Acetylacetone promoted high-efficiency coagulation toward arsenite through a synchronous photooxidation process

Abstract

Titanium xerogel coagulant (TXC) is a novel Ti-based coagulant developed in recent years. TXC possesses dual functions of “photooxidation” and “coagulation”, and the former is attributed to the photoactivity of...

Synchronous Photooxidation–Coagulation for the Efficient Treatment of Algae-Laden Water by Utilizing Titanium Xerogel Coagulant

“…21−24 TXC exhibits dual functionality of coagulation and photooxidation, with the latter attributed to AA in its polymeric Ti−O−Ti skeleton structure. 25 AA, a small molecule diketone with enol and keto isomers, has significant photoactivity, particularly under UV 254 irradiation. 26,27 Notably, the photooxidation efficiency of AA is comparable to that of H 2 O 2 owing to its strong light absorption capacity.…”

“…Titanium xerogel coagulant (TXC), a novel Ti-based coagulant synthesized using the sol–gel method with TiCl 4 as the Ti precursor and acetylacetone (AA) as the hydrolytic regulator, has attracted a considerable amount of attention in recent years. − TXC exhibits dual functionality of coagulation and photooxidation, with the latter attributed to AA in its polymeric Ti–O–Ti skeleton structure . AA, a small molecule diketone with enol and keto isomers, has significant photoactivity, particularly under UV 254 irradiation. , Notably, the photooxidation efficiency of AA is comparable to that of H 2 O 2 owing to its strong light absorption capacity. , AA has shown effective performance under UV irradiation in various applications, such as decolorization of dye wastewater, simultaneous As­(III) oxidation and nitrate reduction, decomplexation of Cu-EDTA compounds, and degradation of microcystin. ,− Previous research revealed that ∼0.07 mM AA was released to solution during coagulation treatment of algae-laden water at a TXC dose of 60 mg/L, which effectively decreased the extracellular microcystin concentration from 40 to 7 μg/L during a 16 day floc storage process .…”

“…Furthermore, AA exhibited superior efficiency in degrading the toxic microcystin-LR (MC-LR) and destroying partial AOM under simulated solar irradiation . The synchronous photooxidation–coagulation ability of TXC has been verified for arsenate [As­(III)] treatment . Upon introduction of UV 254 irradiation into the TXC coagulation process, AA oxidized As­(III) into arsenate [As­(V)] that was more easily removed by coagulation, thereby improving the efficiency of removal of arsenic over a wider pH range.…”