Synthesis And Properties Of Fe-based Nanocomposites

In recent years,due to the excessive consumption of energy and the deterioration of environment,people have paid more and more attention on the governance of environmental and the development of clean energy.Handle and solve the water pollution have became the priority of the environmental problem.At present,photocatalysis and adsorption are considered to the common,fast and simple methods of sewage treatment.In respect of the development of new energy,hydrogen is a well-known clean energy all around the world with the advantage of cleaning,abundance and renewability.Producing hydrogen by water electrolysis stand out from numerous methods,which excels in simple equipment,clear products and free of environment containment.Up to now,the photocatalysis,adsorption and water electrolysis technology have been widely studied and have achieved some achievements,but there are still many shortcomings which need to be resolved.For example,the charge transfer in the process of photocatalytic efficiency is low,the maximum adsorption capacity of adsorbents still need to be improved,and the high energy consumption,high cost,low efficiency problem of water electrolysis.Fe-based nanomaterials,due to abundant in the earth and have unique physical and chemical properties,are widely used in photocatalysis,dye adsorption,water electrolysis and many other fields,Fe-based nanocomposites are comprised of Fe-based nanomaterials,which integrated the advantages of its each components and own favorable competitive advantage in solving the problem of environmental and energy,at the same time,they are also the development direction of new materials.In this paper,we explored a series of Fe-based nanocomposites,mainly on the preparation process and their application to photocatalytic,the adsorption of dye and the oxygen evolution reaction.The contents of this paper including the following three parts:1.A Facile Sacrificial Template Method to Synthesize One-dimensional Porous CdO/CdFe₂O4 Hybrid Nanoneedles with Superior Adsorption PerformanceIn this work,we have developed a facile sacrificial template method to prepare one-dimensional?1D?porous CdO/CdFe₂O4 hybrid nanoneedles?HNNs?with uniform pore size distribution and structural stability for the first time.The solid 1D Cd2Fe?CN?6 NNs with smooth surface are first synthesized and used as sacrificial templates through a simple low-temperature hydrothermal process.After thermal treatment,the solid precursor NNs can be transformed into the corresponding porous CdO/CdFe₂O4 HNNs.Due to the large-scale production and unique structural features,the as-prepared porous CdO/CdFe₂O4 HNNs can serve as a highly efficient adsorbent toward removal of Congo red?CR?from aqueous solution with maximum adsorption capacity of 1491 mg g-1.Furthermore,the adsorption process of CR on porous CdO/CdFe₂O4 HNNs was systematically carried out,indicating that the Langmuir model and the pseudo-second-order kinetics model can well describe the adsorption behavior.The result demonstrates that the as-prepared porous CdO/CdFe₂O4 HNNs may be a promising candidate in dye effluent treatment.2.Synthesis of CdFe₂O4/CdS/PANI nanocomposite with improved photocatalytic abilityIn this work,we choose the as-prepared FeOOH nanorods as a template,Firstly,growthed CdS particles on its surface,and then transformed it into binary composite CdFe₂O4/CdS nanorods by calcined in nitrogen atmosphere,Finally,the polymer polyaniline?PANI?were coated and forming CdFe₂O4/CdS/PANI ternary composite nanorods,which showed good catalytic effect in the photocatalytic degradation of organic dyes RhB.Different quality percentage of PANI can affect the performance of photocatalytic,and we found the optimum proportion of PANI was 9%.The cycle test showed that CdFe₂O4/CdS/PANI ternary composite material had good stability.3.The preparation of Ni₂P nanosheet/FeP nanospindle binary heterostructured nanomaterials for oxygen evolution reaction.In this chapter,FeOOH nanospindle template was prepared by a simple hydrothermal method and then vertical growth NiSiO3 nanosheet on the surface of FeOOH nanospindle after several steps ' Finally,Ni₂P nanosheet/FeP binary heterostructure nanomaterials were prepared by a simple phosphating method.The as-prepared FeP/Ni₂P showed excellent catalytic performance and stability of oxygen evolution reaction?OER?.