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环境化学  2015 

芦苇秸秆生物炭对水体中重金属Ni2+的吸附特性

Keywords: 芦苇生物炭,,等温吸附,吸附动力学,pH

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Abstract:

本实验选用由芦苇秸秆制备的生物炭,通过研究吸附等温线、吸附动力学以及生物炭投加量和溶液pH对生物炭吸附Ni2+的影响,以确定其对水体中Ni2+的吸附特性.结果表明,Ni2+初始浓度在0.5—12mg·L-1范围内,Langmuir模型能很好地描述生物炭对Ni2+的等温吸附规律,其理论饱和吸附量为12.10mg·g-1,与实际饱和吸附量11.93mg·g-1相近.生物炭对Ni2+的吸附动力学过程符合准二级动力学模型,通过颗粒内扩散方程可得具体吸附过程由膜扩散和内扩散共同控制.随投加量增加,生物炭对Ni2+的吸附量下降,而去除率则上升,当投加量>30mg时,Ni2+的去除率接近100%.溶液pH值在1—12范围内,Ni2+的去除率随pH值的升高而增加,当pH>10时,Ni2+的去除率同样接近100%.

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