为了探究来源于本地农业废弃物的生物炭对区域重金属污染黄土吸附固定化修复的可行性,本文采用批量平衡实验法,研究了马铃薯秸秆生物炭、黄土和生物炭与黄土混合物(加炭黄土)吸附重金属Cd(Ⅱ)的性能,考察了吸附时间、初始Cd(Ⅱ)浓度和溶液pH值对吸附过程的影响,并利用红外光谱、X,射线衍射分析等方法对吸附前后的生物炭和黄土分别进行表征.结果表明,生物炭、黄土、加炭黄土对Cd(Ⅱ)的吸附等温模式符合Langmuir模型,在25℃下的最大吸附量分别为15.60、7.87、12.40 mg·g-1,吸附动力学数据满足准二级动力学方程,溶液初始pH值对Cd(Ⅱ)的吸附过程影响较大,2＜pH＜4和6＜pH＜8时,吸附量增加速率很快,而4＜pH＜6时,吸附量平缓上升.表征结果说明离子交换和阳离子-π作用为生物炭对Cd(Ⅱ)的主要吸附机制,而黄土对Cd(Ⅱ)的吸附主要归因于石英、高岭石等黏土矿物以及有机质中的羧基基团.对比动力学和等温吸附数据可得,在实验研究范围内,生物炭的添加使黄土对Cd(Ⅱ)的吸附能力分别提高了41.50％和49.94％.因此,在一定条件下,生物炭的输入可有效提高黄土对Cd(Ⅱ)的吸附固定化能力.
参考文献
| [1] | Minori Uchimiya;Desmond I. Bannon.Solubility of Lead and Copper in Biochar-Amended Small Arms Range Soils: Influence of Soil Organic Carbon and pH[J].Journal of Agricultural and Food Chemistry,201332(32):7679-7688. |
| [2] | Hua Hua Miao;Wen He;Xue Song Wang.Competitive Adsorption of Pb(II), Cu(II), and Cd(II) Ions on Wheat-Residue Derived Black Carbon[J].Journal of Chemical and Engineering Data: the ACS Journal for Data,20113(3):444-449. |
| [3] | Sandeep Kumar;Reginald Ebhin Masto;Lal C. Ram.Biochar preparation from Parthenium hysterophorus and its potential use in soil application[J].Ecological engineering: The Journal of Ecotechnology,2013:67-72. |
| [4] | Regmi, P.;Moscoso, J. L. G.;Kumar, S.;Cao, X. Y.;Mao, J. D.;Schafran, G..Removal of copper and cadmium from aqueous solution using switchgrass biochar produced via hydrothermal carbonization process.[J].Journal of Environmental Management,2012:61-69. |
| [5] | Kolb, Simone E.;Fermanich, Kevin J.;Dornbush, Mathew E..Effect of Charcoal Quantity on Microbial Biomass and Activity in Temperate Soils[J].Soil Science Society of America Journal,20094(4):1173-1181. |
| [6] | G. Fellet;L. Marchiol;G. Delle Vedove;A. Peressotti.Application of biochar on mine tailings: Effects and perspectives for land reclamation[J].Chemosphere: Environmental toxicology and risk assessment,20119(9):1262-1267. |
| [7] | Effects of biochar and greenwaste compost amendments on mobility, bioavailability and toxicity of inorganic and organic contaminants in a multi-element polluted soil[J].Environmental Pollution,20106(6):p.2282. |
| [8] | 尚婷婷;赵保卫;马锋锋;晏丽娟;黄丽萍.胡麻秸秆生物炭、黄土及加炭黄土吸附Cu（Ⅱ）的特性研究[J].兰州交通大学学报,2015(3):145-152. |
| [9] | 赵杰 .笋壳炭的制备和表征及其在土壤改良中的应用研究[D].厦门大学,2014. |
| [10] | K. Kadirvelu;M. Kavipriya;C. Karthika.Mercury (II) adsorption by activated carbon made from sago waste[J].Carbon: An International Journal Sponsored by the American Carbon Society,20044(4):745-752. |
| [11] | 李力;陆宇超;刘娅;孙红文;梁中耀.玉米秸秆生物炭对Cd（Ⅱ）的吸附机理研究[J].农业环境科学学报,2012(11):2277-2283. |
| [12] | 石夏颖;赵保卫;马锋锋;张杰西.油菜（Brassica campestris L．）秸秆生物炭对 Cr（Ⅵ）的吸附研究[J].兰州交通大学学报,2014(3):26-30. |
| [13] | 唐行灿;张民.生物炭修复污染土壤的研究进展[J].环境科学导刊,2014(1):17-26. |
| [14] | 刘晶晶;唐晓武;王艳.Pb（Ⅱ）、Cu（Ⅱ）、Cd（Ⅱ）在黄土上二元竞争吸附特性研究[J].岩土工程学报,2014(2):327-333. |
| [15] | 安增莉;侯艳伟;蔡超;薛秀玲.水稻秸秆生物炭对Pb（Ⅱ）的吸附特性[J].环境化学,2011(11):1851-1857. |
| [16] | 徐楠楠;林大松;徐应明;谢忠雷;梁学峰;郭文娟.玉米秸秆生物炭对Cd2+的吸附特性及影响因素[J].农业环境科学学报,2014(5):958-964. |
| [17] | Hichem Smaoui;Hajer Guermazi;Serge Agnel;Youssef Mlik;Alain Toureille;Francois Schue.Structural changes in epoxy resin polymer after heating and their influence on space charges[J].Polymer international,20038(8):1287-1293. |
| [18] | 范春辉;贺磊;张颖超;王家宏;马宏瑞.西北旱作农田黄土指纹图谱的光谱学鉴定[J].光谱学与光谱分析,2013(6):1697-1700. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%