Higher efficiency of triethanolamine-grafted anion exchange membranes for acidic wastewater treatment
2020
Khan, Muhammad | Su, Jinzhan | Lichtfouse, Eric | Guo, Liejin | Xi'an Jiaotong University (Xjtu) | Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
International audience
اظهر المزيد [+] اقل [-]إنجليزي. Acidic wastewaters are major industrial effluents that must be cleaned before release in natural waters, yet classical treatment methods are limited. Diffusion dialysis through anion exchange membranes (AEM) appears as a sustainable alternative because those membranes are cheap and highly selective, yet there is a need for improved membranes. Here we synthesized AEMs from brominated poly(2,6-dimethyl-1,4-phenylene oxide) using triethanolamine as an ion-exchange group for acid recovery. The prepared membranes were characterized by Fourier-transform infra-red spectroscopy, scanning electron microscopy, and atomic force microscopy. Acid recovery was tested with a mixture of HCl and FeCl2. Results show that increasing triethanolamine content into the membrane polymer matrix led to an increase of water uptake from 12% to 117%, ion exchange capacity from 1.28 to 2.29 mmol/g, and linear swelling ratio from 3.52% to 32.70%. The diffusion dialysis coefficient of acid (U H +) reached 23 × 10-3 m/h, which is higher than that actual membranes, of 0.37-20 × 10-3 m/h. U H + increased with membrane triethanolamine content, which is explained by increasing H bonding of aqueous protons with membrane hydroxyl groups. U H + also increased from 23 × 10-3 m/h at 25°C to 71 × 10-3 m/h at 55°C due to easier ion flow. Moreover, the separation factor (S) reached 495 at 25°C, which is higher than that of actual membranes, of 73-351. The diffusion dialysis coefficient of metal (U Fe 2+) ranged from 0.0025 to 61 10-3 m/h. Membranes also showed excellent thermal, chemical and mechanical stability.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique