This work aims to valorize the solid waste resulting from the extraction of essential oils from three species of Dittrichia plants (viscosa, graveolens and crithmoides). The study includes the characterization of these biomaterials and their use in the elimination of the cadmium ion. For each species, taken in the raw state and then in the exhausted state after hydrodistillation, the studies were conducted on the leaves and flowers on the one hand and on the whole aerial part on the other. The results of the surface characterization (scanning electron microscopy, Fourier transform infrared spectroscopy, point of zero charge and Boehm titration) showed that these residual solids had a low surface area, but revealed the existence of basic and acidic functions ranging from 0.16 to 0.42 meq.g⁻¹ and from 0.65 to 1.90 meq.g⁻¹, respectively. Adsorption experiments showed that solid adsorption capacities ranged from 10.61 to 16.92 mg.g⁻¹ for the raw materials and from 4.72 to 13.16 mg.g⁻¹ for the exhausted materials. Sips three-parameter equation was successfully used to model all adsorption isotherms. The retention of cadmium increased from 4.73 to 16.92 mg.g⁻¹ when varying the acid content from 0.65 to 1.90 meq.g⁻¹. The amount of retained cadmium increased significantly by increasing the pH from 2 to 8 and the temperature from 20 to 60 °C. This work clearly shows the relationship between the surface function content and the retention capacity of cadmium ions by biomaterials.

这项工作旨在稳定物价的精油从三个品种的提取产生的固体废物Dittrichia植物（VISCOSA，天竺葵和crithmoides）。这项研究包括对这些生物材料的表征及其在消除镉离子中的用途。对于每种物种，在进行水蒸馏后分别以原始状态和枯竭状态进行采集，一方面进行了叶子和花朵的研究，另一方面进行了整个空中部分的研究。表面表征的结果（扫描电子显微镜，傅立叶变换红外光谱，零电荷点和Boehm滴定）表明，这些残留固体具有较低的表面积，但显示出存在的碱性和酸性官能度为0.16至0.42 meq .g ^-1和0.65至1.90 meq.g ^-1。吸附实验表明，固体吸附容量为10.61至16.92 mg.g ^-1原料的消耗量为4.72至13.16 mg.g ^-1。Sips三参数方程式已成功用于模拟所有吸附等温线。镉的保留增加从4.73到16.92 mg.g ^-1改变为0.65，酸含量1.90 meq.g时^-1。通过将pH从2升高到8和将温度从20升高到60°C，镉的保留量显着增加。这项工作清楚地表明了生物材料的表面功能含量与镉离子保留能力之间的关系。