Equilibrium studies of copper ion adsorption onto modified kernel of date (Fructus dactylus)

Abstract

Heavy metal pollution of water is a serious problem because of its toxic effects on the human health and living organism. Therefore, there is a need to develop technologies to remove toxic pollutants found in polluted water. There are different ways to remove the toxic metals from wastewater. Among all treatments proposed, the adsorption process is one of the most promising technologies in water pollution control. Recently, numerous approaches have been studied for the development of cheaper and effective adsorbents. Many low-cost adsorbents, including natural materials, biosorbents and waste materials from industry and agriculture, have been proposed by several researchers. In this study, removal of copper from aqueous solution by using powdered and modified kernel of date (Fructus dactylus) with apocarbonic anhydrase enzyme has been investigated. The operating variables studied were contact time, initial solution pH, initial metal concentration, temperature and adsorbent dosage. The experimental investigation results showed that modified and powdered kernel of date (F. dactylus) has a high level of adsorption capacity for copper ions. The adsorption data were correlated with the Langmuir and Freundlich isotherm models. It was found that the Langmuir and Freundlich isotherms fitted well to the data. The results revealed that copper is considerably adsorbed on modified and powdered kernel of date (F. dactylus). Consequently, it is concluded that the modified and powdered kernel of date (F. dactylus) can be successfully used for the removal of the copper ions from the aqueous solutions.

Heavy metal adsorption ability of a new composite material based on starch strengthened with chemically modified cellulose

“…As can be seen, the amount of metal removed exhibited a significant increase at higher pH values; this thing could be attributed to low proton concentration which may compete 40 with ionic metals for the chelation with carbonyl and amino group moieties. With increasing of the pH, more amino groups will be less ionized and more prone to chelation with positively charged metal ions.…”

Copper‐PCL/PVP virucidal nanofibers against coronavirus produced by electrospinning technology

“…Cu 2+ ions are transition metals with chelating properties due to empty d orbitals that allow them to form coordination bonds with atoms with lone pairs such as oxygen, nitrogen, and fluorine, among others. The increase in the concentration of Cu 2+ ions in the polymer matrix affects the transmittance of the vibrational modes of the molecular carbonyl groups of the electrospun copper salt‐based composite nanofibers, suggesting chemical interaction 38,39 …”

“…The increase in the concentration of Cu 2+ ions in the polymer matrix affects the transmittance of the vibrational modes of the molecular carbonyl groups of the electrospun copper salt-based composite nanofibers, suggesting chemical interaction. 38,39 The copper amount incorporated into the nanofibers was determined by copper ions quantification using the methodology illustrated in Figure 4C, that is, calcination followed by digestion in nitric acid and detected by AAS. For the samples of 0.25, 0.75, and 1.50% copper salt-loaded virucidal composite nanofibers, the copper ions amount/sample mass were 5.50 ± 0.31, 14.00 ± 1.03, and 27.10 ± 3.00 mg g À1 , respectively (see Figure 4D).…”

Removal of copper from copper-contaminated river water and aqueous solutions using Methylobacterium extorquens modified Erzurum clayey soil

“…The high correlation coeffi cients show that both models are suitable for describing the adsorption equilibrium of copper ions. The adsorption capacity of natural and bacteria-modifi ed ECS adsorbent for the uptakes of copper is 79.37 and 93.46 mg/g, respectively (Gangoli et al 1975, Ramesh et al 2005, Demirbas et al 2008, Nadaroglu et al 2015.…”