CTMAB-磁性蛭石对邻苯二酚吸附特性的研究
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摘要
以蛭石为原料制备了磁性蛭石复合材料,并用十六烷基三甲基溴化铵(CTMAB)改性,得到CTMAB-磁性蛭石,用XRD、SEM、FTIR、BET对改性前后的蛭石进行表征。结果表明,改性后蛭石吸附剂的比表面积、孔容增大。在25℃、邻苯二酚初始质量浓度为50 mg/L、pH为7条件下,CTMAB-磁性蛭石投加量为0.4 g时,吸附趋于平衡,邻苯二酚最大去除率为95.8%,与蛭石相比,CTMAB-磁性蛭石具有较好的吸附性能。
Vermiculite has been used as raw material for the preparation of magnetic vermiculite composite material,which should then be modified with hexadecyl trimethyl ammonium bromide(CTMAB),so as to obtain CTMAB-magnetic vermiculite. The modified vermiculite has been characterized by means of XRD,SEM,FTIR and BET. The results show that the specific surface area and pore volume of the modified vermiculite are increased. Under the following conditions:the dosage of CTMAB-magnetic vermiculite is 0.4 g,adsorption temperature 25 ℃,initial mass concentration of catechol 50 mg/L, and pH=7,the adsorption tends to balance,and the maximum removing rate of catechol is 95.8%. CTMAB-magnetic vermiculite has better adsorption capability,compared with vermiculite.
Vermiculite has been used as raw material for the preparation of magnetic vermiculite composite material,which should then be modified with hexadecyl trimethyl ammonium bromide(CTMAB),so as to obtain CTMAB-magnetic vermiculite. The modified vermiculite has been characterized by means of XRD,SEM,FTIR and BET. The results show that the specific surface area and pore volume of the modified vermiculite are increased. Under the following conditions:the dosage of CTMAB-magnetic vermiculite is 0.4 g,adsorption temperature 25 ℃,initial mass concentration of catechol 50 mg/L, and pH=7,the adsorption tends to balance,and the maximum removing rate of catechol is 95.8%. CTMAB-magnetic vermiculite has better adsorption capability,compared with vermiculite.
引文
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[4]O’Connell D W,Birkinshaw C,O’Dwyer T F.Heavy metal adsorbents prepared from the modification of cellulose:a review[J].Bioresource Technology,2008,99(15):6709-6724.
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[6]朱利中,王晴.阴-阳离子有机膨润土吸附水中苯胺、苯酚的性能[J].环境科学,2000,21(4):42-46.
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[10]于旭彪,韦朝海,吴超飞,等.有机黏土疏水性吸附过程的分子模拟:烷基碳原子数和有机物logKow的影响[J].环境科学学报,2012,32(9):2049-2057.
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