Effect of Preparation Conditions on the Adsorption of Heavy Metal Ions from Aqueous Solution by Mesoporous Silica Materials Prepared Using Organic Template (HDTMAB)

Abstract

This paper describes the simple hydrothermal preparation of self-adsorbing mesoporous materials using hexadecyltrimethyl ammoniumbromide (HDTMAB) as the template without any functionalization. The template was readily removed upon calcination, as confirmed through Fourier transform infrared spectroscopic analysis. The effects of preparation methods were explored under various experimental conditions. We found that the temperature, time, calcination conditions, and pH all affected the distribution of pore sizes and the surface area, whereas higher pH (strong base) did not favor the preparation of a porous medium because of OH inhibition. We obtained a relatively high surface area (1568.72 m 2 • g -1 ) and large pore size (3.07 nm) under the optimal reaction conditions. A study of the Langmuir adsorption of metal ions (e.g., Pb 2+ , Cu 2+ , Ni 2+ ) revealed that it was a physical phenomenon with the maximum adsorption occurring for the sample prepared under the optimized experimental conditions, with Pb 2+ (6.61 mg • g -1 ) exhibiting enhanced adsorption relative to Cu 2+ (3.46 mg • g -1 ) and Ni 2+ (2.25 mg • g -1 ) because of its larger ionic radius and higher electronegativity. Thus, such as-synthesized mesoporous materials hold great potential for use in the removal of heavy metal ions from aqueous solutions compared to commercially available powdered activated carbon (PAC).

Adsorption of Scandium and Neodymium on Biochar Derived after Low-Temperature Pyrolysis of Sawdust

“…This was anticipated since AC apart from being an established commercial adsorbent has a much larger specific surface area (912.10 m 2 ·g −1 ) compared to biochar Sd350 (4.71 m 2 ·g −1 ); the adsorption percentages calculated though are not proportional to the surface area of each adsorbent. For both adsorbents, Nd exhibited the highest tendency for adsorption compared to Sc, and this may be the result of its larger ionic radius (112.3 pm (porometers) for Nd and 88.5 pm for Sc) [26,71]. Finally, both adsorbents exhibit quite similar adsorption rates for Nd and Sc, which decrease with increasing adsorbent concentration.…”

Carbon Xerogels for Effluent Treatment

“…111 Adsorption involves numerous interactions betwixt the molecules of adsorbate and adsorbent in the form of some secondary forces of attraction. High effectiveness, ample availability, and low cost of adsorbents make it very attractive for the catalytic reduction and removal of dye 112 and heavy metal ions 113 from effluent. CXs are the so-far popular, and effective adsorbents of dye pollutants from water solutions.…”

An Efficient Cost-Effective Removal of Ca2+, Mg2+, and Cu2+ Ions from Aqueous Medium Using Chlorosodalite Synthesized from Coal Fly Ash

“…Such cost may be reduced by using coal fly ash. Different types of adsorbents like peanut shells, fruit peels, animal bones, mesoporous silica, activated carbon, chelating ligand, soya cake, and rice husk are also used by many workers for heavy metal ion removal from their aqueous medium. But synthetic zeolites have a better sorption ability than other adsorbents.…”