▎ 摘　　要

NOVELTY - Preparing iron- graphene oxide/chitosan (GO/CS) composite microsphere comprises (i) ultrasonically stirring and dispersing graphene oxide powder and an acetic acid solution with volume fraction of 1.5%, adding chitosan powder, and ultrasonically stirring until completely dissolved to obtain a graphene oxide/chitosan mixed solution, namely GO/CS mixture, (ii) adding iron chloride hexahydrate (FeCl3.6H2O) into GO/CS mixed solution, stirring to FeCl3.6H2O is completely dissolved to obtain different iron content of Fe-GO/CS mixed solution, (iii) dropping the Fe-GO/CS mixed solution into the sodium hydroxide solution, allowing to stand and aging for 24 hours, filtering, washing by de-ionized water until it is close to neutral to obtain wet Fe-GO/CS composite microsphere, and (iv) placing wet Fe-GO/CS composite microsphere in 5 wt.% glutaraldehyde-methanol mixed solution, slowly vibrating and cross-linking for 2 hours, filtering, washing with ethanol-de-ionized water and drying.NaOH solution USE - The microsphere is useful as adsorbent (claimed). ADVANTAGE - The microsphere is simple in preparation, low in cost, less likely to cause secondary pollution, and has good removal effect on arsenic (As)(III) in water bodies.