Synthesis, Characterization and Application of Nano-adsorbent Materials in the Sorption of Pb(II), Ni(II), Co(II), Mn(II), Li(I) from Aqueous Solution

Hamdi Mohamed Hassan Gad,M I Aly,Sh Labib

doi:10.24297/jac.v10i8.2256

Hamdi Mohamed Hassan Gad, M I Aly + Show 1 more

Open Access

https://doi.org/10.24297/jac.v10i8.2256

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Abstract

In this study, nano-adsorbent materials were synthesized from two different precursors by thermal activation technique. The first was the synthesizing of nano-zinc silicate from chemical reagents of zinc oxide and commercial silica gel. The second was the preparation of nano-pore size activated carbon from different biomass. The synthesized nano-adsorbent materials were characterized by different techniques; Surface Area, FTIR, XRD and SEM. The prepared nano-adsorbent materials were applied in the sorption and separation of some heavy metals from aqueous solution. These metals includes; Pb (II), Ni(II), Co(II), Mn(II) and Li(I). Some factors affecting on the sorption process (e.g. contact time and pH) were investigated. It was found that: the nano-zinc silicate (of ratio 1:1 thermally treated at 700 0C) and nano-pores activated carbon (prepared from saw dust impregnated with 70% H3PO4 overnight, then heated to 500 0C in presence of steam for 80 min.) were the best samples for sorption and separation of concerned heavy metals.

Highlights

Different contaminants are released to water with the rapid industrialization of human society, including heavy metal ions, organics, bacteria, viruses, and so on, which are serious harmful to human health
The chemical activation was preferred over physical activation due to the fact that it was commonly used for biomass precursor for achieving higher yields and larger surface areas [21]
(2) The total capacity of the prepared activated carbon did not depend on the surface area but depends on the type of the precursor and the sample prepared from rice husk only was found to have the highest adsorption capacity and this may be due to the high content of silanol groups in this sample giving the chance of exchange of metal ions with hydrogen ions of these groups

Summary

Introduction

Different contaminants are released to water with the rapid industrialization of human society, including heavy metal ions, organics, bacteria, viruses, and so on, which are serious harmful to human health. A number of techniques have been developed for treating water and wastewaters embedded with heavy metals It includes chemical precipitation, reverse osmosis, membrane filtration, solvent extraction, ion exchange and adsorption [4, 8]. Silica and silica based materials have attracted great attention due to their special physicochemical properties, low cost and abundant supply and have been widely applied in many fields as molecular sieves, catalyst supports for gas absorption and separation and as raw materials for the glass industry [11, 12]. The demand for improved silica types with specific properties such as pore volume and size distribution, surface area or reactivity is fueling the search for innovative production of such materials [11, 12]

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