酸碱改性木质活性炭对棕榈油中3-MCPD酯的吸附脱除效果
Adsorptive removal efficiency of 3-MCPD esters from palm oil by acid-base modified wood-activated carbon
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摘要: 以精炼棕榈油为研究对象,研究4种碳纳米吸附剂(木质活性炭粉末、椰壳活性炭粉末、煤质活性炭粉末和多壁碳纳米管)对3-氯丙醇(3-MCPD)酯的吸附脱除效果,并对最佳吸附剂进行酸碱改性,探究改性后吸附剂添加量、吸附时间和吸附温度对棕榈油中3-MCPD酯吸附脱除效果的影响。结果表明:对3-MCPD酯的脱除效果为木质活性炭粉末>多壁碳纳米管>椰壳活性炭粉末>煤质活性炭粉末,整体脱除效果欠佳;经4 mol/L H3PO4改性后的木质活性炭粉末,吸附性能增强,在吸附剂添加量为5.85% 、吸附时间为47 min、吸附温度为103 ℃的最佳吸附条件下,对棕榈油中3-MCPD酯的脱除率可达71.82% 。使用H3PO4改性木质活性炭可作为脱除食用油中3-MCPD酯的一个有效方法。Abstract: The adsorptive removal effects of four adsorbents (wood-activated carbon powder, coconut shell-activated carbon powder, coal-activated carbon powder, and multi-walled carbon nanotubes) on 3-monochloropropane-1,2-diol (3-MCPD) esters were probed using refined palm oil as the research object. And acid-base modification was carried out on the optimum adsorbent to investigate the effects of adsorbent addition amount, adsorption time, and adsorption temperature on the adsorptive removal efficiency of 3-MCPD esters in palm oil. The results showed that the removal efficiency of 3-MCPD esters was as follows: wood-activated carbon powder >multi-walled carbon nanotubes>coconut shell-activated carbon powder >coal-activated carbon powder, but the overall removal effects were poor. The adsorption performance of the wood-activated carbon powder modified with 4 mol/L H3PO4 was improved. Under the optimal adsorption conditions of 5.85% addition, 47 min, and 103 ℃, the removal efficiency of 3-MCPD esters from palm oil could reach 71.82% . Wood-activated carbon modified by H3PO4 could be an effective strategy for the removal of 3-MCPD esters from edible oil.
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Key words:
- wood-activated carbon /
- acid-base modification /
- palm oil /
- 3-MCPD ester /
- adsorptive removal
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