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首页> 外文期刊>ACS applied materials & interfaces >Noncompetitive and Competitive Adsorption of Heavy Metals in Sulfur-Functionalized Ordered Mesoporous Carbon
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Noncompetitive and Competitive Adsorption of Heavy Metals in Sulfur-Functionalized Ordered Mesoporous Carbon

机译：硫官能化有序介孔碳中重金属的非竞争性和竞争性吸附

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In this work, sulfur-functionalized ordered mesoporous carbons were synthesized by activating the soft-templated mesoporous carbons with sulfur bearing salts that simultaneously enhanced the surface area and introduced sulfur functionalities onto the parent carbon surface. XPS analysis showed that sulfur content within the mesoporous carbons were between 8.2% and 12.9%. The sulfur functionalities include C-S, C=S, -COS, and SOx. SEM images confirmed the ordered mesoporosity within the material. The BET surface areas of the sulfur-functionalized ordered mesoporous carbons range from 837 to 2865 m(2)/g with total pore volume of 0.71-2.3 cm(3)/g. The carbon with highest sulfur functionality was examined for aqueous phase adsorption of mercury (as HgCl2), lead (as Pb(NO3)(2)), cadmium (as CdCl2), and nickel (as NiCl2) ions in both noncompetitive and competitive mode. Under noncompetitive mode and at a pH greater than 7.0 the affinity of sulfur-functionalized carbons toward heavy metals were in the order of Hg > Pb > Cd > Ni. At lower pH, the adsorbent switched its affinity between Pb and Cd. In the noncompetitive mode, Hg and Pb adsorption showed a strong pH dependency whereas Cd and Ni adsorption did not demonstrate a significant influence of pH. The distribution coefficient for noncompetitive adsorption was in the range of 2448-4000 mL/g for Hg, 290-1990 mL/g for Pb, 550-560 mL/g for Cd, and 115-147 for Ni. The kinetics of adsorption suggested a pseudo-second-order model fits better than other models for all the metals. XPS analysis of metal-adsorption carbons suggested that 7-8% of the adsorbed Hg was converted to HgSO4, 14% and 2% of Pb was converted to PbSO4 and PbS/PbO, respectively, and 5% Cd was converted to CdSO4. Ni was below the detection limit for XPS. Overall results suggested these carbon materials might be useful for the separation of heavy metals.
机译：在这项工作中，通过用含硫盐活化软模板化的介孔碳来合成硫官能化的有序介孔碳，硫盐同时增加了表面积并将硫官能团引入母体碳表面。 XPS分析表明，介孔碳中的硫含量在8.2％至12.9％之间。硫官能团包括C-S，C = S，-COS和SOx。 SEM图像证实了材料内有序的介孔性。硫官能化有序介孔碳的BET表面积为837至2865 m（2）/ g，总孔体积为0.71-2.3 cm（3）/ g。在非竞争性和竞争性模式下，检查了具有最高硫官能度的碳在水相中的吸附汞（以HgCl2的形式），铅（以Pb（NO3）（2）的形式），镉（以CdCl2的形式）和镍（以NiCl2的形式）吸附。 。在非竞争模式下，在pH值大于7.0时，硫官能化碳对重金属的亲和力为Hg> Pb> Cd> Ni。在较低的pH值下，吸附剂会在Pb和Cd之间切换其亲和力。在非竞争模式下，Hg和Pb吸附表现出很强的pH依赖性，而Cd和Ni吸附没有表现出对pH的显着影响。非竞争性吸附的分布系数对于Hg为2448-4000 mL / g，对于Pb为290-1990 mL / g，对于Cd为550-560 mL / g，对于Ni为115-147。吸附动力学表明，对于所有金属，拟二级模型比其他模型更适合。对金属吸附碳的XPS分析表明，吸附的Hg的7-8％转化为HgSO4，Pb的14％和2％分别转化为PbSO4和PbS / PbO，5％的Cd转化为CdSO4。 Ni低于XPS的检测极限。总体结果表明，这些碳材料可能对重金属的分离有用。

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