| 赵航航,杨阳,黄训荣,张贵宾,李竞天,吉普辉.低温改性粉煤灰对土壤镉的钝化修复研究[J].农业环境科学学报,2018,37(8):1642-1650. |
| 低温改性粉煤灰对土壤镉的钝化修复研究 |
| Remediation effects of a new type of low-temperature-modified fly ash on Cd-contaminated soil |
| 投稿时间：2017-12-23 |
| DOI：10.11654/jaes.2017-1750 |
| 中文关键词: 镉 粉煤灰 低温改性 钝化 |
| 英文关键词: cadmium fly ash low-temperature modified immobilization |
| 基金项目:农业部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室开放基金课题（17nybcdgj） |
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| 摘要点击次数: 1862 |
| 全文下载次数: 1969 |
| 中文摘要: |
| 粉煤灰（FA）通过低温碱改性制备中间体（IP）和沸石（ZE）。利用扫描电镜-能谱仪（SEM-EDS）、X射线荧光分析（XRF）、比表面积（BET）、零点电荷（pHzpc）等对FA、IP和ZE 3种钝化剂进行表征，通过盆栽试验研究不同投加梯度下3种钝化剂对土壤pH和有效态镉（Cd）含量、印度芥菜（Brassica juncea）生物量及各部位Cd含量的影响，探究3种钝化剂对土壤Cd的钝化机理。结果表明：3种钝化剂均能显著降低土壤中有效态Cd含量和印度芥菜地上部Cd含量，1.5%添加用量IP和ZE可使有效态Cd含量降低48.35%和46.19%、印度芥菜地上部Cd含量降低37.51%和41.06%。施入1.5%的IP和ZE使土壤pH显著提高0.59和0.62个单位、印度芥菜生物量提高20%。由此可见，IP和ZE均可有效降低污染土壤中有效态Cd含量并促进作物生长。从经济角度考虑，IP的制备对FA的长期利用更有一定的经济价值。 |
| 英文摘要: |
| A new intermediate and zeolite were made from fly ash under low-temperature and alkali conditions. FA、IP and ZE three materials were characterized by canning electron microscope-energy dispersive spectromet(SEM-EDS), X-ray fluorescence(XRF), BrunauerEmmett-Teller(BET), zero point of charge(pHzpc), etc. analyses. The effects of FA, IP and ZE three immobilizing agents on soil pH, available Cd in soil, mustard biomass, and heavy metal concentration of mustard were investigated using pot experiments. The possible immobilization mechanism of Cd was elucidated. The results showed that application of the three immobilizing agents resulted in reduction of the content of bioavailable Cd in soils and a decrease in the amount of Cd in mustard. Moreover, the available Cd decreased by 48.35% and 46.19%, respectively, after 1.5% IP and ZE passivators were added in the soils, and the content of Cd in the upper part of India mustard reduced by 37.51% and 41.06%, respectively. The soils pH increased about 0.59 and 0.62 units, respectively, after 1.5% IP and ZE passivators were added in the soils, and the biomass of mustard increased 20%. Thus, the IP and ZE passivating agents effectively reduced the available Cd and promoted growth of the crops. In economic terms, the IP had certain economic value for the long-term utilization of fly ash. |
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