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Foam-like Cu-Zn Alloy Filter Material Preparation and It’s Properties of Water Purification

Author: XieDingLu
Tutor: SuiXianDong
School: South China University of Technology
Course: Materials Processing Engineering
Keywords: Foam-like Cu-Zn alloy filter material residual chlorine removal heavy metal Cr6+ removal heavy metal Pb2+ removal
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 110
Quote: 0
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Abstract


Cu-Zn alloy filter material widely applied in the water treatment industry because of its unique electrochemical characteristics. compared with conventional filter material, Cu-Zn alloy filter material has the follow advantage: long usage life, 100 % renew capability; can effectively reduce or remove the chlorine and heavy metal; can effective control microbial and boiler scale; has good effect of removing iron and reducing fluoride、nitrate、carbonate、sulphate and so on. The water treatment process of Cu-Zn alloy filter material through the electrochemical reaction occurs on the surface of it, but the conventional Cu-Zn alloy filter material KDF55 is 0.5 3 mm particles of Cu-Zn alloy, water treatment was effective only its surfaces, inefficiency, and both of Cu and Zn are high price nonferrous metal, so, how to effectively improve the performance of Cu-Zn alloy filter material is a very meaningful task.This experiment with electroplating develops Cu-Zn alloy filter material. substantially increases the units volume of surface （specific surface area）, researches ionic solution strength Cu2+:Zn2+ （molar ratio）、total concentration （CuSO4·5H2O or ZuSO4·7H2O）、voltage、distance, all three influence to the element and deposition rate of foam-like Cu-Zn alloy filter material. so that it can get the best preparation condition for the foam-like Cu-Zn alloy filter material: CuSO4·5H2O = 50 g/L ,ZuSO4·7H2O = 47.83 g/L (Cu2+:Zn2+（molar ratio）= 1.2:1),C4H4O6KNa·4H2O/(Cu2++Zn2+)（molar ratio） = 1 （C4H4O6KNa·4H2O = 103.4 g/L ）, direct voltage = 12 V , d = 40 mm, pH = 13, NaOH = 32 g/L, temperature = 30℃.Use SEM for foam-like Cu-Zn alloy filter material characterization, the size of it reachs micron level, closes to nanometer level, the surface topography of it is loose racemes foam and high porosity. Use Micromeritics surface areas and porosity analyzer determine the specific surface area, the specific surface area of foam-like Cu-Zn alloy filter material is 6.68 m2/g , far higher than 1.02 m2/g of KDF55, the specific surface area of foam-like Cu-Zn alloy filter material is 6 times more than the specific surface area of KDF55. Use EDS for foam-like Cu-Zn alloy filter material characterization, when Cu2+:Zn2+（molar ratio）= 1.2:1, the quality ratio of Cu:Zn nearest to 1:1. Use XRD analyze the crystal structure of foam-like Cu-Zn alloy filter material, the results indicate that the foam-like Cu-Zn alloy filter material is multiphasic mixture.The density of foam-like Cu-Zn alloy filter material only 3 % to KDF55, 1 g foam-like Cu-Zn alloy filter material and 32 g KDF55, remain them in the same filter of diameter 27 mm, then them have the same bed height 19 mm.The test of foam-like Cu-Zn alloy filter material and KDF55 removing residual chlorine indicate that, 1 g foam-like Cu-Zn alloy filter material also higher than 32 g KDF55 for the residual chlorine removal rate, which get 4.0 % 29.3 %.The test of foam-like Cu-Zn alloy filter material and KDF55 removing heavy metal Cr6+ indicate that, 1 g foam-like Cu-Zn alloy filter material also higher than 32 g KDF55 for the heavy metal Cr6+ removal rate, which get 13.3 % 23.0 %.The test of foam-like Cu-Zn alloy filter material and KDF55 removing heavy metal Pb2+ indicate that, 1 g foam-like Cu-Zn alloy filter material also higher than 32 g KDF55 for the heavy metal Pb2+ removal rate, which get 2.4 % 15.1 %.Foam-like Cu-Zn alloy filter material has low density and the good advantage of residual chlorine and heavy metal removal, it can be deal with the same quantity of water but substantially reduce the usage of filter material, thus greatly reduced the cost of water treatment.

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