Adsorption of nitrate and phosphate by MTAB-modified activated carbon

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

Abstract

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

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

CLC Number:

X703

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.

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.

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