Department of Environmental Engineering & Biotechnology, Mokpo National Maritime University, 91 Haeyangdaehak-ro, Mokpo, 58628, South Korea.
Department of Engineering Systems & Environment, University of Virginia, Charlottesville, VA, USA.
Bull Environ Contam Toxicol. 2022 Mar;108(3):518-525. doi: 10.1007/s00128-021-03133-7. Epub 2021 Mar 11.
Used oyster shells are considered a waste product of the seafood industry. Herein, we hypothesize that oyster shells can be used as a raw ingredient to synthesize effective sorbents. This study investigated the lead sorption ability of modified oyster shells [phosphoric-acid treated oyster shell (POS) and oyster shells with phosphoric acid (OS + P)] from water. XRD confirmed the presence of calcium phosphate. Lead removal efficiency as a function of sorbent type was as follows: OS + P > POS > OS. Sorption was quantified effectively using Freundlich isotherms with correlation coefficients ranging from 0.98 to 0.99. The Freundlich parameter values of K and n indicate that POS and OS + P exhibit stronger lead sorption than OS. These results indicate that modified oyster shells with OS + P and POS could be effective sorbents for lead removal from water. Kinetic models were well described by a pseudo-second-order rate constant for all the sorbents.
使用过的牡蛎壳被认为是海鲜行业的一种浪费品。在此，我们假设牡蛎壳可以作为一种原料来合成有效的吸附剂。本研究调查了改性牡蛎壳（磷酸处理牡蛎壳 (POS) 和含磷酸的牡蛎壳 (OS + P)）从水中吸附铅的能力。XRD 证实了磷酸钙的存在。根据吸附剂类型，铅去除效率如下：OS + P > POS > OS。用 Freundlich 等温线有效地定量了吸附作用，相关系数在 0.98 到 0.99 之间。K 和 n 的 Freundlich 参数值表明，POS 和 OS + P 对铅的吸附能力强于 OS。这些结果表明，经过改性的牡蛎壳（OS + P 和 POS）可以作为从水中去除铅的有效吸附剂。所有吸附剂的动力学模型都很好地用伪二阶速率常数来描述。
