Acidic surface functional groups and mineral elements in Lakra coal (Sindh, Pakistan)

Khalid Saeed, Muhammad Ishaq, Imtiaz Ahmad, Muhammad Shakirullah, Sajjad Haider

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Surface acidity of virgin coal (Lakra Sindh, Pakistan) and variously extractcd/leached coal samples leached with HNO3 NaOH, and KMnO 4, were investigated by aqueous potentiometric titration employing KOH as a titrant. The titration curve of virgin coal showed that its surface might contain carboxyhc, carbonyl, phenolic and other weak acidic functional groups such as enols and C-H bond. The titration curves of leached coal samples showed inflections at pH 4-11, being not similar the inflections of carboxylic groups. This inflection might be given by functional groups like CO2, phenolic, enols and C-H. Mineral matter such as Fe, K, Zn, Mn and Ni were determined in the ash of coal by atomic absorption spectrophotometer and was found that Fe (3104 μg/g) in the highest and Ni (36.05 μg/g) in the lowest quantity is present in virgin coal sample,.

Original languageEnglish
Pages (from-to)162-167
Number of pages6
JournalJournal of the Chemical Society of Pakistan
Volume32
Issue number2
Publication statusPublished - Apr 2010
Externally publishedYes

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