Preparation ZnO Nanoparticles Using Blendes as Raw Material
It is investigated systemically in this paper that the granularity of the precursor,ZnC2O4·2H2O,is influenced by synthetic conditions.Instantaneously adding of precipitation agent is able to control the mean size of precursor ZnC2O4·2H2O under 300nm,which has great function to obtain well-dispersed ZnO nanoparticles in the next step,pyrolysis.The pyrolysis kinetics model of ZnC2O4·2H2O powder is obtained.Two steps take place during the pyrolysis.The first is dehydration,which the pyrolysis kinetic model is 2(1-α)2/3(chemical reaction),A=8.3×108s-1,E=(75.82±3.00) KJ/mol.The second is formation of ZnO,which the pyrolysis kinetic model is (1-α)(random nucleation and latter growth),A=8.45×1028s-1,E=(360.54±12.00)KJ/mol.ZnO nanoparticles obtained by pyrolysis take on self-growth behavior.It is resulted that for precursor ZnC2O4·2H2O pyrolysis time takes obvious influence on the partilces size under 420℃,500℃ and 600℃.Finally,a new flow sheet for synthesis of ZnO nanoparticles is investigated,in which blendes is used as raw material and hydrometallurgy is introduced into it.The whole flow sheet has no industrial wastes,that is all byproducts can be used in the flow sheet recycled,resulted in the decrease of productive cost and industrial wastes.
ZnO Nanoparticles Precipitation Pyrolysis Precursor Blendes
W.Z.Yin Y.Z.Ding Y.X.Han
Northeastern University,Shenyang,China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3413-3421
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）