| 13X沸石分子筛对水中Hg2+吸附性能的实验研究 |
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| 引用本文： | 白峰,马鸿文,王英滨.13X沸石分子筛对水中Hg2+吸附性能的实验研究[J].地学前缘,2005,12(1):165-170. |
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| 作者姓名： | 白峰 马鸿文 王英滨 |
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| 作者单位： | 中国地质大学,矿物材料国家专业实验室,北京,100083;中国地质大学,矿物材料国家专业实验室,北京,100083;中国地质大学,矿物材料国家专业实验室,北京,100083 |
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| 基金项目： | 高等学校博士学科点专项科研项目 |
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| 摘 要： | 13X沸石分子筛吸附水中Hg2+的实验研究表明,13X沸石在pH值为5~6、时间为20 min、温度为20~30 ℃条件下对Hg2+ 的吸附效果最佳。在13X沸石的用量为4 g/L的条件下对原始浓度为0.2 ~100mg/L的Hg2+进行吸附,吸附量由0.035 6 mg/g增加到21.87 mg/g。13X沸石可使原始浓度为0.01 mg/L的Hg2+降至0.002 mg/L以下。饱和NaCl溶液对吸附Hg2+后的13X沸石解吸效果良好,解吸后的13X沸石循环使用4次,对Hg2+的吸附率仍未降低,表明13X沸石的重复利用效果良好。通过在洗脱Hg2+ 的解吸液中加入Na2S·9H2O,可使Hg2+形成HgS沉淀进行回收,回收率可达90%以上。实验表明,13X沸石适用于对水中低浓度Hg2+的深度净化处理。
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| 关 键 词： | 13X沸石 分子筛 Hg2+ 吸附 |
| 文章编号： | 1005-2321(2005)01-0165-06 |
| 修稿时间： | 2004年11月22 |
Adsorption capability of 13X zeolite molecular sieve to Hg2+ in water: An experimental study |
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| BAI Feng,MA Hong-wen,WANG Ying-bin.Adsorption capability of 13X zeolite molecular sieve to Hg2+ in water: An experimental study[J].Earth Science Frontiers,2005,12(1):165-170. |
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| Authors: | BAI Feng MA Hong-wen WANG Ying-bin |
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| Abstract: | The primary influential factors,the capacities of adsorption and desorption, and the mechanism for the removal of Hg~(2+) in water by using 13X zeolite were experimentally investigated. The results showed that the optimum conditions for the removal of Hg~(2+) are:the 5~6 pH value of the solutions,the adsorption time of 20 min and the adsorption temperature of 20~30 ℃. The adsorption capacity could reach 21.87 mg of Hg~(2+) per gram of 13X zeolite in 100 mg/L Hg~(2+) concentration. Adsorption proportions of Hg~(2+) were higher in high concentration than those in low concentration were. 13X zeolite could decrease Hg~(2+) concentration from 0.01 mg/L to 0.004 mg/L. The 13X zeolite saturated with Hg~(2+) could be regenerated in saturated NaCl solutions without noticeable loss of capacity. The result of removal of Hg~(2+) was even more efficient. Exchanged Hg~(2+) from 13X zeolite could be recovered by Na_2S·9H_2O solutions. Recovery rate of Hg~(2+) could reach 90 percent. The experimental results show that the 13X zeolite is suitable for the removal of low concentration Hg~(2+) in water. |
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| Keywords: | Hg2 |
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