Department of Environmental Engineering, Kwandong University, Gangneung, Gangwon-do 210-701, Korea.
Environ Technol. 2010 Apr 1;31(4):445-53. doi: 10.1080/09593330903514474.
The objective of the present investigation was to explore the sorption behaviour of manganese-coated samples of calcined starfish (MCCSF) (i.e. the impregnation of calcined starfish with manganese) for the removal of low levels of an important heavy metal toxic ion, Mn(II), from aqueous solutions. The suitability of this solid was further compared with two different samples of manganese-coated sands (MCS): MCS4 and MCS9 impregnated at pH 4.0 and pH 9.0, respectively. These comparative studies were performed in both batch and column experiments. Batch data indicated that a fairly good stability of the coating was obtained for these three samples in the pH region 2.5 to 10.0. The removal efficiency of MCCSF was fairly good in comparison with the MCS4 and MCS9 samples. These last two samples possessed similar Mn(II) removal capacities. Moreover, a small dose of sodium hypochlorite further enhanced the uptake of Mn(II) by these solids. The sorbate concentration dependence data fitted reasonably well to the Freundlich adsorption isotherm. The column data indicated that MCCSF possessed a relatively higher adsorption capacity compared with the MCS4 and MCS9 samples. The breakthrough curves obtained were then used to evaluate the apparent removal capacity of these solids under the dynamic conditions using the Thomas equation. The SEM images obtained for these manganese-coated solids along with the virgin base materials, i.e. sand and calcined starfish, showed that manganese oxides occupied the surfaces or pores of the base materials and formed clusters on the base surface.
本研究的目的是探讨煅烧海星锰涂层样品（MCCSF）（即煅烧海星浸渍锰）对水溶液中低水平重要重金属毒性离子 Mn(II)的吸附行为。将这种固体的适用性与两种不同的锰涂层砂（MCS）：MCS4 和 MCS9 进行了比较，这两种样品分别在 pH4.0 和 pH9.0 下浸渍。这些对比研究在批量和柱实验中进行。批量数据表明，在 pH2.5 至 10.0 范围内，这三种样品的涂层稳定性相当好。与 MCS4 和 MCS9 样品相比，MCCSF 的去除效率相当好。后两种样品具有相似的 Mn(II)去除能力。此外，少量次氯酸钠进一步提高了这些固体对 Mn(II)的吸收。吸附质浓度依赖数据与 Freundlich 吸附等温线拟合较好。柱数据表明，与 MCS4 和 MCS9 样品相比，MCCSF 具有相对较高的吸附能力。然后使用 Thomas 方程从动态条件下评估这些固体的表观去除容量。对这些锰涂层固体以及原始基质材料（即砂和煅烧海星）进行的 SEM 图像表明，锰氧化物占据了基质的表面或孔隙，并在基质表面形成了团簇。
