• D.Swpna Sundari
• V. Ramesh Kumar

The Batches of the adsorbents from milled Lemon Peel were tested for their ability to bind Cd (II), Zn (II), and Cr (III). The batch experiments demonstrated that the adsorption was affected by the biomass dose, the pH of the solution, and the initial concentration of the metal. Inversely, metal removal efficiency declined with increasing metal concentration. Three adsorption isotherm models (Langmuir, Freundlich, and Dubinin- Radushkevich) were used to assess the equilibrium data. In the case of equilibrium, the Langmuir isotherm model (R21) is the most accurate. Isotherm studies have been used to ascertain the thermodynamic properties of the procedure. The intraparticle diffusion rate constant, pseudo-first order, and second order kinetic properties of adsorption were determined, and the second order kinetic model was used to describe the data. Maximum amounts of heavy metals (qmax) adsorbed at equilibrium for Cd (II), Zn (II), and Cr (III) were 17.5, 31.85, and 25.28 mg/g for lemon peel, and 19.6, 26.28, and 27.67 mg/g for Cd (II), Zn (II), and Cr (III), respectively. The solid-support regeneration study also included a desorption experiment. Temperatures between 20 and 600 degrees Celsius were shown to have a noticeable effect on the adsorption capacity. Enthalpy measurements indicated that the adsorption process is endothermic. The adsorbents' surface shape and functionality were studied using scanning electron microscopy and Fourier transform infrared spectroscopy (FTIR), respectively. According to FTIR study, the hydroxyl, carboxyl, and carbonyl groups present in lemon peel aid in the adsorption of metal ions.

Adsorption isotherms, Cd (II) Zn(II) Cu(II) and Cr(II), electron microscopy, FTIR

"Adsorption Study of Natural Resource Remove Heavy Metal in Lemon Peel", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.10, Issue 7, page no.h197-h202, July-2023, Available :http://www.jetir.org/papers/JETIR2307723.pdf

"Adsorption Study of Natural Resource Remove Heavy Metal in Lemon Peel", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.10, Issue 7, page no. pph197-h202, July-2023, Available at : http://www.jetir.org/papers/JETIR2307723.pdf