Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 210, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2021.112274
Keywords
Aryldiazonium; Surface modification; Interfacial pH sensors; 1-aminoanthraquinone; Cyclic voltammetry; Electricigen bacteria
Funding
- Region Bretagne [9621]
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By using the optimized grafted anthraquinone electrode as a pH monitoring probe, the pH change at the biofilm-electrode interface can be accurately monitored. The study found that during the biofilm colonization period, the interface pH decreased to 5.3, while the anolyte only acidified to pH 6.2.
Electrografted anthraquinone on graphite was used as a probe to monitor the pH change at the biofilm-electrode interface at the anode of a microbial fuel cell inoculated with wastewater. The grafting procedure was optimized so that the pH-dependent electrochemical response of the grafted quinone did not overlay with that of the electroactive biofilm. The variation of the formal potential of the grafted quinone as a function of pH was linear over the pH range 1-10 with a slope of - 64 mV. This allowed to monitor the interfacial pH change over three weeks of biofilm colonization of the electrode. During that time the interfacial pH decreased from neutrality to 5.3 while the anolyte only acidified down to pH 6.2. This finding is relevant as local pH change usually leads to alterations of the bioenergetics process of microbial communities and hence on the performance of bioelectrochemical devices.
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