Economic Treatment of Cadmium(II)-Rich Hazardous Waste by Indigenous Material
✍ Scribed by Y.C. Sharma
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 223 KB
- Volume
- 173
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
Cadmium removal by sorption onto Kemolit M3 (Wollastonite) was investigated. Metal species surface loading and (\mathrm{pH}) are the important factors controlling metal removal. Generally the (\mathrm{Cd}^{2+}) state is important in adsorption apart from (\mathrm{Cd}(\mathrm{OH})^{+}) in the higher pH range. Lower surface loading produces higher metal removal and the alkaline range is favorable for the uptake of (\mathrm{Cd}) (II). Maximum removal ((98.2 %)) has been noted at (\mathrm{pH}) 9.5 , which has been attributed to the additive effects of electrostatic forces aud surface complexation. The data fit the L angmuir isotherm well, indicating monolayer coverage. The intraparticle diffusion has been found to play a dominating role as compared to film diffusion. Mass transfer parameters have also been investigated. The role of (\mathrm{pH}), a master parameter governing the uptake of (\mathrm{Cd}) (II) has been discussed in light of the surface complexation at the solid-liquid interface. 1995 Academic Press, Inc.