文章摘要
陶玲,管天成,刘瑞珍,何静,尚倩倩,任珺.热改性坡缕石对土壤Cd污染的钝化修复研究[J].农业环境科学学报,2021,40(4):782-790.
热改性坡缕石对土壤Cd污染的钝化修复研究
Stabilization remediation of cadmium contaminated soil by using heat-modified palygorskite
投稿时间:2020-09-23  
DOI:10.11654/jaes.2020-1115
中文关键词: 坡缕石  热改性  钝化  镉(Cd)  土壤
英文关键词: palygorskite  heat-modified  stabilization  cadmium(Cd)  soil
基金项目:国家自然科学基金项目(51668034,31560234);兰州交通大学大学生创新创业项目(2020064,2020069)
作者单位E-mail
陶玲 兰州交通大学环境与市政工程学院环境生态研究所, 兰州 730070
甘肃瀚兴环保科技有限公司, 兰州 730070
甘肃省黄河水环境重点实验室, 兰州 730070 
 
管天成 兰州交通大学环境与市政工程学院环境生态研究所, 兰州 730070  
刘瑞珍 山东省烟台市森林资源监测保护服务中心, 山东 烟台 264000  
何静 兰州交通大学环境与市政工程学院环境生态研究所, 兰州 730070  
尚倩倩 兰州交通大学环境与市政工程学院环境生态研究所, 兰州 730070  
任珺 兰州交通大学环境与市政工程学院环境生态研究所, 兰州 730070
甘肃瀚兴环保科技有限公司, 兰州 730070
甘肃省黄河水环境重点实验室, 兰州 730070 
renjun@mail.lzjtu.cn 
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中文摘要:
      为探讨不同热解温度下的坡缕石对土壤中重金属Cd的钝化效果,将坡缕石颗粒分别在250、300、350、400、450℃条件下热解2.5 h,将其施用于重金属Cd污染土壤中,进行钝化试验和盆栽试验来判断对Cd污染土壤的钝化效果。结果表明:添加不同温度的热改性坡缕石均不同程度地提高了土壤pH、EC和CEC,使DTPA和TCLP提取态Cd含量显著降低,在添加350℃的热改性坡缕石钝化土壤时,两种提取态Cd含量降幅最大,分别为39.7%和32.6%。添加350℃的热改性坡缕石可以促进Cd由活性高的酸溶态向活性低的残渣态转化,从而有效降低Cd的迁移能力。添加热改性坡缕石有助于玉米植株的生长,与对照相比,玉米植株的根长、株高、鲜质量和干质量都有显著的增高,同时Cd从土壤到地上部分的富集和地下部分到地上部分的转运有了明显的降低。因此,热改性坡缕石可作为钝化修复重金属污染土壤的环保材料。
英文摘要:
      In order to investigate the stabilization effect of palygorskite at different pyrolysis temperatures on cadmium(Cd) in soil, palygorskite particles were pyrolyzed at 250, 300, 350, 400℃, and 450℃ for 2.5 h. The stabilization effect of Cd contaminated soil was evaluated by a stabilization experiment and pot experiment. The results showed that the pH, electrical conductivity, and cation exchange capacity of the soil were increased by adding palygorskite at different temperatures, and the concentration of extractable Cd in DTPA and TCLP decreased significantly, When the heat-modified palygorskite at 350℃ was added to stabilize the soil, the concentration of Cd in the two extraction states decreased the most, by 39.7% and 32.6%, respectively. The addition of 350℃ heat-modified palygorskite could promote the transformation of Cd from an acid soluble state with high activity to a residual state with low activity, thus effectively reducing the mobility of Cd. Palygorskite enhanced the growth of corn plants. Compared with the control, the root length, plant height, fresh weight, and dry weight of corn plants significantly increased, and the accumulation of Cd from soil to aboveground parts and the transportation of Cd from underground to aboveground parts were significantly reduced. Therefore, heat-modified palygorskite can be used as an environmental protection material for the stabilization and remediation of heavy metal contaminated soil.
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