一种改性生物炭材料的制备及其在土壤污染降解中的应用

Preparation of a modified biochar and its application on soil pollution degradation

针对传统重金属吸附剂生物炭存在吸附能力差的问题,通过羟基磷灰石改性生物炭,并将其用于土壤中重金属离子的去除。实验以美国标准毒性浸出方法TCLP为评价指标,验证改性生物炭对土壤中重金属的净化效果。实验结果表明,改性生物炭材料投加量为8%时,处理的重金属污染土壤符合GB 5085.3-2007标准要求,稳定90d后,pH值仍旧满足适宜土壤微生物生存的6.5~9.5酸碱度要求,表现出良好的降解性能。

In view of the poor adsorption capacity of traditional heavy metal adsorbent biochar,hydroxyapatite modified biochar was proposed to remove heavy metal ions from soil.In this experiment,TCLP,the American Standard toxic leaching method,was used as the evaluation index to verify the purification effect of modified biochar on heavy metals in soil.The test results show that when the dosage of modified biochar is 8%,the treated heavy metal contaminated soil meets the GB 5085.3-2007 standard.After 90 days of stabilization,the pH still meets the pH range of 6.5~9.5,which is suitable for the survival of soil microorganisms,and showing good degradation performance.