In acidic pH, iron hydroxide is dissolved in the solution and in highly alkaline pH values, the produced iron hydroxides are converted into Fe(OH)4-which is more soluble than ferric hydroxide
. Thus, it can be maintained that as the hydroxide clots decrease in both very acidic and alkaline media, dye removal efficiency decreases too [12, 13].
The best method of removing it from water is through a Ferric Hydroxide
Adsorption media that guarantees waste disposal.
This could be ascribed to the large amount of ferric hydroxide
specific adsorption on the CuO surface .
Van Houthen  stated that the load of ferric hydroxide
colloid present in many streams, and transported in rivers and the near-shore ocean as a dilute suspension or adsorbed on the surfaces of clay minerals, may be the source of origin of iron minerals in soils.
The presence of ferric hydroxide
precipitate does not substantially interfere with the above reaction and the reaction proceeds very rapidly producing a bright yellow color solution as the hexavalent chromium ion is formed.
Ammonium hydroxide hydrolyses Fe[Cl.sub.3] to form ferric hydroxide
According to research information , manganese dioxide (Mn[O.sub.2]) particles created after divalent manganese oxidation in water form in neutral, and especially, in basic media negatively charged flocks, which should possess higher potential for the removal of radium cations than the ferric hydroxide
Since the electrode is made of iron, which is reactive, it oxidises to create rust (ferric hydroxide
Iron compounds exposed to ultra violet light can form ferric hydroxide
, which can sink to the bottom as tiny particles and then converted to hematite at temperatures of at least 140 degrees Fahrenheit.
A fourth method, a coagulation/filtration process, uses a ferric chloride liquid and an oxidizing agent such as sodium hypochlorite to create insoluble ferric hydroxide
. Arsenic adsorbs readily onto the solids, but workers must store and handle corrosive ferric oxide and oxidant solutions.
After carefully evaluating comparative factors and bench-scale and pilot study data, the city selected a granular ferric hydroxide
(GFH) adsorption media from USFilter, Palm Desert, Calif., to treat water at Phoenix's well #280 site.