Abstract
The use of lemon peel powder, a novel, low-cost, and sustainable biosorbent derived from food waste, to remove arsenic has largely gone unexplored. The feasibility and viability of the As (III) biosorption abilities of lemon peel powder are compared in this study. The parameters such as contact time, pH, the amount of lemon peels used, the initial arsenic concentration, and temperature all had an effect on the sorption process. Thermodynamic, kinetic, and equilibrium were all evaluated. The optimal pH was 6.0, and it lasted until pH 8 with 72.34% removal efficiency. Lemon peel (LP) has a pH PZC value of 7 and a surface pH of 7. The analysis of kinetics revealed that the biosorption was regulated by a second-order reaction, as well as the fact that the catalytic region of the biosorbent was heterogeneous; however, the biosorption process was better defined by the Freundlich and Temkin isotherms. Finally, it is possible to remove arsenic (III) using waste content. Thermodynamic and equilibrium analysis have shown that sorption is a natural process that is spontaneous, beneficial, and endothermic. In addition, Fourier Transfer Infrared Spectroscopy (FTIR) research shows that arsenic reacts with metal oxides and the -OH functional group in lemon peel. These findings indicate that this peel can be used to remove arsenic from a simulated aqueous solution as a valuable, low-cost sorbent. This research lays the groundwork for the potential production of an effective filtration device that uses citrus peel powder as a low-cost, innovative, and long-lasting biosorbent to treat water polluted with arsenic (III). Keywords: Arsenic, Equilibrium, FTIR, Isotherms, Kinetic, PZC, Thermodynami DOI: 10.7176/JNSR/12-14-01 Publication date: July 31 st 2021
Highlights
Arsenic is found naturally in the earth's layers, but it is mobilised into ground and marine water as a result of human activities such as pesticide and herbicide use [2,33]
Contact time – Arsenic Biosorpiton: The experiment was carried out with a 50 μg/L arsenic concentration and a dosage of 1 gm lemon peel powder to determine the time required for the removal of arsenic species, and the plot of biosorption percentage and biosorption time revealed that the rapid removal of arsenic species was observed from 20 min to 40 min, with the rate stabilizing at 40 min, which is considered the optimum contact time as shown in Fig-4
Due to the sheathing of lemon peel powder particles around the binding sites, the binding sites become very limited, which may be due to the development of centrifugal forces between the arsenic on the solid surface and the liquid phase[34]
Summary
Arsenic is found naturally in the earth's layers, but it is mobilised into ground and marine water as a result of human activities such as pesticide and herbicide use [2,33]. According to recent survey results, higher levels of arsenic in ground water can be found in many areas of eastern Uttar Pradesh and Bihar, posing a health risk [9]. Biosorption is a cutting-edge technique for removing radioactive metals from contaminated streams. It makes use of natural materials like agricultural residues[15], forestry waste products [16], food waste materials, and fruit peel[18]. Citrus peel would have increased metallic ion biosorption potential due to the existence of a large number of -OH and -COOH functional groups found through FTIR research. The removal of arsenic from lemon peel powder was 90% in. The hydroxyl group and carboxylic acid may play a role in the removal of Arsenic metal
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