Synthesis of Negatively Charged Polyol-Functional PSF Membranes with Good Hydrophilic and Efficient Boron Removal Properties

Abstract

Boron removal remains a major barrier to water purification, it is important to develop a specialized adsorption membrane for boron removal. By means of a simple and effective method, a hydrophilic membrane for boron removal with a polyhydroxy functional group on the surface was prepared. Firstly, a polysulfone (PSF) membrane was modified by co-depositing polyethyleneimine (PEI) with dopamine (DA) in one-step to produce amine-rich surfaces, then the DA/PEI-functionalized membranes were reacted with glycidol, with the prepared membranes corresponding to PSF-PDA/PEI membranes and PSF-diol membranes. The prepared membranes were characterized by water-uptake, FTIR, (X-ray photoelectron spectroscopy) XPS, (Field emission scanning electron microscope) FESEM, and zeta potential measurements. The hydrophilicity of the membrane was characterized by the static water contact angle (WCA) test. In addition, we systematically studied the impact of initial boron concentration, chelating time, and pH value on boron removal performance. The results showed that the PSF-diol membrane had strong hydrophilicity with a WCA of about 38°. The maximum adsorption capacity of boron appeared to be 1.61 mmol/g within 10 min at a boron concentration of 300 mg/L. Adsorption kinetics showed that saturation adsorption can be achieved in minutes at the initial concentration of 5 mg/L, which is beneficial to a rapid filtration process.

Chromatin extracted from common carp testis as an economical and easily available adsorbent for ethidium bromide decontamination

“…To explore the mechanism of adsorption reaction, adsorption kinetics, including the Pseudo-first-order kinetics model and Pseudo-second-order kinetics model, was investigated. The Pseudo-first-order model equation is as follows [ 35 ]: where q e is the adsorption amount of adsorbent at equilibrium (mg·g −1 ), q t is the adsorption amount of adsorbent at any time (mg·g −1 ), and k 1 is the kinetic adsorption rate constant at the pseudo-first-order (min −1 ). The Pseudo-second-order model equation is as follows [ 36 ]: where k 2 is the kinetic adsorption rate constant at the Pseudo-first-order (g·mg −1 ·min −1 ).…”

Characterization of Mussel Inspired Surface Modified and Metal Chelated Polymer Membrane

“…Membrane holes blockage by the coating compound was causing the decrease of water flux through the membrane. The reaction between dopamine and PEI enhances the stability of the coating of membrane surface, which signifies the success of PDA/PEI coating on the surface of PVDF membrane [19]. Fig.…”

“…After incorporating PEI on the membrane, the surface hydrophilicity of the modified membranes further improved showing a static contact angle reduced to an average of 53.60° [19]. High amount of amino groups in PEI improves the hydrophilicity significantly, and the crosslinking reaction between PDA and PEI speed up the deposition process.…”

Surface-Induced ARGET ATRP for Silicon Nanoparticles with Fluorescent Polymer Brushes

“…Polymer/silica nanoparticles (polymer/SNPs) hybrid materials combine the advantages of SNPs (thermal stability, rigidity, ease of modification) and polymers (ductility, functionality, machinability, compatibility) [1,2,3]. A variety of methods have been developed for preparation polymer/SNPs hybrid nanoparticles, including the in-situ introduction or adsorption of nanoparticles [4], the sol-gel technique [5,6], layer-by-layer deposition [7] and graft polymerization [8,9].…”