Performance of metakaolin-based geopolymer molecular sieve microspheres on dynamic recovery of Cu (II)

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL Applied Clay Science Pub Date : 2024-05-19 DOI:10.1016/j.clay.2024.107423

Shiyong Li , Qianyi Yang , Quan Ye , Xingfa Deng , Qiaoqiao Su , Xuemin Cui

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Abstract

This study reports the in-situ transformation of geopolymers into molecular sieve using a method with mild conditions. The application of geopolymer zeolites for dynamic adsorption in continuous fixed beds has been less studied, and the application of adsorbents after adsorption has been less studied. Different metakaolin-based geopolymer molecular sieve microspheres (NaA-MSM, SOD-MSM) were prepared by in-situ conversion of metakaolin as raw material and NaOH as an alkali activator. The continuous fixed-bed adsorption performance was evaluated by varying the influent flow rate, initial metal concentration, and adsorbent dosage. The maximum adsorption capacities of NaA-MSM and SOD-MSM for Cu (II) were 698.14 and 523.84 mg·g⁻¹, respectively. In the simulated solution of real lake water, the adsorption capacities of NaA-MSM and SOD-MSM for Cu (II) were 202.94 and 154.97 mg·g⁻¹, respectively. The results show that the synthesized molecular sieve is an excellent adsorbent for Cu (II)-containing wastewater, and the application design of recycling heavy metals in wastewater by adsorption technology and degrading dyes has been successfully constructed.

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偏高岭土基土工聚合物分子筛微球在动态回收铜 (II) 方面的性能

本研究报告采用一种条件温和的方法，将土工聚合物原位转化为分子筛。关于土工聚合物沸石在连续固定床动态吸附中的应用以及吸附后吸附剂的应用研究较少。以偏高岭土为原料，NaOH 为碱活化剂，原位转化制备了不同的偏高岭土基土工聚合物分子筛微球（NaA-MSM、SOD-MSM）。通过改变进水流量、初始金属浓度和吸附剂用量，对连续固定床吸附性能进行了评估。NaA-MSM 和 SOD-MSM 对铜（II）的最大吸附容量分别为 698.14 和 523.84 mg-g-1。在真实湖水的模拟溶液中，NaA-MSM 和 SOD-MSM 对 Cu (II) 的吸附容量分别为 202.94 和 154.97 mg-g-1。结果表明，合成的分子筛是含 Cu (II) 废水的优良吸附剂，并成功构建了利用吸附技术回收废水中重金属和降解染料的应用设计。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...