Adsorptive Removal of Cu(II) Ions from Aqueous Media onto 4-Ethyl Thiosemicarbazide Intercalated Organophilic Calcined Hydrotalcite

Abstract

This paper describes the adsorption properties of Cu(II) ions from aqueous media by 4-ethyl thiosemicarbazide (ETSC) intercalated organophilic calcined hydrotalcite (OHTC). Elemental analysis, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric–differential thermogravimetric (TG/DTG) studies have helped in characterizing the adsorbent. The effects of various factors like adsorbent dose, pH, initial concentration, and contact time were studied. The pH study indicated that Cu(II) has a good adsorption potential at pH 5.5. The adsorption of metal ion remained constant after 4 h. The pseudo-second-order model was the best fit to describe the adsorption kinetics. The FTIR spectroscopy revealed that both amino and thiocarbonyl groups in ETSC–OHTC are responsible for Cu(II) removal. The Freundlich model described the adsorption results very well, and the K F value was found to be 21.38 at 303 K. Electroplating industry wastewater was used to test the adsorption efficiency toward Cu(II) removal. The recovery (∼95.0 %) of Cu(II) ion from the loaded adsorbent was possible with 0.01 mol·kg–1 HCl solutions. Many successive adsorption/desorption cycles were achieved without any noticeable change in the adsorption capacity.

Preparation and Characterization of Thiosemicarbazones Corrosion Inhibition Effect and the Antimicrobial and Anticancer Effect on their Metal Complexes

“…o C due to loss of C=S NHNH with weight loss of 28.1% followed by further decomposition. The results of the thermogravimetric analysis of the metal complexes under study Table 4 shows that the complexes lost their lattice water only or with NH 3 and CH 3 below 200 o C. The anhydrous complexes lost the chloride moiety at the temperature above 200 o C and then displayed the decomposition of the organic ligand within the temperature range from 400-800 o C leading to the formation of the metal oxides (Lever, 1984).…”

“…MLCl x .nH 2 O → [MLCl] → ML ML → MO 2 The first step with TGA peak in the o C range represented the loss of the lattice water molecule only or with NH 3 and CH 3 . In most complexes, an endothermic peak occurs due to the loss of chloride moieties from the metal complexes.…”

“…These compounds were formed by the condensation of thiosemicarbazide and aldehyde or ketone, and it is not surprising that numerous thiosemicarbazone complexes have been prepared and characterized (Kashar & Emran, 2016). However, various studies of thiosemicarbazone derivatives include; investigations of corrosion inhibitors for metal alloy (Arab & Emran, 2008), fluorometry, atomic absorption spectrophotometry, and chemical sensors (Yadav et al, 2013), supramolecular chemistry (Anirudhan et al, 2013), optoelectronics (Garg & Jain, 1988), and pharmacological activity (Khanye et al, 2011). Benzofuran, naphthofuran, and their derivatives have received considerable attention due to their occurrence in nature (Lumb & Trauner, 2005;Akyul & Anil, 2004).…”

Highly Efficient Adsorption of Copper Ions by a PVP-Reduced Graphene Oxide Based on a New Adsorptions Mechanism

“…Tracing amounts of some metal ions such as copper, zinc, iron and cobalt is required by organisms as cofactors with enzymatic activities. However, the excess of the heavy metal ions will cause serious potential problems on living organisms due to their high toxicity, carcinogenic and bioaccumulation [2]. The content of The World Health Organization (WHO) recommended the maximum acceptable concentration of Cu ions in drinking water is 1.5 mg/L [2].…”

“…However, the excess of the heavy metal ions will cause serious potential problems on living organisms due to their high toxicity, carcinogenic and bioaccumulation [2]. The content of The World Health Organization (WHO) recommended the maximum acceptable concentration of Cu ions in drinking water is 1.5 mg/L [2]. Lots of treatment methods (such as chemical precipitation, ion exchange, electrolysis, reverse osmosis, adsorption, etc.)…”