Reducing Nitrate from Water Using Lanthanum-modified Adsorbent: Optimization, Thermodynamics, Kinetics, and Isotherms

IF 1 4区工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY

Iranian Journal of Chemistry & Chemical Engineering-international English Edition Pub Date : 2021-10-19 DOI:10.30492/IJCCE.2021.122311.3998

P. Moradi, Ramin Qanavati, Masumeh Mirzaei Ghaleh Ghobadi

{"title":"Reducing Nitrate from Water Using Lanthanum-modified Adsorbent: Optimization, Thermodynamics, Kinetics, and Isotherms","authors":"P. Moradi, Ramin Qanavati, Masumeh Mirzaei Ghaleh Ghobadi","doi":"10.30492/IJCCE.2021.122311.3998","DOIUrl":null,"url":null,"abstract":"Lanthanum-modified commercial activated carbon (LMAC) adsorbent was synthesized, characterized, and then applied for reducing nitrate from aqueous solutions under various conditions. The extent of nitrate removal depended on four factors: temperature, the aqueous solution pH, initial nitrate concentration, and contact time. The Taguchi approach was used as the method of design for the experiments. Under optimal conditions ( T= 300°C, pH=3, C0=10 ppm, and t= 210 min), the removal percentages and capacity of nitrate adsorption were found to be 71.31%, and 1.43 for activated carbon (AC) and 93.31% and 1.87 for LMAC, respectively. Thermodynamic parameters, including the enthalpy, Gibbs free energy, and entropy, indicated the spontaneous and exothermic nature of the adsorption process. Various isotherms and first and second-order kinetic models were applied to investigate the adsorption process. The pseudo-second-order kinetic model and Langmuir isotherm could well describe the adsorption process.","PeriodicalId":14572,"journal":{"name":"Iranian Journal of Chemistry & Chemical Engineering-international English Edition","volume":"42 1","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Iranian Journal of Chemistry & Chemical Engineering-international English Edition","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.30492/IJCCE.2021.122311.3998","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Lanthanum-modified commercial activated carbon (LMAC) adsorbent was synthesized, characterized, and then applied for reducing nitrate from aqueous solutions under various conditions. The extent of nitrate removal depended on four factors: temperature, the aqueous solution pH, initial nitrate concentration, and contact time. The Taguchi approach was used as the method of design for the experiments. Under optimal conditions ( T= 300°C, pH=3, C0=10 ppm, and t= 210 min), the removal percentages and capacity of nitrate adsorption were found to be 71.31%, and 1.43 for activated carbon (AC) and 93.31% and 1.87 for LMAC, respectively. Thermodynamic parameters, including the enthalpy, Gibbs free energy, and entropy, indicated the spontaneous and exothermic nature of the adsorption process. Various isotherms and first and second-order kinetic models were applied to investigate the adsorption process. The pseudo-second-order kinetic model and Langmuir isotherm could well describe the adsorption process.

查看原文本刊更多论文

使用镧改性吸附剂从水中还原硝酸盐:优化，热力学，动力学和等温线

合成了镧改性商用活性炭(LMAC)吸附剂，对其进行了表征，并将其应用于各种条件下还原水溶液中的硝酸盐。硝酸盐的去除程度取决于四个因素:温度、水溶液pH、硝酸盐初始浓度和接触时间。实验的设计方法采用田口法。在最佳条件(温度300℃，pH=3, C0=10 ppm，时间210 min)下，活性炭对硝酸盐的去除率为71.31%，吸附量为1.43,LMAC为93.31%，吸附量为1.87。热力学参数包括焓、吉布斯自由能和熵，反映了吸附过程的自发和放热性质。采用各种等温线和一、二级动力学模型对吸附过程进行了研究。拟二级动力学模型和Langmuir等温线较好地描述了吸附过程。

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

Iranian Journal of Chemistry & Chemical Engineering-international English Edition CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

2.80

自引率

22.20%

发文量

审稿时长

6-12 weeks

期刊介绍： The aim of the Iranian Journal of Chemistry and Chemical Engineering is to foster the growth of educational, scientific and Industrial Research activities among chemists and chemical engineers and to provide a medium for mutual communication and relations between Iranian academia and the industry on the one hand, and the world the scientific community on the other.