High adsorption capacities of rhodamine B dye by activated carbon synthesized from cotton stalks agricultural waste by chemical activation

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-04-01 DOI:10.1016/j.ceramint.2025.01.178

A. Venkatesan , B. Srividhya , Abdalrahman Alajmi , Abdellatif M. Sadeq , Rama Krishna Chava , Mohamed A. Habila , D. Senthil Kumar , L. Guganathan , S. Ragupathy

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引用次数: 0

Abstract

The worldwide water issue had been made worse by water contamination. The development of sustainable techniques to reduce water pollution was urgently needed because dye effluents constituted a major hazard to both the environment and human health. This paper described a simple process for producing cotton stalk-activated carbon (CSAC) using H₃PO₄ activation and agricultural waste (cotton stalks). The CS impregnation ratios of 1:1 and 1:2 were prepared, and they were named CSAC1 and CSAC2, respectively. Using a range of analytical methods, the produced materials' physical-chemical characteristics were examined. The prepared CSAC2 had a BET specific surface area of 461 m²g⁻¹. Additionally, CSAC2 material was employed for the adsorption of Rhodamine B (RhB) dye from aqueous solutions. However, the parameters of time, pH, dose, and dye concentration on the removal efficiency of dye were assessed. The isotherm modeling of the adsorption data over the concentration range (20–100 mg/L) was performed using non-linear regression analysis. In addition, it was shown to have >99.5 % removal efficiency and the adsorption isotherms of dye were significantly described by the Langmuir model with maximum adsorption capacities of 144.36 mgg⁻¹ for RhB. The kinetic modeling revealed that the experimental data followed the pseudo-first order and pseudo-second order rate equations for CSAC2. The negative ΔG° and positive ΔH° values indicated spontaneous and endothermic adsorption process. The work's findings demonstrate that CSAC2, which can be produced quickly, is a great environmentally friendly adsorbent for removing dye from contaminated water.

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以农业废棉秸秆为原料化学活化合成的活性炭对罗丹明B染料具有较高的吸附性能

水污染使世界范围内的水问题变得更加严重。由于染料废水对环境和人类健康都构成重大危害，因此迫切需要发展可持续技术以减少水污染。介绍了以农业废弃物（棉花秸秆）为原料，利用H3PO4活化制备棉秆活性炭的简单工艺。制备了浸渍比为1:1和1:2的CS，分别命名为CSAC1和CSAC2。采用一系列的分析方法，检查了生产材料的物理化学特性。制备的CSAC2的BET比表面积为461 m2g−1。此外，CSAC2材料还用于吸附罗丹明B （RhB）染料。考察了时间、pH、剂量、染料浓度等参数对染料去除率的影响。采用非线性回归分析对吸附数据在浓度范围（20 ~ 100 mg/L）内的等温线建模。对染料的吸附等温线符合Langmuir模型，对RhB的最大吸附量为144.36 mg−1。动力学模拟表明，CSAC2的实验数据符合伪一阶和伪二阶速率方程。负ΔG°和正ΔH°表示自发吸附和吸热吸附过程。这项工作的发现表明，CSAC2可以快速生产，是一种很好的环保吸附剂，可以从污染的水中去除染料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.