Modification of silica gel by attachment of 2-mercaptobenzimidazole for use in removing Hg(II) from aqueous media: A thermodynamic approach

Synthesis, Characterization and Thermal Properties of Silsesquioxane Organically Modified With 4,5-Diphenyl-2-Imidazolethiol

“…When this occurs a new peak appears, as described above (NCH 2 ). These values are similar to those described in the literature (Prado, Sales, Carvalho, Rubim, & Airoldi, 2004;Alcântara et al, 2007) for analogous compounds supported on silica -based materials. For comparison purpose, Figure 6 shows the 13 C solid state NMR of DIT, where exactly were observed 4 resonance peaks.…”

Hexagonal mesoporous silica modified with copper phthalocyanine as a photocatalyst for pesticide 2,4-dichlorophenoxiacetic acid degradation

“…(3) an intense band related to the υ as (Si-O-Si) asymmetric stretching at 1068 cm −1 ; (4) a shoulder band assigned to the Si-OH bending frequency at 964 cm −1 ; (5) the υ(N-C=N) stretching was confirmed by a band at 1618 cm −1 ; (6) a weak peak at 1500 cm −1 assigned to the υ(-N=) stretching, (7) the υ(-C=C-N=) stretching at 1320 cm −1 , (8) a peak at 798 cm −1 assigned to the bending of a secondary amine (-NH) [23,24]. These peaks confirm that the CuF 16 Pc molecule is attached on the silica surface by covalent bonds.…”

Thermodynamic aspects of the Pb adsorption using Brazilian sawdust samples: Removal of metal ions from battery industry wastewater

“…Following each addition, the constant heat flux ( tit Q) was recorded at the end of the operation, and the mixture allowed to re-equilibrate. A similar procedure was used to monitor the heat flux due to metal dilution ( dil Q) in the absence of sawdust and also the heat flux of solvation of the suspended sawdust ( sol Q) [21].…”

“…In 1784, Lavoisier and Laplace developed an ice calorimeter in order to determine the calorific capacity of materials, heat of reaction, of metabolic heat by applying the formula for the latent heat of melting water obtained by this ice calorimeter, once there were not accurate thermometers, thermistors or thermopiles to determine small energetic changes [21,22]. Since the development of technology of calorimeters, small energy values have been determined, and nowadays, it is possible to identify and quantify many phenomena of the distinct processes in colloidal systems in solid/liquid interfaces such as: energy distribution of the surface, adhesion energy, enthalpy of dilution, aggregation/micellization enthalpy, as well as, interaction between contaminant adsorbate molecules and the adsorbent [23].…”