Bio-adsorbents based on mesoporous silica produced from rice husks with tunable architecture and surface area for remediation of industrial effluents

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Porous Materials Pub Date : 2024-08-13 DOI:10.1007/s10934-024-01673-x

Cezar Augusto Moreira, Carlos Eduardo Scanferla, Angélica Gonçalves Oliveira, Vitor Anthony Duarte, Pedro Augusto Arroyo, Jéssica de Lara Andrade, Paulo Rodrigo Stival Bittencourt, Juliana Carla Garcia, Daniela Martins Fernandes de Oliveira

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Abstract

The search for efficient and more sustainable treatments of wastewater has become increasingly challenging in recent years. Aiming to contribute with this demand, the current study focused on the synthesis of mesoporous silica (MS) bio-adsorbents (MS1, MS2, MS3 and MS4) based on Santa Barbara Amorphous-15 (SBA-15) by a relatively simple and sustainable process using sodium silicate (SS) extracted from rice husk ashes (RHA) and Pluronic P123. Subtle and careful changes in the synthesis conditions resulted in MS samples with ordered pores and high specific surface area (S_BET), that is, 712 m² g⁻¹ (MS1), 838 m² g⁻¹ (MS2), 905 m² g⁻¹ (MS3) and 806 m² g⁻¹ (MS4), which are higher than other silicas also produced from RHA, indicating that our bio-adsorbents may exhibit superior pollutant adsorption capabilities. In that regard, various research reports the potential of MS to adsorb dyes, heavy metals, bacteria, pharmaceuticals and other pollutants in model systems. However, our proposal advanced in testing the adsorbent potential of these materials for two independent systems: (i) removal of methylene blue (MB) model dye from aqueous solutions and (ii) treatment of an industrial denim laundry effluent. Indeed, all MS bio-adsorbents were potentially efficient and reusable, but MS1 and MS2 exhibited higher adsorption capacities for MB dye (q_e = 327.29 and 365.78 mg g⁻¹, respectively) at pH 12.0. The investigation of the effect of ions and DFT calculations contributed to elucidating the interactions between MB dye and MS bio-adsorbents. In addition, our bio-adsorbents stand out by their excellent efficiency (~ 75%) in the remediation of an industrial effluent exclusively by adsorption. Among the produced bio-adsorbents, MS2 has shown a higher degree of mesoscopic order, well-ordered and open-ended pores with oval architecture and interconnected hollow channels, but both MS1 and MS2 displayed similar adsorption capacities normalized by total surface area, demonstrating to be promising and eco-friendly adsorbents for use in environmental remediation.

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基于稻壳生产的介孔二氧化硅的生物吸附剂，其结构和表面积可调，可用于工业废水的修复

近年来，寻求高效、更可持续的废水处理方法变得越来越具有挑战性。为了满足这一需求，目前的研究重点是利用从稻壳灰（RHA）中提取的硅酸钠（SS）和 Pluronic P123，通过相对简单和可持续的工艺合成基于圣巴巴拉无定形-15（SBA-15）的介孔二氧化硅（MS）生物吸附剂（MS1、MS2、MS3 和 MS4）。通过对合成条件进行细微而谨慎的改变，得到了具有有序孔隙和高比表面积（SBET）的 MS 样品，即 712 m2 g-1 (MS1)、838 m2 g-1 (MS2)、905 m2 g-1 (MS3) 和 806 m2 g-1 (MS4)，高于其他同样由 RHA 制成的白炭黑，这表明我们的生物吸附剂可能具有卓越的污染物吸附能力。在这方面，各种研究报告都指出了 MS 在模型系统中吸附染料、重金属、细菌、药物和其他污染物的潜力。不过，我们的建议是在两个独立的系统中测试这些材料的吸附潜力：(i) 从水溶液中去除亚甲基蓝（MB）模型染料；(ii) 处理工业牛仔布洗衣废水。事实上，所有 MS 生物吸附剂都具有潜在的高效性和可再利用性，但在 pH 值为 12.0 时，MS1 和 MS2 对甲基溴染料表现出更高的吸附能力（qe = 327.29 和 365.78 mg g-1）。离子效应研究和 DFT 计算有助于阐明甲基溴染料与 MS 生物吸附剂之间的相互作用。此外，我们的生物吸附剂在完全通过吸附作用修复工业废水方面具有出色的效率（约 75%）。在所制备的生物吸附剂中，MS2 显示出更高的中观有序度、有序的开口孔隙、椭圆形结构和相互连接的中空通道，但按总表面积归一化计算，MS1 和 MS2 显示出相似的吸附能力，表明它们是有希望用于环境修复的环保型吸附剂。

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

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.