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Ferrite magnetic nanoparticles Fe3O4 (2 g) and NiCl2·6H2O (10 wt% of nickel on ferrite) were stirred at room temperature in aqueous solution for 1 h. After impregnation, the suspension was adjusted to pH 12 by adding sodium hydroxide (0.5M) and stirred for 10 to 12 h. The solid was washed by distilled water (5 10 mL). The obtained metal precursors were reduced by adding an aqueous solution of 0.2MNaBH4 dropwise under gentle stirring in an ice– water bath for 30 min until no bubbles were observed in the solution. The resulting Fe3O4Ni MNPs were ultrasonicated for 10 min and then washed with distilled water and subsequently with ethanol. The synthesized Fe3O4Ni MNPs were characterized by several techniques such as XRD, ICP-AES, TEM, and FEG-SEM-EDS.調(diào)節(jié)PH值攪拌后,我用抽濾得到固體,然后再滴加硼氫化鈉一直有氣泡產(chǎn)生,為什么?冰水浴溫度是3攝氏度。 |
榮譽版主 (文壇精英)
山濤
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專家經(jīng)驗: +925 |
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向NiCl2溶液(含有0.2g Ni2+)中加入2gFe3O4納米顆粒,室溫下攪拌1h。用0,5M NaOH調(diào)節(jié) 上述混合物pH至12,同時攪拌10-12h。5ml蒸餾水洗滌固體。然后將上述的固體置于冰水浴中逐滴加入0.2M NaBH4 溶液,緩慢攪拌,直到?jīng)]有氣泡產(chǎn)生。所得的Ni@Fe3O4納米顆粒超聲10min,先用蒸餾水洗滌,再用乙醇清洗。用XRD,ICP-AES,TEM,F(xiàn)E-SEM-EDS表征合成的Ni@Fe3O4納米顆粒。 產(chǎn)生氣泡的原因是Ni2+被NaBH4還原,有氣體產(chǎn)生。冰水浴的溫度理論上是0度,具體數(shù)值沒有必要過于關心,只是用于吸收氧化還原反應釋放的熱量,防止劇烈反應。 |

榮譽版主 (文壇精英)
山濤
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專家經(jīng)驗: +925 |

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