The effect of various environmentally friendly chemical additives and natural products on the dissolution of amorphous silica (Aerosil 200 and laboratory-synthesized, SSD) is studied. The silica scale dissolvers tested include the following: ascorbic acid (vitamin C, ASC ), citric acid ( CITR ), carboxymethyl inulin ( CMI ), 3,4-dihydroxybenzoic acid (catechuic acid, DHBA ), 3,4,5-trihydroxybenzoic acid (gallic acid, GA ), dopamine hydrochloride ( DOPA ), iminodiacetic acid ( IDA ), histidine ( HIST ), phenylalanine ( PHALA ), and malic acid ( MAL ). The chemical structures of these chemical additives contain potentially dissolution-active moieties, such as 1,2-dihydroxyethylene ( ASC ), α-hydroxycarboxylate ( MAL and CITR ), catecholate ( DHBA, GA, and DOPA ), α-aminocarboxylate ( HIST and PHALA, both aminoacids), and finally carboxy-modified fructofuranose units ( CMI ). It was found that all studied molecules showed variable dissolution efficiency, with MAL, CMI, HIST, and PHALA being the slowest/least effective dissolvers, and the catechol-containing DHBA, GA, and DOPA being the most effective ones. IDA and CITR have intermediate efficiency.
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Demadis et al. (2011) studied this question.
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