Specific Surfaces of Wood and Peat

The specific surface areas of various particle size ranges of wood and peat were determined. The methods employed are mercury porosimetry, nitrogen adsorption, and solution isotherms. The results indicate that dye solution isotherms offer an accurate means of surface area measurement, however, the values obtained are dependent on (a) the chemical nature of the solute and adsorbent and (b) the molecular dimensions of the solute. Nitrogen isotherms indicate specific surfaces of (21 multiplied by 10**3) minus (27 multiplied by 10**3) m**2kg** minus **1 for wood depending on the particle size, while an area of 26. 5 multiplied by 10**3 m**2kg** minus **1 was obtained for peat independent of particle size. Acid dye isotherms yield specific surfaces considerably lower than nitrogen isotherm values; for wood (7. 3 multiplied by 10**3) minus (9. 6 multiplied by 10**3) m**2kg** minus **1 and for peat, (5. 2 multiplied by 10**3) minus (11. 8 multiplied by 10**3) m**2kg** minus **1. Basic dye studies, using wood, indicate surface areas similar in magnitude to those obtained from nitrogen isotherms

The Removal of Acid Dye from Effluent Using Natural Adsorbents. I. Peat.

The adsorption of Telon Blue (Acid Blue 25) on peat has been investigated. Adsorption parameters for the Langmuir and Freundlich isotherms were determined and the effects of contact time, initial dye concentration and peat particle size were studied. A series of fixed bed experiments were performed and the results compared with existing design models for adsorption columns

The Removal of Acid Dye from Effluent Using Naturally Occurring Adsorbents. II. Wood

The ability of wood to adsorb Telon Blue (Acid Blue 25) has been investigated. The effects of contact time, particle size and adsorption capacity have been studied. In addition a series of fixed bed experiments were performed to study the flow system in an attempt to simulate industrial conditions

The Sorption of Dyes onto Peat in Fixed Beds

A design method for fixed bed adsorption columns has been presented and tested. The model is based on external mass transfer and pore diffusion. An optimisation technique using the empty bed contact time is illustrated. The models are tested using peat as adsorbent medium