Preparation Of Iron Group Metal And Their Compound Composites And Study Of Their Dye Treatment And Electrochemical Performance

This paper studies the preparation methods of iron group metal and their compound composites corresponding to Fe,Co,Ni,and Mn elements and their applications in dye treatment and supercapacitors.Fe_0.32Co_0.68 binary metal nanoparticles synthesized at room-temperature were loaded on a novel hierarchical follower-like ?-Al2O3@C composite which can improve the stability and dispersity of Fe_0.32Co_0.68 nanoparticles.The fresh prepared Fe_0.32Co_0.68/?-Al2O3@C shows good adsorption performance for Orange II?100 mg L-1,973.55 mg g-1?.Later,the used Fe_0.32Co_0.68/?-Al2O3@C adsorbent?Fe-Co oxide/?-Al2O3@C?was reused as a peroxymonosulfate?PMS?catalyst.Amazing experimental results exhibit that Fe-Co oxide/?-Al2O3@C can highly efficiently decompose Orange II?60 mg L-1,1 min;90 mg L-1,2 min,120 mg L-1,7 min and 150 mg L-1,10 min?as a PMS catalyst,which also exhibits better generalization for the degradation of different organic pollutants and excellent reusability?98%,tenth cycle?due to the structural stabilities of ?-Al2O3@C.Furthermore,a successive experiment was carried out to treat high-concentration of Orange II?200 mg L-1?by Fe_0.32Co_0.68/?-Al2O3@C nanocomposite.After adsorption,the PMS was added,then 98% of degradation rate could be got within 5 minutes.The combination of adsorption and PMS advanced oxidation technique of this nanocomposite may be one of the effective ways to deal with high-concentration dye wastewater.A one-pot hydrothermal reaction with low cost was employed to prepare the distinct composite of sheet-membrane Mn-doping Ni?OH?2 with encapsulated Ni3S2 nanoparticles?Ni Mn-1?.Inner large nanosheets and outer ultrathin membranes as well as encapsulated Ni3S2 nanoparticles form this 3D porous structure,which contributes to provide abundant active area to participte in the electrochemical reaction.Meanwhile,Ni Mn-1 is a Mn-doping Ni?OH?2/Ni3S2 composite,which is in favour of generating diversiform valence transition and enhancing conductivity.Directly emplyed in supercapacitive electrode,Ni Mn-1 displays ultrahigh capacitane of 3228 F g-1 at 0.68 A g-1,suitable rate perforamnce?reach 81.3% at 10.2 A g-1 and 56.7% at 34 A g-1?,and great cycling duration of 95.6% after 3000 cycles.Furthermore,a hybrid supercapacitor device based on advanced Ni Mn-1 material was developed.The device possesses high energy density of 51.5 Wh kg-1 at a power density of 404 W kg-1 and suitable long-term cycling stability of 85.3% after 5000 cycles.Therefore,all of these further suggest the enourmous advantage of Ni Mn-1 material in the energy-storage field.The methods for the preparation of these metal and metal compound composite materials in iron group?Fe,Co,Ni,Mn?in this paper are simple,and the synthetic raw materials are inexpensive and environmentally friendly.The adsorbent material Fe_0.32Co_0.68/?-Al2O3@C shows a higher adsorption efficiency for Orange II.The catalyst material Fe-Co oxide/?-Al2O3@C exhibits a strong PMS catalytic degradation efficiency for various dyes.And the Ni Mn-1 electrode material exhibits a high energy storage capability.These advantages make them play an important role in alleviating the environmental problems and energy crisis.