Heavy metal containing nano-sludge could be origin not only from industrial solid wastes, but also from the process when we treating heavy metal containing wastewater via using nanomaterials. The existing state of nanophases in such sludge are very complex, however, it could be grossly divided into two catalogues, 1)harmless nanophases surrounded(either via adsorption or precipitation) by harmful heavy metals, 2 ) the nanophases are formed by harmful heavy metal compound directly. Through applying nanocrystal growth kinetics, we have been contributing a number of innovative efforts to achieve the targets of ‘‘recyclable use’’ of heavy metals via manipulate the crystal state of nanophases. For the first kind of situation, we use interfacial agents to induce rapid crystal growth or reduce lattice defects of the nanophase. The decrease of lattice defects and specific surface area of the harmful phase could facilitate the desorption of heavy metals from the crystal surface or interlayer. For sludge containing several kinds of nanosized heavy metal compounds, we studied the interfacial agents which could realize the selective growth of specific nanophase. Through selective regulation, the goal of recovery of different heavy metal from nanowaste could be achieved.

Recycling of heavy metal from nano-sludge via crystal growth manipulation

256th National Meeting (2018)

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