1. School of Chemistry and Environment, Yunnan Minzu University, Kunming, PR China;
2. Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan Province, Yunnan Minzu University, Kunming, PR China;
3. National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming, Yunnan, China;
4. Department of Metallurgical Engineering, College of Mines and Earth Sciences University of Utah, Salt Lake City, UT, USA