Adsorption behavior, thermodynamics, and mechanism of phenol on polymeric adsorbents with amide group in cyclohexane

Effective removal of methylene blue from aqueous solution using a new magnetic iron oxide nanosorbent prepared by combustion synthesis

“…9 Schematic illustration of one MB adsorption-desorption cycle using MnP as the adsorbent. 1-250 mL MB solution of 50 mg L -1 initial concentration, 2 g L -1 adsorbent dose; 2-dye solution after adsorption; 3-Magnetic separation of the MnP adsorbent; 4-separation of the adsorbent loaded with MB; 5-50 mL ethanol solution (anhydrous alcohol: water = 1:1) added over MnP loaded with MB; 6-eluent after desorption; 7-magnetic separation of the MnP adsorbent; 8-separated adsorbent, washed with distilled water and dried at 70°C for 1 h, ready to be reused for adsorption in the next cycle Effective removal of methylene blue from aqueous solution using a new magnetic iron oxide… molecules (Huang et al 2007). The linear form of the Freundlich isotherm is expressed as follows (Lin and Juang 2009):…”

Adsorption behaviors of three polymeric adsorbents with amide groups for phenol in aqueous solution

“…Synthesis of the three adsorbents (PMVBA, PMVBC, and PMVBU) was described elsewhere [1]. Prior to use, the adsorbents were first rinsed with 0.1 mol/L of sodium hydroxide followed with deionized water until neutral pH.…”

“…For binding calculations, N,N-dimethylacetamide, N-methylurea, and N,N -dimethylurea were employed as the small molecular analogues in place of the solid polymeric adsorbents PMVBA and PMVBU. Previous studies indicated that the amide groups of N,N-dimethylacetamide, N-methylurea, and N,N -dimethylurea can provide reasonable analogues to the hydrogen bonding acceptors for PMVBA and PMVBU [1,17,18]. The hydrogen bonding bond length, bond angle, dihedral angel of the plane between the molecular analogue and phenol, and bond energy were determined from the optimized structures of the admixture.…”

“…In our earlier paper [1], three polymeric adsorbents with amide groups capable of forming hydrogen bonding with phenol, macroporous crosslinked poly(N-methyl-N-p-vinylbenzylacetamide) (PMVBA), poly(N-methyl-N-p-vinylbenzylcaprolactam) (PMVBC), and poly(N-methyl-N-p-vinylbenzylurea) (PMVBU), were prepared successfully and their adsorption properties for phenol in cyclohexane were discussed. It was shown that phenol adsorbed onto the three adsorbents was efficient, and hydrogen bonding was the main adsorption mechanism.…”

Surface chemical modification on hyper-cross-linked resin by hydrophilic carbonyl and hydroxyl groups to be employed as a polymeric adsorbent for adsorption of p-aminobenzoic acid from aqueous solution

“…Many literatures reported the synthesis of resins based on hydrogen bonding [23][24][25], and adsorption mechanism on basis of hydrogen bonding is usually clarified by thermodynamic or theoretical calculation [26][27][28]. To the best of our knowledge, direct evidence to testify hydrogen bonding between the resin and the adsorbate is little discussed [29].…”