Synthesis of novel methacrylate based adsorbents and their sorptive properties towards p-nitrophenol from aqueous solutions

Removal of p-Nitrophenol from Aqueous Solution Using Brazilian Peat: Kinetic and Thermodynamic Studies

“…The temperature variation caused a decrease in the adsorption capacity, mainly from 25 to 35°C. The same trend was found in a study by Erdem et al (2009), in which the decay of adsorption capacity was triggered because of the exothermic nature of the process.…”

“…According to the observed absorbance values, the adsorption of PNP into peat is not significant at acidic pH values (1-6) (10.20-25.52 %), because an ion-dipole interaction occurs between the peat and PNP, whereas hydrogen bonds occur between the hydroxyl group of PNP and the carboxyl groups present in the peat (Nourmohammadian et al 2007). At pH values of 8-9, there was increased removal of PNP (40.58-56.76 %), which may be attributed to the exchange of electrons between peat and p-nitrophenolate ions (Erdem et al 2009). At pH values of 10-11, the results were not affected by the presence of peat, because the p-nitrophenolate ions were not densely embedded in the surface of the peat, causing an electrostatic repulsion (Chang et al 2009).…”

“…where q e1 (mg g −1 ) represents the amount of PNP adsorbed at equilibrium, as calculated by the pseudofirst-order equation, k 1 (min −1 ) is the adsorption rate constant for the pseudo-first-order reaction and t (min) is the time interval (Chang et al 2009;Erdem et al 2009;Li et al 2009;Iram et al 2010). According to Eq.…”

“…where q e2 (mg g −1 ) is the amount of PNP adsorbed at equilibrium, as calculated by the pseudo-secondorder equation, and k 2 (g mg −1 min −1 ) is the adsorption rate constant for the pseudo-second-order reaction (Chang et al 2009;Erdem et al 2009). The constants k 2 and q e2 can be calculated from the straight line plot of t/q t versus t. The values of the kinetic parameters for PNP removal using peat are shown in Table 1.…”

Design, synthesis and characterization of MOF-199 and ZIF-8: Applications in the adsorption of phenols derivatives in aqueous solution

“…Among them it is worth mentioning cases reported in the literature such as adsorption [4][5][6][7][8][9][10][11][12][13][14][15]26], oxidation [19][20][21][22][23][24][25][26][27][28][29], membrane separation [20][21][22][23][24][25][26], and extraction [24][25][26][27][28][29]. Among these technologies, adsorption is recognized as the most applicable one for single-design, easy-operation, and highefficiency [18,[25][26][27] and in the adsorption process, activated carbon is popularly employed as adsorbent for its large specific surface area and high adsorption capacity [1,3,4,8,17,28]. Even though activated carbon material is considered one of the best materials to solve environmental pollution problems, it ...…”