Preparation and characterization of activated carbon & amorphous silica from rice husk

Abstract

Activated carbon (AC) was prepared by the conventional carbonization and KOH activation and amorphous silica was extracted by alkali extraction followed by acid precipitation from rice husk on a laboratory scale. The performance of the produced activated carbon and amorphous silica were examined using I2 value measurement, methylene blue (MB) adsorption test, pH measurement, FTIR and SEM-EDX analysis. The optimum temperature for production of AC was obtained at 700 0C. The AC by alkali extraction method was show higher activity than KOH activation. The maximum I2 value, MB adsorption value & pH value shows at 700 0C followed by alkali extraction with 15% NaOH, which were 510.82 mg/g, 61.1 mg/g and 7.32 respectively. The FTIR analysis shows presence of Si-O-Si bond with a strong peak at 1078.28 cm-1. The SEM image of silica sample shows that the most of organic component is burnt out during combustion.Bangladesh J. Sci. Ind. Res. 50(4), 263-270, 2015

Rice Husk-Derived High Surface Area Nanoporous Carbon Materials with Excellent Iodine and Methylene Blue Adsorption Properties

“…Using both physical and chemical activation methods, activated carbons can be prepared from rice husks [51,52]. The silica embedded in rice husk as nanoparticles [53] can be leached out using chemical activating agents and thus the leaching out of the silica causes pore formation in the carbon material [54].…”

Production of Activated Carbon From Rice Husk and Its Proximate Analysis

“…It can be determined with the difference between the weight of char with activation reagent and weight of product after activation. It can be expressed as equation 4 (Rhaman, et al, 2015).…”

Improvement and characterization of alum sludge by nano-iron oxide and rice husk for removal of methylene blue dye from aqueous solution

“…Prepared alum sludge (AS) and acid treated rice husk (RH treated) were mixed with weight ratio of (2:1) rice husk to alum sludge then calcinated at 700 0 C for 2hr by electric muffle furnace to improve the adsorption characteristics of (AS) (Nasser H. Shalaby et al, 2017). The temperature (700 o C) was determined as optimum temperature in previous studies to obtain highly percentage of amorphous silica from (RH) for high adsorption (Maksum, 2017;Iara et al, 2017;Rhaman et al, 2015;Kurama and Kurama, 2003). Also, 700 o C for 2hrs has been chosen in the present study for calcination since the activated sludge adsorbents developed by physical activation at 700 o C from drinking water treatment (AS) are suitable adsorbents to remove metals and cationic dyes (Soleha et al, 2017).…”