Liu Jing, He Lile, Dong Faqin, Hudson-Edwards Karen A
The Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, China; The State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Beijing, 100083, China.
The Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, China.
Chemosphere. 2016 Jun;153:146-54. doi: 10.1016/j.chemosphere.2016.03.044. Epub 2016 Mar 24.
Although the removal of arsenic(V) (As(V)) from solution can be improved by forming metal-bearing coatings on solid media, there has been no research to date examining the relationship between the coating and As(V) sorption performance. Manganese-coated bone char samples with varying concentrations of Mn were created to investigate the adsorption and desorption of As(V) using batch and column experiments. Breakthrough curves were obtained by fitting the Convection-Diffusion Equation (CDE), and retardation factors were used to quantify the effects of the Mn coatings on the retention of As(V). Uncoated bone char has a higher retention factor (44.7) than bone char with 0.465 mg/g of Mn (22.0), but bone char samples with between 5.02 mg/g and 14.5 mg/g Mn have significantly higher retention factors (56.8-246). The relationship between retardation factor (Y) and Mn concentration (X) is Y = 15.1 X + 19.8. Between 0.2% and 0.6% of the sorbed As is desorbed from the Mn-coated bone char at an initial pH value of 4, compared to 30% from the uncoated bone char. The ability of the Mn-coated bone char to neutralize solutions increases with increased amounts of Mn on the char. The results suggest that using Mn-coated bone char in Permeable Reactive Barriers would be an effective method for remediating As(V)-bearing solutions such as acid mine drainage.
虽然通过在固体介质上形成含金属涂层可以提高从溶液中去除五价砷（As(V)）的效果，但迄今为止尚未有研究考察涂层与As(V)吸附性能之间的关系。制备了不同锰浓度的锰涂层骨炭样品，通过批次实验和柱实验研究As(V)的吸附和解吸。通过拟合对流扩散方程（CDE）获得穿透曲线，并使用阻滞因子来量化锰涂层对As(V)保留的影响。未涂层的骨炭具有比含0.465 mg/g锰的骨炭更高的保留因子（44.7），而含5.02 mg/g至14.5 mg/g锰的骨炭样品具有显著更高的保留因子（56.8 - 246）。阻滞因子（Y）与锰浓度（X）之间的关系为Y = 15.1X + 19.8。在初始pH值为4时，从锰涂层骨炭上解吸的吸附态As为0.2%至0.6%，相比之下，从未涂层骨炭上解吸的为30%。锰涂层骨炭中和溶液的能力随着骨炭上锰含量的增加而增强。结果表明，在可渗透反应屏障中使用锰涂层骨炭将是修复含As(V)溶液（如酸性矿山排水）的有效方法。
