以稻壳炭为原料,经镁改性并负载氮磷获得生物炭复合材料鸟粪石@稻壳炭复合材料(MARC),用于吸附废水中的Cr(Ⅵ)。表征结果发现,MARC表面生成鸟粪石,具有丰富的官能团—OH、—COOH、—NH、—PO3-4和Mg—O。在25℃、pH=4.5时,MARC对Cr(Ⅵ)的吸附量达20.14mg/L,低温、低pH的条件有利于吸附的进行。MARC对Cr(Ⅵ)的吸附过程遵循Freundlich模型和伪二级动力学模型,为不均匀表面的多层化学吸附。实验中的生物炭原料源于农业废弃物,提高了资源利用率;氮磷源于含氮磷废水,可以缓解水体富营养化;生成的鸟粪石又可增强吸附Cr(Ⅵ)的能力,可谓“一石三鸟”。
Rice husk biochar was used as the raw material,modified with magnesium and loaded with nitrogen and phosphorus to obtain a composite biochar material,struvite@rice husk biochar composite (MARC),for adsorbing Cr(Ⅵ) in wastewater.The characterization of MARC showed that struvite formed on the surface of MARC,which possessed abundant functional groups including —OH,—COOH,—NH,—PO3-4 and Mg—O.The adsorption capacity of Cr(Ⅵ) by MARC reached 20.14mg/L at 25℃ and pH value of 4.5.The conditions of lower temperature and pH value favored the adsorption.The adsorption process of Cr(Ⅵ) by MARC followed the Freundlich model and the pseudo-second-order model,indicating the multi-layer chemical adsorption of non-uniform surface.“Killing three birds with one stone” tactic was achieved for the simultaneous utilization of agricultural waste as the raw material of biochar to enhance resource utilization,the nitrogen and phosphorus sourced from N-P containing wastewater to alleviate water eutrophication,and the enhancement of the Cr(Ⅵ) adsorption via the generated struvite.
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基金资助
武汉科技大学煤转化与新型炭材料湖北省重点实验室开放基金(WKDM202107)
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