Influence of cation building blocks of metal hydroxide precipitates on their adsorption and desorption capacity for phosphate in wastewater—A screening study

Nanostructured ZnFeZr oxyhydroxide precipitate as efficient phosphate adsorber in waste water: understanding the role of different material-building-blocks

“…The synthesis of the metal oxyhydroxides is based on a published procedure. 22,24,26 The precursor solution of the different samples was prepared by dissolving the desired amount of the three different metal salts of zinc, iron and zirconia in 100 mL of deionised water. The obtained solution was then added dropwise to 400 mL of 0.15 M NaOH solution in a 1 L round flask under stirring (300 rpm) within 10 min, maintaining a pH-value of pH > 10 the whole time to ensure that all metals were precipitated as oxides or hydroxides re-spectively.…”

“…† The findings are in line with previous work done by us on the standard adsorber material and related structures and the kinetics modelling is discussed in more detail there. 24,25 A comparison of the different curves reveals the influence of the employed metal salts. Starting from the standard sample 1, a decrease of zinc (sample 2) increases the phosphate uptake, whereas an increase of zinc (sample 3) decreases the phosphate uptake.…”

“…This is not studied herein, however, it was exhaustively examined and discussed in other previous work by us. 24,25 A comparison of sample 1 with sample 8 (the sample that has the same composition as sample 1 but as a result of post-precipitation mixing and not simultaneous co-precipitation) reveals a significantly higher phosphate uptake for sample 1. Thus, the interconnected nanocomposite structure of crystalline and amorphous material, as it occurs by coprecipitation of all three metal cations, is crucial for better phosphate adsorption.…”

“…Recently, we reported on a promising material created from the elements Zn, Fe and Zr which in a screening study 24 turned out to be the most promising candidate with respect to P adsorption among many other metal hydroxides tested. We also succeeded in depositing the material on magnetic carrier particles.…”

Diaphragm‐Regulated Growth of Nanosheet Arrays of α‐Phase Ni–Co Layered Double Hydroxides on Arbitrary Substrates for Wettability Control and Rechargeable Alkaline Batteries

“…Layeredh ydroxides (LHs), which have interesting chemical and physicalp roperties, can find many important applications. [1][2][3][4][5] For example, layered transition metal hydroxides have demonstrated promisinga pplications in energy storage, [6,7] wastewater treatment, [8,9] catalysis, [10,11] and control of surface wettability. [12,13] As ar epresentative group of LHs, layered double hydroxides (LDHs) and their derivatives are attracting much attention recently,p articularly in energy-storage fields.…”