O 4 -HAp nano-theranostic system with controlled dimensions using simple solvothermal synthesis . The biocompatibility of Fe 3 O 4 -HAp magnetic hydroxyapatite nanocomposites (MHNCs) was further enhanced by Food and Drug Administration- (FDA-) approved triblock copolymers , namely, Pluronic® F-127. Indeed, polymer modification improved the drug encapsulation capacity of HAp, and 70% anti-TROP 2 was loaded onto the surface of MHNCs for intracellular targeting of breast cancer. The Fe 3 O 4 component of MHNCs possessed a high T 1 -MR imaging enhancement feature with an excellent r 1 value, demonstrating these MHNCs as capable substitutes for Gd-based toxic contrast agents. Moreover, indocyanine green (ICG-) coupled-MHNCs revealed strong absorption in the near-infrared region and produced enough temperature (75 °C), even at low (50 ug/mL) concentrations, to ablate cancerous cells upon 808 laser irradiation to induce cell toxicity and apoptosis. The promising diagnostic and photothermal therapeutic performance of these designed MHNCs make them an ideal nano-theranostic agent.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Rui Huang,Yi Zhou,Jiaxiang Hu
Latent fingerprints (LFPs) are important trace evidences found at crime scenes that assist forensic experts in human identification, and a growing number of studies show that LFPs have some medical value. Herein, as one of the common nanoenzymes, Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) was used for LFPs imaging due to its excellent superparamagnetic properties and for recognition of glucose/H 2 O 2 on LFPs because of its horseradish peroxidase-like activity, which makes it possible to diagnose diabetes non-invasively through LFPs. Furthermore, the intelligent qualitative and semi-quantitative analysis of glucose/H 2 O 2 on LFPs was achieved by designing the classifier based on the multi-channel convolutional neural network (MC-CNN) technology. The qualitative accuracy rate is over 97% and the semi-quantitative accuracy rate reaches 90%. This work offers the promise to facilitate cross-disciplinary studies between artificial intelligence methods and fingerprint development technique.
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