Advanced Science
·
2022
·Vol. 9
·期 22
·2201594
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IF 17.521
Rui Yang,Xiaozhong Zheng,Minkai Qin,Binbin Lin,Xiaoyun Shi,Yong Wang
Recently, extensive research efforts have been devoted to drive electrocatalytic water-splitting for hydrogen generation by electricity or solar cells. However, electricity from power grid and the intermittent property of sunlight inevitably brings about environmental pollution and energy loss. Thus, a novelty energy system for simultaneous generating H 2 from solar energy and overcoming the intermittence of sunlight is highly desirable. Herein, a self-powered energy system with solar energy as the sole input energy is successfully assembled by integrated Zn–air batteries with stable output voltage, solar cells, and water splitting electrolyzer to efficient H 2 production. Specially, the Zn–air batteries are charged by the solar cell to store intermitted solar energy as electricity during light reaction. Under unassisted light reaction, the batteries could release electric energy to drive H 2 production. Therefore, the aim for simultaneous generating H 2 and eliminating the restrictions of intermittent sunlight are realized. The solar-to-hydrogen efficiency and solar-to-water splitting device efficiency of the self-powered energy system are up to 4.6% and 5.9%, respectively. This work provides the novel design systems for H 2 production and the usage of renewable energy.
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Materials Today Nano
·
2022
·
IF 13.364
J. Wu,P. Wu,X. Weng,J. Lin,G. Owens,Z. Chen
Recently, the green synthesis of iron nanoparticles and associated hybrids using plant extracts has attracted much attention due to its low cost, simplicity and environmental friendliness . However, the exact formation mechanism is still unclear. In this study, the one step green synthesis of hybrid rGO/Fe NPs by a tea extract was examined using a response surface methodology (RSM) to obtain a high activity of rGO/Fe NPs. The results showed that the best conditions for synthesis were an extract concentration = 35 g/L, pH = 7, and temperature = 30 °C. The optimized hybrid produced could remove 99.9% of mitoxantrone (MTX) compared to only 78.9% when unoptimized. To better understand the formation process, characterizations by SEM , TEM, AFM , FTIR, XRD , Raman, and XPS were performed. Theses characterizations showed that the Fe NPs produced had a particle size of 25 nm which were deposited randomly across the rGO nanosheet with a thickness of approximately 1.5 nm, indicating that stable hybrid rGO/Fe NPs were successfully synthesized, where the green tea extract exhibited both reducing and capping/stabilizing behavior. Furthermore, the specific biomolecules in the green tea extract responsible for bio-reduction and stabilization were identified by GC-MS and LC-MS, which showed that catechins were the main reducing agents, while alkaloids, amino acids and phenolic acids were the main capping/stabilizing agents. Finally, a mechanism for synthesizing rGO/Fe NPs was proposed, where the polyphenols successfully reduced GO and complexed with iron ions to form amorphous ferric (and ferrous) polyphenol complex nanoparticles.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 13
·5147-5154
·
IF 8.067
Yanbin Chen,Hewei Yang,Jian Song,Bao Zhang
Doping metal ions into a perovskite lattice is an effective strategy for tailoring the intrinsic properties of perovskite nanocrystals (NCs). Herein, strong red-emitting and highly ambient and light stable Fe2+-doped CsPbBrI2 NCs with a maximum photoluminescence quantum yield (PLQY) of 92.1% were obtained. Systematic investigation of Fe2+ doping on the stability and the luminescence performance of CsPbBrI2 NCs was performed. Owing to the smaller ionic size compared to Pb2+, Fe2+ induced the lattice contraction and shortened the bond length of Pb–X, which suppressed the distortion of [PbX6]4− octahedra, thus improving the stability of CsPbBrI2 NCs. The champion sample could maintain up to 86% emission under the ambient conditions for 5 weeks. Besides, the incorporation of Fe2+ suppressed the formation of halide vacancies and optimized the relaxation process of CsPbBrI2, thereby contributing to the enhancement of PLQY. This facile Fe2+ doping method provides an effective strategy to synthesize stable and highly photoluminescent red perovskite materials.
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ACS Biomaterials Science & Engineering
·
2022
·
IF 5.395
Heng Liu,Mengsi Zhang,Hao Jin,Kepeng Tao,Chao Tang,Yanpeng Fan,Shuwei Liu,Yi Liu,Yuchuan Hou,Hao Zhang
Clinically, the surgical treatment of bladder cancer often faces the problem of tumor recurrence, and the surgical treatment combined with postoperative chemotherapy to inhibit tumor recurrence also faces high toxicity and side effects. Therefore, the need for innovative bladder cancer treatments is urgent. For the past few years, with the development of nano science and technology, imaging-guided therapy using nanomaterials with both imaging and therapy functions has shown great advantages and can not only identify the locations of the tumors but also exhibit biodistributions of nanomaterials in the tumors, significantly improving the accuracy and efficacy of treatment. In this work, we synthesized Fe(III)-doped polyaminopyrrole nanoparticles (FePPy-NH2 NPs). With low cytotoxicity and a blood circulation half-life of 7.59 h, high levels of FePPy-NH2 NPs accumulated in bladder tumors, with an accumulation rate of up to 5.07%ID/g. The coordination of Fe(III) and the amino group in the structure can be used for magnetic resonance imaging (MRI), whereas absorption in the near-infrared region can be applied to photoacoustic imaging (PAI) and photothermal therapy (PTT). MRI and PAI accurately identified the location of the tumor, and based on the imaging data, laser irradiation was employed accurately. With a high photothermal conversion efficiency of 44.3%, the bladder tumor was completely resected without recurrence. Hematological analysis and histopathological analysis jointly confirmed the high level of safety of the experiment.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Li-hu Qian,Wei-wei Dong,Hai-bin Li,Xiaojie Song,Yi Ding
The development of economical, efficient and stable non-noble metal catalysts plays a key role in electrocatalytic hydrogen evolution . NiCo 2 S 4 has been proved to be an efficient non-noble catalyst, to further improve its electrocatalytic performance is a meaningful work. In this paper, the effects of Fe doping on electrochemical performance of NiCo 2 S 4 is investigated. The Fe-doped NiCo 2 S 4 catalyst is prepared by a facile solvothermal method with metal-organic-framework (MOF, ZIF-67) as template, and it exhibits an improved hydrogen evolution reaction (HER) performance with an overpotential of 181 mV at 10 mA cm −2 , a Tafel slope of 125 mV dec −1 compared with that of NiCo 2 S 4 (252 mV overpotential and 149 mV dec −1 Tafel slope). The combination of improved conductivity, mesopores architecture retained with the ZIF-67 template, which result the reduced internal resistance, enhanced charge transportation as well as large electrochemical double-layer capacitance. This work provides an effective and synergistic strategy for fabricating NiCo 2 S 4 -based catalysts toward electrochemical water splitting.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Fengxia Wang,Hui Hu,Xin Feng,Xu Ding,Wei Wang,Ji Zhang
Concerning chemical hazards, natural materials-based fabrication is highly praised for their safer and environmental-friendly fabrication. In this study, Au and Pd were modified on Fe nanoparticles , which was reduced by tea polyphenols. The as-synthesized probe (Tp-Fe/AuPd), was applied for hydrogen peroxide (H 2 O 2 ) detection. Physical characterizations showed that Au and Pd were successfully modified on the Fe nanoparticles surfaces. The electrochemical results showed that, Tp-Fe/AuPd demonstrated good anti-interference capacity, long-term stability and high sensitivity of 4.17 μA mM −1 cm −2 . Further, the probe can detect H 2 O 2 within concentration range of 0.1–10 mM, and an estimated limit of detection (LOD) of 9.53 mM, without the addition of enzymes or other extraneous materials.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Pengfei Cheng,Zhipeng Lin,Xuqiang Zhao,Michael Gatheru Waigi,Galina K. Vasilyeva,Yanzheng Gao
Manganese oxides (Mn oxides) are ubiquitous and may coexist with Fe(III) ions in soil environments. In this study, acid birnessite , alkaline birnessite, cryptomelane, pyrolusite, manganite , and their Fe(III)-modified analogues were synthesized and used for benzo(a)pyrene transformation. Fe-modified Mn oxides show a markedly enhanced transformation capability towards benzo(a)pyrene. Specifically, the benzo(a)pyrene transformation rate constants k for Bir-H, Bir-OH, Cry, Pyr, and Man were 0.49, 0.080, 0.0071, 0.0055, and 0.0022 h −1 , respectively. After Fe(III) modification, the transformation rate constants were increased to 22, 2.7, 0.25, 0.0072 and 0.0098 h −1 , respectively. Fe(III)-modified layered birnessites exhibited better activity than Fe(III)-modified tunnel Mn oxides, which was attributed to their high Fe(III) contents and abundant active free radicals. Fe(III) was found to accept electrons from benzo(a)pyrene, thereby accelerating the benzo(a)pyrene transformation. Moreover, modification with Fe(III) increased the surface adsorbed water and oxygen, and promoted the generation of active free radicals. Finally, the physicochemical and biochemical properties of transformation products showed the environmental benefits of this process. Overall, the results indicate that the occurrence of Fe(III) ions could promote the removal of PAHs in Mn oxides-rich soils, and this study provides a credible understanding of PAH fates in natural soils.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiangya Ma,Rui Zhang,Wei Xia,Yanli Kong,Yong Nie,Yahua Zhou,Chi Zhang
A novel covalently bonded composite coagulant CAFM was synthesized by using inorganic PAFC and organic CPAM through UV initiation. The algae and turbidity removal efficiency were investigated by using CAFM in algae-laden water coagulation process. The Al/Fe residual and algae flocs size were also examined. Results showed that 96% chlorophyll a and 87% turbidity were removed by using CAFM at dosage of 40 mg/L. The removal efficiency was larger than that by using PAFC or CPAM at their optimal dosage. The minimum Al residual of 12.47 μg/L, Fe residual of 9.64 μg/L together with the most compact algae flocs were achieved by using CAFM 0.6 , which was great favorable and essential for drinking water treatment . Finally, the charge neutralization of PAFC and bridging of CPAM synergetic contributed to algae harvesting.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Kang Ji,Junpeng Wang,Ping Yang
Modulation of oxygen intermediates in the oxygen evolution reaction (OER) tends to be an effective method for intensifying OER activity. In this paper, NiCo nanolayered double hydroxide (NC-LDH)-decorated FeNi bimetallic metal–organic framework (FN-MIL) heterostructures were constructed for enhanced OER performance. Various characteristics including Raman and Fourier-transform infrared spectra, X-ray diffraction patterns, scanning and transmission electron microscopy images, and X-ray photoelectron spectroscopy spectra help to explore the composition and microstructure. The band gap of samples was discussed using Mott–Schottky curves and Tauc plots to analyze the interfacial electron transfer driven by the energy level difference, resulting in the formation of electron-rich and electron-deficient regions at the interface and realizing the directed modulation of oxygen intermediates. The as-prepared composite catalyst revealed excellent OER performance, long-term stability, a high faradic efficiency of 97.8%, and a low potential of 244 mV at 10 mA cm–2 (without iR-compensation). Interestingly, the catalyst maintained high OER activity in seawater containing 1 M KOH due to its favorable resistance to chloride ions, suggesting an appealing prospect in practical application.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Naiyun Liu,Ruqiang Wu,Yixian Liu,Yunliang Liu,Peiji Deng,Yaxi Li,Yongchao Du,Yuanyuan Cheng,Zechao Zhuang,Zhenhui Kang,Haitao Li
Electrochemical nitrogen reduction reaction (NRR) is a promising method for ammonia synthesis under ambient conditions. However, the NRR performance is limited to an extremely strong N≡N bond in N2 and the competing hydrogen evolution reaction. Introducing oxygen vacancies (OVs) has been considered as a forceful means to accelerate the sluggish NRR reaction kinetics. Herein, we reported the design of Fe-doped NiMoO4 catalysts for NRR. Fe doping can increase the amount of OVs in the catalyst and contribute to lattice strain enhancement, thereby leading to the improvement of the electron transport rate and catalytic active for NRR. In 0.1 M Na2SO4 solution, the 5% Fe-NiMoO4 catalyst achieves a NH3 yield rate of 15.36 μg h–1 mgcat.–1 and a Faradaic efficiency of 26.85% under −0.5 V versus RHE. Furthermore, the 5% Fe-NiMoO4 catalyst exhibits excellent stability (up to 13 h) during the reaction.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Cong Pan,Libin Fu,Fenna Lide,Yaobin Ding,Chengjun Wang,Jia Huang,Shaobin Wang
Reduction of bromate (BrO 3 − ) by various technologies has been extensively investigated, while the fate of oxygen and bromine atoms in BrO 3 − in these processes has been largely ignored. In this study, reduction of BrO 3 − by Fe(II) ions was investigated under various conditions via electron spin resonance (ESR), laser flash photolysis (LFP), probe of phenol and quenching experiments. It was found that reduction of BrO 3 − by Fe(II) ions produced HO•, O 2 • − and reactive bromine species (eg., Br• and Br 2 • − ). HO• and O 2 • − were generated from release of one/two oxygen atoms in BrO 3 − and its reduction intermediates (BrO 2 − and BrO − ) at one time, while Br• and Br 2 • − were generated from activation of hypobromous acid by Fe(II) and reactions of HO• with formed Br − . Due to the formation of these reactive species, the tested ten organic pollutants with diverse structures can be efficiently degraded, which including carbamazepine (CBZ), ibuprofen, phenol, benzoic acid, paracetamol, bisphenol a, 4-chlorophenol, oxcarbazepine, diclofenac and sulfamethoxazole. CBZ degradation intermediates by BrO 3 − /Fe(II) system were specially identified by liquid chromatography (LC)-mass spectrometry (MS), and three pathways of hydroxylation/nitrosylation, ring contraction-amine cleavage and bromination for CBZ degradation were proposed accordingly. This study might shed new fundamental insights to bromate reduction and its implication for transformation of co-existed organic pollutants.
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Journal of Physical Chemistry C
·
2021
·
IF 4.126
Yao Li,Le Xin Song,Wei Ping Wang,Yue Teng,Juan Xia,Nan Ning Liu
In this work, we prepared a series of Fe-MOF polyhedra [metal organic framework (MOF)-1 ∼ −13] by introducing β-cyclodextrin (CD) as a morphology modifier using an interaction between ferric chloride and terephthalic acid in dimethylformamide. A novel structural evolution from a hexagonal bipyramid to a bipyramidal hexagonal prism was clearly observed. This evolution was gradual and could be well reflected by the height ratio of the prism and pyramid in these polyhedral structures. It is the relative concentration of β-CD that drives this structural evolution. Although the reaction temperature and time can also affect the height ratio to some extent, their influence can only be realized in the presence of β-CD. In the absence of β-CD, only hexagonal bipyramid structures were obtained. It is worth noting that Fe-MOF-1 with a bipyramidal hexagonal prism structure (prism height, ∼130 nm) showed typical paramagnetic characteristics, and its saturation magnetization was determined to be 23.1 emu·g–1. Furthermore, we found that Fe-MOF-1 exhibited good photocatalytic performance for different types of dyes (crystal violet with positives and methyl orange with negative charges). At the same time, a possible photocatalytic mechanism was proposed to explain the difference of degradation efficiency between the two dyes. Also, we use the combination of specific surface area and zeta potential to explain the differences in the catalytic properties of a series of Fe-MOF materials. In addition, MOF-1 shows the same electrocatalytic oxygen evolution reaction performance as some bimetallic MOFs such as Fe-Co-MOF. For example, the overpotential of MOF-1 is 398 mV at 10 mA·cm–2 current density, while that of Fe-Co-MOF is 410 mV. We believe that the current work can contribute to the adjustment, modification, and application of MOF nanostructures.
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