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_f 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.

用过的牡蛎壳被认为是海鲜行业的废物。在此，我们假设牡蛎壳可用作合成有效吸附剂的原料。本研究调查了改性牡蛎壳[磷酸处理的牡蛎壳 (POS) 和磷酸处理的牡蛎壳 (OS + P)] 从水中的铅吸附能力。XRD证实了磷酸钙的存在。作为吸附剂类型函数的铅去除效率如下：OS + P > POS > OS。使用相关系数范围为 0.98 至 0.99 的 Freundlich 等温线有效地量化吸附。K _f的 Freundlich 参数值和 n 表示 POS 和 OS + P 表现出比 OS 更强的铅吸附。这些结果表明，具有 OS + P 和 POS 的改性牡蛎壳可能是去除水中铅的有效吸附剂。动力学模型通过所有吸附剂的伪二级速率常数很好地描述。