Optimization of the separation and purification of Al13

Abstract

The optimum process for the separation and purification of Al 13 was investigated in detail in this paper. The various influencing factors were discussed. The experimental results show that the concentration and basicity (B, OH/Al ratio) of polyaluminum chloride (PACl), Al/SO 4 ratio, Ba/SO 4 ratio and ultrasonic reaction have different roles in the separation and purification of Al 13 . Moderate concentration of PACl with the basicity around 2.0 gives some benefits in the separation of Al 13 . An optimization condition has then been found to obtain high purity Al 13 by involving Al/SO 4 and Ba/SO 4 ratios of 1:1, and 3 h ultrasonic time. Further indication on the separation of Al 13 is also discussed.

Hydrolyzed Al(III)-clusters. II: Speciation transformation and stability of Al13 aggregates

“…The separation and preparation of pure Al 13 was carried out shown in a previous publication [3,10]. Batches of purified Al 13 samples were mixed together and freeze-dried to a white solid powder.…”

“…A large amount of investigation and practical application shows that the AlO 4 Al 12 (OH) 24 7+ (simplified as Al 13 ) is the most efficient species in PACl coagulant [9,10]. The content of Al 13 is therefore the main quality index in PACl products besides the basicity B, i.e.…”

Influence of coagulation mechanisms on the residual aluminum – The roles of coagulant species and MW of organic matter

“…The characters of prepared coagulants were detected by a 400 MHz 27 Al NMR spectrometer (Brookhaven Co., USA) and DU650 Beckman UV-vis spectrophotometer (USA) (Ferron timed complex-colorimetric method) [21]. …”

Novel ferromagnetic nanoparticle composited PACls and their coagulation characteristics

“…Al species of MPACl2.0s and PACl2.0 were characterized by 500 MHz 27 Al NMR, and instrumental settings and experimental conditions were addressed elsewhere (Xu et al, 2003). The internal standard was 0.05 mol/L NaAlO 2 with its chemical shift at 80 ppm downfield.…”