Here is synthesized low-cost and green core-shell ZSM-5 zeolite@ layered double hydroxides (ZSM-5@LDH) via a simple in situ coprecipitation method. The structure of the sorbent was investigated using X-ray diffraction, scanning electron microscopy, Fourier transforms infrared, Brunauer–Emmett–Teller, Barret-Joyner-Halenderm, and transmission electron microscope. The ZSM-5@LDH was used for the removal of heavy metal ions include Pb(II), Zn(II), Cd(II), and Cu(II) and oxyanions include As(V), Cr(VI), Se(VI) from aqueous solutions. Synthesized sorbent showed selectivity for removing Pb(II) and As(V) ions. The kinetics models (pseudo-first-order and the pseudo-second-order models) and adsorption isotherms models (Langmuir and Freundlich models) of sorbent were studied to evaluate the performance of their practical application. The ZSM-5@LDH for removal of Pb(II) and As(V) exhibits a high adsorption capacity (546.25 and 411.41 mg g⁻¹, respectively) and very high distribution coefficient (K_d) values (4.07× 10⁴ and 8.0 × 10⁶ ml g⁻¹, respectively), which place it at the top of materials known for the removal of Pb(II) and As(V). As a result, this study indicates that the ZSM-5@LDH may be an ideal material for the selective removal of Pb(II) and As(V).

中文翻译：

---

层状双氢氧化物修饰沸石作为去除有毒金属离子的有效吸附剂的合成与表征

本文通过简单的原位共沉淀法合成了低成本的绿色核壳型 ZSM-5 沸石@层状双氢氧化物 (ZSM-5@LDH)。使用 X 射线衍射、扫描电子显微镜、傅里叶变换红外、Brunauer-Emmett-Teller、Barret-Joyner-Halenderm 和透射电子显微镜研究吸附剂的结构。ZSM-5@LDH 用于去除重金属离子包括 Pb(II)、Zn(II)、Cd(II) 和 Cu(II)，氧阴离子包括 As(V)、Cr(VI)、Se (VI) 来自水溶液。合成吸附剂显示出去除 Pb(II) 和 As(V) 离子的选择性。研究了吸附剂的动力学模型（拟一级和拟二级模型）和吸附等温线模型（Langmuir 和 Freundlich 模型），以评估其实际应用的性能。^-1 ) 和非常高的分配系数 ( K _d ) 值（分别为 4.07× 10 ⁴和 8.0 × 10 ⁶  ml g ^-1），这使其位于已知去除 Pb(II) 的材料的顶部和 As(V)。因此，本研究表明 ZSM-5@LDH 可能是选择性去除 Pb(II) 和 As(V) 的理想材料。