Investigation of Bamboo Leaves as an Alternative Source of Silica: Extraction, Characterization and Its Application as an Adsorbent for Methylene Blue Sequestration

Abstract

The present study examines an alternative method for extracting silica from natural waste such as bamboo leaves (BL) via thermal combustion, followed by acid treatment and alkaline extraction. The physico-chemical properties of extracted silica were studied by comprehensive characterization tools. FESEM revealed that extracted silica is highly porous and interconnected. EDX, XRD and FTIR study confirmed the purity, amorphous nature and functional groups of extracted silica. The major interest of this paper was to functionalize extracted silica with alginate and to optimize the parameters such as pH (at 5), and equilibrium time (60 min) for the removal of methylene blue (MB) from aqueous solutions. The kinetic data was fitted well in the pseudo-second order model and the maximum adsorption capacity was found to be 54.35 mg/g. The favorability of the Langmuir isotherm suggested that the adsorption system was dominated by the monolayer adsorption process with uniform adsorption sites present on the surface. The morphological changes due to MB adsorption on prepared composites were authenticated by FTIR and DFT calculations. Therefore, the present investigation emphasizes the suitability of silica extraction from bamboo leaves waste over chemical precursors to synthesize adsorption composites.

Characteristic investigations on bio-silica gel prepared from teff (Eragrostis tef) straw: effect of calcination time

“…Therefore, it is an essential to look for a feasible and affordable method to produce silica gel. In this line, as a substitute in this case, preparation of silica gel using leftover biomass, such as rice husk ash [13], sugarcane leaf [14], palm tree [15], rice straw [16], oat husk [17], sugarcane bagasse [14], coffee husk [18], corn cob [19,20], wheat straw [21], maize leaves [22], bamboo leaf [23], and teff straw [24] are gaining more interest because of this approach addresses simple manufacturing procedure and economically affordable , can be a better option.…”

Magnetic Nanosorbents for Adsorption of Blood Mercury

“…Besides, magnetic nanomaterials have been widely used in the fields of heavy metal adsorption, drug delivery and so on. This is based on its magnetic response characteristics, and has the advantages of efficient recovery, convenient use and low cost [18–20] …”

“…This is based on its magnetic response characteristics, and has the advantages of efficient recovery, convenient use and low cost. [18][19][20] In order to improve the adsorption performance, here, we synthesized a novel tetraethylenepentamine expanded hyperbranched polyamide derivative using methyl acrylate as crosslinking agent and modified it onto the magnetic Fe 3 O 4 nanoparticles surface by a simple glutaraldehyde cross-linking method, effectively increasing the number of amino-active functional groups on the material and obtaining amino-rich magnetic nanoparticles (Fe/HPN-NH 2 NPs). By comparing the adsorption effect of the magnetic particles on mercury before and after chain expansion, it was demonstrated that the chain expansion of tetraethylenepentamine effectively improved the adsorption efficiency of the materials on mercury (inorganic mercury and methylmercury).…”