| 碱铜联合改性珠状活性炭及其对甲苯的吸附机理 |
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| 引用本文： | 韩智广,刘寒冰,陈传胜,袁雪红,薛南冬.碱铜联合改性珠状活性炭及其对甲苯的吸附机理[J].环境科学研究,2021,34(11):2665-2673. |
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| 作者姓名： | 韩智广 刘寒冰 陈传胜 袁雪红 薛南冬 |
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| 作者单位： | 1.中南林业科技大学环境科学与工程学院, 湖南 长沙 410004 |
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| 基金项目： | 国家重点研发计划重点专项2016YFD0800202国家重点研发计划重点专项2017YFD0800700 |
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| 摘 要： | 为了提高活性炭吸附材料对非极性污染物的吸附性能，采用碱（NaOH溶液）联合铜（Cu（CH3COO）2溶液]对珠状活性炭（beaded active carbon，BAC）进行改性，利用BET、SEM、Boehm滴定和FT-IR对改性前后的活性炭进行表征，并采用动态吸附法和Yoon-Nelson吸附理论模型研究了不同改性方法对活性炭吸附甲苯穿透曲线、饱和吸附量的影响及吸附机理.结果表明:改性后BAC表面不规则的孔隙增多，比表面积和微孔容积减少，平均孔径变化不显著，表面Cu含量明显升高；不同浓度碱铜联合改性后BAC对甲苯的吸附性能均提高，当NaOH溶液浓度为8 mol/L、Cu（CH3COO）2溶液质量分数为0.5%时，联合改性效果最好，此时改性后BAC对甲苯的饱和吸附量较改性前增加了50.9%，吸附穿透时间延长了342.9%，吸附平衡时间延长了77.4%.研究显示:较高浓度的碱联合较低浓度的铜溶液对活性炭改性，能显著提高吸附甲苯性能；改性后BAC对甲苯的吸附性能受自身孔隙结构和表面官能团的共同影响，且表面酸性官能团影响显著，表面金属铜与甲苯的结合作用是主要的吸附过程.
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| 关 键 词： | 活性炭 碱铜联合改性 酸性官能团 甲苯 |
| 收稿时间： | 2021-04-14 |
Beaded Active Carbon Modified by Alkali and Copper and Its Toluene Adsorption Mechanism |
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| Affiliation: | 1.College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China2.Technical Center for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China |
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| Abstract: | Alkali (NaOH)-copper (Cu(CH3COO)2) modified beaded active carbons (BACs) were developed to improve the adsorption capacity of BACs for non-polar pollutants. BET, SEM, Boehm titration and FT-IR analyses determined that the alkali-copper BACs had abundant irregular pore structure, small surface area and micropore volume, and high Cu loading on its surface. The surface characteristics enhanced the adsorption of toluene, which reached a peak under the conditions of the 8 mol/L NaOH solution and 0.5% of Cu(CH3COO)2 solution, indicating that the modification of BACs with high concentration NaOH solution and low concentration Cu(CH3COO)2 solution facilitated the highest adsorption of toluene. Compared with the activated carbon, the adsorption capacity of the BACs for toluene increased by 50.9%, the adsorption breakthrough time increased by 342.9%, and the adsorption equilibrium time increased by 77.4%. The proportion of carboxyl groups and phenolic hydroxyl groups on BAC surface decreased with the increase of NaOH concentration, while the number of carboxyl groups and acidic functional groups on the BACs surface increased with the increase of Cu(CH3COO)2 concentration. It was concluded that the adsorption capacity of the alkali-copper BACs for toluene maybe affected by pore structure and surface functional groups, especially the surface acidic functional groups, the main adsorption process is the combination of copper and toluene. |
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