Extraction and Chemical Characterization of Humic Acid from Nitric Acid Treated Lignite and Bituminous Coal Samples
Currently, conversion of coal into alternative fuel and non-fuel valuable products is in demand and growing interest. In the present study, humic acid was extracted from two different ranks of coal, i.e., low rank and high rank (lignite and bituminous), through chemical pretreatment by nitric acid....
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doaj-4cfb07f1cfae4be2a6a9616f668fd5682021-08-26T14:21:35ZengMDPI AGSustainability2071-10502021-08-01138969896910.3390/su13168969Extraction and Chemical Characterization of Humic Acid from Nitric Acid Treated Lignite and Bituminous Coal SamplesNoureen Fatima0Asif Jamal1Zaixing Huang2Rabia Liaquat3Bashir Ahmad4Rizwan Haider5Muhammad Ishtiaq Ali6Tayyba Shoukat7Zeid A. ALOthman8Mohamed Ouladsmane9Tariq Ali10Shafqat Ali11Naseem Akhtar12Mika Sillanpää13Department of Microbiology, Quaid-i-Azam University Islamabad, Islamabad 45320, PakistanDepartment of Microbiology, Quaid-i-Azam University Islamabad, Islamabad 45320, PakistanSchool of Chemical Engineering and Technology, University of Mining and Technology, Xuzhou 221116, ChinaU.S. Pakistan Centre for Advanced Studies in Energy, National University of Sciences and Technology, Islamabad 45320, PakistanDepartment of Biological Sciences, International Islamic University, Islamabad 44000, PakistanInstitute of Energy & Environmental Engineering, University of Punjab, Lahore 54590, PakistanDepartment of Microbiology, Quaid-i-Azam University Islamabad, Islamabad 45320, PakistanDepartment of Chemistry, Government College University, Faisalabad 38000, PakistanChemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaChemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi ArabiaDepartment of Chemistry, The University of Lahore, Lahore 54590, PakistanDepartment of Environmental Science and Engineering, Government College University, Faisalabad 38000, PakistanDepartment of Chemistry, The Government Sadiq College Women University, Bahawalpur 63100, PakistanDepartment of Civil and Environmental Engineering, Florida International University, Miami, FL 33199, USACurrently, conversion of coal into alternative fuel and non-fuel valuable products is in demand and growing interest. In the present study, humic acid was extracted from two different ranks of coal, i.e., low rank and high rank (lignite and bituminous), through chemical pretreatment by nitric acid. Samples of lignite and bituminous coal were subjected to nitric acid oxidation followed by extraction using KOH and NaOH gravimetric techniques. The chemical pretreatment of both types of coal led to enhanced yields of humic acid from 21.15% to 57.8% for lignite low-rank coal and 11.6% to 49.6% bituminous high rank coal. The derived humic acid from native coal and nitric acid treated coal was analyzed using elemental analysis, E4/E6 ratio of absorbance at 465 nm and 665 nm using UV-Visible spectrophotometry and Fourier transformed infrared spectroscopy FTIR. The chemical characteristics of coal treated with nitric acid have shown increased molecular weight and improved aromaticity with more oxygen and nitrogen and lower C, H, and sulphur content. The E4/E6 ratio of nitric acid-treated low and high ranks of coal was high. The FTIR spectroscopic data of nitric acid-treated lignite coal indicates an intensive peak of carboxyl group at 2981.84 cm<sup>−1</sup>, while bituminous coal was shown in cooperation with the N-H group at 2923.04 cm<sup>−1</sup>. SEM was performed to detect the morphological changes that happen after producing humic acid from HNO<sub>3</sub> treatment and native coal. The humic acid produced from HNO<sub>3</sub> treated coal had shown clear morphological changes and some deformations on the surface. SEM-EDS detected the major elements, such as nitrogen, in treated humic acid that were absent in raw coal humic acid. Hence, the produced humic acid through HNO<sub>3</sub> oxidation showed a more significant number of humic materials with improved efficiency as compared to native coal. This obtained humic acid can be made bioactive for agriculture purposes, i.e., for soil enrichment and improvement in growth conditions of plants and development of green energy solutions.https://www.mdpi.com/2071-1050/13/16/8969lignite coalbituminous coalpretreatmentnitric acid |
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language |
English |
format |
Article |
sources |
DOAJ |
author |
Noureen Fatima Asif Jamal Zaixing Huang Rabia Liaquat Bashir Ahmad Rizwan Haider Muhammad Ishtiaq Ali Tayyba Shoukat Zeid A. ALOthman Mohamed Ouladsmane Tariq Ali Shafqat Ali Naseem Akhtar Mika Sillanpää |
spellingShingle |
Noureen Fatima Asif Jamal Zaixing Huang Rabia Liaquat Bashir Ahmad Rizwan Haider Muhammad Ishtiaq Ali Tayyba Shoukat Zeid A. ALOthman Mohamed Ouladsmane Tariq Ali Shafqat Ali Naseem Akhtar Mika Sillanpää Extraction and Chemical Characterization of Humic Acid from Nitric Acid Treated Lignite and Bituminous Coal Samples Sustainability lignite coal bituminous coal pretreatment nitric acid |
author_facet |
Noureen Fatima Asif Jamal Zaixing Huang Rabia Liaquat Bashir Ahmad Rizwan Haider Muhammad Ishtiaq Ali Tayyba Shoukat Zeid A. ALOthman Mohamed Ouladsmane Tariq Ali Shafqat Ali Naseem Akhtar Mika Sillanpää |
author_sort |
Noureen Fatima |
title |
Extraction and Chemical Characterization of Humic Acid from Nitric Acid Treated Lignite and Bituminous Coal Samples |
title_short |
Extraction and Chemical Characterization of Humic Acid from Nitric Acid Treated Lignite and Bituminous Coal Samples |
title_full |
Extraction and Chemical Characterization of Humic Acid from Nitric Acid Treated Lignite and Bituminous Coal Samples |
title_fullStr |
Extraction and Chemical Characterization of Humic Acid from Nitric Acid Treated Lignite and Bituminous Coal Samples |
title_full_unstemmed |
Extraction and Chemical Characterization of Humic Acid from Nitric Acid Treated Lignite and Bituminous Coal Samples |
title_sort |
extraction and chemical characterization of humic acid from nitric acid treated lignite and bituminous coal samples |
publisher |
MDPI AG |
series |
Sustainability |
issn |
2071-1050 |
publishDate |
2021-08-01 |
description |
Currently, conversion of coal into alternative fuel and non-fuel valuable products is in demand and growing interest. In the present study, humic acid was extracted from two different ranks of coal, i.e., low rank and high rank (lignite and bituminous), through chemical pretreatment by nitric acid. Samples of lignite and bituminous coal were subjected to nitric acid oxidation followed by extraction using KOH and NaOH gravimetric techniques. The chemical pretreatment of both types of coal led to enhanced yields of humic acid from 21.15% to 57.8% for lignite low-rank coal and 11.6% to 49.6% bituminous high rank coal. The derived humic acid from native coal and nitric acid treated coal was analyzed using elemental analysis, E4/E6 ratio of absorbance at 465 nm and 665 nm using UV-Visible spectrophotometry and Fourier transformed infrared spectroscopy FTIR. The chemical characteristics of coal treated with nitric acid have shown increased molecular weight and improved aromaticity with more oxygen and nitrogen and lower C, H, and sulphur content. The E4/E6 ratio of nitric acid-treated low and high ranks of coal was high. The FTIR spectroscopic data of nitric acid-treated lignite coal indicates an intensive peak of carboxyl group at 2981.84 cm<sup>−1</sup>, while bituminous coal was shown in cooperation with the N-H group at 2923.04 cm<sup>−1</sup>. SEM was performed to detect the morphological changes that happen after producing humic acid from HNO<sub>3</sub> treatment and native coal. The humic acid produced from HNO<sub>3</sub> treated coal had shown clear morphological changes and some deformations on the surface. SEM-EDS detected the major elements, such as nitrogen, in treated humic acid that were absent in raw coal humic acid. Hence, the produced humic acid through HNO<sub>3</sub> oxidation showed a more significant number of humic materials with improved efficiency as compared to native coal. This obtained humic acid can be made bioactive for agriculture purposes, i.e., for soil enrichment and improvement in growth conditions of plants and development of green energy solutions. |
topic |
lignite coal bituminous coal pretreatment nitric acid |
url |
https://www.mdpi.com/2071-1050/13/16/8969 |
work_keys_str_mv |
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