“…The Fe 3 O 4 was synthesized via a simple solvothermal process as our previous study. 26 Briefly, the sodium dodecyl sulfate (SDS, 0.875 g, Keshi, China) and FeCl 3 Á6H 2 O (7 mmol, Keshi, China) were dissolved in ethylene glycol (EG, 70 mL, Keshi, China) with ultrasonication for 15 min. Then, 2-Aminoethanol (ETA, 5.25 mL, Keshi, China) was added into the above solution with vigorous stirring for 30 min.…”