Reply to Comments by S. Azizian on J. Chem. Eng. Data 2007, 52, 1615−1620

Chemically modified organic/inorganic nanoporous composite particles for the adsorption of reactive black 5 from aqueous solution

“…Maximum adsorption capacity and equilibrium adsorption time (454.54 mg/g, 60 min, respectively) were compared with the some other adsorbents for RB5 presented in Table 5 [43,50,[58][59][60][61][62][63]. Although the adsorption capacity of some of the adsorbents like polyethyleneimine grafted on Chitosan beads (709.27 mg/g, [43]) and glycidyl methacrylate resin modified with tetraethelenepentamine (624 mg/g, [60]) is higher than that for CMCA, in contrast, their equilibrium time required for the adsorption (8 and 3 h, respectively) is relatively higher.…”

Feldspar/titanium dioxide/chitosan as a biophotocatalyst hybrid for the removal of organic dyes from aquatic phases

“…Δ G o is used to distinguish the spontaneity of the adsorption process; the higher the negative value of Δ G o is, the more energetically favorable the adsorption process will be. Δ G o for AB1 had a negative sign at 25°C (with dye concentrations of 30, 50, and 70, Δ G o = −0.25, −0.36, and −0.33 kJ/mol, respectively); this means that the AB1 adsorption by feldspar/TiO 2 /CTS was spontaneous and could be considered as physisorption . On the contrary, the positive signs of Δ G o at 35 and 45°C suggest the presence of an energy barrier at higher temperatures in the adsorption, and therefore, adsorption was not spontaneous at these temperatures .…”

“…Δ G o for AB1 had a negative sign at 25°C (with dye concentrations of 30, 50, and 70, Δ G o = −0.25, −0.36, and −0.33 kJ/mol, respectively); this means that the AB1 adsorption by feldspar/TiO 2 /CTS was spontaneous and could be considered as physisorption . On the contrary, the positive signs of Δ G o at 35 and 45°C suggest the presence of an energy barrier at higher temperatures in the adsorption, and therefore, adsorption was not spontaneous at these temperatures . Negative values of Δ H o reveal that the adsorption process is exothermic and was less favorable at higher temperatures.…”

“…Thermodynamic parameters, such as the free energy change (Δ G o ), enthalpy change (Δ H o ), and entropy change (Δ S o ), were estimated . The obtained thermodynamic values are summarized in Table .…”

Adsorption of acid red 114 and reactive black 5 in aqueous solutions on dendrimer‐conjugated magnetic nanoparticles

“…[59] The calculated isotherm parameters of two anionic dyes from both models are shown in Table 2. [60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79] Though Fe 3 O 4 @SiO 2 -TRIS has a large number of terminal hydroxyl groups, their maximum dye binding capacity is less than that of Fe 3 O 4 @SiO 2 -MPAP [41] and Fe 3 O 4 @SiO 2 -NH 2. It indicates that the adsorption occurs at specific homogeneous sites within the adsorbent, forming a monolayer coating of the dye at the surface of the adsorbent.…”