Removal of cadmium(II) from aqueous solutions by steam-activated sulphurised carbon prepared from sugar-cane bagasse pith : kinetics and equilibrium studies
Removal of cadmium(II) from aqueous solutions by steam-activated sulphurised carbon prepared from sugar-cane bagasse pith : kinetics and equilibrium studies
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DOI：
10.4314/wsa.v29i2.4849
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发表时间：
2003-04
期刊：
影响因子：
1.5
通讯作者：
K. A. Krishnan;T. Anirudhan
中科院分区：
文献类型：
--
作者：
K. A. Krishnan;T. Anirudhan
研究了以甘蔗渣为原料制备的水蒸气硫化活性炭（SA-S-C）对水溶液中镉（II）的去除效果。批量吸附实验作为溶质浓度，接触时间，吸附剂剂量，pH值，温度和离子强度的函数进行。最大去除发生在pH值为5.0至9.0的范围内。当初始Cd（II）浓度为50 mg/dm 3，pH值为6.0时，硫含量为8.9%的SA S C对Cd（II）的最大吸附率为98.8%（24.70 mg/g）.吸附过程遵循准二级动力学。动力学参数作为初始浓度和温度的函数进行了测定，以预测镉（II）到SA-S-C的吸附行为。降低溶液的离子强度可以提高吸附剂的吸附能力。在整个浓度范围内（50 ~ 1000 mg/dm 3），平衡数据可用Langmuir吸附等温方程拟合。的SA-S-C的Cd（II）去除的有效性进行了检查，并与文献中报道的其他吸附剂进行了比较。在pH为6.0的溶液中，30°C时的Langmuir吸附等温线计算出SA-S-C的最大吸附量为149.93 mg/g。为了回收吸附的金属离子并将吸附剂恢复到其原始状态，尝试了几个循环的酸再生。
Removal of cadmium(II) from aqueous solutions was studied using steam activated sulphurised carbon (SA-S-C) prepared from bagasse pith (a sugar-cane industry waste). Batch adsorption experiments were performed as a function of solute concentration, contact time, adsorbent dose, pH, temperature and ionic strength. The maximum removal took place in the pH range of 5.0 to 9.0. The maximum adsorption of 98.8 % (24.70 mg/g) took place by SA-S-C with 8.9 % sulphur content at pH 6.0 from an initial Cd(II) concentration of 50 mg/dm 3 . The sorption process follows pseudo-second-order kinetics. Kinetic parameters as a function of initial concentration and temperature were determined to predict the adsorption behaviour of Cd(II) onto SA-S-C. Decrease in ionic strength of the solution was found to improve the adsorption capacity of the adsorbent. The equilibrium data could be best fitted by the Langmuir adsorption isotherm equation over the entire concentration range (50 to 1 000 mg/dm 3 ). The effectiveness of the SA-S-C for Cd(II) removal was examined and compared with other adsorbents reported in the literature. At solution pH of 6.0, the maximum adsorption capacity of SA-S-C calculated by the Langmuir isotherm is 149.93 mg/g at 30°C. Acid regeneration was tried for several cycles with a view to recover the sorbed metal ions and also to restore the sorbent to its original state.