Grafting of Poly(4-vinylpyridine) onto a Macroporous Resin for Sorption of 2-Naphthalenesulfonic Acid in Batch Experiments

Abstract

In the current work, poly(4-vinylpyridine) (P4VP) was grafted on a macroporous polystyrene resin via free-radical polymerization by using the pendent vinyl group. The grafting conditions such as swelling agent, initiator concentration, reaction temperature, and amount of 4vinylpyridine (4VP) monomer were optimized, and three resins with different 4VP monomer amounts (SC-1, SC-2, and SC-3) were chosen as adsorbents. P4VP-grafted resins were characterized by scanning electron microscopy, N 2 sorption/desorption isotherms, Fourier transform infrared, and X-ray photoelectron spectroscopy. The sorption properties of 2naphthalenesulfonic acid (NSA) on three resins were comparatively investigated. The experimental data revealed that the sorption process on three resins fitted well with the pseudo-second-order kinetics equation, and the equilibrium isotherms were in good agreement with the Langmuir model. The NSA sorption onto resins was an endothermic and spontaneous process, and SC-3 loaded with NSA can be efficiently regenerated by NaOH and ethanol mixed solution after sorption. The maximum sorption capacities of three resins indicated that P4VP-grafted resins possess good sorption ability toward NSA.

Pyridine‐Rich Novolac‐Based Network as an Effective Adsorbent for Removing Azo Dyes

“…Dye (anionic) adsorption at basic pH, clearly, is quite significant for the present material. Presumably, pyridine moieties induce complex process of interactions with dye molecules in combination with other interacting groups (amino, hydroxy and ether functionalities) of the network . In the acidic (pH=2.30) to nearly neutral region (pH=7.20) the pyridine units in combination with other motifs of the sorbent are responsible for azo dye adsorption.…”

“…In the acidic (pH=2.30) to nearly neutral region (pH=7.20) the pyridine units in combination with other motifs of the sorbent are responsible for azo dye adsorption. At lower pH, the sorbent surface becomes positively charged due to the protonation of pyridine nitrogen (pH < 4.0) favoring both electrostatic and hydrogen bonding interactions with sulphonate groups(−SO 3 − ) of azo dye molecules as illustrated in Figure . Also other motifs of the sorbent get involved in hydrogen bonding interactions (N−H− − O 3 S− and −O−H− − O 3 S−).…”

Fabrication of weakly basic-functionalized poly(styrene-co-maleic anhydride) hyper-cross-linked resins for the efficient adsorption of organic acid

“…HCP-90, as the optimal resin, had the largest S BET (742 m 2 /g), the smallest micropore volume (V micro , 0.07 cm 3 /g), and the best adsorption performance (q max , 777.9 mg/g). Sun et al [15] chose the macroporous polystyrene adsorbent NG-8 as a substrate and used 4-vinylpyridine (4VP) monomers to modify the vinyl suspended on the adsorbent by graft polymerization, resulting in the adsorption capacity for 2-naphthalenesulfonic acid (NSA) up to 1014 mg/g, which made the removal of aromatic sulfonic acids from wastewater promising. Cao et al [16] synthesized the HCPs with an excellent adsorption effect on phenol by inserting acetanilide into the polymer skeleton of CMPS through two consecutive Friedel-Crafts alkylation reactions.…”