Biosorption experiment from aqueous solutions containing known amount of rare earth elements (REEs) using pre-treated Buccinum tenuissimum shell was explored to evaluate the efficiency of shell biomass as sorbent for REEs. In this work, four kinds of sieved shell samples: (a) "Ground original sample", (b) "Heat-treatment (480°C, 6 hours) sample", (c) "Heat-treatment (950°C, 6 hours) sample" and (d) "Heat-treatment (950°C, 6 hours) and water added sample" were used. Furthermore, to confirm the characteristics of the shell biomass, the crystal structure, the surface morphology, and the specific surface area of these shell samples were determined. Consequently, the following matters have been mainly clarified. (1) The crystal structure of the shell biomass was transformed from aragonite (CaCO(3)) into calcite (CaCO(3)) phase by heat-treatment (480°C, 6 hours); then mainly transformed into calcium oxide (CaO) by heat-treatment (950°C, 6 hours), and calcium hydroxide (Ca(OH)(2)) by heat-treatment (950°C, 6 hours) and adding water. (2) The shell biomass showed excellent sorption capacity for lanthanides. (3) Adsorption isotherms using the shell biomass can be described by Langmuir and Freundlich isotherms satisfactorily for lanthanides except "heat-treatment (950°C, 6 hours) sample". (4) Shell biomass (usually treated as waste material) can be an efficient sorbent for lanthanides in future.

中文翻译：

---

使用预处理的 Buccinum tenuissimum 壳生物质从水溶液中生物吸附镧系元素。

使用预处理的 Buccinum tenuissimum 壳对含有已知量稀土元素 (REE) 的水溶液进行生物吸附实验，以评估壳生物质作为 REE 吸附剂的效率。在这项工作中，四种筛分的贝壳样品：（a）“研磨原始样品”，（b）“热处理（480°C，6小时）样品”，（c）“热处理（950°C，6小时）样品”，（c）“热处理（950°C，6小时）样品”。使用(d)“热处理(950℃、6小时)加水样品”。此外，为了确认壳生物质的特征，测定了这些壳样品的晶体结构、表面形态和比表面积。据此，主要明确了以下事项。(1)通过热处理(480℃，6小时)，壳生物质的晶体结构由文石(CaCO(3))相转变为方解石(CaCO(3))相；然后通过热处理（950℃，6小时）主要转化为氧化钙（CaO），通过热处理（950℃，6小时）并加水主要转化为氢氧化钙（Ca(OH)(2)）。(2)壳生物质对镧系元素表现出优异的吸附能力。(3)使用壳生物质的吸附等温线可以通过Langmuir和Freundlich等温线令人满意地描述对于镧系元素，除了“热处理(950℃，6小时)样品”之外。（4）壳类生物质（通常作为废料处理）未来可以成为稀土元素的高效吸附剂。