Nanoporous networks as effective stabilisation matrices for nanoscale zero-valent iron and groundwater pollutant removal

Abstract

Nanoporous networks exhibit effective stabilisation properties for nanoscale zero-valent iron (nZVI) and nZVI, with its reductive potentials and wide availability, offers degradative remediation of environmental contaminants.

Termination of nanoscale zero-valent iron reactivity by addition of bromate as a reducing reactivity competitor

“…At first, physical separation of nZVI from reaction medium can be considered. As described in our previous research on the development of a colorimetric assay for nZVI reactivity (Hwang et al 2016) and work using nZVI impregnated into porous polymer matrices for groundwater remediation (Mines et al 2016), termination of nZVI reactivity has been performed by using membrane filtration to separate out nZVI from the bulk reaction solution. However, filtration cannot be used for volatile compounds, since they can be volatilized during the filtration step.…”

Estimating dehalogenation reactivity of nanoscale zero-valent iron by simple colorimetric assay by way of 4-chlorophenol reduction

“…In order to obtain the desired properties for the particular application, a number of synthesis and modification methods have been reported in past decades. For in-situ applications where colloidal stability in the subsurface is necessary, surface modification of nZVI has been applied by using various surface stabilizing agents, such as surfactants, polymers, and organic clays [12][13][14][15]. While for ex-situ applications where particle immobilization is mandatory, attachment of nZVI on to supporting media has been extensively studied using various materials, such as alginate beads, activated carbon, and polymeric membranes [16][17][18][19].…”

Azo-dye adsorption activity of iron(III) loaded novolac-based network sorbents

“…Various physico-chemical methods including coagulation and flocculation, oxidation or ozonization, membrane-filtration processes, ion exchange, chemical precipitation, and adsorption focused on the removal of azo dyes from wastewater. [6][7][8][9][10][11][12][13][14][15][16][17] Among these methodologies, adsorption-based process [6][7][8] has received increasing interest because of its economics, design simplicity and efficiency in minimizing pollutants. Polymeric sorbents [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] enjoy exclusive attributes namely low density, high thermal and/or chemical stability, mechanical rigidity, wide variations in porosity and surface functionality tailoring, high adsorption capability, easy handling and feasible regeneration.…”