An Alternative Method of Extracting Cu2+From Aqueous Solution Using Modified Multiwall Carbon Nanotubes

modified Multiwall carbon nanotubes that has a ultrahigh specific surface space with variety of chemically reactive functionalities, such as epoxy and hydroxyl groups on the basal plane and carboxylic acid groups along the area edge, which can be use different groups for fictionalization, consequently it has a great promise for use as sorbent materials. On the other hand silica is well-known one of the best sorbent for adsorption that we use it as substance for coated on the modified Multiwall carbon nanotubes for produce an ultra-sensitive sorbent. A new technique using a solid phase extraction (SPE) cartridge with modified Multiwall carbon nanotubes by silica as sorbent was developed for the pre concentration of trace amounts of copper and was determined by flame atomic absorption spectrometry (FAAS). Some of the important parameters were selected and optimized. Under the optimized conditions the limit of detection (LOD) and limit of quantification (LOQ) were 0.235, 0.765 and the proposed method has a good reproducibility 2.05% (RSD %). The enrichment factor was 200 and the percentage of recovery was in the range of 97-100% .The method was successfully applied to the recovery of Cu2+ in different type of water samples. Modified Multiwall carbon nanotubes and its derivates such as MCNT@SiO2 in this study is full of potential to use as an excellent adsorbent in the extraction method like solid phase extraction (SPE).

Keywords: Multiwall carbon nanotubes; Silica; SPE; Preconcentration; FAAS; Copper.