ACS Applied Materials & Interfaces
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2019
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IF 8.456
Liangbo Xie,Xueyue Mi,Yigang Liu,Yi Li,Yan Sun,Sihui Zhan,Wenping Hu
Polyacrylamide (PAM) in environmental water has become a major problem in water pollution management due to its high molecular mass, corrosion resistance, high viscosity, and nonabsorption by soil. The composite of Fe-doped Ce0.75Zr0.25O2 solid solution (Fe-Ce0.75Zr0.25O2) loaded on carbon felt (CF) was fabricated by a hydrothermal synthesis method, which was used as the cathode in a heterogeneous electro-Fenton system for the degradation of PAM. It showed that the degradation efficiency of PAM by the Fe-Ce0.75Zr0.25O2/CF cathode was 86% after 120 min and the molecular mass of PAM decreased by more than 90% after 300 min. Total organic carbon removal reached 78.86% in the presence of Fe-Ce0.75Zr0.25O2/CF, while the value was only 38.01% in the absence of Fe-Ce0.75Zr0.25O2. Further studies showed that the breaking of the chain begins with the amide bond, and then, the carbon chain was cracked into a short alkyl chain. As degradation progressed, both the complex viscosity and elasticity modulus of PAM solutions decreased nearly 50% at 300 min. It indicated that •OH were the most significant active species for the degradation of PAM. This novel Fe-Ce0.75Zr0.25O2/CF composite is an efficient and promising electrode for the removal of PAM in wastewater.
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RSC Advances
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2019
·Vol. 9
·期 41
·23711-23717
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IF 3.049
Shu-Hui Huo,Chen-Xu Liu,Peng-Xin Zhou,Jing Yu,Lei Bai,Zhen-Gang Han,Xiao-Quan Lu
Development of novel porous materials for efficient adsorption and removal of environmental pollutants from aqueous solution is of great importance and interest in environmental science and chemistry. Herein, we reported a facile synthesis of recyclable magnetic carbonaceous porous composite derived from iron-based metal–organic framework MIL-100(Fe) for superior adsorption and removal of malachite green (MG) from aqueous solution. Because of large surface area and high porosity, the synthesized magnetic carbonaceous porous material presented a superior adsorption capacity of 2090 mg g−1 for MG. The adsorption of MG on magnetic carbonaceous porous composite is endothermic and spontaneous. The prepared magnetic carbonaceous porous composite could be separated easily and rapidly from the solution matrix by an external magnet. The rapid adsorption, large adsorption capacity and good reusability make it attractive for practical use in the adsorption and removal of dyes from aqueous solutions.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Atian Xie,Jiuyun Cui,Jin Yang,Yangyang Chen,Jihui Lang,Chunxiang Li,Yongsheng Yan,Jiangdong Dai
Herein, a graphene oxide/MIL-88A(Fe) (GO/M88A) membrane was prepared for the first time by a facile vacuum filtration method. The intercalation of photo-Fenton catalytic M88A into GO nanosheets can not only regulate 2D nanochannels, but also endow the membrane with photo-Fenton catalytic activity. Accordingly, the GO/M88A membrane showed an enhanced separation efficiency and flux (more than 6 times that of GO membrane) based on synergistic separation/photo-Fenton processes. Importantly, the GO/M88A membrane maintained high separation efficiency (97.87 %) and almost constant flux even after 12 cycles of MB separation. The GO/M88A membrane can also be used to treat real textile wastewaters. Moreover, the membrane was directly used as catalyst for photo-Fenton catalytic degradation of contaminants with high degradation efficiency for MB (98.81 %) and BPA (97.27 %). Therefore, the results indicate that this novel GO/M88A membrane has excellent separation performance, stability and photo-Fenton activity and can be used as a potential membrane for water purification and environmental protection applications.
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JOURNAL OF CATALYSIS
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2019
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IF 7.723
Bo Ye,Ronghua Jiang,Zebin Yu,Yanping Hou,Jun Huang,Boge Zhang,Yiyi Huang,Yalan Zhang,Runzhi Zhang
The preparation of Pt quantum dots (Pt QDs) is an effective way that can solve the high cost problem by reducing the high dosage requirement of noble metal Pt. On the other hand, organic metal framework (MOF) can be used for the stabilization of metal nanoparticles with small size and uniform dispersion. Herein, we successfully synthesized a bifunctional electrocatalyst via a facile one-step hydrothermal treatment. Pt QDs cores are uniformly coated with Fe-MOF nanosheet arrays shell (Pt QDs @Fe-MOF) with a porous cuboids structure on Ni foam (NF). With the quantum size and core-shell structure, the self-assembled porous cuboids of Pt QDs @Fe-MOF exhibited perfect electrochemical performance for hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and overall water splitting. Particularly, the electrocatalyst with ultralow content of Pt QDs (1.84 μg cm −2 ) only needed the overpotential of 33 mV and 191 mV to achieve 10 and 100 mA cm −2 in 1 M KOH, respectively. In addition, the Pt QDs @Fe-MOF/NF electrodes possessed remarkable activity and stability to deliver a current density of 10 mA cm −2 at 1.47 V for overall water splitting of at least 100 h.
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MATERIALS CHEMISTRY AND PHYSICS
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2019
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IF 2.781
Jun Wei Wang,Zelong Bao,Rong Qiao Xiang,Gao Hao Hu,Yong Kang Hu,Qing Ma,Bin Li,Hong Guang Jia
As a solar energy storage medium or heat transfer medium at moderate-high temperature, the molten NaCl-MgCl 2 has the advantages of high stability and low cost. But a pipe and container material with Cr will be corroded badly in a molten chloride. Based on the founded corrosion resistance phase (Fe 0.64 Ni 0.36 ) in previous experiments, the corrosion behavior of a new alloy of Fe-37 wt% Ni with rare earth alloy element Sc in the molten eutectic NaCl-MgCl 2 at 520 °C was studied. The corrosion rate of the Fe-37 wt% Ni alloy is lower than that of the researched Fe-based superalloys (GH1035 and GH1140). After corrosion for 15 h, a porous structure with Ni-rich and Fe-depletion is formed at the local location on the Fe-37 wt% Ni surface. For the specimens with Sc (0.3 and 0.5 wt %), a compact protective MgO layer covers on the porous structure, which prevents further corrosion in the molten salt . It is speculated that the Sc is oxidized to Sc 2 O 3 directly or by the chlorination-oxidation reactions, which improves the adhesion strength between the MgO layer and the alloy matrix by the effects of inhomogeneous nucleation and pinning.
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ACS Applied Nano Materials
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2018
·
IF 0
Haijun Chen,Zhibin Zhang,Xiangxue Wang,Jing Chen,Chao Xu,Yunhai Liu,Zhimin Yu,Xiangke Wang
Magnetic Fe/Zn layered double oxide decorated carbon nanotubes (M-Fe/Zn-LDO@CNTs) composites were synthesized via a hydrothermal method with further calcination treatment. The fabricated M-Fe/Zn-LDO@CNTs were characterized by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, UV–vis spectroscopy, scanning electron microscopy, and transmission electron microscopy and then applied for U(VI) elimination under diversiform experimental conditions, such as pH, temperature, ionic strength, contact time, and coexisting ions. The experimental results demonstrated that the U(VI) adsorption performance of M-Fe/Zn-LDO@CNTs was much higher than bare CNTs. The thermodynamic parameters revealed that U(VI) adsorption on M-Fe/Zn-LDO@CNTs was endothermic and spontaneous. More importantly, the adsorption performance of U(VI) on M-Fe/Zn-LDO@CNTs was still higher than ∼89% after five cycles. Furthermore, ∼95.9% of 241Am(III) could be removed by M-Fe/Zn-LDO@CNTs from solution at pH = 8.0, which confirmed that M-Fe/Zn-LDO@CNTs was an excellent material for efficient removal of long-lived lanthanides and actinides from environmental aqueous solutions in radionuclides’ pollution remediation.
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FUEL
·
2018
·
IF 4.908
Jing Sun,Yican Wang,Wenlong Wang,Ke Wang,Jiaxin Lu
Carbon-encapsulated iron nanoparticles (Fe@CNPs) with a high degree of graphitization, good integrity in the graphite shells, and high microwave-absorbing capability were prepared by first dissolving ferrocene into organic solvent and then being carbonized by MW-metal discharges under inert atmosphere. Four different organic solvents (benzene, cyclohexane, paraffin, and anhydrous ethanol) were tested, and well-graphitized Fe@CNPs were formed when using benzene or cyclohexane as the solvent. The use of MW-metal discharges with low-toxic cyclohexane and ferrocene as raw materials provides a new method for the preparation of Fe@CNPs with the merits of simplicity, low environmental impact, and high efficiency. The fabricated Fe@CNPs have excellent microwave-absorbing capability, which is respectively 29, 19.3, and 9.7 times those of carbonyl iron powder, SiC, and carbon nanotubes after 1-min microwave irradiation at 1000 W. The thermal gravimetric analysis demonstrates that the fabricated Fe@CNPs have good thermal stability. Owing to these properties, Fe@CNPs have the potential to shape nanoscale or micron scale high-energy sites for a vast variety of applications in the field of microwave chemistry.
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Soft Matter
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2018
·Vol. 14
·期 43
·8764-8770
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IF 3.709
Botian Li,Da Xiao,Dongsheng Deng,Haimu Ye,Qiong Zhou,Liming Tang
In this study, a novel self-assembled metal–organic gel was synthesized from ferric nitrate and a di-topic ligand, bis(3-pyridyl)terephthalate. The gel consisted of a three dimensional network of uniform nanofibers. The gelation exhibited high selectivity to Fe(III) based on metal–ligand coordination. The molar ratio of Fe3+ to ligand had a large influence on the assembly process and the morphology of the gel. The metallogel displayed multi-stimuli responsiveness and excellent heat resistance, thus was further applied as a thermo-stable template for the polymerization of N,N′-methylene bisacrylamide to produce the core/shell polymer composite nanowires. Subsequently, the polymer nanotubes were obtained after ammonia post-treatment, comfirming the feasibility of the template synthesis strategy. According to the rheological measurements, the gel-like products of the composite nanowires exhibited better mechanical strength compared to the gel template.
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CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Yunfei Xue,Qian Sui,Mark L. Brusseau,Xiang Zhang,Zhaofu Qiu,Shuguang Lyu
Calcium peroxide (CaO 2 ) is a stable hydrogen peroxide (H 2 O 2 ) carrier, and the CaO 2 /Fe(II) system has been applied for treatment of various pollutants. It is commonly reported in the literature that hydroxyl radical (HO ) and superoxide radical anions (O 2 − ) are the two main reactive oxygen species (ROSs) generated in the CaO 2 /Fe(II) system. However, many of the reported results were deduced from degradation performance rather than specific testing of radical generation. Thus, the specific generation of ROSs and the influence of system conditions on ROSs yield are still unclear. To our knowledge, this is the first study specifically focusing on the generation of HO and O 2 − in the CaO 2 /Fe(II) system. Experimental conditions were optimized to investigate the production of HO and O 2 − . The results showed the influences of CaO 2 , Fe(II), and solution pH on HO and O 2 − generation, and the HO generation efficiency was reported for the first time. In addition, the ROSs generation pathways in the CaO 2 /Fe(II) system were elucidated. A strategy for enhancing HO yield is developed, based on the continuously dosing Fe(II). This proposed strategy has implications for the effective application of in situ chemical oxidation employing CaO 2 /Fe(II) for groundwater remediation.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2018
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IF 4.61
Tao Zeng,Shuqi Li,Jianan Hua,Zhiqiao He,Xiaole Zhang,Hongru Feng,Shuang Song
Nanocarbon materials are emerging as alternative activators of peroxymonosulfate (PMS) for organics decomposition. However, the relatively low activity and complex syntheses hindered their practical application and innovation with respect to rational design of carbocatalysts is highly desired. Herein, an in situ replication and transformation strategy was employed to facilely convert porous Fe 3 O 4 microspheres into novel Fe/N codoped large-pore mesoporous carbon spheres (M‑Fe/NC) as Fenton-like catalysts for PMS activation . Benefiting from the abundance of active sites induced by dual heteroatom doping, the enhanced active site exposure due to the unique mesoporous structure, and the high stability of carbon component, the derived M‑Fe/NC was superior to the pristine Fe 3 O 4 for PMS activation to degrade various organics and was efficient over a wide pH range (2–9). Compared with the proposed mechanisms of previous reports, both radical (surface-bound SO 4 − and OH) and nonradical ( 1 O 2 and direct oxidation) pathways are involved in the M‑Fe/NC/PMS system. Furthermore, experimental observations in combination with DFT calculations reveal that graphitic N and Fe N 4 sites serve as dual reaction centers in the catalysis. This research opened an avenue for development of novel multi-doped carbocatalysts used to activate PMS for sustainable remediation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Bin Hu,Jin-Yun Yuan,Jia-Yue Tian,Minghua Wang,Xue Wang,Linghao He,Zhihong Zhang,Zhuo-Wei Wang,Chun-Sen Liu
A new bimetallic Co/Fe-MOF was synthesized and phosphatized to produce a visible-light-active Co/Fe binary metal phosphide embedded in a mesoporous carbon matrix (denoted by CoP/Fe 2 P@mC). The results of X-ray diffraction and photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy reveal the formation of CoP and Fe 2 P nanoparticles together with the Co and Fe metallic state. Combining the high electron–hole separation rate of Fe 2 P@mC, fast electron transfer of CoP@mC, and the strong adsorption of mesoporous carbon, the as-prepared CoP/Fe 2 P@mC catalyst exhibits substantially enhanced photocatalytic activity toward rhodamine B (RhB) degradation under visible light irradiation. Visible light harvesting efficiency is enhanced by the suitable bandgap structure of the CoP/Fe 2 P@mC photocatalyst. Moreover, the possible photocatalytic mechanism of CoP/Fe 2 P@mC toward RhB degradation was proposed on the basis of radical trapping and electron spin resonance results. This finding illustrates a potential utilization of bimetallic MOF-derived metal phosphide as a photocatalyst to remove dye pollutants in the environment.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2018
·
IF 3.441
Bing-huang Wang,Qian Zhang,Jun-ming Hong,Ling Li
Novel iron–carbon–bentonite–alginate beads (Fe°/C-BABs) were successfully prepared with the ion-gelation method and demonstrated high activities in persulfate activation for benzalkonium chloride (BAC) oxidation. The beads were measured in terms of size, mass, and Fe content and then characterized via scanning electron microscopy, energy dispersive spectrometry, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The performance of Fe°/C-BABs as filler was evaluated in a continuous fixed-bed with paralleled PS and BAC feeding. The effects of initial PS (100 mM) concentration, pH (3–11), fixed bead weight (10–30 g), and flow rate (225-540 mL h −1 ) were investigated. Results indicated that the Fe°/C-BABs effectively activated PS to treat BAC in the solution. The optimal conditions for the degradation of BAC were pH 7.0, [BAC] = 50 mg L −1 , [PS] = 100 mM, bead weight = 30 g, PS flow rate = 25 mL h −1 , and BAC flow rate = 225 mL h −1 ; the removal rate of BAC reached 93.3%.The economic cost analysis was carried out under the optimal experimental conditions. To deeply understand the degradation mechanism of pollutants, the intermediates of BAC degradation were analyzed via gas chromatography/mass spectrometry analysis, and a degradation path pathway was proposed.
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