Efficient pollutants removal by amino-modified nanocellulose impregnated with iron oxide

Abstract

A novel adsorbent, NC-PEG, obtained by modification of nanocellulose (NC) with PEG-6-arm amino polyethylene glycol (PEG-NH 2) via maleic anhydride (MA) linker, was used for removal of Cd 2+ and Ni 2+ from water. A subsequent precipitation of iron oxide (FO) from goethite on NC-PEG was employed to produce NC-PEG/FO adsorbent which was used for As(V) and As(III) removal. In a batch test, the influence of pH, contact time, initial ion concentration and temperature on the adsorption efficiency were studied. The maximum adsorption capacities found for Cd 2+ and Ni 2+ , obtained by the use of Langmuir model, were 37.9 and 32.4 mg g-1 at 25 °C, respectively. Also, high As(V) and As(III) removal capacities of 26.0 and 23.6 mg g-1 were obtained. The thermodynamic parameters indicated endothermic, feasible and spontaneous nature of the adsorption process. The kinetic study, i.e., fitting by Weber-Morris model predicted that intra-particle diffusion was the ratecontrolling step. The ability for multi-cycle reusability of both NC-PEG and NC-PEG/FO, represents a positive indicator when considering their possible applications.

Immobilization of Horseradish Peroxidase on Multi-Armed Magnetic Graphene Oxide Composite

“…The 6arm-PEG-NH 2 is a polyethylene glycol derivative which is used to modify the protein polypeptide. Since it is rich in amino groups, it can form an immobilized enzyme through the crosslinking agent glutaraldehyde binding with protein and increase the stability and loading amount of enzyme ( 16 ), but it can also react with the carboxyl group of materials (such as polyacrylic acid) to form stable amide bond, which improves the solubility and stability of the material. Herein, a new magnetic multi-armed nanocomposite (GO@Fe 3 O 4 @6arm-PEG-NH 2 ) was designed.…”

Nanocellulose: Recent advances and its prospects in environmental remediation

“…In addition, bleached birch fibres from Betula verrucosa and B. pendula were also investigated in a study led by Suopajärvi et al [ 54 ] to fabricate dicarboxylic acid nanocellulose flocculant and examine its effectiveness in the treatment of municipal wastewater (removal of turbidity and chemical oxygen demand (COD)). In another study, cotton microfibers were subjected to acid treatment, washing, and filtration to produce nanocellulose adsorbents for the removal of cadmium and nickel ion from water [ 55 ]. In view of these recent developments, there is much that plant-based nanocellulose can offer to green chemistry and biomaterial sciences for environmental remediation.…”

Controllable synthesis of Fe3O4-wollastonite adsorbents for efficient heavy metal ions/oxyanions removal

“…Many theoretic studies (isothermal, kinetic, statistical-physic models) are carried out to understand the behavior of single-compound adsorption systems since the operating conditions can be potentially infinite in terms of combination of pollutant concentration, temperature, and time of the pollutant/adsorbent contact (Sellaoui et al 2016a(Sellaoui et al , b, 2017a. Freundlich and Langmuir models are mostly used to analyze the adsorption equilibrium of heavy metal removal using WL-or MG-based adsorbents in a single component system (Sharma et al 1990a(Sharma et al , b, 2007Taleb et al 2016b;Obradović et al 2017a, b). More precise interpretation of single adsorption isotherm can be obtained using statistical physic theory, etc., monolayer models with one or two energies.…”