Electronic structure and energetics of a heterodimeric BChl '/Chl ' special pair generated by exposure of to dioxygen.

Heliobacteria are anoxygenic phototrophs that have a Type I homodimeric reaction center containing bacteriochlorophyll (BChl ). Previous experimental studies have shown that in the presence of light and dioxygen, BChl is converted into 8-OH-chlorophyll (hereafter Chl ), with an accompanying loss of light-driven charge separation. These studies suggest that the reaction center only loses the ability to transfer electrons once both BChl ' molecules of the P special pair have been converted to Chl '.

Low-temperature persulfate activation by powdered activated carbon for simultaneous destruction of perfluorinated carboxylic acids and 1,4-dioxane.

Carbonaceous materials have emerged as a method of persulfate activation for remediation. In this study, persulfate activation using powdered activated carbon (PAC) was demonstrated at temperatures relevant to groundwater (5-25 °C). At room temperature, increasing doses of PAC (1-20 g L) led to increased persulfate activation (3.