Abstract:

We prepared Ni/Al layered double hydroxide (LDH) nanoparticles by nonsteady coprecipitation. Water heat treatment process accelerated the crystal of amorphous precipitation. We acquired stable hexagonal sheet Ni/Al LDH nanoparticle colloidal suspensions. We controlled the shape and size of Ni/Al LDH nanoparticles by adjusting peptization temperature and time. We further obtained the optimal peptization temperature of 130 ℃ and peptization time of 24 h for the preparation of Ni/Al LDH nanoparticles. Ni/Al LDH nanoparticles have better adsorption property because of their unique properties of net positive charge and structure and can be manufacured as a solid phase extraction adsorbent. This realizes the combination of nanocomposites with sample pretreatment technology and optimizes sample preprocessing technology.

Key words: solid phase extraction adsorbent, layered double hydroxides(LDHs), nonsteady coprecipitation, peptization