Mechanism of Pb2+ removal from aqueous solution using a nonliving moss biomass

Abstract

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. a b s t r a c tBiosorption of lead (II) ions onto raw biomass of the moss plant Barbula lambarenensis has been studied using the batch equilibrium adsorption method. Equilibrium isotherms, kinetics and thermodynamic parameters have been evaluated. The FT-IR analysis showed that likely functional groups responsible for the adsorption are carboxyl, carbonyl, amides and hydroxyl groups. The pH for optimum adsorption is 5.0. Equilibrium data fit well to the Langmuir isotherm. The estimated maximum adsorption capacity was found to be 62.50 mg/g at 298 K and 90.91 mg/g at 323 K. The kinetic data obeyed the pseudo-second-order model. The free energy changes (DG o ) are positive and the reaction is exothermic with decreased randomness at the sorbent/solution interface. Taking into account its good adsorption capacity, ease of sample treatment, as well as availability, the biomass of B. lambarenensis is a promising cost-effective biosorbent for Pb 2+ removal from aqueous environment.

Microscale scavenging of pentachlorophenol in water using amine and tripolyphosphate-grafted SBA-15 silica: Batch and modeling studies

“…This is an indication that the sorption of PCP by these SBA-15 sorbents involves chemisorption occurring by sharing or exchange of electrons between the SBA-15 materials and the anionic PCP species in solution (Olu-Owolabi et al, 2012). The Elovich and intra-particle diffusion kinetics models gave further insight into PCP sorption mechanism.…”

“…Two adsorption models e Langmuir (1916) and Freundlich (1906), in their linear forms were employed in describing the adsorption process. The Lagergren (1898) pseudo-first order and pseudo-second order models, the Elovich (Olu-Owolabi et al, 2014), and the Weber and Morris (1963) intraeparticle diffusion (IPD) models were used to describe the adsorption data (Supporting material).…”

“…Another important method for describing a sorbent is through evaluation of the adsorption isotherm (Olu-Owolabi et al, 2014). Fig.…”

“…The conventional treatment methods for wastewater include reverse osmosis, electrochemical treatment, solvent extraction, and adsorption on activated carbon, biological treatment (Olu-Owolabi et al, 2012). Several techno-economic considerations, such as efficiency and cost, plague these techniques.…”

Effects of time, soil organic matter, and iron oxides on the relative retention and redistribution of lead, cadmium, and copper on soils

“…The fate of these metals in soils is dependent on their specific sorption reactions with soil constituents (Arias et al 2002;Pérez-Novo et al 2008;Agbenin 2010) which determine their bioavailability and the severity of the harm they cause in the environment (Olu-Owolabi et al 2012). OM and IOs in soils are major natural sinks for metals.…”