Sorption of Pb2+ from Aqueous Solution unto Modified Rice Husk: Isotherms Studies

Abstract

Investigation of the sorption potential of rice husk, an agricultural waste, as an adsorbent was carried out. The rice husk was modified with orthophosphoric acid and was used for adsorption of lead (II) ions (Pb 2+ ) from aqueous solution. Physicochemical properties of the modified rice husk were determined. Equilibrium sorption data were confirmed with Langmuir, Freundlich and Temkin adsorption isotherms. On the basis of adsorption isotherm graphs, R 2 values were determined to be 0.995, 0.916, and 0.797 for Langmuir, Temkin, and Freundlich isotherms, respectively, indicating that the data fitted well into the adsorption isotherms, but Langmuir isotherm is a better model. The maximum monolayer coverage from Langmuir studies, max = 138.89 mg/g, Langmuir isotherm constant, = 0.699 L/mg, and the separation factor, = 1.41 × 10 −2 at 100 mg/L of lead(II) ions indicating that the sorption process, was favourable. The suitability of modified rice husk as an adsorbent for the removal of lead ions from aqueous solution and its potential for pollution control is established.

Marula seed husk (Sclerocarya birrea) biomass as a low cost biosorbent for removal of Pb(II) and Cu(II) from aqueous solution

“…The powdered material was kept in air tight containers and used when required. The composition of marula husk biosorbent was determined using previously reported procedures [25] and is shown in Table 1. FTIR spectroscopy (Thermo Scientific Nicolet 6700, USA) in the frequency range of 500-4000 cm À1 was used to identify the functional groups on marula seed husk biomass powder and then dispersing in KBr pellets before recording the spectra.…”

Application of response surface methodology for Cd(II) adsorption on maize tassel-magnetite nanohybrid adsorbent

“…The ZPC, moisture content, particle size, total ash content, bulk density, iodine number, BET surface area and total pore volume of the MT-MN were determined using procedures reported elsewhere [29,30]. The zero point charge (ZPC) and surface functional groups of the adsorbent were determined by powder addition method and Boehm titration, respectively [19].…”

“…The total ash content was 3.12%, showing that the adsorbent had a good quality and could have good adsorption capacity [29,30]. The bulk density affects the rate of adsorption of metal ions onto MT-MN.…”

Modified/Unmodified Nanoparticle Adsorbents of Cellulose Origin With High Adsorptive Potential for Removal of Pb(II) From Aqueous Solution

“…The presence of hydroxyl (-OH), phosphonic (-OPO3H 2-and -OPO3 3-), sulphonate (-SO3 2-, and carbonyl (CO) groups is believed to be the metal binding sites on the cellulose nanomaterials (Shatkin & Wegner, 2014;Mudasir et al 2015). Phosphoric acid modified agricultural wastes have been reported to posse high affinity for the removal of heavy metal ions in aqueous solution as reported by (Dada et al 2013). The presence of these groups on the synthesized Azeh2 and Azeh10 nanomaterials was revealed by FT-IR results of analysis of the samples.…”