Natural laterite(ML) has been used as raw materials for the preparation of modified laterite arsenic remo-ving adsorbent. The influences of reaction time,pH and competitive ions on the adsorption capacity of the adsorbent for arsenic are investigated,and the adsorption mechanisms analyzed. The results show that the adsorbent has pretty high adsorbing capacity for arsenic in wastewater. When the reaction is within 60 min ,the adsorption capacity of the adsorbent for arsenic increases drastically. The saturated adsorption capacity of the adsorbent for arsenic can reach 19.2 mg/g. Acidic and neutral pH environments are good for the adsorption and removal of arsenic. The existence of PO43-and arsenic in wastewater has strong competitive adsorption,while the competitive adsorption effect of SO42-and NO3-on arsenic is negligible.%以天然铁矾土为原料制备得到改性铁矾土除砷吸附剂，考察了反应时间、pH、竞争离子对该吸附剂吸附砷效能的影响，并对吸附机理进行了分析。结果表明：该吸附剂对废水中的砷具有较高的吸附效能。在反应时间为60 min内，该吸附剂对砷的吸附呈快速上升趋势；该吸附剂对砷的饱和吸附量可达19．2 mg/g；酸性与中性的pH环境有利于砷的吸附去除；废水中的PO43-与砷存在较强的竞争吸附，而SO42-、NO3-与砷的竞争吸附作用较小。
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