CHEMOSPHERE
·
2021
·
IF 7.086
Chao Xue,Wanling Cai,Xiulan Weng,Gary Owens,Zuliang Chen
The use of biomass for the synthesis of value-added products, such as functional nanomaterial for the removal of contaminants, is a challenge. In this study, hybrid bimetallic Fe/Ni nanoparticles and reduced graphene supported bimetallic Fe/Ni nanoparticles (Fe/Ni-rGO) were prepared via a one-step green synthesis using green tea extract, and thereafter evaluated for the simultaneous removal of rifampicin (RIF) and Pb(II) from aqueous solution. The efficiencies of Pb(II) and RIF removal by Fe/Ni-rGO were 87.5 and 96.8%, respectively. The removal performance of the hybrid Fe/Ni-rGO was better than either n Fe/Ni, rGO, or Fe-rGO. Detailed characterization and analyses of Fe/Ni-rGO indicated that both Fe and Ni nanoparticles were evenly distributed over the surface of rGO and that aggregation of Fe, Ni nanoparticles, and stacking of rGO in the hybrid were decreased. Furthermore, while LC-TOF-MS analysis showed that RIF was degraded into small-molecule fragments, XPS showed that Pb(II) was not reduced to Pb 0 . The major conditions impacting removal efficiency, adsorption kinetics, and fit to adsorption isotherm models were examined to better understand the removal mechanism. While the adsorption of both contaminants fit well a pseudo-second-order kinetic model, the adsorption of RIF fit the Freundlich isotherm model best, while the adsorption of Pb(II) fit the Langmuir isotherm model best. Thus, the removal mechanism of both contaminants firstly being chemical adsorbed onto the surface, while n Fe/Ni continues to participate in the catalytic reduction of RIF. Moreover, Fe/Ni-rGO could be reused and performed well for wastewater treatment , thus suitable as a practical resource recycling technology .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Jiaxing Wang,Shuping Zhang,Yinhai Su,Shuguang Zhu
Carbon-based metal catalyst has attracted wide attention in the utilization for tar catalytic cracking because of its high hierarchical porous structure and high dispersion of metal particles. In this study, sawdust was used as raw material to prepare Fe embedded graphene nanoshell/carbon nanofibers catalyst for catalytic cracking of biomass tar by impregnation followed by carbothermal reduction in CO 2 atmosphere. The properties of the catalysts were evaluated by a variety of characterization methods and based on which the evolutionary mechanism was proposed. CO 2 etching improved the porosity (V total = 0.4187 cm 3 /g and BET surface area = 225.93 m 2 /g) and increased the content of Fe 0 . During CO 2 etching and catalysis of FeCl 3 , the prepared catalyst formed a structure in which a large amount of carbon nanofibers/graphene shells wrapped metallic iron deposited on the porous carbon support. The stacking of carbon nanofibers enhanced the adsorption capacity of the catalyst to tar macromolecules. The coating of the graphene shell to the metal nanoparticles prevented the agglomeration and sintering of metal active sites, which increased the stability of the catalyst. The results indicated that the Fe@C800C1 catalyst showed good catalytic performance at 700 °C, and the tar conversion efficiency reached up to 90.4%. After 4 cycles, the tar removal efficiency still maintained at 90.0%.
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Qing Zhang,Yi Zhai,Fumin Wang,Xubin Zhang,Guojun Lv,Yongkui Liu,Mengyue Li,Mengyao Li
Hierarchical Fe-doped MFI/MCM-41 composites (Fe-HMZs) were one-pot hydrothermal synthesized by partial transformation strategy using conventional CTAB as a dual-functional template. The hierarchical Fe-doped MFI/MCM-41 composites possess ordered mesopores and crystallized MFI structure. The effect of addition amount of NaOH and CTAB as well as the type of the alkali source on the formation of hierarchical Fe-MFI/MCM-41 composites have been investigated in detail. In addition, the temperature-gradient treatment plays the vital roles in the formation of MFI and the possible formation mechanism has been proposed. The obtained hierarchical Fe-HMZ-40 sample exhibits outstanding catalytic performance for phenol hydroxylation and 48% of phenol conversion as well as 89% of dihydroxybenzene selectivity could be achieved, which are ascribed to the more accessible active sites endowed by the significant diffusion ability of ordered mesopores. Compared with Fe-MCM-41 sample, the hydrothermal stability is improved because of the presence of MFI structure.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Richao Niu,Rubing Han,Yin Huang,Liming Dai,Hongan Zhao,Yining Wang,Junwu Zhu,Shaochun Tang,Jingwen Sun
Bimetallic compounds can offer higher electrochemical activity and capacity than monometallic ones owing to their rich chemical valences. Herein, the performance enhancement of monometallic compounds by introducing metal ions was demonstrated, and the effects of different metal ions were investigated. Through introduction of metal ions into LDHs under a hydrothermal environment, one kind of 2D/2D hierarchical CoM-LDH(M=Fe or Mn)/MXene composites were successfully synthesized. It was found that the introduced Fe ions extremely improves the specific capacity and the introduced Mn ions extremely enhances the rate capability of monometallic composite. The fabricated CoFe-LDH/MXene (CF-MX10) electrode exhibits a specific capacity of 808 F g −1 at current density of 0.5 A g −1 , much higher than that of CoMn-LDH/MXene (CM-MX10, 562 F g −1 ) and Co(OH) 2 /MXene (C-MX10, 270 F g −1 ). The high areal capacity or rate capacity are attributed to strong synergistic effect between CoM-LDH and MXene, as well as the introduction of metal ions that change the architecture and the electronic or ionic conductivity , which leads to much improved electrical conductivity and electrochemical stability.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Bao Liu,Sichao Lou,Yang Zeng,Yan Qin,Wenqing Zhang,Lingfan Zhang,Xin Liu
In this study, Fe-Zr-La tri-metal oxide (FZLO) composite was synthesized by co-precipitation method as new complex adsorbent for effective phosphate removal from aqueous media. The scanning electron microscopic study revealed that the adsorbent was of amorphous structure and consisted of the inhomogeneous aggregated nanoparticles with different sizes. Various influencing parameters such as pH values, initial concentration of phosphate ions, contact time, temperature and co-existing anions were studied to perform batch adsorption experiments. The experimental results demonstrated that the adsorption process was highly pH-dependent and obtained the maximum phosphate adsorption capacity of 101.0 mg g −1 at pH = 6. The adsorption process occurred on surface of FZLO composite has been found to be mono-layered and chemisorption dominated in nature as the data fitted well to Langmuir isotherm as well as the pseudo-second-order kinetic model. The structure and properties of the adsorbent before and after adsorption using FT-IR, XRD and XPS techniques suggested that the adsorption mechanisms involved electrostatic attraction, complexation and ligand exchange. After the adsorption, the remained P concentration met the permissible limit by the Environmental Protection Agency. The Fe-Zr-La tri-metal oxide composite could be a promising adsorbent for phosphate removal from aqueous media.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiahao Wei,Jingtao Bi,Longfei Zhang,Dandan Han,Junbo Gong
Constructing a robust catalytic membrane with simultaneous fast liquid transport and efficient organic pollutant degradation is appealing for efficient organic wastewater treatment. Herein, Fe-doped CoTiO 3 grew uniformly on the SiO 2 fiber membrane to form a catalytic membrane (FCTSM). Benefiting from the great water wettability, FCTSM facilitated fast water transport with low energy consumption and exhibited high physical separation performance (98.4% rejection of oil in the emulsion). The catalytic active sites were fully exposed on membrane surface, which could easily react with peroxymonosulfate and target pollutants. Under the gravity-driven permeation, FCTSM performed decent catalytic degradation property (e.g., 96.3% removal of nimesulide with the flux of 300 L/m 2 ·h) in the presence of peroxymonosulfate. Electron paramagnetic resonance (EPR) spectra and quenching tests found that SO 4 •− and 1 O 2 were involved in pollutant degradation, and the possible degradation pathway of nimesulide was investigated. Besides, the toxicity analyses based on quantitative structure–activity relationship (QSAR) verified the reduced toxicity of degradation products. This work provides an insight into the design of multifunctional membranes and advances the potential applications of heterogeneous catalytic oxidation in environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Weiye Wang,Qingliang Zhao,Jing Ding,Kun Wang,Junqiu Jiang
Bio-electro-Fenton powered by microbial fuel cell (MFC-powered BEF) can in-situ generate and utilize hydrogen peroxide to degrade refractory pollutants. Most of the previous works loaded transition metal on the cathode to participate in the Fenton reaction showed limited electrical or degradation performance. The coupling of alkaline-earth metal (Mg 0 and MgO) and transition metal on cathode could improve the electrochemical and catalytic properties of MFC-powered BEF system, which had not been reported so far. In this research, a novel cathode of Fe–Mn–Mg/carbon fiber (Fe–Mn–Mg/CF) was developed with good polymerization effect of Mg to Fe and Mn, and outstanding production of reactive oxide species (•OH and •O 2 − ), which further improved the overall electricity generation efficiency and enhanced the degradation of pollutants. Accordingly, the maximum power density generated in MFC-powered BEF system with Fe–Mn–Mg/CF cathode was 2.07 times higher than that of the frequently used Fe–Mn/CF. Owing to the superiority of surface holes and MgO in H + adsorption and electron transfer , the integration of Fe, Mn with Mg promoted the in-situ generation of H 2 O 2 and active radicals, resulting in the highest catalytic performance of degrading refractory pollutants . Initial pH, external resistance, initial concentration of contaminant and cycle use frequency of cathode were also evaluated on the degradation efficiency of the BEF system. Furthermore, reaction and degradation mechanisms were proposed from H 2 O 2 production and free radical characterization. Overall, this study provided a novel cathode preparation approach for the MFC-powered BEF system, which vastly promoted its electrochemical and catalytic properties.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Lizhen Guo,Yuqi Wang,Meng Wang,Hiba Shaghaleh,Yousef Alhaj Hamoud,Xu Xu,He Liu
With the severe shortage of water resources and the low utilization efficiency of fertilizer, slow-release fertilizer equipped with water-absorbing and water-retaining capacity has captured much attention. Herein, by integrating metal-organic frameworks (MOFs) with cellulose nanofibres (CNFs) and sodium alginate (SA), a novel cellulose-based hydrogel (MIL-100(Fe)@CNF-SA) was fabricated that acted as a carrier for urea. The resultant hydrogel was not only qualified with a high surface area of 129.17 m 2 /g but also affluent in the hydrophilic groups . In parallel with the good water-holding capacity of 55% when the loading of the resultant hydrogel was only 0.5 g, the complete loss of the water in the treated soil was successfully slowed down by nearly 20 d compared with the soil without treatment. Urea (1.47 g/g) could be captured in the composite hydrogel , wherein the slow release of urea was achieved due to the synergism of the highly porous structure of the hydrogel and the crystals with a high specific surface area. Moreover, the positive effect of the resultant hydrogel on the growth of wheat was indexed to the germination rate, number of tillers, photosynthetic rate and chlorophyll content of the crop, which verified their further application in irrigating farming.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yaru Wang,Jiaqin He,Xunxun Li,Mengmeng Wang,Yuanbo Zhou,Jun Xiao,Dongyun Chen,Jianmei Lu
MnO2 nanotubes loaded with Pt and Ni–Fe spinel were synthesized using simple hydrothermal and sol–gel techniques. After loading with Ni–Fe spinel, the specific surface area of the material increases 3-fold. This change helped to provide more active sites and facilitated the association between the catalyst and volatile organic compounds (VOCs). X-ray photoelectron spectroscopy determined that the adsorbed oxygen concentrations were all greatly increased after Pt loading, indicating that Pt promoted the adsorption of oxygen and so accelerated the combustion process. The performance of the catalyst after loading with 2 wt % Pt was greatly improved, such that the T90 for benzene decomposition was decreased to 113 °C. In addition, the 2% Pt/2Mn@NFO exhibited excellent low-temperature catalytic activity when reacting with low concentrations of toluene and ethyl acetate. This work therefore demonstrates a viable new approach to the development of Mn-based catalysts for the low temperature catalytic remediation of VOCs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SN Applied Sciences
·
2019
·Vol. 1
·期 10
·1-11
·
IF 0
Geng Yuqing,Wang Zhiwei,Wang Yahuan,Song Jiayang,Chen Zhimin,Chen Jiafu,Chen Yong,Fu Jianwei
The development of excellent dye adsorbent with high adsorption capacity and good separation function is imperative to clean the wastewater. Herein, an innovative magnetic Fe–Fe 2 O 3 @poly(cyclotriphosphazene- co -polyethyleneimine) (named as Fe–Fe 2 O 3 @PCP) composite was fabricated through a facile copolymerization between hexachlorocyclotriphosphazene and polyethyleneimine in the presence of Fe–Fe 2 O 3 nanoparticles. With the help of scanning electron microscope, transmission electron microscope, Fourier transform infrared spectroscope and vibrating sample magnetometer, the microstructure of the resulting magnetic Fe–Fe 2 O 3 @PCP composite was characterized. Then, the adsorption performance of magnetic Fe–Fe 2 O 3 @PCP composite was evaluated by removing anionic dye acid chrome blue K (ACBK) from aqueous solution. The effects of contact time, initial solution pH and temperature on the adsorption of ACBK onto magnetic Fe–Fe 2 O 3 @PCP composite were systematically studied. The kinetics, isotherms and mechanism of the adsorption process were analyzed. Results show that the maximum adsorption capacity of the magnetic Fe–Fe 2 O 3 @PCP toward ACBK dye could be up to 260 mg g −1 at 25 °C in neutral solution. The adsorption kinetics follows both the pseudo-second-order kinetic model and the Weber’s intraparticle diffusion model well. And the Freundlich isotherm model can nicely fit the adsorption equilibrium data. The electrostatic attraction between Fe–Fe 2 O 3 @PCP and ACBK plays a dominant role in the adsorption process. Moreover, the magnetic Fe–Fe 2 O 3 @PCP composite owns a high saturation magnetization of 30.1 emu g −1 , rendering it rapid magnetic separability and good reusability. After five adsorption–desorption cycles, the magnetic composite still kept 75% of removal efficiency with the adsorption capacity of 195 mg g −1 . The excellent adsorption capacity and good magnetic separability make the magnetic Fe–Fe 2 O 3 @PCP composite a promising adsorbent for efficient removal of anionic dyes including ACBK from contaminated wastewater.
✓ 已验证
产品关联
DOI
Catalysts
·
2019
·Vol. 9
·期 11
·906
·
IF 3.444
Jieyang Yang,Zequan Zeng,Zhanggen Huang,Yan Cui
In this work, the activation effect of vacuum thermal treatment on MIL-101(Fe) (MIL: Materials of Institute Lavoisier) was investigated for the first time. It demonstrated that vacuum thermal activation could accelerate the activation of persulfate (PS) by MIL-101(Fe), and the enhancement of the catalytic capacity of MIL-101(Fe) was mainly attributed to the change in the FeII/FeIII mixed-valence center. The results of the SEM and XRD showed that vacuum thermal activation had a negligible effect on the crystal structure and particle morphology of MIL-101(Fe). Meanwhile, the higher temperature of vacuum thermal activation caused a higher relative content ratio of FeII/FeIII. A widely used azo dye, X-3B, was chosen as the probe molecule to investigate the catalytic performance of all samples. The results showed that the activated samples could remove X-3B more effectively, and the sample activated at 150 °C without regeneration could effectively activate PS to remove X-3B for at least 5 runs and approximately 900 min. This work highlights the often-overlooked activation effect of vacuum thermal treatment and provides a simple way to improve the catalytic capacity and reusability of MIL-101(Fe) which is beneficial for the application of MIL-101(Fe)/PS systems in azo dye wastewater treatment.Keywords:vacuum thermal activation;MIL-101(Fe);persulfate;azo dye
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Jie Xu,Mingshuo Wang,Fei Yang,Xiaoqian Ju,Xilai Jia
Structural and compositional modulation of low-cost hydroxide is important for making efficient electrocatalysts of the oxygen evolution reaction (OER), and it is an ongoing challenge. Here, Ni–Fe–W hydroxide complex by incorporation of tungsten into nickel–iron layered double hydroxide was proposed and investigated. As-formed Ni–Fe–W hydroxide nanosheets are highly porous and self-supported on the carbon fiber substrates, which promote the exposure of the active metal sites for significantly enhanced OER activity. Moreover, the as-introduced tungsten is evidenced to be in a W6+ oxidation state which can facilitate charge transfer and electron capture and thereby decrease the critical conversion barrier of the absorbed OH– to O radical in OER. A series of Ni–Fe–W hydroxides were prepared, with the best molar ratio of Ni–Fe–W sources being 6:2:1. The optimal Ni6Fe2W-LDH@carbon fiber electrode delivers a low overpotential of 264 mV at 10 mA cm–2 and high stability (only 1.6% of the potential increase after 10 h) in alkaline electrolyte. Moreover, the structure of the constructed Ni–Fe–W hydroxide is evidenced to be stable and important for the electrocatalytically stable. The study is expected to open a new avenue in developing multiple hydroxides for low-cost and efficient electrocatalysts.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）