Heavy metals adsorption by novel EDTA-modified chitosan–silica hybrid materials

EDTA functionalized magnetic nanoparticle sorbents for cadmium and lead contaminated water treatment

“…Due to its strong metal chelating ability and low cost, EDTA has been used to functionalize a variety of materials from inorganic oxides to biomass, including silica gel (Repo et al, 2009), chitosan (Repo et al, 2010), polyamine composites (Hughes and Rosenherg, 2007), polystyrene (Wang et al, 2010), mercerized cellulose and sugarcane bagasse (Jú nior et al, 2009), wood sawdust and sugarcane bagasse (Pereira et al, 2010), rice husk (Xiong et al, 2010), and baker's yeast biomass (Yu et al, 2008). However, a comparison of results shows that the adsorption efficiency was significantly influenced by the type of supporting material (Repo et al, 2011), and post-treatment separation needs to be taken into consideration.…”

The Adsorption Kinetic Parameters of Co2+ Ions by α-C2SH

“…Adsorption experiments were carried out at 25 • C in the thermostatic adsorber Grant Sub14 by stirring 5 g of synthetic α-C 2 SH in 500 mL of Co(NO 3 [16,31] work, the adsorption mechanism of Co 2+ ions by synthetic adsorbents can be determined by pseudo-first-order and pseudo-second-order equations. The pseudo-first-order can be represented by the following equation [31]:…”

“…Heavy metal pollution in wastewater is one of the most serious environmental problems because most of it is toxic, even at very low concentrations [1][2][3][4]. This pollution appears in many industries, such as metal plating, mining operations, chlor-alkali, radiator manufacturing, and alloy industries [2,5,6].…”

“…The common adsorbents primarily include activated carbon, zeolites, bio macromolecules, and calcium silicate hydrates [12][13][14][15]. However, some adsorbents show low adsorption capacities and short operation time [3,12]. In addition, when these adsorbents reach their adsorption capacity limit, they are usually stored to a landfill and discarded, which eventually causes secondary pollution due to the risk of leaching and the subsequent release of non-biodegradable heavy metals [16].…”

Optical Sensor for the Determination of Lead(II) Based On Immobilization of Dithizone onto Chitosan-Silica Membrane

“…The membrane that was made of a mixture of chitosan-silica can be an alternative in the fabrication of optical sensors. The fragile and low biocompatibility characteristics of silica can be solved by mixing the silica with chitosan [8]. In addition, silica is also able to increase the stability of membranes and pores of chitosan membrane [9].…”