I am a Professor of Environmental and Energy Engineering. My research group focuses on circular economy innovation by developing low-carbon clean technologies for sustainable waste management and carbon-neutrality based on multidisciplinary sciences in environmental and energy engineering, thermochemical and physicochemical processes, chemical reaction engineering, materials design and applied catalysis. I have been exploring energy-efficient processes, technologies, and catalysts for energy conversion and nutrients recycling of sewage sludge, sustainable disposal of municipal solid wastes, biorefinery of biomass wastes, and technology-critical elements recovery from hyperaccumulators in terms of fundamental sciences, key reaction processes, industrial applications and commercialization. I have been making innovative contributions to integrated waste valorization in terms of cleaner energy production, nutrients and critical metals recovery, and environmental pollution remediation. Our research was awarded 2015 Applied Energy Award and the relevant article has been listed as ESI highly cited paper every year thereafter. I am listed in 2020-2025 World's Top 2% Scientists by Stanford University/Elsevier.