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.
Highlights
Boron is one of the essential trace elements for plants and animals [1]
A certain mass of PSF-diol membrane was cleaned with methanol, and the membrane was put into a solution with a known boron concentration, followed by a shock adsorption reaction for 3 h
When the and the adsorption platform appeared, this is because the surface of the PSF-diol membrane has initial concentration was 300 mg/L, the maximum adsorption capacity appeared to be 1.61 mmol/g, a large number of ortho-hydroxyl groups that can be complexed with boric acid
Summary
Boron is one of the essential trace elements for plants and animals [1]. Appropriate boron can promote the transport of plant carbohydrates, regulate the synthesis of sugars, and promote cell division [2,3]. Because of the low boron content, small radius, low electro-negativity, and other special properties, boron removal technology remains a technical problem [11,12]. Polyhydroxy structure has been membrane for boron removal. Polyhydroxy structure has been proved to have effective complexation proved to have effective with boron [16,17].and. Hyperbranched-polyol-tethered membranes were conditions proved to are be membranes were proved to be highly effective and fast adsorbent, but their preparation highlydemanding effective and fast adsorbent, but their preparation conditions are more demanding [19,20]. Combined with the above experiments,we weintroduce introduce a simple and highly efficient membrane. Combined with the above experiments, a simple and highly efficient membrane for for boron removal. PSF membranes were modified by and PEI in one-step to produce boron removal. Scheme is shown in PSF-PDA/PEI and PSF-diol membranes
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