Cadmium (Cd${}^{+2}$) is a major heavy metal pollutant and it causes many serious effects on the environment. The established Cd${}^{+2}$ removal methods are expensive and produce secondary waste, while biosorption is a potential alternative. In view of this, Sesuvium portulacastrum (L.) is explored, which is a facultative halophyte and is known to survive under both salt and heavy metal stress conditions. Using the dried powder of Sesuvium biomass, two independent biosorbents were prepared including Con${}^{\mathrm{B}}$ (grown under control condition) and NaCl${}^{\mathrm{B}}$ (grown under 200 mM NaCl) and their Fourier-transform infrared spectroscopy (FTIR) indicated significant alteration in peak position of various functional groups. The Cd${}^{+2}$ biosorption capacity in NaCl${}^{\mathrm{B}}$ (306 mg g⁻¹) was found higher than Con${}^{\mathrm{B}}$ (203 mg g⁻¹). The kinetic and equilibrium studies revealed the contribution of intraparticle diffusion in the biosorption process of both the biosorbents. Further, the higher intraparticle diffusion rate constant indicated the faster biosorption process in NaCl${}^{\mathrm{B}}$. The experimental data correlated better with Freundlich equilibrium isotherm (${\mathit{r}}^2=0.95$ for Con${}^{\mathrm{B}}$ and ${\mathit{r}}^2=0.98$ for NaCl${}^{\mathrm{B}}$) than Langmuir, indicating multilayer biosorption and heterogeneity within the biosorbents. Scanning electron microscope (SEM) imaging indicated that the rough surface of Con${}^{\mathrm{B}}$ changed to smooth after Cd${}^{+2}$ biosorption, with lesser number of pores. In case of NaCl${}^{\mathrm{B}}$, Cd${}^{+2}$ biosorption narrowed the vertical channels. EDX (Energy Dispersive X-ray) spectrum validated the Cd${}^{+2}$ binding in both Con${}^{\mathrm{B}}$ and NaCl${}^{\mathrm{B}}$. Taken together, the study highlighted NaCl-treated Sesuvium as an eco-friendly green biosorbent for Cd${}^{+2}$ removal from aqueous solutions.

镉（Cd${}^{+2}$)是一种主要的重金属污染物，对环境造成许多严重的影响。既定的镉${}^{+2}$去除方法昂贵且会产生二次废物，而生物吸附是一种潜在的替代方法。有鉴于此，探索了马齿苋（Sesuvium portulacastrum，L.），这是一种兼性盐生植物，已知在盐和重金属胁迫条件下都能存活。使用Sesuvium生物质的干燥粉末，制备了两种独立的生物吸附剂，包括 Con${}^{\mathrm{乙}}$ （在控制条件下生长）和 NaCl${}^{\mathrm{乙}}$（在 200 mM NaCl 下生长）及其傅里叶变换红外光谱 (FTIR) 表明各种官能团的峰位置发生了显着变化。镉${}^{+2}$ 在 NaCl 中的生物吸附能力${}^{\mathrm{乙}}$(306 mg g ^-1 ) 被发现高于 Con${}^{\mathrm{乙}}$(203mg g ^-1 )。动力学和平衡研究揭示了颗粒内扩散在两种生物吸附剂的生物吸附过程中的贡献。此外，较高的颗粒内扩散速率常数表明 NaCl 中的生物吸附过程较快${}^{\mathrm{乙}}$. 实验数据与 Freundlich 平衡等温线相关性更好（${\mathit{r}}^2=0.95$ 骗局${}^{\mathrm{乙}}$ 和 ${\mathit{r}}^2=0.98$ 氯化钠${}^{\mathrm{乙}}$) 比朗缪尔，表明生物吸附剂内的多层生物吸附和异质性。扫描电子显微镜 (SEM) 成像表明 Con 的粗糙表面${}^{\mathrm{乙}}$ Cd后变为平滑${}^{+2}$生物吸附，具有较少数量的孔。在氯化钠的情况下${}^{\mathrm{乙}}$, 镉${}^{+2}$生物吸附使垂直通道变窄。EDX（能量色散 X 射线）光谱验证了 Cd${}^{+2}$ 在两个 Con 中绑定${}^{\mathrm{乙}}$ 和氯化钠${}^{\mathrm{乙}}$. 总之，该研究强调了 NaCl 处理的Sesuvium作为一种环保的 Cd 绿色生物吸附剂${}^{+2}$ 从水溶液中去除。