Study of Complexation Behaviour of Lignite Extracted Humic Acid with Some Divalent Cations

Pervez Iqbal; Kiran Aftab

doi:10.56741/esl.v2i03.431

Authors

Pervez Iqbal
perveziqbal572@gmail.com
Government College University https://orcid.org/0000-0001-7153-8439
Kiran Aftab Government College University https://orcid.org/0000-0003-4194-2478

Keywords:

Characterisation, Humic Acid–Metal Complex, Synthesis, TGA, XRD Analysis

Abstract

In biogeochemical cycles, humic substances are natural electron shuttles in transforming nutrients and environmental pollutants. Humic acid complexes with macro and micronutrient metals are eco-friendly organo-mineral fertilisers. This study prepared and characterised lignite-extracted humic acid-metal (Fe, Mg, Zn) complexes. The proximate analysis exhibited the moisture, volatile matter, ash and fixed carbon contents of extracted humic acid of 02.61%, 17.31%, 57.18% and 22.90%, respectively. The percentage of metal ions in humic acid complexes ranges from 3.5-7.25%. The FTIR analysis of coal-extracted humic acids-metal complexes showed Zn, Mg and Fe ions complexed in a bidentate manner predominantly with the carboxylic acid moiety of humic acid. Thermal gravimetric analysis indicated a higher value of humic acid decomposition than their metal complexes. The thermal stability observed order is HA- Zn >HA-Fe>HA- Mg. The X-ray diffraction pattern pointed toward the noncrystalline nature of humic acid and their respective complexes due to having few intense and small diffuse peaks in the 2θ range from 0 to 80°. Hence, the humic acid-metals complexes increase the soil humic content and the availability of essential nutrients that enhance the loam's biotic action.

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Author Biographies

Pervez Iqbal, Government College University

is a dedicated academician and researcher associated with the Department of Chemistry at Government College University in Faisalabad, Pakistan. His commitment to the field of chemistry is reflected in his contributions to research and education. With a keen interest in the intricacies of chemistry, he has actively participated in academic and research endeavours. His educational journey and research pursuits have allowed him to delve into the complexities of chemical phenomena, enabling a deeper understanding of the subject. His work is a valuable asset to the academic community, contributing to the advancement of chemical science. (email: perveziqbal572@gmail.com).

Kiran Aftab , Government College University

is a dedicated professional in the field of chemistry, actively contributing to academic and research pursuits. She is associated with the Department of Chemistry at Government College University in Faisalabad, Pakistan. As a member of the academic community, she plays a vital role in shaping the future of chemistry. She is committed to nurturing the talents of aspiring scientists and contributing to the advancement of chemical science. (email: kiranaftab@gcwuf.edu.pk).

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