http://dns2.asia.edu.tw/~ysho/YSHO-English/1000%20WC/PDF/Pro%20Bio34,%20451.pdf

Pseudo-second order model for sorption processes

Remediation of dyes in textile effluent: a critical review on current treatment technologies with a proposed alternative

Non-conventional low-cost adsorbents for dye removal: A review

http://dns2.asia.edu.tw/~ysho/YSHO-English/Publications/PDF/Che%20Eng%20J70,%20115.pdf

Sorption of dye from aqueous solution by peat

Arsenic removal from water/wastewater using adsorbents—A critical review

Copper(II) removal from aqueous solutions by fly ash

Removal of chrome dye from aqueous solutions by mixed adsorbents fly ash and coal

The removal of Pb(II) from aqueous solution by adsorption on china clay and wollastonite is an attractive process. The amount of Pb(II) removed by adsorption is highly dependent on the temperature of the adsorbate solution and favours low temperature. The equilibrium times were noted, i.e. 90 min for china clay and 120 min for wollastonite. The various rate parameters of the adsorption process have been determined at different temperatures. The activation energies were determined and found to be −5.345 kJ mol−1 and −8.730 kJ mol−1 for Pb(II)-china clay and Pb(II)-wollastonite systems, respectively. The adsorption isotherm was measured experimentally at various temperatures. The negative values of enthalpy change (ΔH = −77.95 kJ mol−1 and −16.40 kJ mol−1 for china clay and wollastonite, respectively) indicate the exothermic nature of the adsorption processes for both systems. The isosteric heats of the adsorption process have been determined at various surface coverages of the adsorbents used. The various thermodynamic parameters have been calculated to elucidate the mechanism involved in the adsorption process.

Effect of temperature on the removal of lead(II) by adsorption on China clay and wollastonite

The removal of As(III) from aqueous solutions at different concentrations, pH and temperatures by haematite has been carried out successfully. The maximum removal was found to be 96 % at concentration 13.34 μmol L−1, temperature 20 °C and pH 7.0. The process of uptake follows first-order adsorption rate expression and obeys the Langmuir's model of adsorption. The removal of As(III) by haematite is also partially diffusion controlled and mass transfer coefficients, diffusion coefficients and thermodynamic parameters have been determined to explain the results.

As(III) removal from aqueous solution by adsorption

The ability of a homogeneous mixture of fly ash and wollastonite (1:1) to remove Cr(V1) from aqueous solutions by adsorption has been investigated. The extent of removal is dependent on concentration, pH and temperature of the solution. The applicability of the Langmuir isotherm for the present system has been tested and the surface mass transfer coefficient at 30°C and pH 2.0 determined. Maximum removal was observed at pH 2.0 and 30°C. The adsorption is first governed by diffusion followed by surface compound formation. The thermodynamic parameters, desorption results and infrared studies indicated that the surface compounds, formed by interaction of adsorbate ions and different constituents of mixed adsorbent, were stable in nature.

V. N. Singh

Papers

Copper(II) removal from aqueous solutions by fly ash

Removal of chrome dye from aqueous solutions by mixed adsorbents fly ash and coal

Effect of temperature on the removal of lead(II) by adsorption on China clay and wollastonite

As(III) removal from aqueous solution by adsorption

Removal of Cr(V1) from aqueous solutions by adsorption on fly ash-wollastonite