Water Purification with Natural Sorbents: Effect of Surface Modification with Nano-structured Particles

Abstract

Modified nanostructured sorbents are widely used in water treatment processes. In this work, aluminum and iron particles prepared by electro-spark dispersion have been applied as modifiers. Zeolite samples from "Holinskoe" mineral deposit (Russia, Republic of Buryatia), with a size smaller than 0.1 mm, have been modified with aluminum and iron particles, using a sol-gel process. The properties of the modified materials have been determined by means of sorption test, when removing ions Pb{2+}, Fe{3+} and Cd{2+} from the model solutions in static conditions. Using the method of thermal desorption of nitrogen (BET) it has been shown that increasing the iron content in the samples of nanostructured modified sorbents does not affect the increase in specific surface area and pore volume of the samples. Ions concentrations have been analyzed by stripping voltammetry and photocolorimetry. As a result, modified sorbents revealed a high efficiency sorption of heavy metals

Efficiency of using the Kazakhstan zeolites for the purification of water from iron ions

“…Heavy metals are highly toxic substances and pose a danger to human health [7]. At the same time, macro-and microelements are indispensable factors of nutrition, which, on the one hand, makes it possible to normalize their content in the diet and food products, on the other hand, dictates the need for such rationing under the conditions of environmental pollution [8].…”

Removal of Lead and Cadmium Ions from Aqueous Solution by Adsorption on a Low-Cost Phragmites Biomass

“…Ions of heavy metals are toxic and bio-accumulative, with further biomagnification. Therefore, purification of water from heavy metals is an important issue for human beings [11]. Toxicity of cadmium and lead are well known [12].…”

Biomodification of Flax Fibrous Materials for Increase of Sorption to Organic Compounds

“…Synthetic sorbents have high sorption properties, but they are much costlier and as well require complex purification methods for reuse and special conditions of burial due their low ability to biodegrade naturally. Natural sorbents are widely used for removal of impurities from water such as the pesticides, dyes, surfactants, and many inorganic and toxic organic chemicals [1,2]. e main advantage of the natural sorbents is the low cost allowing in some causes to abandon the regeneration and simplify exploitation.…”