Adsorption of Metal Ions on an Activated Carbon/L‐Lysine Derivative Hybrid Compound

Abstract

The new compound N ε -(4-amino-1,6-dihydro-1-methyl-5-nitroso-6-oxopyrimidin-2-yl)-L-lysine (H 2 L) has been synthesised and its molecular structure determined by single-crystal X-ray diffraction methods. The Brönsted acid/base character of H 2 L has been determined in water in the pH range 2.5-10.0, and the nature of the observed protonation steps determined by potentiometric and spectrophotometric methods. The adsorption of H 2 L on a commercial activated carbon (AC) in aqueous solution is irreversible, mainly due to the electronic behaviour of the π system of the pyrimidine moiety. The adsorption of H 2 L on the AC provides a route to develop NH 3 + -CHR-COO --type functions on the AC surface,

Preparation and characterization of trihydroxamic acid functionalized carbon materials for the removal of Cu(II) ions from aqueous solution

“…2c). These changes are similar to those reported for analogous 5-nitroso pyrimidine receptors [25,26,38,48]. Thus, this protonation is assigned to the C(5)NO chromophore of the pyrimidine moiety.…”

“…For this reason, the control of the surface chemical functionalization of ACs without changing their textural properties [23] becomes a main objective in order to obtain efficient and selective carbon materials for metal ion recovery. We have reported a functionalization method of carbon materials [24][25][26][27][28][29][30] materials [31]. The procedure results in carbon/receptor hybrid materials.…”

New hybrid materials based on the grafting of Pd(ii)-amino complexes on the graphitic surface of AC: preparation, structures and catalytic properties

“…The first one consisted on the preparation of Merck/Lys and Merck/Tren hybrid materials, which was done following previously described procedures. 12,15 The amounts of the receptors adsorbed were 0.71 mmol/g, in the case of Lys, and 0.43 mmol/g in the case of Tren. …”

“…12,14,15,17 The adsorption-desorption isotherms of N 2 on both hybrid materials together with these of Merck are shown in Figure 1. The pore size distributions obtained from the isotherms are collected in Figure 2.…”

“…14 Thus, once the Ar-S-F molecules are adsorbed into open pores the subsequent adsorption of metal ions by the hybrid materials AC/Ar-S-F is mainly controlled via complexation of the metal ion by the F function (Scheme 1). 12,13,[15][16][17] This provides a suitable strategy to prepare solid catalysts based on the catalytic properties of metal-ion complexes supported on the graphene surface of the AC. This method catalyst preparation has two important advantages: i) it allows the exhaustive control of the amount of active sites on the surface of the hybrid material and ii) the textural and chemical functions of the starting AC remain unaltered in the hybrid due to the soft conditions of preparation.…”