Cellulose –Polyvinylalcohol supported magnetic nanocomposites from lentil husk for sequestration of cationic dyes from the aqueous solution: Kinetics, isotherm and reusability studies

IF 3.5 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology Pub Date : 2025-02-01 DOI:10.1016/j.jconhyd.2025.104503

Afsana Khatoon , Shaziya Siddiqui , Nazrul Haq

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Abstract

The study emphasize on the synthesis of eco-friendly cellulose based magnetic nanocomposite derived from Lens cullnaris husk and Poly Vinyl Alcohol (Fe₃O₄@LENT/PVA) for the adsorption of Crystal Violet, Methylene Blue and Malachite Green Dye. The structural and functional morphology was determined by SEM-EDAX analysis and FTIR. The crystalline of Fe₃O₄@LENT/PVA was analyzed by XRD and pore size was determined by BET. The surface area of nanocellulose Fe₃O₄@LENT/PVA was found to be 22.308 m²/g and the pore volume of 0.074cm³/g. The Fe₃O₄@LENT/PVA nanocomposites show successful adsorption of CV, MB and MG in 120 min equilibrium time at pH 7 for CV and 8 for MB and MG respectively. The Fe₃O₄@LENT/PVA nanocomposites was best fitted Langmuir isotherm and follows pseudo 2nd order kinetics with intra particle as rate controlling mechanism. The nanocellulose Fe₃O₄@LENT/PVA composite shows good monolayer adsorption capacity in the order of CV(357 mg/g) > MB(112.35 mg/g) > MG(111.11 mg/g). Thermodynamic study reveals the process is endothermic and spontaneous in nature with ΔG⁰ value less than 20KJ mol⁻¹ at respective temperatures indicating Physiosorption. The nano-cellulose Fe₃O₄@LENT/PVA composite can be effectively desorb dyes by 0.1 M NaOH. The nanocellulose Fe₃O₄@LENT/PVA composite proves to be an effective adsorbent showing regeneration ability upto five times for all the dyes.

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从扁豆壳中分离阳离子染料的纤维素-聚乙烯醇磁性纳米复合材料：动力学、等温线和可重用性研究。

本研究重点研究了以龙眼果壳和聚乙烯醇（Fe3O4@LENT/PVA）为原料，制备了吸附结晶紫、亚甲基蓝和孔雀石绿染料的环保型纤维素基磁性纳米复合材料。通过SEM-EDAX和FTIR分析确定了结构和功能形态。用XRD分析了Fe3O4@LENT/PVA的结晶，用BET测定了其孔径。纳米纤维素Fe3O4@LENT/PVA的比表面积为22.308 m2/g，孔体积为0.074cm3/g。Fe3O4@LENT/PVA纳米复合材料在平衡时间120 min内成功吸附CV、MB和MG，平衡时间CV为7，MB和MG分别为8。Fe3O4@LENT/PVA纳米复合材料最符合Langmuir等温线，符合准二级动力学，颗粒内为速率控制机制。纳米纤维素Fe3O4@LENT/PVA复合材料表现出良好的单层吸附能力，吸附量为CV(357 mg/g) > MB(112.35 mg/g) > mg （111.11 mg/g）。热力学研究表明，该过程为吸热自发过程，在相应温度下ΔG0值均小于20KJ mol-1，为物理吸附过程。纳米纤维素Fe3O4@LENT/PVA复合材料可以在0.1 M NaOH的作用下有效解吸染料。纳米纤维素Fe3O4@LENT/PVA复合材料被证明是一种有效的吸附剂，对所有染料的再生能力高达5倍。

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来源期刊

Journal of contaminant hydrology 环境科学-地球科学综合

CiteScore

6.80

自引率

2.80%

发文量

129

审稿时长

68 days

期刊介绍： The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.