| 多孔SBA-15颗粒对Cd(Ⅱ)的吸附缝合及其对土壤Cd(Ⅱ)的修复潜力 |
| 摘要点击 2515 全文点击 1087 投稿时间：2016-07-19 修订日期：2016-08-23 |
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| 中文关键词 SBA-15 Cd(Ⅱ) 吸附缝合 污染土壤 XRD |
| 英文关键词 SBA-15 Cd(Ⅱ) adsorption and sealing contaminated soil XRD |
| 作者 | 单位 | E-mail | | 黄辉 | 西北农林科技大学资源环境学院, 杨凌 712100 | huanghui1292@163.com | | 宁西翠 | 杨凌农业高新技术产业示范区环境监测站, 杨凌 712100 | | | 郭瞻宇 | 西北农林科技大学资源环境学院, 杨凌 712100 | | | 郭堤 | 西北农林科技大学资源环境学院, 杨凌 712100 | | | 张增强 | 西北农林科技大学资源环境学院, 杨凌 712100
农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | | | 李荣华 | 西北农林科技大学资源环境学院, 杨凌 712100
农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | rh.lee@nwsuaf.edu.cn | | 王力 | 西北农林科技大学资源环境学院, 杨凌 712100 | | | Ali Amjad | 西北农林科技大学资源环境学院, 杨凌 712100 | |
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| 中文摘要 |
| 为拓展多孔硅酸盐等矿物材料在钝化土壤重金属中的应用，以Na2SiO3为硅源，制备了二氧化硅多孔材料SBA-15，用透射电镜、X射线衍射、氮气吸附-解吸和红外光谱等手段对其结构进行了表征，并在此基础上，以批试验法研究了SBA-15对Cd（Ⅱ）吸附特征和缝合性能，并通过小青菜盆栽试验法探讨了其对土壤Cd的钝化潜力.结果表明，合成的SBA-15具有规则中孔特征，比表面积507.3 m2·g-1，孔径7.38 nm；体系pH≥7.0时，在100 mg·L-1的Cd（Ⅱ）溶液中SBA-15的最大吸附量可达76.43 mg·g-1，吸附过程可用Langmuir模型描述，增加介质离子强度对Cd（Ⅱ）的吸附具有抑制作用.吸附Cd（Ⅱ）后的SBA-15可以用0.1 mol·L-1 HNO3进行再生，但当向吸附Cd（Ⅱ）的SBA-15中引入Na2SiO3后，可以通过SBA-15的孔隙缝合有效地固定被吸附的Cd（Ⅱ），从而抑制Cd（Ⅱ）向环境中释放.小青菜盆栽试验表明，SBA-15对Cd（Ⅱ）污染土壤的改良效果明显，能有效地降低土壤有效态Cd（Ⅱ）的含量，促进土壤Cd水溶态和交换态向碳酸盐和铁锰氧化物结合态及残渣态的转化，抑制Cd（Ⅱ）在小青菜体内的积累，增加小青菜产量.研究表明，利用SBA-15的吸附缝合能力以SBA-15和Na2SiO3配合使用，是进行土壤中Cd修复的有效方法. |
| 英文摘要 |
| Aiming to expand the utilization of porous silicate minerals in the remediation of heavy metal contaminated soil,the mesoporous material SBA-15 was successfully synthesized by using sodium silicate as silica source in this study.And the obtained SBA-15 samples were characterized by TEM,X-ray diffraction,N2 adsorption-desorption and FTIR.Furthermore,characterization of Cd (Ⅱ) adsorption and sealing performance onto SBA-15 were evaluated through batch experiment,and the remediation potential of Cd (Ⅱ) contaminated soil was investigated by brassica planting in a pot experiment.The results showed that SBA-15 had the mesoporous structure with surface area of 507.3 m2·g-1 and pore size of 7.38 nm.The maximum Cd (Ⅱ) adsorption capacity was 76.43 mg·g-1 at pH above 7.0 with the adsorption isotherm fitting the Langmuir model in the solution of 100 mg·L-1 Cd (Ⅱ).The increase in ionic strength reduced the Cd (Ⅱ) adsorption capacity.The Cd (Ⅱ) loaded SBA-15 could be regenerated with 0.1 mol·L-1 HNO3,while Cd (Ⅱ) could be strongly sealed in the pore structure after introduction of sodium silicate into the system.The pot experiment proved that the addition of SBA-15(4.5 g·kg-1) into Cd-contaminated soil could reduce Cd (Ⅱ) availability,enhance the transformation of soluble and exchangeable Cd (Ⅱ) fractions into carbonate and Fe-Mn oxides bounded forms,inhibit the Cd (Ⅱ) accumulation in the plant tissue and improve the brassica growth.Based on these results,it can be concluded that combination of the SBA-15 particle with sodium silicate has great potential to remediate Cd (Ⅱ) contaminated soil through adsorption and sealing properties. |
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