期刊
APPLIED WATER SCIENCE
卷 7, 期 7, 页码 4067-4076出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s13201-017-0563-z
关键词
Biosorption; Diazinon; Pesticide; Pre-treated coffee waste
资金
- Faculty of mechanical and Engineering Processes (USTHB, Algiers)
This study explores the feasibility of pre-treated coffee waste (PCW) as biosorbent for the removal of diazinon. The effect of the pesticide concentration (6-20 mg L-1), contact time, adsorbent dose (0.2-1.2 g L-1), solution pH (3-11.5), temperature (15-40 degrees C) and co-existing inorganic ions (H2PO4 (-), NO3 (-)) on the diazinon biosorption over PCW is investigated. The experimental results indicate an optimal pH of 7.3 for the diazinon elimination on PCW (1 g L-1). The Langmuir model describes well the isotherm data with a high regression coefficient (R (2) > 0.990) and a maximum monolayer biosorption capacity of 18.52 mg g(-1) at 15 degrees C. It is also observed that the intra-particle diffusion is not the rate-controlling step. A comparison is evaluated between the pseudo-second-order and intra-particle diffusion kinetic models; the experimental data are well fitted by the pseudo-second-order kinetic model. The biosorption capacity decreases with increasing temperature for a diazinon concentration of 10 mg L-1. The negative enthalpy Delta H degrees (-63.57 kJ/mol) indicates that the diazinon biosorption onto PCW is exothermic. Under optimal conditions, the biosorption reaches 95% after 90 min. The removal efficiency decreases from 95 to 65.67 and 48.9% for the diazinon alone and in the presence of NO3- and H2PO4- (100 mg L-1), respectively.
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