| 曹美珠,潘丽萍,张超兰,杨惟薇,魏嘉鸣,张飞龙,韦艳红.四种生物质炭的表面特性及其对水溶液中镉-阿特拉津的吸附性能研究[J].农业环境科学学报,2014,33(12):2350-2358. |
| 四种生物质炭的表面特性及其对水溶液中镉-阿特拉津的吸附性能研究 |
| Surface Characteristics of Four Biochars and Their Adsorption of Cd and Atrazine in Aqueous Solution |
| 投稿时间：2014-05-24 |
| DOI：10.11654/jaes.2014.12.011 |
| 中文关键词: 生物质炭 热解 吸附 镉 阿特拉津 |
| 英文关键词: biochar pyrolysis adsorption cadmium atrazine |
| 基金项目:国家自然科学基金项目(41461091);广西自然科学基金项目(2014GXNSFAA18039);广西有色金属及特色材料加工重点实验室项目(GXKFJ12-15);广西大学科研基金项目(XJZ130367) |
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| 中文摘要: |
| 选用甘蔗叶、木薯杆、水稻秸秆和蚕沙作为原料,分别在300、700 ℃下限氧控温热解制备生物质炭,采用电镜扫描(SEM)观察生物质炭表面孔隙结构,用红外光谱( FTIR)、Boehm 滴定方法对表面官能团的种类和含量进行分析,并研究不同生物质炭在不同镉(Cd)-阿特拉津(AT)初始浓度、不同pH值下对Cd、AT的吸附特征.结果发现,同种原材料制备的生物质炭,高温条件(700 ℃)热解与低温(300 ℃)相比,表面的官能团数量较少,但孔隙结构更加明显.不同生物质炭对Cd和AT 的吸附符合准二级动力学方程,拟合系数均大于0.998.生物质炭能有效吸附水溶液中的Cd和AT,初始浓度越大,吸附量越大,且高温炭的单位吸附量大于低温炭.相同材料制备的生物质炭在溶液pH=6时对Cd的吸附量高于pH=4时的吸附量,而对AT的吸附能力则是在低pH值时较大.高温制备的水稻秸秆炭和蚕沙炭对Cd的吸附效果较明显,甘蔗叶炭对AT的吸附量最大. |
| 英文摘要: |
| Biochars have recently been used to remediate water contaminated by heavy metals and organic pollutants. In this paper, four biochars derived from organic wastes(sugarcane top, cassava stem, rice straw and silkworm excrement) collected from Guangxi were selected to examine their pore structure by Scanning Electron Microscope(SEM), type and quantity of total oxygen-containing functional groups via Fourier Transform Infrared Spectroscopy(FTIR) and Boehm titration, and adsorption characteristics of Cd2+ and atrazine(AT) at different initial concentrations of Cd and AT and different pH values. Biochars obtained at high pyrolytic temperature(700 ℃) had more pores and basic functional groups but fewer acid functional groups than those at low pyrolytic temperature(300 ℃). The adsorption of Cd and AT by the biochars could be well characterized with pseudo-second-order kinetic model. The Cd and AT adsorption increased with initial concentrations of Cd and AT. The adsorption efficiencies of Cd and AT were greater for biochars at 700 ℃ than 300 ℃. Biochars adsorbed more Cd but less AT at pH 6 than pH 4. Rice straw- and silkworm excrement-derived biochars had greater adsorption capacity for Cd2+, while sugarcane top derived-biochar had more adsorption for AT. |
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