1. Al-Harby NF, Albahly EF, Mohamed NA (2021) Kinetics, isotherm and thermodynamic studies for efficient adsorption of Congo Red dye from aqueous solution onto novel cyanoguanidine-modified chitosan adsorbent. Polymers 13(24):4446
2. American Public Health Association (1926) Standard methods for the examination of water and wastewater. Vol. 6. 1926: American Public Health Association.
3. Baird R, Rice E, Eaton A. Standard methods for the examination of water and wastewaters. Water Environment Federation, Chair Eugene W. Rice, American Public Health Association Andrew D. Eaton, American Water Works Association. 2017; 1:71-90
4. Berihun D (2017) Removal of chromium from industrial wastewater by adsorption using coffee husk. J Mater Sci Eng 6(2):331
5. Bhunia A et al (2022) Bacterial biofilm mediated bioremediation of hexavalent chromium: a review. Biocatal Agric Biotechnol 43:102397