A case study on cross-linked formaldehyde-chitosan adsorbent to the removal of Zn (II) and Pb (II) ions from wastewater solution: Equilibrium isotherms, kinetics, and desorption studies

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-03-19 DOI:10.1016/j.molliq.2025.127417

Hari Mohan Meena , Shrikant Kukreti , P.S. Jassal

{"title":"A case study on cross-linked formaldehyde-chitosan adsorbent to the removal of Zn (II) and Pb (II) ions from wastewater solution: Equilibrium isotherms, kinetics, and desorption studies","authors":"Hari Mohan Meena , Shrikant Kukreti , P.S. Jassal","doi":"10.1016/j.molliq.2025.127417","DOIUrl":null,"url":null,"abstract":"<div><div>In this study, biodegradable natural polymer chitosan was modified with formaldehyde to prepare cross-linked formaldehyde chitosan nanoparticles (FD-CS). The morphology of the adsorbent indicates an amide (R-CONH<sub>2</sub>) and two hydroxyl (<img>OH) functional groups were present in respective positions. Further in this work, a case study on the removal of Zn (II) and Pb (II) metal ions was investigated using a cross-linked FD-CS adsorbent, The adsorption capacity of Zn (II) ion was found to be maximum i.e., 117.12 mg/g followed by Pb (II) 108.23 mg/g at the pH 4.0 and 25 °C. The adsorption results showed up to 94.2 % and 84.1 % of Zn (II) and Pb (II) were removed with Initial metal ions Concentrations of 0.81 and 0.68 g/L, respectively. The Langmuir isotherm and D-R model showed a well-fitted adsorption parameter for both Zn (II) and Pb (II) ions, whereas the pseudo-first-order and pseudo-second-order models well followed for Zn (II) ions, and the second-order and Elovich models were followed as well for Pb (II) ions in all experiments. The Zn and Pb ions are estimated by 797 VA anodic linear sweep voltammetry Computrace. The desorption and reusability of Zn (II) and Pb (II) adsorbed onto the FD-CS nanocomposite were examined using various desorbing agents, such as NH<sub>4</sub>OH/NH4Cl or NaOH, along with M HNO<sub>3</sub> or 0.1 M HCl solution. The results indicate that the FD-CS nanocomposite is an effective and economical adsorbent for removing hazardous heavy metals from wastewater.</div></div>","PeriodicalId":371,"journal":{"name":"Journal of Molecular Liquids","volume":"427 ","pages":"Article 127417"},"PeriodicalIF":5.3000,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Molecular Liquids","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167732225005847","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

In this study, biodegradable natural polymer chitosan was modified with formaldehyde to prepare cross-linked formaldehyde chitosan nanoparticles (FD-CS). The morphology of the adsorbent indicates an amide (R-CONH₂) and two hydroxyl (OH) functional groups were present in respective positions. Further in this work, a case study on the removal of Zn (II) and Pb (II) metal ions was investigated using a cross-linked FD-CS adsorbent, The adsorption capacity of Zn (II) ion was found to be maximum i.e., 117.12 mg/g followed by Pb (II) 108.23 mg/g at the pH 4.0 and 25 °C. The adsorption results showed up to 94.2 % and 84.1 % of Zn (II) and Pb (II) were removed with Initial metal ions Concentrations of 0.81 and 0.68 g/L, respectively. The Langmuir isotherm and D-R model showed a well-fitted adsorption parameter for both Zn (II) and Pb (II) ions, whereas the pseudo-first-order and pseudo-second-order models well followed for Zn (II) ions, and the second-order and Elovich models were followed as well for Pb (II) ions in all experiments. The Zn and Pb ions are estimated by 797 VA anodic linear sweep voltammetry Computrace. The desorption and reusability of Zn (II) and Pb (II) adsorbed onto the FD-CS nanocomposite were examined using various desorbing agents, such as NH₄OH/NH4Cl or NaOH, along with M HNO₃ or 0.1 M HCl solution. The results indicate that the FD-CS nanocomposite is an effective and economical adsorbent for removing hazardous heavy metals from wastewater.

Abstract Image

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.