Environmental
pollution and resource shortage are two major challenges
facing the world today, and resourcization of precious metals is one
of the effective strategies to confront these problems. Precious metals,
known for their high performance and scarcity, are indispensable our
current lives. As nonrenewable resources, the demand and consumption
of precious metals are increasing every year. Therefore, it is necessary
to develop green and efficient precious metal recovery technologies
to alleviate the environmental and resource crisis. This perspective
summarizes various typical precious metal recovery strategies and
pays attention to innovations from traditional technologies. We also
evaluate and prospect the above methods based on secondary pollution
and recovery efficiency.
The health and environmental problems caused by volatile organic compounds (VOCs) have attracted wide attention. Photocatalytic technology provides a green and sustainable way for VOCs removal. How to build a highly efficient and stable photocatalyst is of great significance to promote the practical application of photocatalysis technology. In this review, the literatures on photocatalytic oxidation in VOCs are surveyed and systematically categorized based on the types of photocatalytic materials. The methods of improving photocatalytic activity are studied, and the deactivation process of photocatalyst is discussed. Finally, the reaction mechanism is summarized according to the charge separation process and the classification of reactive oxygen species.
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