Removal and recovery of cobalt from aqueous solutions by adsorption using low cost lignocellulosic biomass—coir pith

Abstract

The applicability of low-cost lignocellulosic biosorbent-coir pith, for removal of cobalt (II) from aqueous solutions using batch adsorption studies has been explored herein. Adsorption characteristics of coir pith were investigated systematically by varying the experimental parameters such as, solution pH, initial metal ion concentration, contact time, adsorbent dose and temperature. The studies revealed that optimum adsorption of cobalt onto coir pith occurred in the pH range of 4.0 - 7.0. Sorption kinetics of cobalt was found to be quite rapid under ambient conditions and the process followed second-order kinetics. The experimental data have been analyzed using non-linearized forms of Langmuir, Freundlich and Redlich-Peterson adsorption isotherms for mathematical description of the process. Desorption studies showed that the quantitative recovery of Co (II) from the spent coir pith was achieved by using 0.5 N HCl. The suitability of this adsorbent for real situation has been observed, when complete removal of cobalt from nuclear power plant coolant water was obtained. The present studies successfully demonstrated the use of coir pith as an efficient adsorbent material for removal of cobalt from aqueous solutions.

Application of dolochar in the removal of cadmium and hexavalent chromium ions from aqueous solutions

“…13 and 14 for the two metal ions respectively at three different temperatures. The adsorption data for both the metal are found to fit well to pseudo 2nd order kinetics as the regression coefficients, R 2 , for both Cd(II) and Cr(VI) plot were nearly equal to one [32]. The theoretical and as well as experimental q e value is nearly equal and with increase in temperature resulted in increase of q e which is a chemisorptions nature of adsorption [33,34].…”

Esterified Coconut Coir by Fatty Acid Chloride as Biosorbent in Oil Spill Removal

“…They can be used to recover the oil through the mechanisms of absorption, adsorption or both. The other benefit of using a sorbent is its ease of handling, fast oil uptake, and the capability to capture and retain oil for retrieval at a later time (Parab et al 2010).…”

Fibras de Cocos nucifera como sorvente de petróleo em ambiente marinho

“…O material sorvente também deve ter facilidade de manuseio, rápida capacidade de reter petróleo para sua recuperação em um momento posterior (Parab et al, 2010;Yusof et al, 2015).…”