Nanoarchitectured Biocomposites: Synergistic Halloysite-Chitin Magnets for Sustainable Cadmium (II) Mitigation in Water

IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED
Elaheh NaserNasir, Hossein Parvaresh, Fatemeh S. Mohseni-Shahri, Farid Moeinpour, Mohsen Dehghani Ghanatghestani
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Abstract

A novel functionalized halloysite-nanochitin magnetic biocomposite, NiFe2O4-HNTs-chitin, was synthesized to effectively remove Cd (II) ions from aqueous media. The morphology and structure of the nanoadsorbent were analyzed using TEM, SEM, XRD, FT-IR, BET, EDS, and VSM. The adsorption studies demonstrated a peak Cd (II) adsorption capacity of 400.00 mg/g under conditions of 25°C, pH 6, using 0.05 g/100 mL of NiFe2O4-HNTs-chitin, with equilibrium achieved within just 10 min. Adsorption kinetics follow a pseudo-second-order model, and the isothermal data corresponded with the Langmuir model, suggesting monolayer adsorption on the adsorbent surface and a chemically controlled rate-determining step. The thermodynamic analysis showed that the uptake process is both spontaneous and exothermic (ΔH = −511.028 kJ/mol, ΔG = −32.78 kJ/mol). Remarkably, the adsorbent maintained high uptake and release effectiveness even after four cycles, with the primary mechanism of Cd (II) removal attributed to chelation through oxygen (O) and nitrogen (N) atoms. These results demonstrate that NiFe2O4-HNTs-chitin is a highly efficient and recyclable sorbent for removing Cd (II) ions from water, with significant practical applicability.

纳米结构生物复合材料:协同高岭土-几丁质磁体对水中镉(II)的可持续缓解
制备了一种新型功能化高岭土-纳米甲壳素磁性生物复合材料nife2o4 - hnts -甲壳素,以有效去除水中介质中的Cd (II)离子。采用TEM、SEM、XRD、FT-IR、BET、EDS和VSM对纳米吸附剂的形貌和结构进行了分析。吸附研究表明,在25°C、pH 6、0.05 g/100 mL nife2o4 - hnts -甲壳素的条件下,Cd (II)的峰值吸附量为400.00 mg/g,只需10 min即可达到平衡。吸附动力学符合拟二阶模型,等温数据符合Langmuir模型,表明吸附剂表面的单层吸附和化学控制的速率决定步骤。热力学分析表明,吸附过程是自发的,也是放热的(ΔH =−511.028 kJ/mol, ΔG =−32.78 kJ/mol)。值得注意的是,即使经过4个循环,吸附剂仍保持了较高的吸收和释放效率,其去除Cd (II)的主要机制是通过氧(O)和氮(N)原子进行螯合。这些结果表明,nife2o4 - hnts -甲壳素是一种高效、可回收的水中Cd (II)离子吸附剂,具有较强的实用性。
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来源期刊
Applied Organometallic Chemistry
Applied Organometallic Chemistry 化学-无机化学与核化学
CiteScore
7.80
自引率
10.30%
发文量
408
审稿时长
2.2 months
期刊介绍: All new compounds should be satisfactorily identified and proof of their structure given according to generally accepted standards. Structural reports, such as papers exclusively dealing with synthesis and characterization, analytical techniques, or X-ray diffraction studies of metal-organic or organometallic compounds will not be considered. The editors reserve the right to refuse without peer review any manuscript that does not comply with the aims and scope of the journal. Applied Organometallic Chemistry publishes Full Papers, Reviews, Mini Reviews and Communications of scientific research in all areas of organometallic and metal-organic chemistry involving main group metals, transition metals, lanthanides and actinides. All contributions should contain an explicit application of novel compounds, for instance in materials science, nano science, catalysis, chemical vapour deposition, metal-mediated organic synthesis, polymers, bio-organometallics, metallo-therapy, metallo-diagnostics and medicine. Reviews of books covering aspects of the fields of focus are also published.
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