生态与农村环境学报2012，Vol.28Issue(6)：712-717,6.
4种温度条件下制备的稻草炭对环丙氨嗪的吸附特征
Adsorption of Cyromazine by Rice Straw-Based Biochars Different in Pyrolyzation Temperature
摘要
Abstract
Rice straw was pyrolyzed into biochar at four different temperatures (200, 400, 600, and 800 ℃ ). Mineral structure, surface properties and elemental composition of the biochars were analyzed with the aid of XRD, FTIR and SEM/EDS, and characteristics of the biochars adsorbing cyromazine in wastewater were studied, so as to provide some references for treatment of cyromazine-containing wastewater and utilization of crop straws as resource. Results show that the biochars contain mineral crystals, like quartz, calcite and potassium chloride, and some major elements, like C, O and Si; They were porous in structure and rich in oxygen-containing functional group. Biochars prepared at 600 ℃ or more in pyrolyzation were higher in specific surface area and their adsorption of cyromazine significantly higher, too. Fitting with Langmuir equation showed that the maximum cyromazine adsorption capacity of the biochar prepared at 200, 400, 600 and 800 ℃ of pyrolyzation temperature was 4 200 and 6 365 , 144 865 and 167 084 mg · kg-1 , respectively, of which the last two were quite close to that of the commodity activated carbon (177 305 mg · kg-1) , and 16. 8 and 20. 1 times as high as that of the equivalent amount of rice straw. The kinetic curve of biochar adsorbing cyromazine fitted well the first order kinetics equation. In solution with the initial concentration of cyromazine being 100 and 200 mg · L-1 , it took the biochars produced at 600 and 800 ℃ about 5 and 8 hours, respectively, to reach equilibrium in cyromazine adsorption. In solutions, 500 mg · L in initial concentration of cyromazine, 5 - 10 in pH and 1 — 100 mmol · L-1 NaNO3 in supportive e-lectrolyte, no significant effects of pH value and ion strength were observed on the adsorption of cyromazine by the biochar produced at 600 and 800 ℃.关键词
稻草炭/表面性质/吸附/环丙氨嗪Key words
rice straw based biochar/surface property/adsorption/cyromazine分类
资源环境引用本文复制引用
袁敏,姜军,赵安珍,徐仁扣..4种温度条件下制备的稻草炭对环丙氨嗪的吸附特征[J].生态与农村环境学报,2012,28(6):712-717,6.基金项目
国家科技支撑计划(2012BAJ24B06) （2012BAJ24B06）
