Recoverable heavy metal ion adsorbent and preparation method thereof

[0028] Example 1

[0029] An adsorbent that can recover heavy metal ions has a core-shell structure, wherein the core is porous SiO 2 , the shell is Fe 3 O 4 C, which is prepared by a method comprising the steps of:

[0030] (1) At room temperature, 50 mg of SiO with a particle size of 140 nm was 2 The powder and 0.2g of ferrocene were added to 60ml of acetone, and the controlled rotational speed was 100-1000rpm and stirred for 20-40min, then 2ml of hydrogen peroxide was added, and then ultrasonically dispersed for 20-60min under 300W power to obtain a mixed solution;

[0031] The particle size used above is 140-200nm SiO 2 The dosage of powder, ferrocene, acetone and hydrogen peroxide, according to the particle size of 140-200nm SiO 2 Powder: ferrocene: hydrogen peroxide: acetone is calculated in the ratio of 1mg:4mg:1.2ml:1ml;

[0032] (2), control the temperature of the mixed solution obtained in step (1) to be 170 ° C and carry out the reaction for 72 h, and the o

[0036] Example 2

[0037] An adsorbent that can recover heavy metal ions has a core-shell structure, wherein the core is SiO 2 , the shell is Fe 3 O 4 C, which is prepared by a method comprising the steps of:

[0038] (1) At room temperature, 50 mg of SiO with a particle size of 180 nm was 2 The powder and 0.1g of ferrocene were added to 40ml of acetone, and the controlled rotational speed was 100-1000rpm and stirred for 20-40min, then 2ml of hydrogen peroxide was added, and then ultrasonically dispersed for 40min under 300W power to obtain a mixed solution;

[0039] The particle size used above is 140-200nm SiO 2 The dosage of powder, ferrocene, acetone and hydrogen peroxide, according to the particle size of 140-200nm SiO 2 Powder: ferrocene: hydrogen peroxide: acetone is calculated in the ratio of 1mg:2mg:0.8ml:1ml;

[0040] (2), control the temperature of the mixed solution obtained in step (1) to be 170-180 °C and carry out the reaction for 48 hours, and the obta

[0048] Example 3

[0049] An adsorbent that can recover heavy metal ions has a core-shell structure, wherein the core is SiO 2 , the shell is Fe 3 O 4 C, which is prepared by a method comprising the steps of:

[0050] (1) At room temperature, 50 mg of SiO with a particle size of 200 nm was 2 The powder and 0.4g of ferrocene were added to 50ml of acetone, and the controlled rotational speed was 100-1000rpm and stirred for 20-40min, then 2ml of hydrogen peroxide was added, and then ultrasonically dispersed for 60min under 300W power to obtain a mixed solution;

[0051] The particle size used above is 140-200nm SiO 2 The dosage of powder, ferrocene, acetone and hydrogen peroxide, according to the particle size of 140-200nm SiO 2 Powder: ferrocene: hydrogen peroxide: acetone is calculated in the ratio of 1mg:8mg:1ml:1ml;

[0052] (2), control the temperature of the mixed solution obtained in step (1) to be 200 ° C and carry out the reaction for 24 h, and the obtained reac