| 吴海露,车晓冬,丁竹红,胡忻,陈逸珺.山核桃、苔藓和松针基生物质炭对亚甲基蓝及刚果红的吸附性能研究[J].农业环境科学学报,2015,34(8):1575-1581. |
| 山核桃、苔藓和松针基生物质炭对亚甲基蓝及刚果红的吸附性能研究 |
| Sorption of Methylene Blue and Congo Red on Biochars Derived from Hickories, Mosses and Pine Needles |
| 投稿时间：2015-03-13 |
| DOI：10.11654/jaes.2015.08.021 |
| 中文关键词: 生物质炭 染料 等温吸附 吸附动力学 |
| 英文关键词: biochar dye adsorption isotherm adsorption kinetics |
| 基金项目:国家自然科学基金项目(21007026) |
|
| 摘要点击次数: 3242 |
| 全文下载次数: 95 |
| 中文摘要: |
| 在600 ℃和无氧条件下热裂解制备山核桃木、苔藓和松针三种生物质炭,用于研究三种生物质炭吸附阴离子型染料刚果红及阳离子型染料亚甲基蓝的pH效应、吸附等温线和吸附动力学效应。结果表明,碱性条件下三种生物质炭对亚甲基蓝表现出较好的吸附绩效,而酸性条件更利于三种生物质炭对刚果红的吸附。染料的初始浓度效应研究表明,生物质炭能有效吸附亚甲基蓝、刚果红,且吸附等温线能较好地符合Freundlich方程。三种生物质炭对刚果红吸附容量均比对亚甲基蓝吸附容量高。三种生物质炭对亚甲基蓝和刚果红的吸附主要发生在1 h内,然后缓慢增加,经6 h左右达到吸附平衡,吸附过程均符合伪二级动力学模型。颗粒内扩散模型拟合结果表明,颗粒内扩散阶段是限制吸附速率的主要阶段。 |
| 英文摘要: |
| Re-utilization of agricultural wastes not only reduces environmental pollution but also alleviates resources shortages, thus promoting the sustainable development of agriculture. Among waste-utilizing technologies, biomass pyrolysis to produce biochar at limited oxygen conditions is receiving increasing attentions. Biochar can reduce carbon emissions and is often used as adsorbents in wastewater treatments and soil remediation. In the present study, biochars produced from hickories, mosses and pine needles were used to examine the effects of solution pH, contacting time and initial concentrations of adsorbates on the sorption of congo red (CR) and methylene blue (MB) on three biochars. Strong alkaline medium was beneficial to the sorption of methylene blue, while acidic conditions favored the adsorption of congo red. The adsorption isotherms of methylene blue and congo red followed the Freundlich equation. The adsorption of both MB and CR increased with the initial concentrations of the dyes, and occurred mainly within 1 h. The dynamic adsorption process of the dyes fitted the pseudo second-order kinetic model and the intra-particle diffusion was the rate-controlling stage. These three biochars showed no significant difference in adsorption capacities for the dyes. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
