Synthesis of novel EDTA-modified aluminum oxide for improved removal of heavy metal in contaminated water

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-05-25 DOI:10.1016/j.materresbull.2025.113578

Van Doan Nguyen, Anh-Tuan Vu

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Abstract

In this study, Al₂O₃ with a large surface area and a porous structure was chemically modified by ethylenediaminetetraacetic acid (EDTA) using the biopolymer poly(vinyl alcohol) (PVA) as a binder to prepare the novel Al₂O₃/PVA-EDTA nanocomposite for enhanced Pb²⁺ adsorption. The Pb²⁺ removal reached a steady state within the initial 10 min. Under optimal conditions, the removal efficiency and sorption capacity were 87.34 % and 209.61 mg/g with a rate constant of 0.005 g.mg^-1.min^-1. The adsorption was most compatible with the Langmuir isotherm with q_max of 467.29 mg/g. The influence of other ions such as Cu²⁺, Cd²⁺, Fe³⁺, and Ni²⁺ on the removal efficiency was also examined. The Pb²⁺ removal mechanism was involved in electrostatic interactions, coordinative bonding, and complexation with EDTA, which was confirmed by FT-IR analysis. Moreover, the Pb²⁺ ions were effectively re-adsorbed onto the adsorbent after the 5^th cycle, corresponding to 97.65 % for the first cycle.

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新型edta改性氧化铝的合成及对水中重金属去除效果的影响

在本研究中，以生物聚合物聚乙烯醇（PVA）为粘合剂，对具有大表面积和多孔结构的Al2O3进行了乙二胺四乙酸（EDTA）的化学修饰，制备了新型的Al2O3/PVA-EDTA纳米复合材料，以增强Pb2+的吸附。在最佳条件下，Pb2+的去除率为87.34%，吸附量为209.61 mg/g，速率常数为0.005 g.mg-1.min-1。吸附最符合Langmuir等温线，qmax为467.29 mg/g。考察了Cu2+、Cd2+、Fe3+、Ni2+等离子对去除率的影响。FT-IR分析证实了Pb2+的去除机制涉及静电相互作用、配位键和与EDTA的络合作用。在第5次循环后，Pb2+离子被有效地重新吸附到吸附剂上，第1次循环的吸附率为97.65%。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.