Rapid Catalytic Microwave Method To Damage Microcystis aeruginosa with FeCl₃-Loaded Active Carbon

Abstract

In recent years, effective methods for cyanobacterial blooms treatment have been an important issue. In this study, we demonstrated a rapid catalytic microwave method to deal with Microcystis aeruginosa with FeCl(3)-loaded active carbon. Microcystis aeruginosa damage process was monitored by measuring optical density, chlorophyll-a content, superoxide dismutase activity, l-glutathione content, and turbidity of the treated Microcystis aeruginosa suspension. It was found that this method could quickly and efficiently induce the degradation of Microcystis aeruginosa. On the basis of control experiments and characterization results, we attributed the excellent catalytic performance to the synergy effect between hole-doping of the catalyst and hot spot of microwave irradiation. This work provides a fast and green treatment method for cyanobacterial blooms.

Enhanced decomposition of dimethyl phthalate via molecular oxygen activated by Fe@Fe2O3/AC under microwave irradiation

“…These excited electrons could transfer from AC to Fe@Fe 2 O 3 because of the excellent conductivity of the latter. Similar phenomenon was observed in our previous work, in which we found that MW irradiation could induce the separation of the electron/hole pairs in AC via the so-called charge transfer-induced doping effect, which could realize electrons transferring from AC to Fe 3+ ions [21]. On the basis of the previous studies and the above experimental results, we proposed a possible mechanism for the reactive oxygen species generation via molecular oxygen activation over Fe@Fe 2 O 3 /AC under MW irradiation (Fig.…”

“…Coal-based columnar activated carbon was washed with de-ionized water for several times and then immersed in 8-10 wt% hydrochloric acid for 18 h. The acid treated activated carbon was then treated with boiling water for 2 h and washed with de-ionized water until the pH reached 5-6. Finally, the pretreated AC was dried in an oven at 105 • C for 8 h for use [21][22][23][24]. For the loading of Fe@Fe 2 O 3 core-shell nanowires, the pretreated AC was first soaked in ferric chloride solution (FeCl 3 , 0.1 M) under stirring for 3 h for ferric iron absorption.…”

“…For comparison, the Fe@Fe 2 O 3 supported on molecular sieve (Fe@Fe 2 O 3 /MS) catalyst was prepared by the similar method with Fe@Fe 2 O 3 /AC. The FeCl 3 /AC catalyst was obtained without the reduction of ferric ions with sodium borohydride solution [21]. The Cu supported on activated carbon (Cu/AC) catalyst was prepared with the similar method by using CuCl 2 solution instead of FeCl 3 solution.…”

“…8). First, MW irradiation would speed up the electron movement and thus induce the separation of the electron/hole pairs as well as the subsequent transferring of electron from AC to Fe@Fe 2 O 3 because of the excellent conductivity of the latter [21,33]. This electron transferring could inhibit the recombination of electron/hole pairs in AC and thus improve the lifetime of electrons.…”

“…Recently, our group developed a rapid catalytic MW method to deal with Microcystis aeruginosa by FeCl 3 -loaded active carbon (FeCl 3 /AC) [21]. We attributed the catalytic induced M. aeruginosa damage under MW irradiation to the charge transfer-induced doping effect.…”