Study on Defluoridation of Water by Using Activated Carbon Derived from Chestnut Shell as Adsorbent

The present work intended to produce new cost-effective alkali-treated adsorbents from chestnut shells with the purpose of removing fluoride from water, and to explore the effect of pyrolysis temperature on fluoride decontamination at different functional parameters. The microstructure and morphological characteristics of the resulting activated carbons were thoroughly investigated using BET, FTIR, XRD and SEM. The effectiveness of the prepared adsorbent materials in treating and remediating fluorinated water was evaluated. The impacts of several factors, including the dose of the adsorbent, the initial contamination of fluoride, pH as well as the effectiveness were investigated. In accordance with the data the highest adsorption was found to be at a 6 pH during 5 hours of processing duration and 0.5 g/L of dosage of adsorbent. The observational results were well-fit by the Freundlich isotherm model and the pseudo-second-order kinetic model. The highest ability and efficiency to adsorb fluoride was observed as 78%, at a pH value of 6 for 10 mg/L fluoride solution by the adsorbent prepared at 800 °C. Additional research on adsorption along with rejuvenation revealed that the reduction in adsorption potential to 10% following four repetitions of operation involving regeneration, thereby showcasing the adsorbent's versatile applicability for repeated use.