▎ 摘　　要

NOVELTY - Preparing magnetic hydroxypropylchitosan HPCS/graphene oxide (GO) adsorbent comprises adding HPCS to water and glacial acetic acid solution, ultrasonically treating to fully dissolve, adding magnetic strontium hexaferrite, stirring, slowly adding liquid paraffin under stirring condition, continuing to stir, adding glutaraldehyde to crosslink hydroxypropyl chitosan, at the same time, adding graphene oxide, reacting, adding sodium hydroxide to adjust pH, maintaining at 80 degrees C for 1 hour, and orderly washing the resulting product with petroleum ether, ethanol and deionized water. USE - The adsorbent is useful for removing heavy metal ions, preferably chromium (vi) ion, lead(ii) ion and cadmium(ii) ion and mercury(II) ion in water (claimed). ADVANTAGE - The adsorbent: has simple preparation process; has high heavy metal adsorption capacity; can be easily separated and repeatedly used; does not produce secondary pollution during absorbing process; and has excellent heavy metal treatment effect in wastewater. DETAILED DESCRIPTION - Preparing magnetic hydroxypropylchitosan (HPCS)/graphene oxide (GO) adsorbent comprises adding 0.3-0.5 g HPCS to 20 ml water, and 4-6 ml glacial acetic acid solution, ultrasonically treating at room temperature for 2-5 hours to fully dissolve, adding 0.15-0.15 g magnetic strontium hexaferrite, stirring for 1-2 hours, slowly adding 3 ml liquid paraffin under stirring condition, continuing to stir for 0.5 hours, adding 3 ml 25% glutaraldehyde to crosslink hydroxypropyl chitosan, at the same time, adding 0.1-0.3 g graphene oxide, reacting at 50 degrees C for 1-2 hours, adding 2 mol/l sodium hydroxide to adjust pH to 9-10, maintaining at 80 degrees C for 1 hour, and orderly washing the resulting product with petroleum ether, ethanol and deionized water to pH to 7 to obtain the adsorbent. An INDEPENDENT CLAIM is also included for use of the magnetic HPCS/graphene oxide (GO) adsorbent for removing heavy metal ions in water, comprising (a) taking 25 ml 30-60 mg/l heavy metal ionic solution in 10 ml conical flask, adjusting pH to 3-6, adding 10-16 mg magnetic HPCS/GO adsorbent, placing in a 25 degrees C constant temperature water bath oscillator, oscillating for 1-3 hours, removing the conical flask, using strong magnet for separating the adsorbent and solution, taking the supernatant, detecting the concentration of heavy metal ions, and calculating the concentration of heavy metal ions in supernatant, and calculating the concentration of heavy metal ions, and calculating the removal rate of heavy metal ions based on initial concentration of heavy metal ions (Co) and adsorption in the solution and concentration of heavy metal ions (Ce) in the solution.