Removal of phenolic compounds from a raw industrial wastewater from phenolic resin processing, of which the components are phenol (8.9 wt%), m-and p-cresols (0.33 wt%), and xylenols (0.044 wt%), was carried out by using crosslinked cyclodextrin particles as a sorbent. A series of sorbents was prepared by varying the combination of cyclodextrin (CyD), β-CyD, γ -CyD, Mix-CyD (α-CyD:β-CyD:γ -CyD:dextrin = 30:10:10:50 wt/wt), the crosslinker, hexamethylene diisocyanate (HDI) or toluene-2,6-diisocyanate, and their molar ratio in the reaction batch. The removal of the phenolic compounds from raw industrial wastewater was an instantaneous process and was completed within about 5 min. The best removal efficiency was obtained by the crosslinked β-CyD with HDI in a 1:8 molar ratio or the crosslinked Mix-CyD with HDI, also in a 1:8 molar ratio. The prepared sorbents were efficiently regenerated by elution of the adsorbed phenols from the crosslinked polymers with methanol.

BACKGROUND: Phenols are commonly encountered in aqueous effluents from various manufacturing processes such as oil refineries, coke plants, and phenolic resin plants, and are toxic substances that should be removed from the aquatic environment. We describe the preparation of beaded crosslinked β-CyD polymers, and the removal of phenol from raw industrial wastewater discarded from phenolic resin processing by the obtained β-CyD adsorbent.

Chemical-modified pulps were synthesized from four types of waste pulps (Pulp1-4) and succinic anhydride (SAn) or maleic anhydride (MAn). The solubility of the modified pulps was evaluated in common organic solvents, and their thermal properties were investigated by DSC measurement. The solubility of the modified pulps increased with an increasing degree of substitution (DS). However, no T g or T m of these modified pulps was confirmed. Pulps and modified pulps were graft-polymerized with -caprolactone (CL) in bulk and in DMAc/LiCl. Although the solubility of the graft copolymers was similar to modified pulps, some graft copolymers showed a T g by the introduction of CL units. In the bulk, graft copolymers obtained from modified pulps and nonmodified pulps showed a T g of about 75°C and no T g , respectively. In DMAc/LiCl, the obtained graft copolymers from both modified and nonmodified pulps exhibited a T g of 95-110°C.

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Terpolymers having phospholipid polar groups were synthesized from 2-methacryloyloxyethyl phosphorylcholine (MPC), methacryloyl or acryloyl poly(oxyethylene) macromonomers (POEM) [(CH 2 CH 2 O) n (where n ϭ 2-23); PEOM(2), PEOM(23), ME(9), Ph(6)], and n-butyl methacrylate (BMA). The characteristics of these terpolymer membranes were investigated by water content (H) and X-ray photoelectron spectroscopy. The content of water in the terpolymer increased with increasing content of MPC and length of oxyethylene units. The membranes of terpolymers were found to adsorb bovine serum albumin much less than those of poly(methyl methacrylate) and poly(BMA). Even though the contents of MPC in the terpolymer were 5 to 25 mol %, the terpolymer depressed BSA adsorption more than poly(MPC-co-BMA) consisting of 29 mol % of MPC. The use of terpolymer with POEM can decrease the amount of MPC in the polymer.