Optimization of Cd(II), Cu(II) and Ni(II) biosorption by chemically modified Moringa oleifera leaves powder

Preparation and Characterization of Poly(ethyl hydrazide) Grafted Oil Palm Empty Fruit Bunch for Removal of Ni(II) Ion in Aqueous Environment

“…According to Reddy et al, the values of n in the range of 2-10 represent good, 1-2 moderately difficult and <1 is poor adsorption [29]. Therefore, based on the data calculated, values of n for nickel (II) adsorption onto peh-g-opefb at all temperatures studied were in the range of 2-10 indicating a favorable adsorption process and this is in agreement with the R L values.…”

Predicting the capability of carboxylated cellulose nanowhiskers for the remediation of copper from water using response surface methodology (RSM) and artificial neural network (ANN) models

“…The optimum pH range (4-6) for the adsorption process published in the literature were considered too acidic since a pH below 6 will increase the competition between protons and metal ions for active sites (Reddy, 2012). Moreover, to prevent the formation of metal hydroxide precipitation at pH higher than 6, it was decided that the optimum pH for the removal of Cu(II) ions using modified CNWs was at pH 6.…”

“…Carboxylic acid groups are one example of a functional group that can be introduced onto the cellulose surface by (TEMPO)-mediated oxidation and this oxidized cellulose adsorbent has been shown to be capable of adsorbing 465.1 mg/g Pb(II) from aqueous solution (Yu et al, 2013). However, only limited work has been published on using cellulose nanowhiskers (CNWs) as an adsorbent, as the majority of the literature has mainly focused on macroscopic lignocellulosic biomass such as jute, orange peel, wood sawdust, wood pulp and sugarcane bagasse fibres, rather than pure cellulose (Reddy, 2012). Although most of the adsorbents mentioned above are considered good adsorbents, CNWs offer higher adsorption capacity and performance due to high specific surface areas and a high reactive group density on the surface (Eyley and Thielemans, 2014).…”

Application of beech sawdust for removal of heavy metals from water: biosorption and desorption studies

“…That is why searches for still new, more effective methods, cheaper materials for sorbents production, i.e., of biological origin (Witek-Krowiak and Reddy 2013), commonly occurring or from industrial wastes, are undertaken. Many various waste materials are tested, such as: fragmented coconut shells (Amuda et al 2007), fruit rinds (Schiewer and Patil 2008), lignocellulosic materials (Reddy et al 2012) or animal waste (An et al 2001). Extremely low prices of those sorbents and possibility of their regeneration make the biosorption process economically profitable and highly competitive to other methods of metals removal from water.…”