Fe–Al layered double hydroxides in bromate reduction: Synthesis and reactivity

Enhanced inhibition of bromate formation in catalytic ozonation of organic pollutants over Fe–Al LDH/Al2O3

“…While no significant BrO 3 À reduction was observed in Fe(III) and HA containing solution (curve c) because the Fe(II) formation via an electron transfer process within the complex of HA-Fe(III) is a very slow process (about several hundred hours) [28]. The results indicated that BrO 3 À was reduced by Fe(II) [24,25] and enhanced by the complexes of iron and HA. and their catalytic ozonation byproducts had a positive effect on the enhancement of Fe(II) generation.…”

“…Based on the reference [24], Fe-Al LDH was supported on Al 2 O 3 by co-precipitation method with continuous nitrogen gas bubbling. In a typical procedure, FeCl 2 Á4H 2 O and AlCl 3 Á6H 2 O (Fe/Al molar ratio was 1:1) were dissolved in 3 mL of deionized water and 2 g Al 2 O 3 was then added to this solution.…”

“…Thus, it is necessary to investigate the degradation process of organic compounds with different structure and its influence on the minimization of BrO 3 À formation in catalytic ozonation. Recently, Fe-Al LDH has been used to reduce BrO 3 À in water via an adsorption process [24,25]. In this study, Fe-Al LDH was supported on mesoporous c-Al 2 O 3 by a hydrothermal hydrolysis process and its performance on catalytic ozonation of refractory organics and BrO 3 À control was also investigated.…”

Liberação de nitrato de hidróxidos duplos lamelares como potenciais fertilizantes de liberação lenta

“…São vários os métodos para obter os HDL (Crepaldi & Valim, 1998), e o da coprecipitação a pH alcalino constante é um dos mais utilizados (Olanrewaju et al, 2000;Olfs et al, 2009;Chitrakar et al, 2011). Ao aplicar um método em determinadas condições de síntese e escolher os íons a serem intercalados buscam-se obter estruturas com propriedades químicas e físicas específicas.…”

Removal of boron species by layered double hydroxides: A review

“…magnesium [18][19][20][21][22][23][24] and aluminium [25], lithium [26], chromium [27,28], Iron [17,[29][30][31][32][33][34][35][36], calcium [37], zinc [38][39][40][41], gallium [42][43][44][45], nickel [31,40,[46][47][48], indium [43], cobalt [31], manganese [49] and copper [48]. Because of their structure, LDHs are the only clay minerals that exhibit natural anion exchange properties.…”