Bifunctional Adsorbents Based on Jarosites for Removal of Inorganic Micropollutants from Water

This paper presents a novel family of jarosites with the molecular formula MFe3(SO4)2(OH)6·xH2O; M = Na, K, NH4 that have high efficiency in adsorption As(V) and Pb(II) dissolved water. The been prepared by conventional heating at temperatures close to 95 °C for 3 h. synthesis method was improved optimized reduce time energy consumption. allowed Na− K−jarosites yield up 97.8 wt.% 105 150 °C, respectively, Na−, K−, NH4−jarosites were synthesized 5 min via microwave-assisted method, which yielded jarosite crystalline agglomerates more uniform topography, shape, size than method. Both methods selective jarosites. Chemical decomposition suspended water occurred pH less 2 higher 10 °C. In solid state, thermally stable least 300 Na−jarosite presented maximum capacity (Qmax) 65.6 mg g−1 94 Pb(II). are considered promising bifunctional adsorbents remediation contaminated due their stability, ions different natures.