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高岭土负载纳米铁镍双金属去除水中偶氮染料直接耐晒黑G

Keywords: 纳米铁镍,焙烧高岭土,去除,负载,直接耐晒黑G,偶氮染料

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Abstract:

采用液相还原法制备焙烧高岭土负载纳米铁镍双金属(CK-Fe/Ni)。考察了在不同条件下,如pH、投加量、初始浓度、温度等,对负载型纳米铁镍双金属降解水中偶氮染料直接耐晒黑G的影响及动力学研究。结果表明:在pH=9.49、温度为30℃、负载型纳米铁镍双金属的投加量为1.05g/L、搅拌速度为60r/min,经过20min反应后,负载型纳米铁镍双金属降解水中偶氮染料直接耐晒黑G的去除率达到了99.98%。吸附和电镜表征结果表明,作为载体的焙烧高岭土起着吸附直接耐晒黑G和分散纳米铁镍双金属颗粒的作用导致反应活性提高。降解动力学数据表明,负载型纳米铁镍双金属对直接耐晒黑G的降解过程符合伪一级反应动力学规律,速率常数k随负载型纳米铁镍双金属的投加量的增加而提高,表观活化能为19.72kJ/mol。最后,利用高岭土负载纳米铁镍双金属对废水处理,结果表明,负载型纳米铁镍双金属在实际废水中对直接耐晒黑G的去除率达到了99.98%。

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