{"title":"Enhanced phosphate removal by La(OH)3 embedded sodium alginate aerogel composites: Batch and column studies","authors":"Zhuo Zhao, Yue Yin, Guanglei Wang, Changqing Liu","doi":"10.1016/j.jwpe.2024.106540","DOIUrl":null,"url":null,"abstract":"<div><div>The enhanced removal of phosphate (P) from wastewater is a major challenge for eutrophication control in natural water bodies. Adsorption as a cost-efficient technology has been applied for excessive P removal from wastewater, however, the stability and recyclability of the adsorbents are still challenging. In this study, La(OH)<sub>3</sub> was embedded inside the porous sodium alginate aerogel to synthesize a novel millimeter-sized aerogel (LA) for efficient P removal with high stability. Static experiments revealed that the adsorption of P by LA is more consistent with the PSO kinetic model and the Langmuir model; the suitable pH range for P adsorption is wide, and the co-existing substances have little effect on P removal. Specifically, the maximum Langmuir adsorption capacity of LA reached up to 11.6 mg/g at 288 K. The exhausted LA could be effectively regenerated and maintained 81.7 % of its initial adsorption capacity after 5 adsorption-desorption cycles. Regeneration experiments revealed that LA maintained high stability, which could be easily recycled in real operation. The adsorption mechanism of P onto LA was revealed by SEM, BET, XRD, FTIR, and XPS analysis. The predominant pathway for P removal was confirmed to be the inner-sphere complexation between P and La. In addition, the column study exhibited that LA could be used as the column filler to effectively remove P through continuous filtration. Overall, the above results proved LA to be a promising adsorbent for efficient P removal in complex water environments.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"69 ","pages":"Article 106540"},"PeriodicalIF":6.3000,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of water process engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214714424017720","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The enhanced removal of phosphate (P) from wastewater is a major challenge for eutrophication control in natural water bodies. Adsorption as a cost-efficient technology has been applied for excessive P removal from wastewater, however, the stability and recyclability of the adsorbents are still challenging. In this study, La(OH)3 was embedded inside the porous sodium alginate aerogel to synthesize a novel millimeter-sized aerogel (LA) for efficient P removal with high stability. Static experiments revealed that the adsorption of P by LA is more consistent with the PSO kinetic model and the Langmuir model; the suitable pH range for P adsorption is wide, and the co-existing substances have little effect on P removal. Specifically, the maximum Langmuir adsorption capacity of LA reached up to 11.6 mg/g at 288 K. The exhausted LA could be effectively regenerated and maintained 81.7 % of its initial adsorption capacity after 5 adsorption-desorption cycles. Regeneration experiments revealed that LA maintained high stability, which could be easily recycled in real operation. The adsorption mechanism of P onto LA was revealed by SEM, BET, XRD, FTIR, and XPS analysis. The predominant pathway for P removal was confirmed to be the inner-sphere complexation between P and La. In addition, the column study exhibited that LA could be used as the column filler to effectively remove P through continuous filtration. Overall, the above results proved LA to be a promising adsorbent for efficient P removal in complex water environments.
加强去除废水中的磷酸盐（P）是控制自然水体富营养化的一大挑战。吸附作为一种具有成本效益的技术，已被用于去除废水中的过量磷酸盐，然而，吸附剂的稳定性和可回收性仍然是一个挑战。本研究将 La(OH)3 嵌入多孔海藻酸钠气凝胶中，合成了一种新型毫米级气凝胶（LA），可高效、稳定地去除 P。静态实验表明，LA对P的吸附更符合PSO动力学模型和Langmuir模型；P吸附的适宜pH范围较宽，共存物质对P的去除影响较小。具体而言，在 288 K 条件下，LA 的最大朗缪尔吸附容量可达 11.6 mg/g；耗尽的 LA 可有效再生，并在 5 次吸附-解吸循环后保持其初始吸附容量的 81.7%。再生实验表明，LA 保持了很高的稳定性，在实际操作中很容易回收利用。通过 SEM、BET、XRD、FTIR 和 XPS 分析，揭示了 P 在 LA 上的吸附机理。经证实，去除 P 的主要途径是 P 与 La 之间的内球络合。此外，柱研究表明，LA 可用作柱填料，通过连续过滤有效去除 P。总之，上述结果证明，LA 是一种有望在复杂水环境中高效去除 P 的吸附剂。
期刊介绍：
The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
