Recent advances in nanoscale-metal assisted biochar derived from waste biomass used for heavy metals removal

摘要

Highlights?Novel synthesis methods of nanoscale-metal assisted BC are described.?Nanoscale metals can improve the surface properties and active sites of BC.?The effect of environmental factors on HMs removal with BC composites is discussed.?Evaluation of operation strategies and scale-up system is presented.?Future prospects of the nanoscale-metal assisted BC are proposed.AbstractPollution of heavy metals (HMs) is a detrimental treat to human health and need to be cleaned up in a proper way. Biochar (BC), a low-cost and “green” adsorbent, has attracted significant attention due to its considerable HMs removal capacity. In particular, nano-metals have recently been used to assist BC in improving its reactivity, surface texture and magnetism. Synthesis methods and metal precursors greatly influence the properties