| 刘杰,施胜利,贾月慧,高凡,梁琼,苏世鸣,杨建军,曾希柏,王滔.不同热解温度生物炭对Pb(Ⅱ)的吸附研究[J].农业环境科学学报,2018,37(11):2586-2593. |
| 不同热解温度生物炭对Pb(Ⅱ)的吸附研究 |
| Effect of the pyrolysis temperature on biochar adsorption of Pb2+ |
| 投稿时间：2018-07-11 修订日期：2018-10-22 |
| DOI：10.11654/jaes.2018-0900 |
| 中文关键词: 热解温度 稻壳 棉花秸秆 生物炭 Pb2+ 吸附 |
| 英文关键词: pyrolysis temperature rice husk cotton straw biochar Pb2+ adsorption |
| 基金项目:国家重点研发计划项目（2018YFD0800305）；北京农学院蔬菜产业技术提升协同创新中心资助项目（XT201801） |
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| 中文摘要: |
| 以稻壳（RH）和棉花秸秆（CS）为原料，在300、400、500、600、700℃下制备了生物炭，研究不同添加量、不同初始pH、吸附时间对生物炭吸附水溶液中Pb2+的影响。结果表明：生物炭添加量越大对Pb2+的去除效果越好；热解温度越高，达到同样去除效果所需生物炭的量越少；吸附效果与溶液的pH呈正相关，pH在4~7的范围内，高温生物炭去除Pb2+的效果更好。生物炭对Pb2+的吸附更符合拟二级动力学模型（R2≥0.992），热解温度越高，吸附速率越快，同时中温（500℃）和高温（600、700℃）生物炭对Pb2+的平衡吸附量不低于49.0 mg·g-1。制备稻壳和棉花秸秆生物炭较合适的温度是500℃。 |
| 英文摘要: |
| To investigate the effects of additive amounts, initial pH, and adsorption duration on Pb2+ adsorption, we prepared the biochars from rice husk and cotton straw at 300, 400, 500, 600, and 700℃. The results showed that the amount of Pb2+ adsorbed was gradually enhanced with the increasing rate of biochars and was higher with the higher pyrolysis temperature at the same rate of biochars.The adsorption effect was positively correlated with the pH of the solution and better especially in the range of pH 4~7. The fitting curves of Pb2+ adsorption by biochars were better by the quasi-second-order kinetic model (R2 ≥ 0.992)than the quasi-first-order kinetic model.The higher the pyrolysis temperature, the faster the adsorption rate. Meanwhile, the equilibrium adsorption capacity of Pb2+ by biochars reached no less than 49.0 mg·g-1 at medium temperature (500℃)and high temperature (600℃ and 700℃). The suitable temperature for preparing rice husk and cotton stalks is about 500℃. |
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