Abstract
Abstract Adsorbents like water hyacinth leaf, powdered activated carbon (PAC), PAC in combination with polymer beads (added to enhance the porosity) and a combination of PAC with water hyacinth leaves were used to remove hexavalent chromium from wastewater. Equilibrium was achieved after approximately 18 h. The maximum equilibrium sorption capacity (q max), determined from Langmuir isotherm, are: ADRB1: 9.638 mg/g; ADRB2: 31.46 mg/g; ADRB3: 55.926 mg/g; ADRB4: 33.575 mg/g for 1l wastewater solutions. The adsorption capacity of PAC (ADRB3) has been found more than the composite ADRB4 with a combination of WH (2 g) and PAC (1 g). However, ADRB4 could be used for applications where large quantity of wastewater (e.g. leather complexes) containing hexavalent chromium is disposed into a huge water body where plenty of water hyacinths are grown naturally. Simultaneously three isotherms namely Tempkin, Freundlich and Langmuir were parameterized. The parameters were estimated using the Levenburg and Marquardt opti...
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