Nanometer Oxide On The Research And Application Of Heavy Metal Ions Adsorption Performance

Spectrophotometric method by measuring the absorption degree of the substance tobe measured at a particular wavelength or wavelength range of light absorption degree,is qualitative and quantitative analysis method, its application range includes ultravioletregion, visible region, infrared region. Ultraviolet-visible absorption spectroscopy is akind of long history and extensive application of the analysis method of the instrument,it is relatively simple, easy operation, easy popularization, and low price.In addition, thetraditional separation and enrichment techniques may be slow to respond, lowsensitivity, poor selectivity of the shortcomings, but the application of nanomaterials fortrace substances, in varying degrees, rapid detection of these defects can be improved toget the desired results. Nanomaterials as sorbents for the separation and enrichment anddetection of plant waste, domestic water has become the focus of research scientists.In this paper, the self-made CeO₂and ZrO₂nanoparticles were applied in field ofanalytical determination, and the adsorption characteristics of some trace elements onnanometer oxide was systematically studied with spectrophotometric method. Themajor contents in this dissertation are described as follows:The samples of CeO₂nanoparticles were synthesized by low thermal solid-phasemethod. The products were characterized by XRD and SEM. The spherical sampleswere little agglomeration and the particle diameter is in the5-10nm region. So it is aideal material. The module studied the nanoparticle cerium oxide of chromiumadsorption of heavy metal ions, and its system research by spectrophotometric method.The method has been applied for the determination of trace Cr6+in water samples withsatisfactory results.The recoveries of Cr6+were99.6%and99.4%. The detection limit ofthis method for Cr6+was0.01mg/L（n=9）, and relative standard deviation was2.3% （n=10）.The portion learnt the nanoparticle cerium oxide of copper adsorption of heavymetal ions, and its system research by spectrophotometric method. Effect of pH, andadsorption capacity for preconcentration of trace elements were discussed. Thedetection limit of this method for Cu²⁺was0.01mg/L（n=9）, and relative standarddeviation was1.8%（n=10）. The method has been applied for the determination of traceCu²⁺in water samples with satisfactory results.The recoveries of Cu²⁺were98.1%and96.2%.The samples of ZrO₂nanoparticles were prepared by hydrothermal method. Theproducts were characterized by XRD and TEM. The products has well-proportioneddiameter and little agglomeration.So it is applicable for solid phasead sorbent. Effect ofpH, adsorption capacity and various coexisting ions for preconcentration of traceelements were discussed. The detection limit of this method for Cd²⁺was0.03mg/L（n=9）, and relative standard deviation was1.6%（n=10）.