The present investigation showed that shale was a
promising adsorbent for the removal of reactive dyes from
aqueous solutions over a wide range of concentrations. The
adsorbed amounts of reactive dyes reached a maximum at
equilibrium within 72 hrs. Equilibrium data was best described
by the Langmuir isotherm, with the maximum monolayer
adsorption capacities of in range of 0.0110-0.0322 mg/g for
Red, 0.4479-1.1409 mg/g for Blue and 0.0133-0.0255 mg/g for
Yellow, respectively. The maximum adsorption capacities of
reactive dyes by shale occurred at an initial pH of 2, initial
concentration of 700 Pt-Co and temperature 45°C. Reactive
dye adsorption capacities increased with increasing of the
initial dye concentration and temperature whereas decreasing
of pH. For the fixed bed system, the average COD and
color removal efficiency were higher than 97% and 90%,
respectively, for all actual textile wastewater. The utilization of
shale adsorption with effluent from AS could be extended the
life span of fixed bed column longer than dyebath wastewater
and raw textile wastewater. The results of this study will
provide information on the utilization of shale as low-cost
adsorbent to remove COD and color from textile wastewater.
The present investigation showed that shale was apromising adsorbent for the removal of reactive dyes fromaqueous solutions over a wide range of concentrations. Theadsorbed amounts of reactive dyes reached a maximum atequilibrium within 72 hrs. Equilibrium data was best describedby the Langmuir isotherm, with the maximum monolayeradsorption capacities of in range of 0.0110-0.0322 mg/g forRed, 0.4479-1.1409 mg/g for Blue and 0.0133-0.0255 mg/g forYellow, respectively. The maximum adsorption capacities ofreactive dyes by shale occurred at an initial pH of 2, initialconcentration of 700 Pt-Co and temperature 45°C. Reactivedye adsorption capacities increased with increasing of theinitial dye concentration and temperature whereas decreasingof pH. For the fixed bed system, the average COD andcolor removal efficiency were higher than 97% and 90%,respectively, for all actual textile wastewater. The utilization ofshale adsorption with effluent from AS could be extended thelife span of fixed bed column longer than dyebath wastewaterand raw textile wastewater. The results of this study willprovide information on the utilization of shale as low-costadsorbent to remove COD and color from textile wastewater.
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