Recycling of Mn oxide-loaded AMD sludge composite for the removal of As(V) and Sb(V) from wastewater: Adsorption performance and mechanisms

IF 6.7 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation Pub Date : 2024-09-05 DOI:10.1016/j.eti.2024.103820

Jiajun Zou , Ruixue Zhang , Yuran Fu , Pan Wu , Yonglin Chen , Li An , Hong Yang , Min Yu

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引用次数: 0

Abstract

The remediation of arsenic (As) and antimony (Sb) contaminated water is now a global research priority. The concept of "treating waste with waste" by modifying and recycling acid mine drainage sludge (AMDs) for treating As and Sb-contaminated wastewater is widely supported by scholars worldwide. In this study, a novel composite material (MnOx@AMDs) was synthesized via co-precipitating Mn oxides with AMDs. Characterization and adsorption results indicated that, after optimal Mn oxide loading (Mn²⁺: MnO₄^- = 0.075: 0.05 (mol)), MnOx@AMDs-1 exhibited a significant increase in specific surface area and surface positive potential, as well as the formation of abundant mesoporous structures and functional hydroxyl groups. The adsorption of As(V) and Sb(V) onto MnOx@AMDs-1 was best described by the Pseudo-second-order (R² = 0.96 and 0.95) kinetics and Langmuir (R² = 0.99 and 0.96) models, indicating a monolayer homogeneous chemisorption process. The maximal theoretical adsorption capacities at 25°C were 49.31 mg g⁻¹ for As(V) and 155.12 mg g⁻¹ for Sb(V). Post-adsorption characterization revealed that the predominant adsorption mechanisms include complexation, electrostatic attraction, and hydrogen bonding. Furthermore, MnOx@AMDs-1 sustained a removal efficiency exceeding 75 % for As(V) and Sb(V) over five consecutive adsorption-desorption cycles, while the maximum concentration of dissolved Mn (1.87 mg L⁻¹) remained under the 2 mg L⁻¹ threshold set by GB 18918–2002 standards. In conclusion, MnOx@AMDs-1, as a novel adsorbent with high efficiency and environmental friendliness, demonstrates significant potential for application in treating As(V) and Sb(V) contaminated wastewater.

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循环利用氧化锰负载的 AMD 污泥复合材料去除废水中的砷(V)和锑(V)：吸附性能与机理

砷（As）和锑（Sb）污染水的修复是目前全球研究的重点。通过改良和回收利用酸性矿山排水污泥（AMDs）来处理砷和锑污染废水的 "以废治废 "理念得到了全球学者的广泛支持。本研究通过氧化锰与 AMDs 的共沉淀合成了一种新型复合材料（MnOx@AMDs）。表征和吸附结果表明，在最佳氧化锰负载量（Mn2+：MnOx@AMDs-1的比表面积和表面正电位显著增加，并形成了丰富的介孔结构和功能性羟基。MnOx@AMDs-1对As(V)和Sb(V)的吸附用伪二阶（R² = 0.96 和 0.95）动力学模型和Langmuir（R² = 0.99 和 0.96）模型进行了最佳描述，表明这是一个单层均相化学吸附过程。在 25°C 时，As(V) 的最大理论吸附容量为 49.31 mg g-1，Sb(V) 为 155.12 mg g-1。吸附后的表征显示，主要的吸附机制包括络合、静电吸引和氢键。此外，在连续五个吸附-解吸循环中，MnOx@AMDs-1 对 As(V) 和 Sb(V) 的去除率超过 75%，而溶解锰的最大浓度（1.87 mg L-1）仍低于 GB 18918-2002 标准规定的 2 mg L-1 临界值。总之，MnOx@AMDs-1 作为一种高效环保的新型吸附剂，在处理 As(V) 和 Sb(V) 污染废水方面具有巨大的应用潜力。

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

Environmental Technology & Innovation Environmental Science-General Environmental Science

CiteScore

14.00

自引率

4.20%

发文量

435

审稿时长

74 days

期刊介绍： Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas. As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.