Batch-wise nitrate removal from water on a surfactant-modified zeolite

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• 作者：Joachim Schick ; Philippe Caullet ; Jean-Louis Paillaud ; Joë ; l Patarin ; Claire Mangold-Callarec
• 关键词：Nitrate removal ; Batch ; Water ; Surfactant-modified clinoptilolite ; HDTMA
• 刊名：Microporous and Mesoporous Materials
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：132
• 期：3
• 页码：395-400
• 全文大小：278 K

文摘

Nitrate adsorption kinetics were determined in batch-wise experiments on a surfactant-modified zeolite (SMZ), prepared by treatment of a clinoptilolite sample by HDTMABr (HDTMA⁺ being the hexadecyltrimethylammonium cation). The influence of various parameters was studied, namely initial nitrate concentration (0.08–8.06 mmol/L), liquid/solid weight ratio (L/S = 5–50 mL/g) and presence of Cl⁻, and competing anions (at the same equimolar concentration equal to 1.61 mmol/L). The equilibrium time for nitrate uptake is short (0.5–1 h), with a maximal removal value R_max. at equilibrium (R_max( % ) = 100 × (C_i − C_e)/C_i, where C_i and C_e are the initial and equilibrium concentrations in solution) of about 80 % for initial nitrate concentrations ([]_i) in the 0.08–2.42 mmol/L range. For higher concentrations (4.83 and 8.06 mmol/L), R_max. decreases significantly to 58 % and 40 % values, respectively. The sorption equilibrium data are in good agreement with the Langmuir isotherm model. On the other hand, the R_max. value decreases with the increase of adsorbent mass. Under the used experimental conditions, the presence of competing anions does not change the nitrate R_max.value, but slows down the exchange kinetics, the increasing affinity order towards the SMZ being the following: Cl⁻  .