Document Type : Regular Article

Authors

1 DEPARTMENT OF PHYSIOLOGY Saveetha Dental College and Hospitals Saveetha Institute of Medical and Technica

2 Marine Material Chemistry Lab, Department of Physiology, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 600077, Tamil Nadu, India.

10.22036/pcr.2024.437830.2471

Abstract

Brown seaweed is a biosorbent for textile dyes from industrial effluent, but the presence of pigments and particle size restricts its adsorption capabilities and kinetics. Here, we fabricated seaweed Sargassum wightii as carbonated ash (SWCA) for cationic (methylene blue (MB), crystal violet (CV), safranin (SAF)) and anionic dyes (congo red (CR)). Biosorbent SWCA contains hydroxyl, primary amines, carboxyl, OH, C-O, C≡C-H, C=C, C-C≡C, C-N, N-H, and other functional groups. The pyrolysis process transformed the several types of oxygen in the seaweed waste into carbon-oxygen single bonds, which functioned as a bonding chain. The X-ray diffraction (XRD) spectra of SWCA diffractograms show that the structure is crystalline. As the calcite peak grows stronger, the Ca (OH)Cl peaks become weaker. The scanning electron microscope (SEM) image showed that organic carbonization caused SWCA pores. Strong energy dispersion x-ray (EDX) signals for C, O, Na, S, Cl, K, and Ca indicate SWCA has been carbonized. This investigation showed that when the concentration of SWCA was increased from 0.5 to 2 g/L, the quantity of MB, CV, SAF, and CR adsorbed dyes decreased significantly.

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