A method for removing heavy metals from sea cucumbers by using modified attapulgite composite chelating resin
A technology for modifying attapulgite and chelating resin, applied in chemical instruments and methods, other chemical processes, food science and other directions, can solve problems such as inability to effectively remove heavy metals in sea cucumbers, and achieve more effective adsorption sites and adsorption balance. The effect of short time and low adsorption limit concentration
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Embodiment 1
[0013] A kind of method utilizing modified attapulgite composite chelating resin to remove sea cucumber heavy metals, it goes through the following process steps:
[0014] (1) Preparation of attapulgite-chelating resin: take by weight 9 parts of pretreated attapulgite and 30 parts of D405 chelating resin in a three-necked bottle, add 20 parts, concentration of 3mol / L HCL solution, heated and boiled, ultrasonically oscillated for 1 hour, the ultrasonic frequency was controlled to 30KHZ, the speed of the centrifuge was controlled to 5000r / min, centrifuged for 20 minutes, the supernatant was removed, and the precipitate was washed with deionized water until the pH value was 7, at 75°C Dry for 7 hours, pass through a 100-mesh sieve after crushing, and place in a desiccator to obtain attapulgite-chelating resin; wherein, the pretreatment of attapulgite is to soak attapulgite with 75% ethanol for 12 hours, and wash with distilled water clean;
[0015] (2) Preparation of attapulgite...
Embodiment 2
[0018] A kind of method utilizing modified attapulgite composite chelating resin to remove sea cucumber heavy metals, it goes through the following process steps:
[0019] (1) Preparation of attapulgite-chelating resin: take 5 parts by weight of pretreated attapulgite and 40 parts of D405 chelating resin in a three-necked bottle, add 15 parts of 4mol / L HCL solution, heated and boiled, ultrasonically oscillated and shaken for 1.5h, the ultrasonic frequency was controlled to 20KHZ, the centrifuge speed was controlled at 6000r / min, centrifuged for 15min, the supernatant was removed, the precipitate was washed with deionized water until the pH value was 6, at 80°C Dry it for 6 hours, pass through a 120-mesh sieve after crushing, and place it in a desiccator to obtain attapulgite-chelating resin; wherein, the pretreatment of attapulgite is to soak attapulgite with 80% ethanol for 10 hours, and use distilled water clean up;
[0020] (2) Preparation of attapulgite-chelating resin aq...
Embodiment 3
[0023] A kind of method utilizing modified attapulgite composite chelating resin to remove sea cucumber heavy metals, it goes through the following process steps:
[0024] (1) Preparation of attapulgite-chelating resin: take 15 parts by weight of pretreated attapulgite and 20 parts of D405 chelating resin in a three-necked bottle, add 25 parts, concentration of 2mol / L HCL solution, heated and boiled, ultrasonically oscillated for 0.5h, the ultrasonic frequency was controlled to 48KHZ, the speed of the centrifuge was controlled to 5000r / min, centrifuged for 30min, the supernatant was removed, the precipitate was washed with deionized water until the pH value was 8, at 70°C Dry for 8 hours, pass through a 80-mesh sieve after crushing, and place in a desiccator to obtain attapulgite-chelating resin; wherein, the pretreatment of attapulgite is to soak attapulgite with 60% ethanol for 15 hours, and then use distilled water clean up;
[0025] (2) Preparation of attapulgite-chelatin...
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