Abstract
A novel and simple method was described for preparation of carbonaceous adsorbent (CA) from corncob under phosphoric acid conditions. The method succeeded to introduce oxygen-containing groups onto the product surface through hydrothermal carbonization (HTC) at low temperature of 160 °C. Adsorption of methylene blue (MB) was studied systematically through the effect of pH, contact time and initial dye concentrations. The MB adsorption kinetics and isotherms experiments showed that Langmuir model and pseudo-second-order model could better describe the adsorption behavior, with a maximum adsorption capacity of MB was 140.25 mg/g. The high adsorption capacity could be ascribed to the presence of surface oxygen-containing functional groups and pore channels. In conclusion, it could be a potential adsorbent in the removal of methylene blue from wastewater.
Highlights
A novel and simple method was described for preparation of carbonaceous adsorbent (CA) from corncob under phosphoric acid conditions
In order to highlight the effect of H 3PO4 in hydrothermal carbonization (HTC) process, the carbonized corncob prepared without adding H 3PO4 was employed as a reference
The results show that the value of R2 for Langmuir isotherm model (0.993 for CA) was higher than that of Freundlich isotherm model (0.938 for CA), indicating that Langmuir isotherm model was better fitted to describe the adsorption of Methylene blue (MB) molecules onto CA
Summary
A novel and simple method was described for preparation of carbonaceous adsorbent (CA) from corncob under phosphoric acid conditions. The high adsorption capacity could be ascribed to the presence of surface oxygen-containing functional groups and pore channels It could be a potential adsorbent in the removal of methylene blue from wastewater. Chemical modification method is widely used presently to enhance their capabilities of biochar by introduction of oxygen-containing groups[31,32,33,34,35] These oxygen-containing groups on the surface serve as adsorption sites for organic pollutants in solution. The main purpose of this research was to develop an effective modification method for preparing an alternative corncobderived adsorbent with H 3PO4 at low temperature These works help to improve adsorption capability of biochar and greatly reduce the preparation temperature. We aim to characterize the properties of as-prepared adsorbent and study their sorption behaviors for MB
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