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首页> 外文期刊>Journal of Hazardous Materials >Adsorption of cadmium by sulphur dioxide treated activated carbon
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Adsorption of cadmium by sulphur dioxide treated activated carbon

机译：二氧化硫处理的活性炭对镉的吸附。

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Merck carbon (1.5 mm) was treated in three ways: heating from ambient temperature to 900℃ in SO_2; treatment at ambient temperature in SO_2; or successive treatments in SO_2 and H_2S at ambient temperature. All samples were then characterised and tested as adsorbents of Cd~(2+) from aqueous solution. The characterisation was in terms of composition by effecting ultimate and proximate analyses and also of textural properties by N_2 adsorption at -196℃. Kinetics and extent of the adsorption process of Cd~(2+) were studied at 25 and 45℃ at pH of the Cd~(2+) solution (i.e., 6.2) and at 25℃ also at pH 2.0. The various treatments of the starting carbon had no significant effect on the kinetics of the adsorption of Cd~(2+), but increased its adsorption capacity. The most effective treatment was heating to 900℃, the adsorption in this case being 70.3% more than that of the starting carbon. The adsorption increased at 45℃ but decreased at pH 2.0 when compared to adsorption at 25℃ and pH 6.2, respectively.
机译：用三种方法处理了默克（1.5毫米）碳：在SO_2中从环境温度加热到900℃；在室温下加热到900℃。在SO_2中于环境温度下处理；或在环境温度下在SO_2和H_2S中连续处理。然后表征所有样品并作为水溶液中Cd〜（2+）的吸附剂进行测试。表征是通过进行最终和邻近分析进行的成分分析，以及在-196℃下通过N_2吸附进行的结构性质表征。研究了Cd〜（2+）溶液的pH（即6.2）在25和45℃以及pH值为2.0时在25和45℃对Cd〜（2+）的吸附动力学和程度。起始碳的各种处理对Cd〜（2+）的吸附动力学没有明显影响，但增加了其吸附能力。最有效的处理方法是加热到900℃，在这种情况下的吸附量比起始碳的吸附量高70.3％。与在25℃和pH 6.2下吸附相比，在45℃下吸附增加，但在pH 2.0下降低。

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