Comparative Study on Extraction of Humic Acid from Pakistani Coal Samples by Oxidizing the Samples with Hydrogen Peroxide

Muhammad Asif


Humic Acid is soil conditioning agent, which is used for improving the soil chemistry, plant root growth and related metabolism. Pakistan is an agricultural country and about 70% of population is directly or indirectly linked to the agricultural sector. Coal is considered one of the most appropriate raw materials for humic acid. The yield of extracted humic acid from coal is inversely proportional to the rank of coal. Since, majority of Pakistani coals are of low rank, extraction of humic acid from indigenous coal may be one of the non-fuels uses of coal. Three different coal sample from Thar, Dukki and Chamalong coalfields were treated with 3% H2O2 solution for determining the impact of oxidation on humic acid yield. The yield of humic acid from H2O2 treated samples were as follows; 2.5% for Chamalong coal sample, 16.5% from Dukki, and 35% from Thar coal sample. Thar coal sample, being the lowest in rank among all experimented coal samples, yielded higher fraction of humic acid.


H2O2 oxidation; Low rank coal; Humic acid from coal

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Abedullah, N., Khalid, M., and Kouser, S. (2009). The role of agricultural credit in the growth of livestock sector: A case study of Faisalabad. Pakistan Veterinary Journal, 29(2), 81-84.

Kopittke, P. M., Lombi, E., Wang, P., Schjoerring, J. K., and Husted, S. (2019). Nanomaterials as fertilizers for improving plant mineral nutrition and environmental outcomes. Environmental Science: Nano, 6(12), 3513-3524.

Cheng, G., Niu, Z., Zhang, C., Zhang, X., and Li, X. (2019). Extraction of Humic Acid from Lignite by KOH-Hydrothermal Method. Applied Sciences, 9(7), 1356.

Haider, R., Ghauri, M. A., and Akhtar, K. (2015). Isolation of coal degrading fungus from drilled core coal sample and effect of prior fungal pretreatment on chemical attributes of extracted humic acid. Geomicrobiology Journal, 32(10), 944-953.

Ibarra, J., and Juan, R. (1985). Structural changes in humic acids during the coalification process. Fuel, 64(5), 650-656.

Khaled, H., and Fawy, H. A. (2011). Effect of different levels of humic acids on the nutrient content, plant growth, and soil properties under conditions of salinity. Soil and Water Research, 6(1), 21-29.

Kucerik, J., Kovar, J., and Pekar, M. (2004). Thermoanalytical investigation of lignite humic acids fractions. Journal of Thermal Analysis and Calorimetry, 76(1), 55-65.

Kumar-Tayi, G., Rubin, E. S., and Lincoln, D. R. (1985). Cross-media environmental impacts of air pollution regulations for a coal liquefaction process plant. Journal of the Air Pollution Control Association, 35(1), 35-40.

Li, X., Ashida, R., and Miura, K. (2012). Preparation of high-grade carbonaceous materials having similar chemical and physical properties from various low-rank coals by degradative solvent extraction. Energy and Fuels, 26(11), 6897-6904.

Mahmood, A., Javaid, N., Zafar, A., Riaz, R. A., Ahmed, S., and Razzaq, S. (2014). Pakistan's overall energy potential assessment, comparison of LNG, TAPI and IPI gas projects. Renewable and Sustainable Energy Reviews, 31(2014), 182-193.

Malkani, M. S., and Mahmood, Z. (2016). Coal Resources of Pakistan: entry of new coalfields. Geological Survey of Pakistan, Information Release, 981(2016), 1-28.

Miura, K. (2000). Mild conversion of coal for producing valuable chemicals. Fuel Processing Technology, 62(2-3), 119-135.

Mukherjee, S., Mahiuddin, S., and Borthakur, P. (2001). Demineralization and desulfurization of subbituminous coal with hydrogen peroxide. Energy and Fuels, 15(6), 1418-1424.

Saikia, B. K., Dutta, A. M., and Baruah, B. P. (2014). Feasibility studies of de-sulfurization and de-ashing of low grade medium to high sulfur coals by low energy ultrasonication. Fuel, 123, 12-18.

Schobert, H. (2014). Production of acetylene and acetylene-based chemicals from coal. Chemical Reviews, 114(3), 1743-1760.

Wang, P., Jin, L., Liu, J., Zhu, S., and Hu, H. (2013). Analysis of coal tar derived from pyrolysis at different atmospheres. Fuel, 104(2013), 14-21.

Wang, Z., Ding, J., Xie, P., Chen, Y., Wan, Y., and Wang, S. (2018). Formation of halogenated by-products during chemical cleaning of humic acid-fouled UF membrane by sodium hypochlorite solution. Chemical Engineering Journal, 332(2018), 76-84.

Zara, M., Ahmad, Z., Akhtar, J., Shahzad, K., Sheikh, N., and Munir, S. (2017). Extraction and characterization of humic acid from Pakistani lignite coals. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 39(11), 1159-1166.



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