Facile synthesis of new amino-functionalized agrogenic hybrid composite clay adsorbents for phosphate capture and recovery from water. (15th October 2017)

• Record Type: Journal Article
• Authors: Unuabonah, Emmanuel I.; Agunbiade, Foluso O.; Alfred, Moses O.; Adewumi, Thompson A.; Okoli, Chukwunonso P.; Omorogie, Martins O.; Akanbi, Moses O.; Ofomaja, Augustine E.; Taubert, Andreas
• Is Part Of: Journal of cleaner production. Volume 164(2017)
• Page Start: 652
• Page End: 663
• Publication Date: 2017-10-15
• Subjects: Composite adsorbents -- Sustainable -- Phosphate recovery -- Water -- Desorption kinetics; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2017.06.160
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: New hybrid clay materials with good affinity for phosphate ions were developed from a combination of biomass- Carica papaya seeds (PS) and Musa paradisiaca (Plantain peels-PP), ZnCl2 and Kaolinite clay to produce i PS-HYCA and i PP-HYCA composite adsorbents respectively. Functionalization of these adsorbents with an organosilane produced N PS-HYCA and N PP-HYCA composite adsorbents. The pHpzc for the adsorbents were 7.83, 6.91, 7.66 and 6.55 for i PS-HYCA, N PS-HYCA, i PP-HYCA and N PP-HYCA respectively. Using the Brouer-Sotolongo isotherm model which best predict the adsorption capacity of composites for phosphate, i PP-HYCA, i PS-HYCA, N PP-HYCA, and N PS-HYCA composite adsorbents respectively. When compared with some commercial resins, the amino-functionalized adsorbents had better adsorption capacities. Furthermore, amino-functionalized adsorbents showed improved adsorption capacity and rate of phosphate uptake (as much as 40-fold), as well as retain 94% (for N PS-HYCA) and 84.1% (for N PP-HYCA) efficiency for phosphate adsorption after 5 adsorption-desorption cycles (96 h of adsorption time with 100 mg/L of phosphate ions) as against 37.5% (for i PS-HYCA) and 35% (for i PP-HYCA) under similar conditions. In 25 min desorption of phosphate ion attained equilibrium. These new amino-functionalized hybrid clay composite adsorbents, which were prepared by a simple means that is sustainable, have potentials for the efficient capture of phosphate ions from aqueous solution. They are quickly recovered from aqueous solution, non-biodegradable (unlike many biosorbent) with potentials to replace expensive adsorbents in the future. They have the further advantage of being useful in the recovery of phosphate for use in agriculture which could positively impact the global food security programme. Graphical abstract: Highlights: Facile preparation of hybrid clay doped with Zn. Efficient removal of phosphate anion from water. Functionalization with amino compounds improves rate of uptake. Desorption more efficient with amino functionalized adsorbents.