Fe_3O_4@SiO_2-Cu复合磁性纳米粒子的制备及其脱硫性能的研究
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摘要
采用水解法合成了核壳型Fe_3O_4@SiO_2载体,用等体积浸渍法在磁性Fe_3O_4@SiO_2载体表面负载CuCl_2,得到Fe_3O_4@SiO_2-Cu磁性纳米粒子吸附剂。采用XRD、TEM、FT-IR、XPS、N_2吸附-脱附和振动样品强磁计(VSM)等表征手段对制备的吸附剂进行表征,考察了吸附剂对模型汽油中不同硫化物的脱硫性能。结果表明,核壳型Fe_3O_4@SiO_2载体的比表面积为246.5 m~2/g,同时饱和磁强度为44.6 emu/g。负载铜离子后,Fe_3O_4@SiO_2-Cu的饱和磁强度为43.9 emu/g。Fe_3O_4@SiO_2-Cu吸附剂可有效吸附噻吩类硫化物,硫容可达1.42 mg(S)/g(吸附剂)。采用先醇洗后焙烧的方法对失活吸附剂进行再生,吸附剂循环使用5次后仍能保持良好的再生稳定性。
Magnetic core-shell type Fe_3O_4@ SiO_2 carrier is synthesized by hydrolysis method. Fe_3O_4@ SiO_2-Cu magnetic nanoparticles adsorbent is prepared by loading CuCl_2 on the surface of magnetic Fe_3O_4@ SiO_2 carrier through equal volume impregnation method.XRD,TEM,FT-IR,XPS,N_2 adsorption-desorption and VSM are used to analyze the characteristics of the adsorbent.And the desulfurization performances of the absorbent against different sulfides in model gasoline are investigated. The results show the specific surface area and the saturated magnetic strength of core-shell Fe_3O_4@ SiO_2 carrier are 246. 5 m~2·g~(-1) and 44. 6 emu·g~(-1),respectively.After loading copper ions,the saturated magnetic strength of Fe_3O_4@ SiO_2-Cu reaches 43. 9 emu·g~(-1).Fe_3O_4@ SiO_2-Cu adsorbent can effectively adsorb thiophene sulfide,with sulfur capacity up to 1. 42 mg of sulfur per gram adsorbent. The deactivated adsorbent can be regenerated by the method of alcohol-washing and roasting.The absorbent remains good regenerative stability after 5 times recycling.
Magnetic core-shell type Fe_3O_4@ SiO_2 carrier is synthesized by hydrolysis method. Fe_3O_4@ SiO_2-Cu magnetic nanoparticles adsorbent is prepared by loading CuCl_2 on the surface of magnetic Fe_3O_4@ SiO_2 carrier through equal volume impregnation method.XRD,TEM,FT-IR,XPS,N_2 adsorption-desorption and VSM are used to analyze the characteristics of the adsorbent.And the desulfurization performances of the absorbent against different sulfides in model gasoline are investigated. The results show the specific surface area and the saturated magnetic strength of core-shell Fe_3O_4@ SiO_2 carrier are 246. 5 m~2·g~(-1) and 44. 6 emu·g~(-1),respectively.After loading copper ions,the saturated magnetic strength of Fe_3O_4@ SiO_2-Cu reaches 43. 9 emu·g~(-1).Fe_3O_4@ SiO_2-Cu adsorbent can effectively adsorb thiophene sulfide,with sulfur capacity up to 1. 42 mg of sulfur per gram adsorbent. The deactivated adsorbent can be regenerated by the method of alcohol-washing and roasting.The absorbent remains good regenerative stability after 5 times recycling.
引文
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