A high Cr (VI) absorption efficiency and easy recovery adsorbent: Electrospun polyethersulfone/polydopamine nanofibers

Abstract

Cr (VI) is a highly toxic pollutant to humans, to achieve high adsorption capacity, easy recovery, and good reusability, polyethersulfone/polydopamine (PES/PDA) ultrafine fibers were prepared successfully. A series of preparing effect factors were investigated systematically and the optimum one is 8.5 pH value at room temperature and 2 g/L dopamine concentration. And then they were used as an adsorbent for the removal of Cr (VI) ions from wastewater. The effect factors pH, the adsorbent dosage, and time were discussed on Cr (VI) adsorption process and the Cr (VI) adsorption behavior was investigated. It is found that the maximum Cr (VI) adsorption capacity is 115.2 ± 4.8 mg/g at pH = 3 using 0.06 g PES/PDA with 80 mins. The Cr (VI) adsorption process followed the pseudo‐second‐order model (r2 ≥ 0.99) and adsorption isotherms were fitted to the Langmuir model (R2 ≥ 0.999). Furthermore, the Cr (VI) adsorption mechanism was supposed according to the X‐ray photoelectron spectroscopic results. Finally, PES/PDA ultrafine fibers were considered to be a promising adsorbent with good stability (decomposing temperature, 356°C), high adsorption efficiency (112.1 ± 2.5 mg/g), and good reusability (three times) on the coexistence of anions and the actual industry wastewater environment.

Preparation of a phenylboronic acid and aldehyde bi-functional group modified silica absorbent and applications in removing Cr(vi) and reducing to Cr(iii)

“…Adsorption is considered as the most promising method due to its high efficiency, easy to operate, economical, renewable, and technological feasibility. 20,21 Numerous adsorbents including silica gel, 10,22 various types of nanomaterials, [23][24][25] nanobers, 19,26 biochar, 20,27 hydrogel, 28 functionalized polymers, 8,29 metal composite 30 and metal-organic frameworks 31 have been used for Cr(VI) removal.…”

“…The increased adsorption with temperature indicated that the adsorption was endothermic. 19,25,26,62 It was presumed that the increase in temperature and the acceleration of ion motion lead to the acceleration of electrostatic attraction and reduction reactions. It was consistent with the rate change of a redox reaction with temperature.…”

Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

“…[12,13] Long-term exposure to hexavalent chromium more than the permissible limit can cause nausea, nervous disorder, kidney failure, liver diseases, and cancer. [14,15] The various technologies developed for Cr (VI) removal from water or wastewater streams include chemical precipitation, [16] ion exchange, [17] bioremediation, [18] photocatalytic reduction, [19] electrokinetic, [20] remediation membrane separation, [7] electrodialysis, [21] and adsorption. [22] Among these, the adsorption method is widely used in the cleaning of Cr (VI) contaminated water due to its wide range of raw materials and no by-products, easy recovery, simple operation, and high efficiency.…”