Removal of reactive magenta-MB from aqueous solution by persulphate-based advanced oxidation process

Abstract

In this study, the possibility of removing magenta-MB by persulphate (PS)-based advanced oxidation process has been evaluated. PS was activated by chemical means with the use of ferrous ion to produce sulphate radical (SO Å 4 ). Experiments were conducted in batch mode. The effect of operational parameters such as PS dosage (varied from 40 to 140 mg/L), ferrous ion dosage (varied from 0 to 100 mg/L), pH (both acidic and basic) and contact time were studied. For an initial dye concentration of 100 mg/L, maximum decolourization efficiency of 96.33% was obtained within 30 min with a PS dosage of 100 mg/L and ferrous ion dosage of 60 mg/L. At the optimum conditions, TOC removal efficiencies of 55.23 and 61.2% were obtained in 30 and 60 min, respectively. The effect of inorganic ions (Cl − , F − and SO 2À 4 ) on the treatment efficiency was also evaluated. It was found that the inhibiting effect due to the presence of inorganic ions followed the order as: F − >> Cl − > SO 2À 4 . Very good removal efficiency obtained with very low chemical dosage (PS and Fe 2+ ) makes iron-activated PS a good alternative for the removal of dye from aqueous solution.

Removal of rhodamine B from a water medium using hydroxyl and sulphate radicals generated by iron loaded activated carbon

“…49 The rate of the second scavenging reaction was higher than the rst one, which indicates that the more signicant scavenging was due to the reaction between sulphate radicals. 50 Similar results were observed by Sarath et al 38 for magenta MB degradation.…”

“…This removal is mainly by the persulphate anions present in water. In a similar way, less than 10% of magenta-MB dye removal was observed by Sarath et al 38 These insignicant removal efficiencies of persulphate indicate the signicance of activation in persulphate based advanced oxidation processes. When IAC was present in water, about 50% of dye was removed from the aqueous solution aer 15 min, indicating that adsorption of dye took place more quickly on the active sites of IAC.…”

WITHDRAWN: Treatability of Pharmaceutical Wastewater by Using Combined Ultrasound Cavitation and Persulfate Process

“…At pH 2 higher amount of proton present in form of 3 + which decreases effective decomposition of persulfate oxidant while increasing pH, quantity of 3 + ions decreases in solution which leads to effective generation of sulfate radicals from persulfate as in shown in given Eqn. ( 3) & ( 4) (Romero et al, 2010;Sarath et al, 2016).…”

“…6. The increasing amplitude at pH 2, removal of COD increased to 30.8% and on other hand middle level pH 5 with amplitude up to 50% removal efficiency increases further as a result of generation of effective cavitation and effective decomposition of persulfate (Sarath et al, 2016). Further increasing amplitude to 80% at pH 5, reduces removal due to reduced cavitational yield, thus increasing or decreasing amplitude beyond or below 50% under near acidic condition (Thanekar & Gogate, 2019).…”

Fe73.5Si13.5B9Cu1Nb3 metallic glass: Rapid activation of peroxymonosulfate towards ultrafast Eosin Y degradation

“…It is observed that TOC removal rate increases with the reaction time and up to 60 % can be reached within 30 min, indicating that the reactive species generated by PMS activation can effectively convert dye molecules into CO 2 , H 2 O and other harmlessly inorganic substances. Similar TOC removal rate can be achieved with a wide pH range, which is reported by Sarath et al[63]. However, more than 50% of mineralization rate can be seen within 20 min in this work, indicating a higher efficiency.…”