Open AccessSynthesis and Characterization of Novel Rice Husk Hydrogel and Cross Linked Acrylic Acid-Rice Husk Hydrogel for the Adsorption of Chromium(VI) from Wastewater
Author(s) -
A. L. Verma,
Kalpana Singh,
Kushagra Rajendra
Publication year - 2020
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2020.22804
Subject(s) - husk , adsorption , chromium , chemistry , freundlich equation , wastewater , nuclear chemistry , langmuir , aqueous solution , langmuir adsorption model , acrylic acid , polymer , organic chemistry , waste management , botany , engineering , biology , monomer
The main purpose of this research is to develop a low-cost and novel bioadsorbent hydrogel from rice husk (PRH) and modified rice husk(MRH) by carboxymethylation and grafting for the effective removal of chromium(VI) from aqueous solutions. The characterization andphysico-chemical parameters of the bioadsorbents (PRH and MRH) was also performed. It was found that -CHO, >C=O, C-OH, Si-OHand -Si-H groups widely contributed towards the adsorption of chromium(VI) into the surface of bioadsorbents. The adsorption studieshad been conducted using batch experiments. The adsorption equilibrium were analyzed and described by Freundlich, Langmuir andDubinin-Radushkevish (D-R) isotherm models. It was observed that maximum adsorption of chromium(VI) was attained at pH 2. Theoptimized conditions regarding the removal of Cr(VI) using PRH (65%) and MRH (78%) as bioadsorbents were at 0.5 g/L of adsorbentdose, 120 min of contact time and pH 2. The results showed that rice husk residue based hydrogel has the potential to be used as a lowcostbiosorbent for the removal of Cr(VI) from wastewater.