Deep Removal of Fluoride by Highly Activated Magnesium Oxide

IF 4.8 Q1 ENVIRONMENTAL SCIENCES

ACS ES&T water Pub Date : 2024-06-05 DOI:10.1021/acsestwater.4c00403

Xuepu Cao, Yadong Zhong, Heng Zhang, Hua Zhao, Chen Meng, Lilong Zhou* and Runjing Liu*,

{"title":"Deep Removal of Fluoride by Highly Activated Magnesium Oxide","authors":"Xuepu Cao, Yadong Zhong, Heng Zhang, Hua Zhao, Chen Meng, Lilong Zhou* and Runjing Liu*, ","doi":"10.1021/acsestwater.4c00403","DOIUrl":null,"url":null,"abstract":"Activated MgO was prepared from calcination of alkaline magnesium carbonate for the removal of a low concentration of fluorion. MgO calcinated at 500 °C showed the highest adsorption capacity and fastest adsorption rate for fluorion. The removal rate of F– reached 98.35% with the maximum adsorption capacity of 19.3 mg·g–1 with an initial F– concentration of 20 mg/L in a wide range of pH. The adsorption of F– by MgO is less affected by Cl–, CO32–, and HCO3–. SO42– and NO3– have a negative effect on the adsorption of F– on activated MgO. The adsorption process of F– on MgO follows the proposed second-order kinetic model and Langmuir isotherm model. The adsorption of F– on activated MgO has two stages. Surface and intraparticle diffusion are the rate limiting steps in the first and second stage, respectively. FTIR and XPS results of MgO and used MgO inferred that O–H···F bonds formed between F– and MgO during the defluorination process.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"4 6","pages":"2756–2763"},"PeriodicalIF":4.8000,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS ES&T water","FirstCategoryId":"1085","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsestwater.4c00403","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

Activated MgO was prepared from calcination of alkaline magnesium carbonate for the removal of a low concentration of fluorion. MgO calcinated at 500 °C showed the highest adsorption capacity and fastest adsorption rate for fluorion. The removal rate of F^– reached 98.35% with the maximum adsorption capacity of 19.3 mg·g^–1 with an initial F^– concentration of 20 mg/L in a wide range of pH. The adsorption of F^– by MgO is less affected by Cl^–, CO₃^2–, and HCO₃^–. SO₄^2– and NO₃^– have a negative effect on the adsorption of F^– on activated MgO. The adsorption process of F^– on MgO follows the proposed second-order kinetic model and Langmuir isotherm model. The adsorption of F^– on activated MgO has two stages. Surface and intraparticle diffusion are the rate limiting steps in the first and second stage, respectively. FTIR and XPS results of MgO and used MgO inferred that O–H···F bonds formed between F^– and MgO during the defluorination process.

Abstract Image

查看原文本刊更多论文

利用高活性氧化镁深度去除氟化物

通过煅烧碱性碳酸镁制备了活性氧化镁，用于去除低浓度的氟离子。在 500 °C 下煅烧的氧化镁对氟离子的吸附容量最大，吸附速度最快。在较宽的 pH 值范围内，初始 F- 浓度为 20 mg/L 时，F-的去除率达到 98.35%，最大吸附容量为 19.3 mg-g-1。氧化镁对 F- 的吸附受 Cl-、CO32- 和 HCO3-的影响较小。SO42- 和 NO3- 对活性氧化镁吸附 F- 有负面影响。F- 在 MgO 上的吸附过程遵循所提出的二阶动力学模型和 Langmuir 等温线模型。F- 在活化氧化镁上的吸附过程分为两个阶段。表面扩散和颗粒内扩散分别是第一和第二阶段的限制速率步骤。氧化镁和使用过的氧化镁的傅立叶变换红外光谱和 XPS 结果表明，在脱氟过程中 F- 与氧化镁之间形成了 O-H-F 键。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

ACS ES&T water

CiteScore

5.40

自引率

0.00%

发文量