Add time:08/07/2019         Source:sciencedirect.com

The uptake of styryl phosphoric acid (SPA) by stannic oxide was studied using three independent measures of the adsorption process: (i) adsorption isotherms, (ii) zeta potentials of stannic oxide particles before and after adsorption and (iii) the release of hydroxyl ions from the stannic oxide during SPA uptake. The uptake of structurally similar styryl sulfonic acid, benzene arsonic acid and benzene sulfonic acid was also measured. The results are consistent with exchange chemisorption between phosphonate anions and surface hydroxyl groups being the main adsorption mechanism for SPA between pH 3 and 5.

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