Abstract

The presence of norfloxacin antibiotic (NFX) in drinking water raises significant scientific concern due to the health and environmental problems that may cause. This study aimed to evaluate the NFX removal: 1) in batch adsorption at different pH values on montmorillonite (M) and montmorillonite-carbon hybrids (M-HC); 2) in continuous columns experiments, to assess the technological application of these hybrids as domestic filters, using one M-HC as adsorbent material ranging from 1% to 5%. Batch experiments showed that adsorption occurred in all the samples, being M the material with the highest adsorption capacity (95% of adsorption for cationic NFX). For the

M-HC the adsorption seemed to be not strongly dependent of the pH (20%- 41% of adsorption). The characterization of adsorbents and NFX adsorption products (FTIR, XRD, and zeta potential analysis) disclosed that adsorption occurs at both the external surface and the interlayer space of M. For the M-HC synthesized without activation, the interlayer space seemed to be predominantly responsible; while for the activated M-HC the adsorption occurred at the external surface (its interlayer was destroyed). The column experiments revealed that the best adsorption capacity and highest flow were attained using 1% of adsorbent material in the column packing.

摘要

由于可能引起的健康和环境问题，饮用水中存在诺氟沙星抗生素（NFX）引起了广泛的科学关注。这项研究旨在评估NFX的去除：1）在不同pH值下在蒙脱石（M）和蒙脱石-碳杂化物（M-HC）上分批吸附；2）在连续柱实验中，使用1％至5％的一种M-HC作为吸附剂材料，评估这些杂化物作为家用过滤器的技术应用。批处理实验表明，所有样品均发生吸附，其中M为具有最高吸附容量的物质（阳离子NFX的吸附率为95％）。为了

M-HC的吸附似乎与pH值（吸附的20％至41％）之间并不密切相关。吸附剂和NFX吸附产物的表征（FTIR，XRD和zeta电位分析）显示，吸附同时发生在M的外表面和层间空间。对于未经活化合成的M-HC，层间空间似乎占主导地位负责 而对于活化的M-HC，吸附发生在外表面（其夹层被破坏）。色谱柱实验表明，在色谱柱填料中使用1％的吸附剂材料可获得最佳的吸附容量和最高的流量。