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| Quinclorac Adsorption on HDTMAB-modified Montmorillonite |
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| KeyWord:quinclorac; HDTMAB; modification; adsorption |
| Author Name | Affiliation | | DING Chun-xia | College of Science, Hunan Agricultural University, Changsha 410128, China
Institute of Tobacco Research, Hunan Agricultural University, Changsha 410128, China | | HE Zi-jun | College of Science, Hunan Agricultural University, Changsha 410128, China | | ZHENG Chen | College of Resource and Environment, Hunan Agricultural University, Changsha 410128, China | | CAI Li-min | College of Resource and Environment, Hunan Agricultural University, Changsha 410128, China | | GONG Dao-xin | Institute of Tobacco Research, Hunan Agricultural University, Changsha 410128, China
College of Resource and Environment, Hunan Agricultural University, Changsha 410128, China |
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| Abstract: |
| Natural montmorillonite, characteristized with high hydrophilicity, shows little adsorption of non-polar organic substances. This study examined the adsorption of quinclorac on the montmorillonite modified by hexadecyltrimethyl ammonium bromide（HDTMAB） as influenced by contact time, adsorbate concentration, temperature, pH and adsorbent doses. The modified adsorbent was also characterized by X-ray diffraction（XRD） and Fourier transform infrared spectroscopy（FT-IR）. HDTMAB was adsorbed in the interlayer of montmorillonite, which expanded the layer spacing of the modified montmorillonite. The modified montmorillonite exhibited higher quinclorac removal efficiency than the unmodified montmorillonite did. The experimental data was fitted very well with the pseudo-second-order kinetic model, indicating that chemisorption was the controlling step of the adsorption. The adsorption isotherm of quinclorac was in good agreement with Linear and Freundlich isotherm models. The adsorption capacity decreased from 1.86 mg·g-1 to 1.65 mg·g-1 with temperature increase from 25 ℃ to 45 ℃ at an initial concentration of 10.00 mg·L-1, suggesting that the adsorption was exothermic. Adsorption capacity of quinclorac on modified montmorillonite decreased with increased pH. |
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