The efficiency of Fe@Mg-Al layered double hydroxide for cadmium removal from water samples

Abstract

The fast development of the population and industrialization cause many environmental problems due to the increase of carcinogenic compounds and heavy metals in the environment. In this regard, many studies have been conducted to remove these compounds from the water, air, and soil. The Layered double hydroxide is one of the adsorbents which have attracted great attention in recent years owing to its ease of preparation, costeffectiveness, environmental compatibility, and non-toxicity. Consequently, in this study, magnetic nanoparticles of Fe@Mg-Al layered double hydroxide have been modified with ammonium pyrrolidine dithiocarbamate (APDC) and then used as an adsorbent to form a complex with cadmium ions and removing them. Based on the absorption properties of synthesized magnetic nanoparticles, an easy, practical, economical and repeatable method has been developed to remove contaminants from water, including heavy metal ions. Cadmium ion has been studied by floating in an aqueous medium by these nanoparticles. Also, the optimal values of effective factors such as pH, amount of magnetic nanoparticles, contact time, temperature and sample volume and ligand concentration were 7, 0.045 g, 30 min, 35 ˚C, 25 mL and 1.7 mg L-1 , respectively. The isotherm equations have been also investigated to evaluate the absorption quality. The thermodynamic parameters as well as the effects of interfering ions have been investigated as well. A flame atomic absorption spectrometer (FAAS) has been applied to detect Cd ions.

An alternative method of dispersive solid‐phase extracting Hg (II) from environmental aqueous solutions using carboxylic functionalized carbon nanotubes

“…In recent years, the application of the nanosorbents such as activated carbon, Various methods, co-extractant ligands has been attracted considerable consideration [11,[13][14][15][16]. However, the avail of classical extraction procedures which is usually for the extraction and preconcentration of mercury ions has been suggested including liquid chromatography [17,18], aggregate film formation [19], supercritical fluid extraction [20], flotation, liquid membrane [21], column sorption of pyrocatechol violet-Hg complexes onto activated carbon, ion-pairing, separation with yeast, and solid-phase extraction applying C 18 cartridges and disks [22][23][24]. Today, technology in the development of polymers is considered as one of the fascinating scientific fields, so that researchers have made many applications of polymers in the field of drug delivery, absorption of pollutants, diagnostic methods of diseases and the manufacture of additives [25][26][27][28].…”

Preparation of modified multiwalled carbon nanotubes (l-Arg-CS/MWCNTs-COOH/Fe3O4) as sorbent for dispersive solid phase extraction of Cu(II), Pb(II) and Cd(II) in wastewater samples

“…where Ci is the initial concentration of metal ion in mg L -1 and Cf is metal ion concentration (mg L -1 ) after adsorption. 9,27 RESULTS AND DISCUSSION 1. Characterization…”

“…In Fe3O4/MWCNTs-COOH spectrum, the stretching vibrations at 3435 cm −1 , 2919 cm −1 , 1575 cm −1 , 1113 cm -1 and 574 cm -1 can be related to the stretching vibration of hydroxyl, aliphatic O __ H, C __ H, __ C __ O, C ̳ ̳ ̳ O and Fe __ O, respectively. [24][25][26][27][28][29] In l-Arg-CS spectrum, peaks in areas 1520 cm −1 and 1302cm −1 may be related to asymmetry and symmetry stretching vibration of __ COO __ in l-Arg. The peak at 1073 cm −1 assigned to the stretching vibration of __ C __ N. In fact, it was the reaction between __ Cl and __ NH2.…”