Adsorption of polycyclic aromatic hydrocarbons by surfactant-modified clinoptilolites for landfill leachate treatment

被引:13
作者
Hedayati, Monireh S. [1 ]
Abida, Otman [2 ]
Li, Loretta Y. [1 ]
机构
[1] Univ British Columbia, Dept Civil Engn, 6250 Appl Sci Lane, Vancouver, BC V6T 1Z4, Canada
[2] Al Akhawayn Univ Ifrane, Sch Sci & Engn, Hassan II Ave, Ifrane 53000, Morocco
基金
加拿大自然科学与工程研究理事会;
关键词
Modified clinoptilolite; Cationic surfactant; PAH leachability; Adsorption capacity; Landfill leachate; HYDROPHOBIC ORGANIC-COMPOUNDS; ACTIVATED CARBON; HEAVY-METALS; WASTE-WATER; BISPHENOL-A; REMOVAL; SORPTION; PAHS; SOILS; DEGRADATION;
D O I
10.1016/j.wasman.2021.06.033
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The authors report the potential adsorption capacities of three surfactant-modified clinoptilolites (MC)-cetylpyridinium chloride (CPC)-MC, didodecyldimethylammonium bromide (DDAB)-MC, and hexadecyltrimethylammonium bromide (HDTMA)-MC-for the removal of polycyclic aromatic hydrocarbons (PAHs) from aquatic environments and landfill leachate. A liquid-liquid extraction method was used to extract PAHs from water and GC/MS was used to analyse the PAHs. PAH accumulations on CPC-MC, DDAB-MC, and HDTMA-MC were linear over 21 successive batch adsorption tests for anthracene (708, 737, and 750 mu g/g), fluoranthene (1355, 1583, and 1303 mu g/g), fluorene (973, 1060, and 1147 mu g/g), phenanthrene (844, 1057, and 989 mu g/g), and pyrene (1343, 1569, and 1269 mu g/g). The leachability after 21 successive accumulations was <2% for anthracene, <4% for fluoranthene, <3% for fluorene, <4% for pyrene, and <5% for phenanthrene for each adsorbent. PAH removals from landfill leachate for anthracene, fluoranthene, fluorene, phenanthrene, and pyrene were 97.8%, 98.6%, 95.7%, 97.0%, and 98.5% for CPC-MC and 99.0%, 99.6%, 98.0%, 99.0%, and 99.6% for DDAB-MC, respectively, meeting the fresh water quality standards established by British Columbia and the World Health Organization (WHO) for anthracene, fluoranthene, and fluorene. The molecular weight and molecular structure of PAHs and the hydrophobicity of adsorbents can fundamentally influence the PAH adsorption mechanism based on 7C-7C stacking.
引用
收藏
页码:503 / 512
页数:10
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