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用于增强力学性能和有效去除染料的辣木籽粉改性矿渣地质聚合物的开发。

Development of moringa seed powder-modified slag geopolymers for enhanced mechanical properties and effective dye removal.

作者信息

Hashish Soher A, Kishar Essam A, Ahmed Doaa A, Ragei Sheren M, Ebrahim Aya Allah M

机构信息

Chemistry Department, Faculty of Women for Arts, Science and Education, Ain Shams University, Cairo, 11757, Egypt.

出版信息

Sci Rep. 2025 Mar 15;15(1):9017. doi: 10.1038/s41598-025-91091-z.

DOI:10.1038/s41598-025-91091-z
PMID:40089480
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11910593/
Abstract

Crystal violet (CV), a widely used dye in paints and textiles, poses a significant environmental threat due to its non-biodegradable nature. A modified slag-based geopolymer has been developed to address this issue by incorporating raw moringa seed powder (MSP), an agricultural waste. The geopolymers (SM1, SM2, and SM3) were created by adding different percentages of MSP (0.2%, 0.6%, and 1% by weight) to ground granulated blast furnace slag (GGBFS), using sodium silicate and 10 M sodium hydroxide as alkali activators. This combination enhances the geopolymer's mechanical and adsorbent properties, making it more effective for CV removal. The geopolymer composites were analyzed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Their mechanical properties were evaluated by conducting compressive strength and total porosity tests. Pore structure analysis was performed using nitrogen adsorption and desorption techniques, and the point of zero charges was determined. Additionally, batch experiments were carried out to investigate the adsorption of CV dye, employing two isotherm models and kinetic models for analysis. The SM1 mix, which is a modified slag-based geopolymer containing 0.2% MSP, exhibited the highest compressive strength at 73 MPa after 180 days, representing a 25.8% improvement compared to the control mix (100% slag). Furthermore, modified geopolymer mixes showed greater adsorption activity toward crystal violet compared to the control mix, with the SM3 mix achieving an adsorption capacity of up to 322.58 mg/g. The study demonstrates that adding MSP to slag-based geopolymer enhances mechanical strength and adsorption capacity. This indicates a positive impact on the composite's surface properties and highlights the environmental benefits of utilizing industrial and agricultural waste in wastewater treatment.

摘要

结晶紫（CV）是一种广泛应用于涂料和纺织品的染料，因其不可生物降解的特性而对环境构成重大威胁。为了解决这个问题，人们开发了一种改性的矿渣基地质聚合物，通过加入农业废弃物——辣木籽生粉（MSP）来实现。通过向磨细粒化高炉矿渣（GGBFS）中添加不同百分比（重量分别为0.2%、0.6%和1%）的MSP，并使用硅酸钠和10M氢氧化钠作为碱激发剂，制备了地质聚合物（SM1、SM2和SM3）。这种组合增强了地质聚合物的机械性能和吸附性能，使其对CV的去除更有效。使用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）对地质聚合物复合材料进行了分析。通过进行抗压强度和总孔隙率测试来评估其机械性能。使用氮气吸附和解吸技术进行孔隙结构分析，并确定零电荷点。此外，还进行了批量实验来研究CV染料的吸附情况，采用两种等温线模型和动力学模型进行分析。含有0.2% MSP的改性矿渣基地质聚合物SM1混合物在180天后表现出最高抗压强度，为73MPa，与对照混合物（100%矿渣）相比提高了25.8%。此外，与对照混合物相比，改性地质聚合物混合物对结晶紫表现出更大的吸附活性，SM3混合物的吸附容量高达322.58mg/g。该研究表明，向矿渣基地质聚合物中添加MSP可提高机械强度和吸附容量。这表明对复合材料的表面性能有积极影响，并突出了在废水处理中利用工农业废弃物的环境效益。

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