Phosphate Sorption Speciation and Precipitation Mechanisms on Amorphous Aluminum Hydroxide

Influence of catechin on precipitation of aluminum hydroxide

Adsorption behavior of condensed phosphate on aluminum hydroxide.

Sodium pyrophosphate (pyro-P, Na4P2O7), sodium tripolyphosphate (tripoly-P, Na5P3O10), and sodium hexametaphosphate (meta-P, (NaPO3)6) were selected as the model compounds of condensed phosphate to investigate the adsorption behavior of condensed phosphate on aluminum hydroxide. The adsorption was found to be endothermic and divisible into two stages: (1) fast adsorption within 1 h; and (2) slo...

Silicate Removal in Aluminum Hydroxide Co-Precipitation Process

The removal mechanisms of silicate using an aluminum hydroxide co-precipitation process was investigated and compared with an adsorption process, in order to establish an effective and validated method for silicate removal from wastewater. Adsorption isotherms, XRD and FT-IR analyses showed that silicate uptake occurred by adsorption to boehmite for initial Si/Al molar ratios smaller than two, ...

Methylarsenic Sorption and Speciation Mechanisms in Natural Systems

Arsenic (As) originates in many rocks and minerals throughout the world. Natural phenomena, such as weathering and biological activities, along with industrial activities and agricultural activities are responsible for As introduction to the environment. The most predominate oxidation states for inorganic As species are arsenate As (H3AsO4) and arsenite As (H3AsO3). In addition to inorganic for...

Effects of organic acids on desorption of phosphate from the surfaces of aluminum hydroxide and complexes

The desorption of phosphate from aluminum (Al) hydroxides by 0.01 mol L KCl in the presence of different organic acids and from Al-OH, Al-P and Al-Oxalate, AlCitrate complexes by organic acids was studied. When phosphate adsorbed on Al(OH)x in the presence and absence of oxalate was desorbed sequentially twice using 0.01 mol L KCl, total desorption rates of phosphate adsorbed in the presence of...