Fabrication of weakly basic-functionalized poly (Styrene Co-Maleic Anhydride) hyper-cross-linked resins for the efficient adsorption organic acid

Abstract

Abstract Herein, four hyper-cross-linked amide resins (DMDs) were synthesized by suspension polymerization and amination reaction. In the process of suspension polymerization, divinylbenzene (DVB) and maleic anhydride (MAH) with different feed ratios generated resins (DMHs) with different pore structures. After N, N'-dimethyl-1,3-propanediamine (DMAPA) chemical functionalization of DMH, the weak base exchange capacity of the product resins significantly increased, with the values of 1.01 mmol/g (DMD1), 1.15 mmol/g (DMD2), 1.22 mmol/g (DMD3), and 1.34 mmol/g (DMD4). Salicylic acid (SA), benzoic acid (BA), gallic acid (GA), and phenol (PHE) were utilized as the adsorbates to investigate batch adsorption. At 288 K, the maximum capacity (qmax) of SA, BA, and GA on the DMD4 were 181.7 mg/g, 143.8 mg/g, and 145.2 mg/g, respectively. The adsorption of BA and GA attained the equilibrium within 100 min, and the kinetic data can be described by the pseudo-second-order (PSO) rate model. This universal synthetic method is of great importance for the fabrication of some other functionalized hyper-cross-linked polymers, and this strategy was universal for the weakly basic functionalization of some other resins.