Novel adsorbent from sago-grafted silica for removal of methylene blue

Abstract

Eco-friendly and low-cost adsorbent prepared from sago waste was investigated for the removal of methylene blue. Sago "hampas," an abundant waste from sago industries, was transformed into activated carbon followed by chemical grafting with silica from activated rice husk in the presence of 3-(triethoxysilyl)-propylamine to afford sago-grafted silica 80:20 (wt/wt%) and 50:50 (wt/wt%). The physicochemical properties of the adsorbents were characterized, and their effectiveness in removing methylene blue was studied based on initial concentration (2-10 mg/L), adsorbent dosage (0.02-0.1 g and 0.1-0.5 g), and temperature (30 °C, 40 °C, 50 °C). Sagografted silica 80:20 showed excellent mesoporous properties and better adsorption capacity (86.43%) compared to sago-activated carbon (74.78%) and sago-grafted silica 50:50 (39.56%). The adsorption of methylene blue employing both sago-activated carbon and sago-grafted silica 80:20 was following pseudo-second-order kinetics model with Langmuir isotherm regression coefficient > 0.9, which indicate a monolayer adsorption. The maximum adsorption capacity of sago-activated carbon and sago-grafted silica 80:20 were 7.69 mg/g and 10.31 mg/g, respectively. Sagografted silica 80:20 is a potential low-cost natural sorbent which works best in the removal of methylene blue from environment. Keywords Sago hampas Rice husk activated Langmuir isotherm Mesoporous AdsorptionEditorial responsibility: J Aravind. 12/17/2018Novel adsorbent from sago-grafted silica for removal of methylene blue | SpringerLink https://

Preparation of porous silica materials using a eucalyptus template method and its efficient adsorption of methylene blue

“…In a previous study, the same adsorption kinetic trends were observed for the synthesis of nano-silica-coated magnetic carbonaceous adsorbents for the adsorption of MB in water using a lowtemperature hydrothermal carbonization technique (HCT), indicating that the adsorption of MB by PSAM is controlled by multiple processes and not by a single process [13,35]. Activated lignin-chitosan extruded pellets (ALiCE) 36.25 [4] Carboxymethyl chitosan-modi ed magnetic-cored dendrimers (CCMDs) 96.31 [37] Mesoporous silicon carbon (MSC) 156.56 [38] Magnetic starch-based composite hydrogel microspheres (SCHMs) 88.33 [39] Hydrophobic (surface modi ed) silica aerogel (MSA) 65.74 [40] Paintosorp 44.64 [41] Sago-grafted silica 80:20 10.31 [42] PSAM 90.01 This work 3 shows the parameters of the adsorption isotherm t. From the data of the graphs, it can be seen that the R 2 of the Langmuir model is close to 1, so the Langmuir model is more applicable to the adsorption of PSAM on MB [43]. The Langmuir model applies to the adsorption of the monomolecular layer, so the adsorption of PSAM on MB is of monomolecular layer adsorption.…”

Untitled

“…The results showed a highly significant surface area difference between untreated and treated biochar. The large surface area of SAC was due to the larger pore size of SAC (Rajan et al, 2019). The surface area of SAC is highly dependent on the carbonization temperature with a higher temperature giving larger surface areas (Hu & Srinivasan, 1999).…”