Adsorption of arsenic(III) and arsenic(V) from groundwater using natural siderite as the adsorbent
Adsorption of arsenic(III) and arsenic(V) from groundwater using natural siderite as the adsorbent
复制标题
以天然菱铁矿为吸附剂吸附地下水中砷(III)和砷(V)
DOI：
10.1016/j.jcis.2007.06.035
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发表时间：
2007-11-01
影响因子：
9.9
通讯作者：
Berner, Zsolt
中科院分区：
文献类型：
--
作者：
Guo, Huaming;Stueben, Doris;Berner, Zsolt
利用天然菱铁矿进行了批次和柱试验，以去除水中的As（V）和As（III）。将100毫克菱铁矿在室温下与50毫升1000 μ g/L的As（V）或As（III）在0.01 M NaCl中反应8天。砷浓度随时间呈指数下降，并在3天内达到假平衡。估计的吸附容量分别为520和1040微克/克的As（V）和As（III），分别。柱研究表明，在26，000孔体积的500 μ g/L As水的通过量之后，流出物As低于1.0 μ g/L，对应于过滤器中约2000 μ g/g的As负载。扫描电子显微镜（SEM）和透射电子显微镜（TEM）的结果表明，高的作为过滤器的保留容量所产生的铁氧化物与As的共沉淀，并随后吸附在新鲜的铁氧化物/氢氧化物的As。砷加标自来水中的过滤器中的砷吸附相对低于人工As溶液，因为高HCO 3-浓度抑制菱铁矿溶解，从而抑制了菱铁矿颗粒上新鲜铁氧化物的产生。TCLP（毒性特征浸出程序）的结果表明，这些废吸附剂是惰性的，可以填埋。(c)2007年爱思唯尔公司All rights reserved.
Batch and column tests were performed utilizing natural siderite to remove As(V) and As(III) from water. One hundred milligrams of siderite was reacted at room temperature for up to 8 days with 50 rnL of 1000 mu g/L As(V) or As(III) in 0.01 M NaCl. Arsenic concentration decreased exponentially with time, and pseudoequilibrium was attained in 3 days. The estimated adsorption capacities were 520 and 1040 mu g/g for As(V) and As(III), respectively. Column studies show that effluent As was below 1.0 mu g/L after a throughput of 26,000 pore volumes of 500 mu g/L As water, corresponding to about 2000 mu g/g of As load in the filter. Results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) reveal that high As retention capacity of the filter arose from coprecipitation of Fe oxides with As and subsequently adsorption of As on the fresh Fe oxides/hydroxides. Arsenic adsorption in the filter from As-spiked tap water was relatively lower than that from artificial As Solution because high HCO3- concentration restrained siderite dissolution and thus suppressed production of the fresh Fe oxides on the siderite grains. The TCLP (toxicity characteristic leaching procedure) results suggest that these spent adsorbents were inert and could be landfilled. (c) 2007 Elsevier Inc. All rights reserved.