LIU Yanli,ZHOU Beibei,WANG Quanjiu,et al.Effects of Nano-carbon on the Migration of Cu(Ⅱ) in Loessal Soil[J].Research of Soil and Water Conservation,2016,23(01):62-66.
纳米碳对黄绵土Cu (Ⅱ)迁移影响的研究
- Title:
- Effects of Nano-carbon on the Migration of Cu(Ⅱ) in Loessal Soil
- Keywords:
- nano-carbon; Cu (Ⅱ); the cumulative infiltration; the wetting front; isothermal adsorption curve
- 分类号:
- S153
- 摘要:
- 重金属污染治理对改善环境污染具有重要意义，基于室内扰动土柱试验，以黄绵土为研究对象，初步研究了在黄绵土中均匀混合及在表层混合不同含量纳米碳材料对土壤中重金属Cu（Ⅱ）迁移过程的影响。结果表明：（1）相同平衡浓度，随着纳米碳含量的增加，Cu（Ⅱ）吸附量加大，采用Langmuir方程拟合Cu（Ⅱ）等温吸附曲线，最大吸附量（Sm）随着纳米碳含量增加而增大。（2）对于均匀混合纳米碳的黄绵土和仅表层混有纳米碳的黄绵土，Philip方程均能较好地描述Cu（NO3）2溶液累积入渗量变化过程，湿润锋推进过程遵循幂函数变化。（3）随着纳米碳含量增加，Cu（NO3）2溶液累积入渗量降低，纳米碳含量较低时（0.1%，0.5%，1%），两种纳米碳添加方式对土壤累积入渗量的影响差异不大，纳米碳含量较高时（5%），均匀添加纳米碳土壤的累积入渗量曲线则显著低于表层添加纳米碳的土壤。（4）相对于空白对照土壤，两种施碳方式均提高了土壤表层Cu（Ⅱ）含量，且表层Cu（Ⅱ）含量明显高于深层土壤。纳米碳含量为0.1%，0.5%，1%时，两种添加纳米碳方式之间表层土壤Cu（Ⅱ）含量无明显差异，当纳米碳含量上升到5%时，均匀添加纳米碳土柱的表层土壤Cu（Ⅱ）含量显著高于表层添加纳米碳土柱，随着土壤剖面加深，不同处理土壤剖面处Cu（Ⅱ）含量无明显差异。因此，纳米碳对重金属Cu（Ⅱ）有很好的吸附作用，且在土壤表层添加纳米碳是一种经济有效的施碳方式。
- Abstract:
- Heavy metal pollution management is very important for the environmental improvement. Based on the disturbed one-dimensional soil column experiments, effect of nano-carbon on Cu (Ⅱ) migration process was studied in the lab. The main results showed as follows. (1)At the same equilibrium concentration, with the increase of nano-carbon contents, the Cu(Ⅱ) adsorption quantity increased. The maximum adsorption (Sm) fitted by the Langmuir equation was increased with the increase of nano-carbon contents. (2) Philip Formula could better describe the Cu(NO3)2 solution infiltration process for all the soil columns mixed well with the nano-carbon and nano-carbon applied at the top soil, as well as the wetting front advance curve followed the power function. (3) Cu(NO3)2 solution infiltration amount was reduced with the increase of nano-carbon content, while nano-carbon contents were low (0.1%, 0.5%, 1%), little effect on the cumulative infiltration was found between the nano-carbone mixed well with the soil and the nano-carbon applied at the subsurface. But when the nano-carbon content was as high as 5%, the variation was obvious, of which the nano-carbon mixed well with soil was significantly smaller. (4) Compared with the control soil, the nano-carbon could reduce the soil Cu(Ⅱ) content with these two methods and Cu(Ⅱ) contents in the surface soil were obviously higher than those in the deep soil. While nano-carbon content was low (0.1%, 0.5%, 1%), the difference of surface soil was small and little effect on the Cu(Ⅱ) content was found between the nano-carbon mixed well with the soil and the nano-carbon applied at the subsurface, while nano-carbon content was high (5%), the Cu(Ⅱ) content of surface soil of nano-carbon mixed with soil was significantly higher than that treated with nano-carbon applied at the top soil, but the Cu(Ⅱ) content in deeper soil presented little difference. As a result, nano-carbon has a good adsorption effect to Cu(Ⅱ), furthermore, nano-carbon applied at the top soil is an economic and effective way to absorb more Cu(Ⅱ).
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备注/Memo
收稿日期:2015-06-25;改回日期:2015-08-12。
基金项目:国家自然科学基金重点项目（51239009）；国家自然科学基金面上项目（41371239）；陕西省科技支撑项目（2013KJXX-38）；陕西省水利专项支撑计划（2012slkj-04；2013Slkj-04）
作者简介:刘艳丽(1990-),女,陕西西安人,在读研究生,主要研究方向:农业水土资源与生态环境。E-mail:liuyanli0507@163.com
通讯作者:周蓓蓓(1982-),女,陕西西安人,博士,副教授,主要研究方向:农业水土与生态环境。E-mail:happyangle222@gmail.com