十四烷基三甲基溴化铵改性活性炭吸附水中硝酸盐和磷酸盐

doi:10.16085/j.issn.1000-6613.2016-2215

化工进展 ›› 2017, Vol. 36 ›› Issue (07): 2676-2683.DOI: 10.16085/j.issn.1000-6613.2016-2215

十四烷基三甲基溴化铵改性活性炭吸附水中硝酸盐和磷酸盐

朱加乐, 王欣泽, 沈剑, 林燕

上海交通大学环境科学与工程学院, 上海 200240

收稿日期:2016-11-30 修回日期:2017-03-08 出版日期:2017-07-05 发布日期:2017-07-05
通讯作者: 林燕,副教授,研究方向为水体富营养化防治。
作者简介:朱加乐(1993-),男,硕士研究生,研究方向为污水处理与回用。E-mail:zjlheros@163.com。
基金资助:
国家水体污染控制与治理科技重大专项项目（2012ZX07105-003）。

Adsorption of nitrate and phosphate by MTAB-modified activated carbon

ZHU Jiale, WANG Xinze, SHEN Jian, LIN Yan

Department of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China

Received:2016-11-30 Revised:2017-03-08 Online:2017-07-05 Published:2017-07-05

摘要/Abstract

摘要： 采用阳离子表面活性剂十四烷基三甲基溴化铵（MTAB）作为改性剂对活性炭进行改性，考察所制备的MTAB改性活性炭对硝酸盐和磷酸盐的吸附效果。研究结果表明，6mmol/L的MTAB对活性炭的改性效果最好（记为MAC-6），对硝酸盐和磷酸盐的最大平衡吸附量分别为24.51mg/g和5.67mg/g，远高于未改性的活性炭14.45mg/g和3.59mg/g。MAC-6的等温吸附曲线实验和吸附动力学实验研究发现，Langmuir吸附模型和准二级动力学吸附模型能够很好地描述MAC-6对于硝酸盐和磷酸盐的吸附。此外，pH过高会抑制MAC-6对于硝酸盐和磷酸盐吸附。水中共存的磷酸盐和硝酸盐会相互抑制，但硝酸盐对磷酸盐的抑制作用更强，更易于被MAC-6吸附。MAC-6对硝酸盐和磷酸盐的主要吸附机制有静电吸附和离子交换吸附，其中离子交换吸附占主导作用。此外，MAC-6经4次再生脱附后仍具有很好的吸附效果，这表明其对硝酸盐和磷酸盐的吸附具有稳定性。

关键词: 十四烷基三甲基溴化铵, 改性活性炭, 硝酸盐, 磷酸盐, 吸附

Abstract: The cationic surfactant modified activated carbon was prepared by loading myristyltrimethylammonium bromide (MTAB) on activated carbon.Then,it was used as an absorbent for nitrate and phosphate removal.The results revealed that the biggest adsorption capacity of modified activated carbon for nitrate and phosphate was 24.51mg/g and 5.67mg/g,respectively,when the concentration of MTAB is 6mmol/L,which was much higher than that of activated carbon (14.45mg/g and 3.59mg/g).To analyze adsorption of nitrate and phosphate by MAC-6,adsorption kinetic and isotherm were used and fitted well with pseudo-second order kinetic model and Langmuir adsorption model,respectively.High pH was unfavorable for nitrate and phosphate adsorption onto MAC-6.Coexisting nitrate and phosphate in solution reduced capacity for each other,but coexisting nitrate is more readily adsorbed by MAC-6.The adsorption mechanism of nitrate and phosphate on MAC-6 included electrostatic attraction and anion exchange interactions but the latter played a leading role.In addition,it was found that MAC-6 still had good adsorption for both nitrate and phosphate after four cyclic adsorption-desorption experiments,which indicated that MAC-6 had good adsorption stability.

Key words: myristyltrimethylammonium bromide (MTAB), modified activated carbon, nitrate, phosphate, adsorption

中图分类号:

X703

朱加乐, 王欣泽, 沈剑, 林燕. 十四烷基三甲基溴化铵改性活性炭吸附水中硝酸盐和磷酸盐[J]. 化工进展, 2017, 36(07): 2676-2683.

ZHU Jiale, WANG Xinze, SHEN Jian, LIN Yan. Adsorption of nitrate and phosphate by MTAB-modified activated carbon[J]. Chemical Industry and Engineering Progress, 2017, 36(07): 2676-2683.

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十四烷基三甲基溴化铵改性活性炭吸附水中硝酸盐和磷酸盐

Adsorption of nitrate and phosphate by MTAB-modified activated carbon

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