Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Environ Pollut. 2011 Jul;159(7):1763-8. doi: 10.1016/j.envpol.2011.04.017. Epub 2011 May 6.
The potential of using mollusk shell powder in aragonite (razor clam shells, RCS) and calcite phase (oyster shells, OS) to remove Pb(2+), Cd(2+) and Zn(2+) from contaminated water was investigated. Both biogenic sorbents displayed very high sorption capacities for the three metals except for Cd on OS. XRD, SEM and XPS results demonstrated that surface precipitation leading to crystal growth took place during sorption. Calcite OS displayed a remarkably higher sorption capacity to Pb than aragonite RCS, while the opposite was observed for Cd. However, both sorbents displayed similar sorption capacities to Zn. These could be due to the different extent of matching in crystal lattice between the metal bearing precipitate and the substrates. The initial pH of the solution, sorbent's dosage and grain size affected the removal efficiency of the heavy meals significantly, while the organic matter in mollusk shells affected the removal efficiency to a lesser extent.
研究了利用贝类贝壳粉末（ razor clam shells，RCS）中的文石相和牡蛎壳（oyster shells，OS）中的方解石相去除受污染水中的 Pb(2+)、Cd(2+)和 Zn(2+)的潜力。两种生物吸附剂对除 OS 上的 Cd 外的三种金属均表现出非常高的吸附能力。XRD、SEM 和 XPS 结果表明，在吸附过程中发生了表面沉淀导致晶体生长。与文石相 RCS 相比，方解石 OS 对 Pb 的吸附容量显著更高，而 Cd 则相反。然而，两种吸附剂对 Zn 的吸附容量相似。这可能是由于含金属沉淀物与基质之间的晶格匹配程度不同。溶液的初始 pH 值、吸附剂的用量和粒径显著影响重金属的去除效率，而贝类壳中的有机物对去除效率的影响较小。
