负载镍锌氧体木质素基活性炭吸附磺胺噻唑

Adsorption of sulfathiazole from aqueous solution by lignin-based activated carbon supported metallic oxide

以碱木素为原料热解制备碱木素基活性炭(LAC),在此基础上添加硝酸镍、硝酸锌等,用水热合成法成功制备出负载镍锌氧体的木质素基活性炭(NiZn-DO/LAC).通过SEM、BET、XRD等仪器对木质素基活性炭性能结构进行表征,并研究其在水溶液中对于磺胺噻唑(ST)的吸附.结果表明,所制得的木质素基活性炭具有明显的三维多孔结构与稳定的晶体结构,其具备较大的比表面积(759.1m^(2)/g).在吸附ST的过程中,NiZn-DO/LAC表现出较好的吸附性能,最大吸附容量可达328.2mg/g,优于其他报道的吸附剂.在NaOH溶液中,ST易从活性炭材料中脱附,在循环利用4次后,解吸率仍可达79.43%.NiZn-DO/LAC对ST的吸附主要通过静电作用、π-π堆积作用、络合作用、氢键作用及疏水性作用的协同,从而使吸附性能得到很大提高.

Alkali lignin was used as raw material to prepare alkali lignin-based activated carbon(LAC).And then,lignin-based activated carbon-supported with nickel-zinc oxides(NiZn-DO/LAC)was fabricated by hydrothermal synthesis after adding nickel nitrate and zinc nitrate onto LAC.The structure of NiZn-DO/LAC was characterized by BET,SEM and XRD,and the adsorption behavior of sulfathiazole(ST)in aqueous solution was also studied.The results showed that the NiZn-DO/LAC had evident obvious three-dimensional porous structure and stable crystal structure with a large specific surface area of 759.1 m^(2)/g.In the process of ST adsorption,the NiZn-Do/Lac showed excellent adsorption performance,with the maximum adsorption capacity up to 328.2 mg/g,which was better than other reported adsorbents.Additionally,the ST was easily desorbed from NiZn-DO/LAC with NaOH solution and the analytical rate of NiZn-DO/LAC was still reach up to 79.43% after 4 times of recycles.Furthermore,it showed that the adsorption behavior of ST over NiZn-DO/LAC was mainly through the synergistic effect of electrostatic interaction,π-πinteraction,complexation,hydrophobic effects and hydrophobicity,resulting in a great improvement of adsorption performance.