Preparation and adsorption properties of nano magnetite silica gel for methylene blue from aqueous solution

Removal of chromium(vi) from polluted wastewater by chemical modification of silica gel with 4-acetyl-3-hydroxyaniline

“…where q e (adsorption capacity) is the amount of adsorbed Cr(VI) ions at equilibrium (mg g À1 ), C e and C 0 (mg L À1 ) are the equilibrium and initial concentrations of Cr(VI) ions in an aqueous solution, V (L) is the volume of the aqueous chromium solution and m (g) is the mass of the Si-CPTS-AHAP adsorbent. 40,41 2.5. pH studies pH studies were carried out at various pH values (2.0, 3.0, 4.0, 5.0, 6.0, 7.0). 0.05 g of the Si-CPTS-AHAP adsorbent at 200 rpm was mixed with a 10 mL aqueous solution containing 1 Â 10 À4 mol L À1 K 2 Cr 2 O 7 and wastewater.…”

Amine Modification of Silica Aerogels/Xerogels for Removal of Relevant Environmental Pollutants

“…Heavy metals are released from mining, smelting and other metallurgic industries in great amounts; however, agriculture, transportation and energy production also significantly contribute to the increase of these pollutants [4,7,8]. Additionally, chemical dyes are employed in different industrial applications, namely in textiles, foods, cosmetics, pharmaceuticals or pesticides [9,10].…”

“…Due to their toxicity, associated with carcinogenic and mutagenic effects in some cases, there is a growing interest and need to remove these pollutants from wastewater effluents, from both health and environmental perspectives [3,10,11,12,13,14]. Nevertheless, this process is a recurrent challenge regarding volatile organic compounds (VOCs) due to their highly volatile nature and persistency in the environment [15].…”

“…From the examples reported above, the interaction between silica aerogels and the pollutants can be improved by modifying the aerogels’ surface chemistry. Apart from the presence of methyl groups, the presence of amino and carboxyl functional groups can also result in strong affinities towards specific contaminants [10,19,43,46]. However, some of these modifications result in the decrease of the specific surface area [10,44].…”

Synthesis of silica of rice husk modification (3-aminopropyl) trietoxysilane for adsorption methylene blue

“…The method of adsorption is one method that can be done in reducing pollution in the aquatic environment. The adsorbent used should have pore size, pore distribution and surface area [12,13]. One of the adsorbents that can be used for adsorption of organic dyes is silica.…”