ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 31
·24318-24326
·
IF 2.741
Fu Xiaori,Brusseau Mark L.,Zang Xueke,Lu Shuguang,Zhang Xiang,Farooq Usman,Qiu Zhaofu,Sui Qian
This work demonstrates the impact of hydroxylamine hydrochloride (HAH) addition on enhancing the degradation of trichloroethene (TCE) by the citric acid (CA)-chelated Fe(II)-catalyzed percarbonate (SPC) system. The results of a series of batch-reactor experiments show that TCE removal with HAH addition was increased from approximately 57 to 79% for a CA concentration of 0.1 mM and from 89 to 99.6% for a 0.5 mM concentration. Free-radical probe tests elucidated the existence of hydroxyl radical (HO • ) and superoxide anion radical (O 2
•- ) in both CA/Fe(II)/SPC and HAH/CA/Fe(II)/SPC systems. However, higher removal rates of radical probe compounds were observed in the HAH/CA/Fe(II)/SPC system, indicating that HAH addition enhanced the generation of both free radicals. In addition, increased contribution of O 2
•- in the HAH/CA/Fe(II)/SPC system compared to the CA/Fe(II)/SPC system was verified by free-radical scavengers tests. Complete TCE dechlorination was confirmed based on the total mass balance of the released Cl − species. Lower concentrations of formic acid were produced in the later stages of the reaction for the HAH/CA/Fe(II)/SPC system, suggesting that HAH addition favors complete TCE mineralization. Studies of the impact of selected groundwater matrix constituents indicate that TCE removal in the HAH/CA/Fe(II)/SPC system is slightly affected by initial solution pH, with higher removal rates under acidic and near neutral conditions. Although HCO 3
− was observed to have an adverse impact on TCE removal for the HAH/CA/Fe(II)/SPC system, the addition of HAH reduced its inhibitory effect compared to the CA/Fe(II)/SPC system. Finally, TCE removal in actual groundwater was much significant with the addition of HAH to the CA/Fe(II)/SPC system. The study results indicate that HAH amendment has potential to enhance effective remediation of TCE-contaminated groundwater.
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Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Lowell Toku Kokuloku,Elvis Djam Miensah,Aotian Gu,Kaiwei Chen,Peng Wang,Chunhui Gong,Yan Jiao,Kai Chen,Yi Yang
Background Activated carbon (AC) is commonly used to remove many pollutants from water due to its appealing adsorption properties. However, the pristine surface properties of AC limit its ability to effectively remove 2,4,6-trinitrotoluene (TNT, a widely used explosive water contaminant). Modifying AC with Fe nanoparticles (NPs) can significantly improve the surface properties of the Fe/AC composite, thereby enhancing its adsorption capabilities. Method Commercial charcoal-based AC was modified with Fe NPs via wet impregnation followed by a one-step carbothermal synthesis (labeled Fe-AC-800). A detailed characterization of Fe-AC-800 and its counterparts, pristine AC and thermally modified AC (AC-800, without Fe NPs doping) was performed using XRD, Raman Spectroscopy, SEM, EDS, BET, XPS, and FTIR. Then, the adsorption characteristics and performances of Fe-AC-800 were analyzed to determine its effectiveness in removing TNT and compared to AC and AC-800, considering the impact of in-situ Fe-modification and carbothermal treatment. Significant findings Fe-AC-800 displayed a higher adsorption capacity for TNT (387.74 mg/g) than the pristine AC (265.52 mg/g) but only slightly higher than AC-800 (339.64 mg/g). This was ascribed to the combined effect of the carbothermal treatment and Fe NPs doping, which constructed a richer porous structure that improved the Fe-AC-800 surface features and favored TNT removal. The optimal adsorption capacity of Fe-AC-800 was 464.13 mg/g under ambient conditions. TNT adsorption onto Fe-AC-800 and AC-800 conformed to only the Langmuir isotherm model, indicating uniform monolayer adsorption, whereas on the pristine AC, it satisfied both Langmuir and Freundlich isotherm models, respectively. The primary mechanism of TNT adsorption onto Fe-AC-800 was physical adsorption through pore filling, hydrogen bonding, and π-π EDA interactions, respectively.
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Progress in Natural Science-Materials International
·
2024
·
IF 4.8
Ping-an Yang,Rui Cai,Haibo Ruan,Nanqing Zhang,Xin Huang,Rui Li,Yuxin Zhang,Yi Lu,Zhihao Zhou
Controlled fabrication of materials by surface modification techniques has been a hot research topic. In this paper, one-dimensional (1D) core-shell structure Fe@Co nanowires (NWs) were successfully prepared by anchoring 0-dimensional (0D) Co nanoparticles on 1D Fe NWs based on the in situ reduction method. The electromagnetic parameters of the specimens at a filler mass fraction of 25 wt% were tested and the microwave loss mechanism was deeply analyzed. Binary magnetic metals in a core-shell structure have excellent multi-band microwave absorption capability (S-band, X-band and Ku-band). This is due to the heterogeneous interface and magnetic coupling effects tuning the dielectric and magnetic loss. This study offers a workable plan for creating effective multi-band magnetic metal-based microwave absorbers.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ertai Zhang,Shuyan Guan,Haojun Fan,Yongxin Wang,Hui Yan,Lei Guo,Xuedong Zhai,Carlos A. Martínez Huitle,Jing Ding
Sulfite has been proven to promote advanced oxidation processes (AOPs) to achieve low-cost and efficient degradation of contaminants, serving as an alternative to persulfate. In this study, a novel composite Fe/Mn@carbon felt (CF) electrode was successfully constructed to remove carbamazepine (CBZ). The capacity of the Fe/Mn@CF anode to activate sulfite was evaluated under various electrode preparation conditions and operating parameters. Results clearly indicated that the complete removal of CBZ was achieved in Fe/Mn@CF anode activated sulfite system under the specific conditions including Na 2 SO 4 electrolyte concentration of 50 mM, sulfite dosage of 1 mM, initial pH of 7, and current density of 1 mA/cm 2 . The capacity of Fe/Mn@CF anode for sulfite activation was further presented by its excellent reusability and stability in terms of CBZ removal and metal ion release. Both radical and non-radical pathways were significantly contributed to the CBZ removal, including OH, SO 4 · - , O 2 · - , 1 O 2 , and other reasons. Density functional theory (DFT) calculations demonstrated that Fe-Mn bimetals effectively promoted sulfite activation, with the electric field further boosting the process of Fe-Mn valence cycle and oxidation. Overall, the novel Fe/Mn@CF activated sulfite system exhibited outstanding performance and had great potential for sustainable use in removing organics.
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 15
·7449-7455
·
IF 5.968
Shu-Hui Huo,Xiu-Ping Yan
The adsorption of malachite green from aqueous solution on a highly porous metal–organic framework MIL-100(Fe) was studied in view of the adsorption isotherm, thermodynamics, kinetics, and regeneration of the sorbent. The adsorption isotherms of malachite green on MIL-100(Fe) followed the Freundlich model, and MIL-100(Fe) possessed heterogeneous surface caused by the presence of different functional groups on the surface. The adsorption of malachite green on MIL-100(Fe) is controlled by an entropy effect rather than an enthalpy change, and obeyed a pseudo-second-order kinetics. Analysis of the intraparticle diffusion plots revealed that more than one process affected the adsorption, and film (boundary layer) diffusion controlled the adsorption rate at the beginning. Evidence from zeta potential and X-ray photoelectron spectroscopic data showed that the adsorption of malachite green was also driven by electrostatic attraction and the interaction between the Lewis base –N(CH3)2 in malachite green and the water molecule coordinated metal sites of MIL-100(Fe). MIL-100(Fe) gave much higher adsorption capacity for malachite green than other conventional adsorbents such as activated carbon and natural zeolite. The high adsorption capacity, good solvent stability, and excellent reusability make MIL-100(Fe) attractive for the removal of MG from aqueous solution.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Xuning Li,Jiayi Liu,Alexandre I. Rykov,Hongxian Han,Changzi Jin,Xin Liu,Junhu Wang
Two kinds of Fe–Co Prussian blue analogues (Fe–Co PBAs) with different iron valence state, Fe 3 [Co(CN) 6 ] 2 ·12H 2 O and Fe[Co(CN) 6 ]·2H 2 O, were developed as the photo-Fenton catalysts for in-depth investigation of the heterogeneous Fenton reaction mechanism. These two catalysts showed exceptionally high efficiencies for the degradation of Rhodamine B. The efficient redox cycling of iron species in the Fe–Co PBAs photo-Fenton process was deeply explored by Mössbauer spectroscopy. The excellent photo-Fenton activities of these Fe–Co PBAs were ascribed to the existence of highly dispersed water coordinated iron sites and abundant vacancies in the metal-organic-frameworks. Singlet oxygen was identified by radical scavenger experiments and electron paramagnetic resonance spectroscopy, which plays a key role in the photo-Fenton process. Based on these comprehensive experimental results, a novel radical reaction mechanism was proposed. This work not only opens up a new avenue for the application of Fe–Co PBAs, but also gives a deeper insight into the mechanisms of heterogeneous Fenton reactions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Weijun Zhou,Ping Wang,Zhipeng Chen,Xuefei Wang,Huogen Yu
Traditionally, nano-titanium dioxide (TiO 2 ) is widely regarded as an effective hydrophilic material due to its certain amount of hydroxyl groups. However, the limited hydroxyl groups and the poor network structure of the TiO 2 surface result in suboptimal hydrophilicity and stability. In this study, a stable and long-lasting superhydrophilic Fe-coordinated tannic acid (TA) network is constructed by introducing TA and Fe 3+ to form a hydroxyl-rich 3D network on the surface of TiO 2 . The hydrophilicity test results demonstrated that the Fe-TA/TiO 2 film exhibited exceptional superhydrophilic property with a water contact angle of 1.3°, significantly lower than that of the TA/TiO 2 film (18.2°) and the TiO 2 film (65°). Importantly, it maintained long-lasting superhydrophilicity (water contact angle < 10°) for more than 16 days. The superhydrophilicity and long-term stability of the Fe-TA/TiO 2 film can be attributed to the abundance of hydroxyl groups and the stable Fe-coordinated TA 3D networks. This study presents a promising methodology for optimizing the TiO 2 surface through metal-organic coordination for enhanced long-term superhydrophilicity.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Zhiwang Yang,Xueqing Xu,Xixi Liang,Cheng Lei,Yuli Wei,Peiqi He,Bolin Lv,Hengchang Ma,Ziqiang Lei
A series of MIL-53(Fe)-graphene nanocomposite photocatalysts were synthesized by a facile one-pot solvothermal reaction. All materials have been thoroughly characterized by FT-IR, SEM, TEM, PXRD, UV–vis DRS and PL analysis. It was demonstrated that the introducing of graphene on the MIL-53(Fe) would minimize the recombination of photogenerated electron-hole pairs, thus, leading to the enhancement of photocatalytic activity. MIL-53(Fe)-graphene nanocomposite was an efficient catalyst towards the photocatalytic selectively oxidation of alcohols to the corresponding aldehydes or ketones under visible light and ambient conditions. High selectivity of the aldehydes or ketones (99%) were obtained. Meanwhile, the catalyst can be recycled at least four times without loss of catalytic efficiency. A possible photocatalytic reaction mechanism involving a direct photogenerated hole-oxidation process was also investigated in detail by the active species trapping experiments and the related electrochemical analysis.
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CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Bo Xu,Zhiming Chen,Bing Han,Cuncheng Li
This work presents MIL-100(Fe) nanoparticles synthesized using glycol with uniform size and morphology. This is the first report of nanoscale MOFs material synthesized using glycol. The MIL-100(Fe) particles have been characterized by SEM, TEM, XRD and the results indicate that the MOFs particles show monodispersed nanospherical morphology. Photocatalytic study reveals that the MIL-100(Fe) nanospheres exhibit good oxidation ability of benzene to phenol under visible light irradiation with high selectivity.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Junxia Guo,Qijian Niu,Yichun Yuan,Inamullh Maitlo,Jun Nie,Guiping Ma
One-dimensional (1D) nanomaterials have gained attention in energy conversion, storage, and catalyst due to the unique physical and chemical properties. Electrospinning is a kind of simple, versatile, and cost-effective technology to fabricate 1D functional nanofibers. Herein, electrospun polyacrylonitrile (PAN), melamine, and ferric chloride hexahydrate (FeCl 3 ·6H 2 O) composite nanofibers are used as template, and polythiophene (PT) are prepared by photopolymerization technology on the surface of electrospun nanofibers as shell part of fibers. Then, the core–shell nanofibers are pyrolyzed and converted into Fe–S/N–C nanofibers, which can be used as catalysts for ORR due to the metal and S-/N-codoped structure and unique 1D structure which provided facile pathways for efficient mass transport and charge transfer. The ORR electrocatalytic ability of Fe–S/N–C nanofibers is tested and present excellent property, especially in stability and methanol crossover. The electrocatalytic ability of sample is comparable to that of 20 wt% Pt/C benchmarks. These results offer an easy pathway for exploring metal-heteroatom-codoped carbon nanofibers applicable for ORR catalyst.
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Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 32
·7614-7621
·
IF 5.066
Junyao Shen,Yongtao Yao,Yanju Liu,Jinsong Leng
We demonstrate a facile, template-free route for Fe nanowires (NWs) with an average diameter of 100 nm through magnetic-field-assisted hydrothermal conditions. The aspect ratio of the Fe NWs reaches 50. Fe NWs are constructed with interconnected bead-like nanospheres, which are composed of primary nanocrystals (NCs) with an average size of 8 nm. This shows that the polycrystalline Fe NWs have a body-centred cubic (bcc) structure with preferential growth on the 〈110〉 zone axis. Such hierarchical structures involve orientational growth in the presence of an external magnetic field. The molarity of the reducing agent, reaction time and temperature, are further investigated to understand the influence of these parameters on the growth process of Fe NWs. Compared with those of Fe nanoparticles (NPs), the magnetic properties of Fe NWs show both higher saturation magnetization (154.03 emu g−1) and coercivity (360.84 Oe). The peak value of reflection loss (RL) reaches up to −27.28 dB at 3.68 GHz, indicating the excellent microwave absorption performance of the Fe NWs for low gigahertz usage (2–6 GHz). This mild approach to control Fe NWs is easy to scale-up for other iron-related magnetic nanodevice applications.
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CHEMOSPHERE
·
2017
·
IF 4.208
Zilong Zhao,Wenyi Dong,Hongjie Wang,Guanhan Chen,Wei Wang,Zekun Liu,Yaguang Gao,Beili Zhou
Elimination of hypophosphite (HP) was studied as an example of nickel plating effluents treatment by O 3 /H 2 O 2 and sequential Fe(II) catalytic oxidation process. Performance assessment performed with artificial HP solution by varying initial pH and employing various oxidation processes clearly showed that the O 3 /H 2 O 2 ─Fe(II) two-step oxidation process possessed the highest removal efficiency when operating under the same conditions. The effects of O 3 dosing, H 2 O 2 concentration, Fe(II) addition and Fe(II) feeding time on the removal efficiency of HP were further evaluated in terms of apparent kinetic rate constant. Under improved conditions (initial HP concentration of 50 mg L −1 , 75 mg L −1 O 3 , 1 mL L −1 H 2 O 2 , 150 mg L −1 Fe(II) and pH 7.0), standard discharge (<0.5 mg L −1 in China) could be achieved, and the Fe(II) feeding time was found to be the limiting factor for the evolution of apparent kinetic rate constant in the second stage. Characterization studies showed that neutralization process after oxidation treatment favored the improvement of phosphorus removal due to the formation of more metal hydroxides. Moreover, as a comparison with lab-scale Fenton approach, the O 3 /H 2 O 2 ─Fe(II) oxidation process had more competitive advantages with respect to applicable pH range, removal efficiency, sludge production as well as economic costs.
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