The toxic cyanides in gold cyanide residues produced the cyanidation process of extraction threaten environmental safety and inhibit recovery valuable metals. In this study, removal through persulfate-advanced oxidation was investigated, heat activation ultrasonic were tested for removal. results showed that residue could be removed by 2.0 wt.% potassium persulfate at pH 10.0 after 60 min react...

In the present study, biochars from rice husk were synthesized via pyrolysis at 400, 550, 700 and 850 °C for 1 h under a limited O2 atmosphere, characterized with various techniques of used as catalysts to activate persulfate degrade sulfamethoxazole (SMX). After physicochemical characterization biochars. SMX degradation tests performed using different water matrices, biochar concentrations ini...