Determination of Pb and Ni in Natural Water Samples after Solid Phase Extraction with Layered Double Hydroxide (LDH) Nano-Particles

Abstract

Due to the industrialization, especially in the developing countries, the emission of the heavy metals as lead, cadmium, chromium, nickel, arsenic, and mercury are highly concerned to public and aquatic health. Lead is released with the effluent from the paint, batteries, and automobiles manufacturing units. Lead is one of the toxic metals and largely affects the central, peripheral nervous system. In this study, a suitable and reliable method for the direct determination of Pb and Ni ions in environmental water is proposed. Pb and Ni ions were extracted and precocentrated with layered double hydroxides (LDHs) nano-particles. LDHs, relatively inexpensive and simply prepared material, was synthesized and used as a solid phase extraction (SPE) adsorbent to quantitatively determine the concentration of Pb and Ni ions in natural water samples. Several factors affecting the extraction efficiency, such as, eluent type, eluent volume, flow rate of sample, sample volume, and amount of adsorbent, were investigated and optimized in detail. Pb and Ni ions can be quantitatively retained by LDH nano-particles, then eluted completely by 1 mL of CO 3 2-(1.5 mol L-1) and1mL EtOH (65% v/v), respectively. The detection limit of this method for Pb and Ni ions was 17 ng mL−1with an enrichment factor of 100, and the relative standard deviation (RSD) was 1.4%.

Controlled release of organic–inorganic nanohybrid:cefadroxil intercalated Zn–Al-layered double hydroxide

“…7,8 As an important class of inorganic layered nanomaterials, clays have been widely studied as active molecular ion delivery vehicles which can be either cationic with negatively charged aluminosilicate layers or anionic with positively charged hydroxide layers. 8,9 Layered double hydroxide (LDH) is a synthetic analog of naturally occurring mineral hydrotalcite 10 and has contributed to the development of drug delivery applications due to its advantages such as anion exchange properties, 11 low cytotoxicity, simple preparation, 12 biocompatibility and biodegradability properties, 13 basicity of the matrix, 14 and low cost. 15 It also leads to the achievement of the following: (i) stabilization of the drugs, 16 (ii) improving both their solubility and cellular uptake, 15,17 and (iii) controllably releasing them.…”