[1] Mahatma Gandhi Univ, Sch Chem Sci, Kottayam 686560, Kerala, India
[2] Bishop Moore Coll, Post Grad Dept Chem, Mavelikkara 690101, Kerala, India
[3] Nelson Mandela Metropolitan Univ, Fac Sci, Dept Text Sci, ZA-6000 Port Elizabeth, South Africa
[4] CSIR, Mat Sci & Manufacturing Fibres & Text Competence, ZA-6000 Port Elizabeth, South Africa