Ultrafast removal of methylene blue from water by Fenton-like pretreated peanut hull as biosorbent

Modified biomass is a green and renewable sorbent to remove organic pollutants in water. In this study, an efficient bio-based adsorbent was obtained by Fenton-like pretreatment of peanut hull with FeOCl, which can be used to efficiently remove methylene blue from water. The adsorption experiment showed that under the conditions of 25 degrees C, pH 6.0, MB concentration of 100 mg center dot L-1 and adsorbent dosage of 1.0 g center dot L-1, the adsorption equilibrium could be achieved within 6 min, with MB removal rate of 85.1% and maximum adsorption capacity of 132 mg center dot g(-1), which was much higher than that of untreated peanut hull (64 mg center dot g(-1)). Material characterization showed that Fenton-like pretreatment resulted in the surface morphology change and pore structure formation of peanut hull, and the specific surface area increased significantly, which was an important reason for rapid adsorption. The adsorption mechanism showed that the adsorption of methylene blue followed pseudo second-order models, and conformed to Redlich-Peterson and Langmuir models. According to the thermodynamic analysis results, it is concluded that the adsorption process is endothermic and spontaneous. Adsorption mechanism includes hydrogen bonding, static electricity and van der Waals force.

Automated summary

In this study, a highly efficient bio-based adsorbent was obtained by Fenton-like pretreatment of peanut hull, which can be used to effectively remove methylene blue from water. The pretreatment resulted in surface morphology changes, formation of pore structure, and a significant increase in specific surface area of peanut hull, which greatly enhanced its adsorption capacity.