Removal of Ni (II) and Cu (II) ions from aqueous solution using rambutan fruit peels (Nephelium lappaceum L.) as adsorbent

Elimination of Cadmium (II) in aqueaous solution using corn cob (Zea mays) in batch system: adsorption kinetics and equilibrium

“…The peak of about 1400 cm −1 could be due to the presence of (C-H) aliphatic and aromatic groups in the plane of deformation (Ahmad et al, 2012;E. D. Asuquo & Martin, 2016;Rinaldi et al, 2018). It has been previously reported for corn residues that the presence of these absorbance peaks corresponds to esters, amines, hydroxyl, and alcoholic groups (Carreño-De León et al, 2017).…”

“…et al, 2016). Thus, bio-adsorption is presented as an effective, economic and environmentally friendly strategy for the removal of heavy metals in solution, due to the fact that materials of plant origin have the capacity to trap metals present in water by their ion exchange capacity, since their cell wall is composed mainly of cellulose, hemicellulose and lignin, which contain functional groups such as hydroxyl, carboxyl, amino, hydrocarbons, among others, which are directly related to the active sites of adsorption (García et al, 2013;Medellín-Castillo et al, 2017;Rinaldi et al, 2018). Various waste materials have been studied and have the potential to be used as bio-adsorbents in the adsorption of heavy metals with good yields; among these materials are banana peels (Anwar et al, 2010), melon (Manjuladevi et al, 2018), lentils (Basu et al, 2017), cocoa (Vera-Cabezas et al, 2018), orange (Chen et al, 2018;Romero-Cano et al, 2017;Tran et al, 2016), among other (Dai et al, 2018;Neris et al, 2019); This is due to the potential that residues of lignocellulosic origin have as heavy metal adsorbents due to the presence of functional groups that act as active exchange centres (Guedidi et al, 2017).…”

Adsorption in a binary system of Pb (II) and Ni (II) using lemon peels

“…The Freundlich model predicts the process of Ni (II) adsorption, so it can be said that during the adsorption process multilayers are formed on the surface of the biomaterials with a non-uniform distribution of heat and adsorption affinities on the heterogeneous surface. The active sites of absorption are occupied first by strong bonds, and this force decreases as they are occupied by the ions [54], [55]. The value of Freundlich's constant n (Table 4), is not in the range 1-10 which indicates that the chemical bonds formed between the ions and adsorbent are weak [54], [56], [57].…”

“…The active sites of absorption are occupied first by strong bonds, and this force decreases as they are occupied by the ions [54], [55]. The value of Freundlich's constant n (Table 4), is not in the range 1-10 which indicates that the chemical bonds formed between the ions and adsorbent are weak [54], [56], [57]. From equilibrium data to the Dubinin-Radushkevich model, a good fit was found for the Ni (II) and Pb (II) isotherm, with an R 2 higher than 0.98 in both cases and a qmax close to the experimental one.…”

Use of agro-industrial residues of plantain (Musa paradisiaca) in the adsorption of Ni (II)

“…Thus, bio-adsorption is presented as an economical and environmentally friendly alternative, which allows the recovery of waste as contaminant adsorbents due to the presence of active centres in its lignocellulosic structure [8]. Different biomasses have been used to remove heavy metals such as lychee [9], orange [10], Pisum sativum [11], yam [12], lime [13], cranberry seed peel, rosehip seed peel, and banana peel [14], rambutan peels [15], palm bagasse [16], sweet lime and lemon peel powder [17], which reported good yields and adsorption capacity.…”