1. College of Chemistry and Pharmaceutical Engineering Hebei University of Science and Technology Shijiazhuang 050018 P. R. China
2. Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Johannesburg Doornfontein 2028 South Africa
3. African Energy Leadership Centre WITS Business School & Molecular Science Institute School of Chemistry University of Witwatersrand Johannesburg 2050 South Africa
4. Institute for Development of Energy for African Sustainability University of South Africa Florida 1709 South Africa
5. Hebei Electronic Organic Chemicals Technology Innovation Center Shijiazhuang 050018 P. R. China