Highly stable natural zeolite/montmorillonite hybrid microspheres with green preparation process for efficient adsorption of ammonia nitrogen in wastewater

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2023-10-01 DOI:10.1016/j.clay.2022.106787

Qihang Zhao , Chenhui Long , Zhiyi Jiang , Weiwei Yin , Aidong Tang , Huaming Yang

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引用次数: 2

Abstract

Adsorption technology has attracted increasing attention for the remediation of ammonia nitrogen pollutions from landfill leachate. However, developing effective adsorbing materials with low cost, outstanding activities and long-term stabilities in the aqueous environment remains a significant challenge. Zeolite with high ability of cation exchange is significantly preferable for the removal of ammonia nitrogen. Herein, a novel polyvinyl alcohol (PVA) thin membrane modified natural zeolite and Na-montmorillonite (NaMt) hybrid microspheres (denoted as PVA-(zeolite/Na-Mt)) adsorbent is successfully synthesized by a facile granulation and impregnation method. The adsorption experiments reveal that the multicomponent PVA-(zeolite/Na-Mt) microspheres show higher removal efficiency (98.16%) for ammonia nitrogen within 40 h even at a wide pH (3.0–11.0) and temperature (10–30 °C) range. Meanwhile, the spent PVA-(zeolite/Na-Mt) microspheres with high stability in aqueous environment for more than 20 days originates from the modification of the PVA molecule and enhanced adsorption performance that is beneficial for practical applications in the wastewater remediation field.

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高稳定天然沸石/蒙脱土杂化微球绿色制备工艺高效吸附废水中氨氮

吸附技术在垃圾渗滤液氨氮污染的修复中越来越受到重视。然而，开发成本低、活性高、在水环境中长期稳定的有效吸附材料仍然是一个重大挑战。高阳离子交换能力的沸石对氨氮的去除效果显著。本文采用易造粒浸渍法制备了一种新型聚乙烯醇(PVA)薄膜改性天然沸石和钠蒙脱土(NaMt)杂化微球(简称PVA-(沸石/Na-Mt))吸附剂。吸附实验表明，在较宽的pH(3.0 ~ 11.0)和温度(10 ~ 30℃)范围内，多组分PVA-(沸石/Na-Mt)微球对氨氮的去除率在40 h内达到了98.16%。同时，废液中的PVA-(沸石/Na-Mt)微球在水环境中具有20天以上的高稳定性，源于PVA分子的改性和吸附性能的增强，有利于在废水修复领域的实际应用。

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

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...