Journal: Environmental Contaminants Reviews (ECR)
Author: Mariya Kiran Baloch, Rafi-u-Zaman Brohi, Khan Muhammad Brohi, Shafquat Ali Baloch, Amanullah Mahar, Madeeha Kiran

This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

Doi:10.26480/ecr.01.2022.01.08

ABSTRACT

Water pollution is serious concern due to large quantity of colored wastewater discharged from various industrial outlets i.e. textile, and no proper treatment methods are being used to decolor such wastewater. Untreated liquid effluents are discharged in marine ecosystems i.e. lakes, ponds, posing a very serious risk to aquatic life, flora and fauna. It reduces the ability of light penetration to reach deep down in water resulting in a decrement of biological oxygen demand in water bodies. Therefore, the treatment of colored wastewater is significant before discharge. The conventional treatment options are costly and time consuming. The textile dyes can be removed through adsorption using cost effective and eco-friendly adsorbents. This work was aimed to test the potential of Bio-adsorbent waste like eggshells, date palm seeds, and papaya seeds¬¬ to remove methylene blue dye and their effects on following parameters such as dosage mg/g, pH, initial concentration, contact time and speed rpm. The characterization of surface adsorbents was assessed by Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy and Energy Dispersive Spectroscopy. Various isotherms included like fitted Langmuir Freundlich and Kinetic model for the adsorption data. The kinetic study of Methylene blue dye on Adsorbents Eggshell, Date palm seeds and Papaya seeds follow pseudo-second order reaction. Lastly the desorption of Methylene blue dye on Eggshell, Date palm seeds and Papaya seeds using 0.1M HCL. The restoration % of dye on each adsorbent was different found. It can be accepted that adsorbent material as a useful eco–friendly for the removal of MB.

KEYWORDS
Methylene blue, wastewater pollution, pigment wastewater treatment, eggshell, date and papaya seeds