Funding for this research was provided by:
the National Natural Science Foundation of China (21962001)
the National Natural Science Foundation of China (21862001)
Ningxia Scientific and Technological Innovation Leading Personnel Training (KJT2017006)
The talent highland of research and development of high-value utilization technology of low-quality resources in Ningxia, China
Clean Energy Institute (ZDZX201803)
Article History
Received: 16 October 2019
Accepted: 14 February 2020
First Online: 21 February 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.