论文信息 - Copper Removal from Water by Chemical Reduction with Sodium Borohydride

Copper Removal from Water by Chemical Reduction with Sodium Borohydride

Abstract The use of NaBH4 as a chemical reductant to precipitate copper from water has been studied. Initial Cu2+ concentrations of 25 and 40 mg/L have been checked, and complete removal can be achieved. When solid NaBH4 is fed, BH4 − to Cu2+ molar ratios higher than 2 were needed. This can be substantially improved by using NaBH4 as a stabilized alkaline solution. A kinetic model is proposed which gives information about the relative rates of the two competitive reactions involved (Cu2+ and water reduction with BH4 0) and allows the operating conditions leading to minimum BH4 − consumption to be established.

J. M. Rodríguez-Maroto | F. Garcia-Herruzo | C. Gómez-Lahoz | J. J. Rodriguez

[1] J. Brock,et al. Growth of ferromagnetic particles from cation reduction by borohydride ions , 1987 .

[2] E. H. Jensen,et al. Simple Volumetric Assay for Sodium Borohydride , 1952 .

[3] W. Ying,et al. Precipitation treatment of spent electroless nickel plating baths , 1988 .

[4] B. Ganem,et al. Studies on the mechanism of transition-metal-assisted sodium borohydride and lithium aluminum hydride reductions , 1986 .

[5] M. M. Kreevoy,et al. H$sub 2$BH$sub 3$ AS AN INTERMEDIATE IN TETRAHYDRIDOBORATE HYDROLYSIS. , 1972 .

[6] M. M. Kreevoy,et al. Solvent isotope effects on tetrahydridoborate hydrolysis , 1972 .

[7] H. Brown,et al. Sodium Borohydride, Its Hydrolysis and its Use as a Reducing Agent and in the Generation of Hydrogen1 , 1953 .