http://localhost:8080/xmlui/handle/123456789/2366 Tue, 23 Jun 2026 06:29:26 GMT 2026-06-23T06:29:26Z http://localhost:8080/xmlui/handle/123456789/3815 Title: Equilibrium and Kinetic Studies of Ni (II) Adsorption using Pineapple and Bamboo Stem Based Adsorbents Abstract: This work addresses the preparation and characterization of inexpensive adsorbents for the removal of Ni (II) from aqueous solutions. Activated carbon based adsorbents have been prepared from plant based biomass resources, namely Pineapple stem (Ananas Comosus) and Bamboo Stem (Bambuseae). Adopting phosphoric acid and heat treatment techniques, it has been observed that the bamboo stem activated charcoal (BSAC) and pineapple stem (PS) adsorbents had a BET surface area of 116 and 11.47m2/g, respectively. FTIR analysis indicated that various surface functional groups (such as C≡N stretching, stretching vibration of C=O, –CH3 wagging and C–O stretching vibration) contribute towards Ni (II) adsorption. Batch mode adsorption experiments were conducted for these adsorbents in the range of 50–300mg/L Ni (II) solution concentration, 2–10 pH, 15–300 min. contact time, and 0.02–0.1 g/50mL dosage. The BSAC adsorbent has been characterized with a metal uptake and %removal of 121.72 mg/g and 92.47, respectively, which corresponds to 45% higher metal uptake than corresponding bamboo based adsorbents presented in the literature. Further experimentation with BSAC enabled to achieve activated charcoal with surface area values similar to that of the commercial activated carbon adsorbent. The bamboo adsorbent has also been evaluated to perform similar to the commercial activated carbon for the removal and recovery of Pd (II) from synthetic electroless plating solutions. Also, a conceptual cost analysis indicated and affirmed towards the potential of the BSAC adsorbents for waste water treatment applications. Thu, 12 Sep 2013 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3815 2013-09-12T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2860 Title: Adsorption of 2-picoline from wastewater by agro coal ash: parametric, kinetic, equilibrium and thermodynamic features Authors: Daware, G. B.; Vijay Babu, P. V. Abstract: 2-Picoline is a derivative of pyridine. Due to the hazardous nature, the removal of 2-picoline from wastewater is important. In the present study, the ability of agro coal ash as an adsorbent for the removal of 2-picoline from wastewater in a broad range of concentration (50–300 mg/L) was investigated. The influence of various experimental parameters like initial pH, adsorbent dose, contact time, initial concentration and temperature on the removal of 2-picoline on agro coal ash were studied. The optimum conditions for the maximum removal of 2-picoline were found to be: initial pH 6, contact time = 7 h and adsorbent dose = 2 g/L. Adsorption of 2-picoline followed pseudo-second-order rate kinetics. The Langmuir and Freundlich adsorption equilibrium isotherm models were analysed. The values of the change in Gibb’s free energy (DG), enthalpy (DH) and entropy (DS) were calculated. Thermodynamic studies revealed that adsorption of 2-picoline on agro coal ash is an endothermic process. Thu, 30 May 2013 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2860 2013-05-30T00:00:00Z