Adsorption of cesium from aqueous solution using agricultural residue – Walnut shell: Equilibrium, kinetic and thermodynamic modeling studies

Abstract

15A novel biosorbent derived from agricultural residue -walnut shell (WS) is reported to remove cesium from aqueous 16 solution. Nickel hexacyanoferrate (NiHCF) was incorporated into this biosorbent, serving as a high selectivity trap 17 agent for cesium. Field emission scanning electron microscope (FE-SEM) and thermogravimetric and differential 18 thermal analysis (TG-DTA) were utilized for the evaluation of the developed biosorbent. Determination of kinetic 19 parameters for adsorption was carried out using pseudo first-order, pseudo second-order kinetic models and 20 intra-particle diffusion models. Adsorption equilibrium was examined using Langmuir, Freundlich and

Removal of Radioactive Cesium (134Cs plus 137Cs) from Low-Level Contaminated Water by Charcoal and Broiler Litter Biochar

“…Biochars are known to have the ability to adsorb organic and inorganic compounds, including heavy metals, and have been used for remediation of polluted soil (Beesley et al, 2011;Dias et al, 2007;Uchimiya et al, 2012). Adsorption of cesium by agricultural residues (coir pith and walnut shell), which were modified by incorporating nickel hexaxyanoferrate, was reported recently (Parab and Sudersanan, 2010;Ding et al, 2013), but to the best of our knowledge, cesium adsorption by biochar made of broiler litter has not been examined.…”

Hierarchically porous zeolite X composites for manganese ion-exchange and solidification: Equilibrium isotherms, kinetic and thermodynamic studies

“…The Gibbs free energy change is related to the enthalpy (∆Hº) and the entropy (∆Sº) at any temperature using The values of ∆Hº (kJ/mol) and ∆Sº (kJ/mol.K) were calculated by plotting of ln Kd against 1/T [30, [54][55][56][57]. Table 6 Since, more of Mn 2+ ions replace the zeolites cations leads to more randomness in the system.…”

Technique of Batch Adsorption for the Elimination of (Malachite Green) Dye from Industrial Waste Water by Exploitation Walnut Shells as Sorbent

“…From Freundlich isotherm, the worth of 1/n, the Freundlich limit, that was between 0-1 additionally confirmed that the sorption was favorable and useful as low price sorbent [24,[41][42][43].…”

“…There is variety of natural adsorbents such clay [17], granular kohlrabi peel [18], peel [19], rice husk [20], raw barley straw [21], peanut husk [22], crab shell [23], and walnut shell [24]. Walnut shells are considered agricultural wastes with sensible chemical stability, high mechanical strength, simple regeneration and huge specific area.…”