摘要
为实现重金属污染土壤的高效、环保修复,采用慢氧限制热解法制备生物炭-坡缕石复合材料(BC/PAL)。考察BC/PAL对土壤理化性质、Cd的浸出毒性和在土壤中的赋存形态、玉米生长状况及Cd的富集转运影响,从而评价该材料对土壤中Cd的潜在生态风险改善及稳定效果。结果表明,添加BC/PAL后土壤pH显著增加,当投加量为8%时,pH较对照组(CK)升高1.14。当BC/PAL投加量为6%和8%时,土壤中Cd的毒性特征浸出程序(TCLP)浸出毒性较CK下降60%以上。添加BC/PAL后,Cd在土壤中的赋存状态从活泼趋于稳定。BC/PAL可减轻Cd对玉米的胁迫,促进玉米生长,当投加量为6%时,玉米鲜重增加221.43%。BC/PAL大大降低了土壤中Cd的潜在生态风险及生物有效性,是一种高效、环保的土壤修复材料。
In order to achieve efficient and environmentally friendly remediation of soil contaminated by heavy metal,the biochar-palygorskite composites(BC/PAL)were synthesised by slow oxygen limited pyrolysis.The effects of BC/PAL addition on soil physical and chemical properties,leaching toxicity and fraction of Cd in soil,growth status of maize and enrichment and transport of Cd in crop were investigated,so as to evaluate the potential ecological risk and stabilization effect of Cd in soil after repaired by BC/PAL.The results showed that soil pH increased significantly after adding BC/PAL.Compared with CK,pH increased by 1.14 at the dosage of 6%.When the dosages of BC/PAL were 6%and 8%,the TCLP leaching toxicity of Cd in soil was more than 60%lower than that of CK.After the addition of BC/PAL,the speciation of Cd in soil transformed from active state to stable state.Meanwhile,it reduced the stress of Cd on maize and promoted the growth of crop.When the dosage was 6%,the fresh weight of corn increased by 221.43%.BC/PAL reduced the potential ecological risk and bioavailability of Cd in soil significantly.It was an efficient and environmentally friendly soil remediation material.
作者
米璇
黄娜
张鸣
段凯苗
朱亚丽
张泽恩
Mi Xuan;Huang Na;Zhang Ming;Duan Kaimiao;Zhu Yali;Zhang Zeen(College of Urban Environment,Lanzhou City University,Lanzhou,Gansu 730070;Jiuquan City Ecological Environment Comprehensive Affairs Center,Jiuquan,Gansu 735000)
出处
《非金属矿》
2024年第2期103-107,共5页
Non-Metallic Mines
基金
兰州城市学院博士科研基金(LZCU-BS2023-02)
甘肃省高等学校科研项目(2023B-147)。
