Adsorption performance of calcium-aluminum layered double hydroxides synthesized from waste incineration fly ash for removal Pb(II) from water

IF 3.2 4区工程技术 Q2 CHEMISTRY, APPLIED

Adsorption Science & Technology Pub Date : 2025-12-01 DOI:10.1177/02636174251409011

Zheng Zhang, Xilin Chai, Haiying Wei, Yubing Duan, L. Xu, Z. M. Yang, R Chen

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Abstract

The reduction and resource recovery of waste incineration fly ash represent a central focus of current research initiatives. In this study, Ca-Al-layered double hydroxides (LDHs) were prepared via a coprecipitation method using waste incineration fly ash as a calcium source combined with aluminum chloride. Their Pb 2+ adsorption capacities were compared with commercial LDHs and LDHs synthesized from chemical reagents. Results indicate that the optimal Ca/Al molar ratio for both fly ash-derived LDHs and reagent-synthesized LDHs was 2:1. The Pb 2+ adsorption capacities of fly ash-derived LDHs (FCA2), reagent-synthesized LDHs (CA2), and commercial LDHs (CL) were 1149.78 mg·g −1 , 1024.00 mg·g −1 , and 1069.34 mg·g −1 , respectively. After five regeneration cycles, FCA2 maintained stable adsorption performance, with Pb 2+ removal efficiency exceeding 95%. The synthesized LDHs were characterized by SEM, XRD, FTIR and BET, revealing that the dominant adsorption mechanisms included ion exchange, surface complexation, and precipitation. This study not only proposes a method for high-value resource utilization of waste incineration fly ash but also provides insights for aquatic heavy metal pollution control and hazardous waste management.

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垃圾焚烧飞灰合成钙铝层状双氢氧化物去除水中Pb（II）的吸附性能

垃圾焚烧飞灰的减量化和资源化是当前研究的重点。本研究以垃圾焚烧粉煤灰为钙源，结合氯化铝，采用共沉淀法制备了钙铝层状双氢氧化物（LDHs）。比较了其对pb2 +的吸附能力，并与市售LDHs和化学试剂合成的LDHs进行了比较。结果表明，粉煤灰衍生和试剂合成的LDHs的最佳Ca/Al摩尔比均为2:1。粉煤灰衍生LDHs （FCA2）、试剂合成LDHs （CA2）和商用LDHs （CL）对pb2 +的吸附量分别为1149.78 mg·g−1、1024.00 mg·g−1和1069.34 mg·g−1。经过5次再生循环后，FCA2保持稳定的吸附性能，对pb2 +的去除率超过95%。通过SEM、XRD、FTIR和BET等手段对所合成的低分子量氢氧化钠进行了表征，发现其主要吸附机制为离子交换、表面络合和沉淀。本研究不仅为垃圾焚烧飞灰的高价值资源化利用提供了途径，也为水生重金属污染控制和危险废物管理提供了思路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Adsorption Science & Technology 工程技术-工程：化工

CiteScore

5.00

自引率

10.30%

发文量

181

审稿时长

4.5 months

期刊介绍： Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.

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