Oxidized Renewable Materials for the Removal of Cobalt(II) and Copper(II) from Aqueous Solution Using in Batch and Fixed-Bed Column Adsorption

Abstract

Batch and continuous adsorption of Co2+ and Cu2+ from aqueous solutions by oxidized sugarcane bagasse (SBox) and oxidized cellulose (Cox) were investigated. The oxidation reaction of sugarcane bagasse and cellulose was made with a mixture of H3PO4‒NaNO2 to obtain SBox and Cox, with the introduction of high number of carboxylic acid functions, 4.5 and 4.8 mmol/g, respectively. The adsorption kinetics of Co2+ and Cu2+ on SBox and Cox were modeled using two models (pseudo-first-order and pseudo-second-order) and the rate-limiting step controlling the adsorption was evaluated by Boyd and intraparticle diffusion models. The Sips and Langmuir models better fitted the isotherms with values of maximum adsorption capacity Qmax of 0.68 and 0.37 mmol/g for Co2+ and 1.20 and 0.57 mmol/g for Cu2+ adsorption on Cox and SBox, respectively. The reuse of both spent adsorbents was evaluated. Adsorption of Cu2+ and Co2+ on SBox in continuous was evaluated using a 22 factorial design with spatial time and initial metal concentration as independent variables and Qmax and effective use of the bed as responses. The breakthrough curves were very well described by the Bohart–Adams original model and the Qmax values for Co2+ and Cu2+ were 0.22 and 0.55 mmol/g. SBox confirmed to be a promising biomaterial for application on a large scale.

Application of Innovative Analytical Modeling for the Physicochemical Analysis of Adsorption Isotherms of Silver Nitrate on Helicenes: Phenomenological Study of the Complexation Process

“…Langmuir assumed that an adsorbent site can integrate only one particle; however, our statistical physics models proposed that one receptor site can suit n particles where n is a variable number. In addition, our statistical physics models suggested the presence of various adsorption energies that are related to various receptor sites, contrary to the empirical models (Langmuir and Freundlich) [38,39] which accept the presence of one adsorption energy level for all adsorbent sites.…”

Activated bamboo charcoal and açaí waste to remove contaminants – a review

“…The functional groups on the surface of activated carbon are influenced by the preparation method, whose acidic properties are caused by the existence of carboxyls, lactones and phenols, making the adsorbent more hydrophilic and decreasing the power of hydrogen, which concludes that the functional groups are related to the reactivity and adsorption properties of carbon (RODRIGUES et al, 2020). Thus, activated carbon with an acidic interface favors the removal of anionic compounds and, when faced with a basic profile, the adsorption of cation occurs.…”

Promoting the stability and adsorptive capacity of Fe3O4-embedded expanded graphite with an aminopropyltriethoxysilane–polydopamine coating for the removal of copper(ii) from water

“…Therefore, a monolayer adsorption occurred on the heterogeneous surface of EG + KH550 towards Cu(II), and the adsorption mechanism was predominantly chemical adsorption. 57,58 Surprisingly, as shown in Table 3, the Q max of the GFA + KH550 was higher than those of multi-walled carbon nanotubedecorated Fe 3 O 4 (Fe 3 O 4 /MWCNTs-COOH; 10.45 mg g À1 ), sodium dodecyl sulfate-coated Fe 3 O 4 nanoparticles (SDS-Fe 3 O 4 NPs; 24.2 mg g À1 ), oxidized sugarcane bagasse (SBox; 36.5 mg g À1 ), and oxidized cellulose (Cox; 76.8 mg g À1 ), [59][60][61] and it was also higher than those (18.3-25.6 mg g À1 ) of several GO/Fe 3 O 4 composites for the adsorption of Cu(II). 62 This was likely because there were more available adsorption sites on the GFA + KH550 than on the other materials.…”