New promising composite materials useful in the adsorption of Cu(II) in ethanol based on cellulose and cellulose acetate

Abstract

This work describes for the first time the synthesis and characterization of new promising materials based on cellulose (Cel) and cellulose acetate (Celac), previously modified with aluminum oxide (CelAl and CelacAl) and post functionalized with 1,4-diazabicyclo [2.2.2] octane-n-propyltrimethoxysilane chloride (SiDbCl 2 ), resulting the chemically modified hybrid materials CelAl/SiDbCl 2 and CelacAl/SiDbCl 2 . The materials have shown to be useful in the adsorption of CuCl 2 from ethanol, presenting high effective adsorption capacity. In the adsorption process, the copper ions diffuse into the solid solution interface and are retained as anionic complexes CuCl 3 -or CuCl 4 2-. An expressive effective adsorption capacity t Q , as well as the stability constants b 1 and b 2 , were found for both adsorbents: (a) CelAl/DbCl 2 : t Q = 0.33 9 10 -3 mol g -1 , log b 1 = 4.23 (±0.04) and log b 2 = 6.99 (±0.03);(b) CelacAl/DbCl 2 : t Q = 0.48 9 10 -3 mol g -1 , log b 1 = 5.1 (±0.1) and log b 2 = 8.3 (±0.1). Both adsorbent materials are potentially useful in the pre-concentration and further analysis of Cu(II) present in trace amounts in ethanol, extensively used as an automotive fuel in Brazil. Regeneration of the adsorbents requires a very simple procedure consisting in their immersion in aqueous solution which causes the immediate release of the Cu(OH 2 ) n 2? species to the solution phase.

Phosphated Cellulose as an Efficient Biomaterial for Aqueous Drug Ranitidine Removal

“…Natural polysaccharides such as cellulose and chitosan have been used in various fields to create new materials due to their advantageous properties mainly the nontoxicity, biocompatibility, and biodegradability [ 10 , 11 ]. Cellulose, when conveniently modified through a series of reactions, has been widely used as a substrate for appropriate reagent immobilizations, which has numerous applications such as ion sorption, supports for microorganism immobilizations, removal of organic pollutants, sorption of surfactant molecules, and several other applications [ 12 ]. In this context, when cellulose has been chemically modified by incorporating various active groups, the new biopolymers have been widely explored because these centers, among other properties, increased the sorption capacity of the pulp, providing good sorption to proteins and metals [ 10 , 13 , 14 ].…”

Preparation and characterization of a composite based on polyaniline, polypyrrole and cigarette filters: adsorption studies and kinetics of phenylbutazone in aqueous media

“…Thus, it is desirable monitoring and to develop analytical methodologies to detect and control the presence of this pharmaceutical in very different kinds of samples, from urine, serum or plasma and waste water, in which most of them having very complex matrices. [34][35][36][37][38] Cigarette filters (CFs) are alternative materials from cellulose acetate with great potential for adsorption and preconcentration of different analytes of several matrices, wildly used in separation area. 12 Conducting polymers and their composites have been extensively studied due to their interesting chemical and physical properties, in addition to their wide range of potential application, such assensors, 13 thermoelectric, 14 electrodes, 15 supercapacitors 16 etc.…”

Functionalized Polymers from Lignocellulosic Biomass: State of the Art

“…Given the dynamic development and implementation of nanomaterials, CA has been successfully employed as a precursor for matrices, nanoparticles and nanofibers. In the year 2012 alone, CA was used to prepare membranes for nanofiltration [31][32][33][34][35][36][37][38][39][40][41][42], organoclay nanocomposites [43][44][45], antimicrobial wound dressing [46], bone regeneration material [47], biosensors [48], bioreactors [49], polymer electrolyte [50,51], energetic materials (composite explosives and propellants) [52], insulating [53] and fireproofing materials [54], and novel drug delivery systems [49,55].…”