1. Department of Chemistry, College of Science, King Faisal University, Al-Hofuf 31982, Saudi Arabia
2. Department of Chemistry, Faculty of Science, Khartoum University, P.O. Box 321, Khartoum 11111, Sudan
3. Department of Applied and Industrial Chemistry, Faculty of Pure and Applied Sciences, International University of Africa, Khartoum 11111, Sudan
4. Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
5. Chemistry and Nuclear Physics Institute, Sudan Atomic Energy Commission, P.O. Box 3001, Khartoum 11111, Sudan