Copper II Arsenate

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copper ii arsenate is an inorganic compound with the formula CuAsO. It is a moderately toxic, brown-black solid that can be made from copper sulfate and arsenic acid by precipitation. It is used in the manufacture of paints and coatings, as an anti-corrosive in metals and as a wood preservative.

In preferred embodiments of the invention, a solution of soluble arsenate (or arsenite) and a solution of copper sulfate are combined in a metallurgical process. The arsenite is extracted from the ores, concentrates or speiss obtained by leaching. The sulfate is added to the arsenite solution or copper sulfate solution to produce a mixture of the two compounds in solution, which is then subjected to liquid-solids separation and recovery. The copper arsenate produced in this manner is substantially free of sludge-forming impurities such as iron and lead.

The arsenate adsorption capacities of the two materials were measured in batch experiments at various pH values, using different concentrations of challenge water. It was found that, at low concentrations, Zn-HypoGel significantly outperformed Bayoxide E33. This was due to the better affinity of the zinc(II) metallo-receptors for arsenate, as shown by ITC and titration results.

The titration data were used to compare the number of adsorption sites on the two sorbents, with the aim of determining the number of moles of Zn-HypoGel sites that would adsorb one mole of arsenate. It was calculated that 1 mole of Zn-HypoGel site adsorbs 0.6 moles of arsenate, compared with only 0.24 mol of Bayoxide E33 sites. The higher number of adsorption sites was attributed to the greater arsenate binding capability of the Zinc(II) metallo-receptor complex 3 (see Supporting Information).