Waste-to-resource strategy: MnOx - modified pine biochar for Cr(VI) ions removal from water

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-09-23 DOI:10.1016/j.mseb.2025.118808

Shilpi Agarwal, Shikha Wadhwa, Shailey Singhal, Ashmeet Bhogal

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引用次数: 0

Abstract

The study aims to address the mitigation of Cr(VI) contamination in water by the use of biochar-MnO_x composites. The biochar was prepared from pine needle waste, a significant contributor to forest fires in the hilly regions of India. The biochar was alkali-treated and modified with aqueous KMnO₄ solution to prepare APB-MnO_x composites. These composites were characterized using FTIR, XRD, XPS, FE-SEM, EDX, and BET surface area analysis, confirming successful incorporation of MnO_x within biochar microstructure. Batch adsorption studies revealed that among all composites, APB-M2 demonstrated the highest removal efficiency of 98.3 % for 100 ppm Cr(VI) at optimized conditions (pH 2, 0.3 g adsorbent dose, 90 min). Adsorption isotherm studies revealed that Cr(VI) adsorption on APB-M2 adhered to the Langmuir model (homogeneous adsorption mechanism) with a maximum adsorption capacity of ∼70 mg/g. The adsorption mechanism is discussed emphasizing the role of positively charged surface in adsorption process and the reduction of Cr(VI) to Cr(III) by MnO_x in APB-M2 adsorbent. This research holds significance in mitigating pine needle waste while providing an efficient adsorbent for Cr(VI) removal from water.

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废物资源化策略：MnOx改性松木炭去除水中的Cr（VI）离子

该研究旨在通过使用生物炭- mnox复合材料解决水中Cr（VI）污染的缓解问题。生物炭是由松针废料制备的，松针废料是印度丘陵地区森林火灾的重要原因。对生物炭进行碱处理，并用KMnO4水溶液进行改性，制备APB-MnOx复合材料。利用FTIR、XRD、XPS、FE-SEM、EDX和BET表面积分析对复合材料进行了表征，证实了MnOx在生物炭微观结构中的成功掺入。批量吸附研究表明，在最佳条件下（pH 2, 0.3 g吸附剂剂量，90 min）， APB-M2对100 ppm Cr（VI）的去除率最高，达到98.3%。吸附等温线研究表明，APB-M2对Cr（VI）的吸附符合Langmuir模型（均相吸附机制），最大吸附量为~ 70 mg/g。讨论了APB-M2吸附剂的吸附机理，重点讨论了带正电表面在吸附过程中的作用以及MnOx将Cr（VI）还原为Cr（III）的作用。本研究对减少松针废弃物的同时为水中Cr（VI）的去除提供了一种有效的吸附剂。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.