TY - JOUR
T1 - Acidic surface functional groups and mineral elements in Lakra coal (Sindh, Pakistan)
AU - Saeed, Khalid
AU - Ishaq, Muhammad
AU - Ahmad, Imtiaz
AU - Shakirullah, Muhammad
AU - Haider, Sajjad
PY - 2010/4
Y1 - 2010/4
N2 - 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,.
AB - 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,.
UR - http://www.scopus.com/inward/record.url?scp=79952028858&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:79952028858
SN - 0253-5106
VL - 32
SP - 162
EP - 167
JO - Journal of the Chemical Society of Pakistan
JF - Journal of the Chemical Society of Pakistan
IS - 2
ER -