Optimizing solvothermal synthesis of aluminum-loaded pomelo peel for enhanced fluoride adsorption using response surface methodology

IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Industrial Crops and Products Pub Date : 2024-10-31 DOI:10.1016/j.indcrop.2024.119932
Junjie Gu, Ying Miao, Dezhen Zhu, Jiawen Li, Yuhuan Yang, Changqing Ye
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Abstract

Addressing fluoride contamination in water remains a critical challenge, particularly when seeking cost-effective solutions. In this study, we present a novel aluminum-loaded pomelo peel adsorbent (PPA-Al), synthesized via a one-step solvothermal method, with parameters optimized through response surface methodology. The ideal conditions were established at 2.96 g of pomelo peel, 2 g of NaAlO₂, a reaction temperature of 168.62 °C, and a duration of 140.78 minutes. Characterization of PPA-Al revealed an abundance of hydroxyl and carbon functional groups, enhancing its reactivity with coordination unsaturated aluminum sites. Adsorption isotherms conformed to both Langmuir and Freundlich models, achieving a maximum adsorption capacity of 88.81 mg·g⁻¹, outperforming many existing biomass-based adsorbents. Kinetic analysis indicated that fluoride adsorption followed a pseudo-second-order model, with thermodynamic evaluations suggesting that this process is a spontaneous endothermic reaction. Characterization techniques, including Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS), confirmed interactions between fluoride ions and -OH and -CH groups, as well as the formation of Al-F bonds. Notably, the use of PPA-Al reduces groundwater treatment costs by approximately 74.33∼83.24 % compared to activated alumina, and it can be reused multiple times without reagent regeneration. These findings highlight PPA-Al as a promising, efficient material for fluoride removal, while also demonstrating innovative applications for agricultural waste.
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利用响应面方法优化铝负载柚子皮的溶热合成,以增强对氟化物的吸附能力
解决水中的氟污染问题仍然是一项严峻的挑战,尤其是在寻求具有成本效益的解决方案时。在本研究中,我们介绍了一种新型铝负载柚子皮吸附剂(PPA-Al),该吸附剂是通过一步溶热法合成的,其参数通过响应面方法进行了优化。理想条件为:柚子皮 2.96 克、NaAlO₂ 2 克、反应温度 168.62 ℃、反应时间 140.78 分钟。对 PPA-Al 的表征表明,它含有大量羟基和碳官能团,这增强了它与配位不饱和铝位点的反应活性。吸附等温线符合 Langmuir 和 Freundlich 模型,最大吸附容量为 88.81 mg-g-¹,优于许多现有的生物质吸附剂。动力学分析表明,氟的吸附遵循伪二阶模型,热力学评估表明该过程是一种自发的内热反应。傅立叶变换红外光谱(FTIR)和 X 射线光电子能谱(XPS)等表征技术证实了氟离子与 -OH 和 -CH 基团之间的相互作用,以及 Al-F 键的形成。值得注意的是,与活性氧化铝相比,使用 PPA-Al 可降低地下水处理成本约 74.33%∼83.24%,而且无需试剂再生即可多次重复使用。这些研究结果表明,PPA-Al 是一种前景广阔的高效除氟材料,同时也展示了其在农业废弃物方面的创新应用。
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来源期刊
Industrial Crops and Products
Industrial Crops and Products 农林科学-农业工程
CiteScore
9.50
自引率
8.50%
发文量
1518
审稿时长
43 days
期刊介绍: Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.
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