摘要
以阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)对油茶果壳进行改性,制备CTAB-油茶果壳(CTABCOS)吸附材料,并采用批实验法对其对水溶液中甲基橙的吸附去除进行了研究。考察了溶液p H、吸附剂用量和离子强度等对水溶液中甲基橙的吸附影响,并研究了体系的吸附动力学和吸附热力学特征。结果表明,向100 m L浓度为50 mg/L的甲基橙溶液中加入0.40 g CTAB-COS,在最佳实验条件下,CTAB-COS对甲基橙的去除率可达96.66%。溶液离子强度增大,甲基橙去除率降低。CTAB-COS对甲基橙的吸附行为符合拟二级动力学模型,吸附等温线可用Langmuir模型进行较好拟合,在20℃时最大吸附量为18.31 mg/g。吸附热力学结果表明,吸附过程为可自发进行的放热过程。再生性实验结果表明,再生6次后,CTAB-COS对甲基橙的吸附去除率仍可达到80%。该改性油茶果壳可应用于阴离子型染料废水的吸附法处理。
Hexadecyl trimethyl ammonium bromide-modified Camellia oleifera（ tea） shell（ CTAB-COS）was prepared and used as a biosorbent for the adsorption of methyl orange in aqueous solution. The effects of various experimental parameters,such as p H value,sorbent dosage,and ionic strength were studied in relation to methyl orange removal,and the optimal conditions were determined. The results showed that electrostatic and hydrophobic interactions may be the primary factors affecting adsorption. Under optimal conditions,96. 66% of the methyl orange was removed by adding 0. 40 g of CTAB-COS powder into 100 m L of methyl orange solution with a concentration of 50 mg / L. The removal rate of methyl orange decreased with increasing ionic strength. The bioadsorption kinetics and the adsorption isotherm data,fitted well with the pseudo-second kinetics model and the Langmuir model equation,respectively. The maximum amount of methyl orange adsorbable by CTAB-COS was18. 31 mg / g. The thermodynamics results showed that the biosorption was an exothermic process and could proceed spontaneously. The biosorbent material had a very good regeneration property and the adsorption removal rate could reach 80%,even after the biosorbent was regenerated six times. The CTAB-COS adsorbent could be used to treat water contaminated with anionic dyes.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第2期669-675,共7页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(21165013
21366024)
江西省青年科学基金项目(20114BAB213016)
江西省重大科技招标项目(赣科发计字[2014]56-6号)
关键词
油茶果壳
十六烷基三甲基溴化铵
甲基橙
生物吸附
Camellia oleifera shell（COS）
cetyl trimethyl ammonium bromide（CTAB）
methyl orange
bioadsorption
