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The synthesis of an iron tailings-based geopolymer with synergistic electromagnetic wave consumption property

ENVIRONMENTAL RESEARCH 2025年 268卷 120744页

作者： Wang, Tianyu ning, xuwen Yang, Lang Rao, Feng Jiang, Kaixi Fuzhou Univ Sch Mat Sci & Engn Fuzhou 350108 Fujian Peoples R China Fuzhou Univ Zijin Sch Geol & Min Fuzhou 350108 Fujian Peoples R China Fuzhou Univ Fujian Key Lab Green Extract & High Value Utilizat Fuzhou 350108 Fujian Peoples R China

In this study, combination of wave absorption materials with different loss mechanisms are added into iron ore tailings-blast furnace slag (IOT-BFS) based geopolymers. The employed materials are hollow glass microsphere (HGM), carbon nanotubes (CNT) and carbonyl iron powder (CIP). Microstructures of the geopolymers are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and concrete porous structure analyzer. Conductivity and electromagnetic absorption property of the geopolymers are measured by a conductivity tester and a vector network analyzer (VNA). As increasing the content of wave absorption materials, compressive strength of the geopolymer decreased from 60.5 to 33.8 MPa. Compared with geopolymers containing HGM and CNT, wave absorption band below -5 dB of the geopolymers with HGM and CIP was wider, particularly at frequencies below 7 GHz, due to the synergism of space and magnetic loss. Its absorption bandwidth with the reflection loss less than -5 dB reaches 15.6 GHz. This study gives a clue for preparation of geopolymers with satisfactory electromagnetic wave absorption properties in the utilization as construction materials.

关键词： Geopolymers Electromagnetic wave absorption Iron ore tailings Microstructure

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A novel electromagnetic wave absorption geopolymer originated from iron tailings and blast furnace slag

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MATERIALS AND STRUCTURES 2025年第1期58卷 1-14页

作者： ning, xuwen Yang, Lang Rao, Feng Wang, Tianyu Wu, Shengping Huang, Hanhui Fuzhou Univ Zijin Sch Geol & Min Fuzhou 350108 Fujian Peoples R China Zhiyong Construct Grp Co Ltd Fuzhou 350800 Fujian Peoples R China Fuzhou Univ Fujian Key Lab Green Extract & High Value Utilizat Fuzhou 350108 Fujian Peoples R China State Key Lab Mineral Proc Beijing 102628 Peoples R China Fujian JiangXia Univ Sch Engn Fuzhou 350108 Fujian Peoples R China Zhongke Chengfa Fujian Construct Grp Co Ltd Nanping 354105 Fujian Peoples R China Coll Civil Engn Fujian ChuanZheng Commun Coll Fuzhou 350007 Fujian Peoples R China

In this work, a novel electromagnetic wave absorption geopolymer was created with efficient utilization of two solid wastes iron tailings and blast furnace slag, meanwhile the mechanism and impacts of iron tailings content, water-solid ratio and specimen thickness on their electromagnetic wave absorption and mechanical property were systematically investigated. It was found the pores, micro-cracks and unreacted particles in the specimens are benefitial for electromagnetic wave absorption but against to compressive strength, even though the compressive strength reaches 69.7 MPa with the iron tailings content 50% and water-solid ratio 0.4. The addition of iron tailings significantly enhances the electromagnetic wave absorption properties of the geopolymers, and increasing iron tailings content improves the number of pores, micro-cracks and the permeability of geopolymers. The electromagnetic wave absorption properties of the geopolymer initially increase and then decrease with the increase of specimen thickness and water-solid ratio. With an iron tailings content 70%, water-solid ratio 0.4 and thickness 30 mm, the effective absorption bandwidth (< -5 dB) was optimized to 10.44 GHz with a minimum reflection loss of -13.34 dB. A new mechanism for electromagnetic absorption in iron tailings has been proposed, in which the electromagnetic wave absorption of geopolymers is mainly dominated by magnetic loss and spatial propagation loss. This study provides higher competitiveness and comprehensive utilisation of iron tailings in the field of electromagnetic wave absorbing building materials, and has great potential for applications in military and other fields affected by high electromagnetic wave frequencies.

关键词： Iron tailings Geopolymers Microwave absorption Reflectivity

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Electromagnetic wave absorption properties of red mud-blast furnace slag based geopolymers filled with various wave-absorption materials

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CONSTRUCTION AND BUILDING MATERIALS 2023年 404卷

作者： Wang, Tianyu ning, xuwen Yang, Lang Rao, Feng Jiang, Kaixi Fuzhou Univ Sch Mat Sci & Engn Fuzhou 350108 Fujian Peoples R China Fuzhou Univ Zijin Sch Geol & Min Fuzhou 350108 Fujian Peoples R China Fuzhou Univ Fujian Key Lab Green Extract & High value Utilizat Fuzhou 350108 Fujian Peoples R China

In this work, red mud-blast furnace slag (RM-BFS) based geopolymers with excellent electromagnetic wave absorption property is synthesized through the incorporation of wave-absorption materials. The electromagnetic absorption property of geopolymer is characterized through the arched test, in which the reflection loss of specimens is tested by vector network analyzer (VNA). The microstructure and conductivity of geopolymers are characterized through scanning electron microscopy (SEM), concrete porous structure analyzer and conductivity tester. The crystalline phase and functional groups of geopolymers are characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Compared to Portland cement concrete (PCC), wave absorption band of the geopolymer is wider and the absorption peak in high frequency band is more intense. With the optimal addition of hollow glass microsphere (HGM), Fe2O3 and graphite particles, the absorption bandwidth with reflection loss less than -5 dB are 12.4, 7.7 and 8.1 GHz, and the maximum reflection loss are -9.4, -8.4 and -8.7 dB, respectively. This study might give a clue for preparation of geopolymers with high electromagnetic wave absorption properties.

关键词： Electromagnetic wave Compressive strength Microstructure Geopolymers Conductivity

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煤矸石的地质聚合反应资源化利用研究进展

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矿业研究与开发 2023年第12期43卷 206-213页

作者：方屹杨浪饶峰张凯铭宁旭文福州大学紫金地质与矿业学院福建福州350108 福建省新能源金属绿色提取与高值利用重点实验室福建福州350108

煤矸石是煤炭开采和洗选加工过程中产生的固体废弃物。煤矸石堆积不仅侵占大量土地面积,还造成水体、空气和土壤的污染,煤矸石的绿色规模化消纳迫在眉睫。针对煤矸石的物化性质、直接利用、提质利用和地质聚合反应利用进行了总结归纳,... 详细信息

煤矸石是煤炭开采和洗选加工过程中产生的固体废弃物。煤矸石堆积不仅侵占大量土地面积,还造成水体、空气和土壤的污染,煤矸石的绿色规模化消纳迫在眉睫。针对煤矸石的物化性质、直接利用、提质利用和地质聚合反应利用进行了总结归纳,并指出煤矸石的地质聚合反应利用是继普通硅酸盐水泥后的第二代绿色胶凝技术,兼具规模化消纳和高值化利用。系统介绍了地聚合物的制备原料、形成过程、反应特点和机理,以及在抗侵蚀材料、耐高温建材、固化重金属和放射性元素等主要场景中的应用。同时指出煤矸石的地质聚合反应资源化利用范围广,利用过程绿色且能耗低,但目前仍存在工业化试验少及规模化推广难等问题。旨在总结煤矸石资源化利用途径的最新研究,进一步为规模化绿色消纳煤矸石提供借鉴。

关键词：煤矸石地质聚合反应资源化利用绿色消纳

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铁尾矿在电磁吸波建筑材料中的研究进展

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硅酸盐通报 2023年第3期42卷 925-938页

作者：宁旭文杨浪饶峰孙传琳方屹张凯铭福州大学紫金地质与矿业学院福州350116 福建省新能源金属绿色提取与高值利用重点实验室福州350116

铁尾矿是我国大宗工业固废的主要组成部分,库存量大,若不加以处理,将会造成环境污染风险和二次资源浪费,如何高效资源化利用铁尾矿是安全消纳大宗工业固废的重要保障。本文基于铁尾矿的基本性质和利用途径,以及电磁吸波原理,主要介绍了... 详细信息

铁尾矿是我国大宗工业固废的主要组成部分,库存量大,若不加以处理,将会造成环境污染风险和二次资源浪费,如何高效资源化利用铁尾矿是安全消纳大宗工业固废的重要保障。本文基于铁尾矿的基本性质和利用途径,以及电磁吸波原理,主要介绍了铁尾矿及其改性电磁吸波材料研究,以及铁尾矿在水泥基吸波混凝土和地质聚合物吸波胶凝材料中的研究,着重阐述了铁尾矿在水泥基混凝土中的吸波性能和机理研究进展,探讨了通过地质聚合反应制备铁尾矿基地质聚合物吸波混凝土的可行性及其性能,可为铁尾矿基地质聚合物在多功能建筑材料方面的应用提供借鉴,为提高铁尾矿固废资源的综合利用率,解决尾矿堆积、环境污染等问题提供解决思路。本文旨在总结铁尾矿在吸波建筑材料的研究进展并进一步推动地质聚合物吸波建筑材料的发展。

关键词：铁尾矿电磁吸波混凝土综合利用地质聚合反应反射率

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地质聚合物多孔材料的制备及应用研究进展

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金属矿山 2022年第10期51卷 226-237页

作者：张凯铭杨浪饶峰方屹宁旭文刘文彪马航福州大学紫金地质与矿业学院福建福州350116 福建省新能源金属绿色提取与高值利用重点实验室福建福州350116 云南云天化股份有限公司研发中心云南昆明650228

地质聚合物多孔材料是一种具有三维结构的无定形多孔胶凝材料,因其优异的物理化学性能及绿色简便的制备方法被认为是未来最具发展潜力的胶凝材料之一。针对国内外地质聚合物多孔材料的最新研究,对地质聚合物多孔材料的制备方法,性能以... 详细信息

地质聚合物多孔材料是一种具有三维结构的无定形多孔胶凝材料,因其优异的物理化学性能及绿色简便的制备方法被认为是未来最具发展潜力的胶凝材料之一。针对国内外地质聚合物多孔材料的最新研究,对地质聚合物多孔材料的制备方法,性能以及相关应用进行了总结,着重阐述了溶剂挥发法、直接发泡法、添加多孔填料法等传统制备方法及其特点,同时还归纳了颗粒堆积法、3D打印法、模板法等新兴的制备方法;在相关的性能和应用研究方面,主要对其抗折压的机械性能,隔热保温的热学性能、对有机无机物的吸附和催化性能、膜分离、电磁波吸收等性能做了总结,指出了其在建筑领域、环境治理领域、电磁屏蔽领域的主要应用场景。论文论述了地质聚合物多孔材料发展现状和瓶颈,指明了当前地聚物多孔材料制备研究中存在成孔方法单一,成孔机理有待深入研究;在性能和应用研究中存在实验室固废试验与实际工业试验偏差大,规模化推广应用难。本文旨在总结最新地质聚合物多孔材料相关制备方法和应用研究,进一步推动地质聚合物多孔材料发展。

关键词：地质聚合物多孔材料制备方法

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Gas hydrate in-situ formation and dissociation in clayey-silt sediments: An investigation by low-field NMR

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ENERGY EXPLORATION & EXPLOITATION 2021年第1期39卷 256-272页

作者： Sun, Xiaoxiao Qin, xuwen Lu, Hongfeng Wang, Jingli Xu, Jianchun ning, Zijie China Geol Survey Guangzhou Marine Geol Survey Guangzhou Peoples R China China Geol Survey Gas Hydrate Engn Technol Ctr Guangzhou Peoples R China China Univ Geosci Beijing Sch Energy Resources Beijing Peoples R China China Univ Petr East China Sch Petr Engn Qingdao Peoples R China

The hydrate reservoir in the Shenhu Area of the South China Sea is a typical clayey-silt porous media with high clay mineral content and poor cementation, in which gas hydrate formation and dissociation characteristics are unclear. In this study, the CO2 hydrate saturation, growth rate, and permeability were studied in sandstone, artificial samples, and clayey-silt sediments using a custom-built measurement apparatus based on the low-field NMR technique. Results show that the T-2 spectra amplitudes decrease with the hydrate formation and increase with the dissociation process. For the artificial samples and Shenhu sediments, the CO2 hydrate occupies larger pores first and the homogeneity of the sandstone pores becomes poor. Meanwhile, compared with the clayey-silt sediments, CO2 hydrate is easier to form and with higher hydrate saturation for the sandstone and artificial samples. In hydrate dissociation process, there exists a protection mechanism, i.e. the dissociation near the center of hydrates grain is suppressed when gas pressure drops suddenly and quickly. For permeability of those samples, it decreased with hydrate forms, and increases with hydrate dissociation. Meanwhile, with the same hydrate saturation, permeability is higher in hydrate formation than in dissociation.

关键词： Gas hydrate clayey-silt sediments NMR formation and dissociation permeability

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Synthesis and bioactivity of thiazolidin-2-cyanamide derivatives against type III secretion system of Xanthomonas oryzae on rice

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PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2018年第Jul.期149卷 89-97页

作者： Xiang, xuwen Tao, Hui Jiang, Shan Zhang, Lian-Hui Cui, Zi-ning South China Agr Univ State Key Lab Conservat & Utilizat Subtrop Agrobi Integrat Microbiol Res Ctr Guangdong Prov Key Lab Microbial Signals & Dis Co Guangzhou 510642 Guangdong Peoples R China Guizhou Univ Minist Educ Key Lab Green Pesticide & Agr Bioengn Guiyang 550025 Guizhou Peoples R China

Targeting virulence factors of bacterial without affecting their growth and survival, has been an initiative strategy for the development of novel anti-microbial agents. The type III secretion system (T3SS), one of essential and highly conserved virulence factors in most Gram-negative pathogenic bacteria, has been regarded as an effective target that developed new anti-microbial drugs. Xanthomonas oryzae pv. oryzae (Xoo) is one of the most Important bacterial pathogens on rice, which causes leaf blight disease. To discover potential anti-virulence agents against the pathogens, a new series of thiazolidin-2-cyanamide derivatives containing 5-phenyl-2-furan were designed and synthesized. Their structures were characterized by H-1 NMR, C-13 NMR, MS, and elemental analysis. All the title compounds inhibited the promoter activity of a harpin gene hpa1, significantly, that were further checked for the impact on bacterial growth and on the hypersensitive response (HR) caused by Xoo on non-host tobacco plants. The results indicated that treatment of Xoo with the title compounds II-2,II-3 and II-4 resulted in significantly attenuated HR without affecting bacterial growth or survival. Moreover, quantitative reverse transcription-polymerase chain reaction (qRT-PCR) analysis showed that the expression of the Xoo T3SS was suppressed by treatment with the three inhibitors. The mRNA levels of representative genes in the hrp (hypersensitive response and pathogenicity) cluster, as well as the regulatory genes hrpG and hrpX, were reduced. Finally, the in vivo test demonstrated that the compounds could reduce the disease symptoms of Xoo on the rice cultivar (Oryza sativa) IR24.

关键词： Xanthomonas oryzae pv. oryzae (Xoo) Type III secretion system (T3SS) Small molecule inhibitors Virulence factors Thiazolidin-2-cyanamide Synthesis

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Synthesis and bioactivity of phenyl substituted furan and oxazole carboxylic acid derivatives as potential PDE4 inhibitors

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EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY 2020年 207卷 112795-112795页

作者： Lin, Yinuo Ahmed, Wasim He, Min Xiang, xuwen Tang, Riyuan Cui, Zi-ning South China Agr Univ Guangdong Prov Key Lab Microbial Signals & Dis Co Integrat Microbiol Res Ctr State Key Lab Conservat & Utilizat Subtrop Agrobi Guangzhou 510642 Peoples R China Guangdong Lab Lingnan Modern Agr Guangzhou 510642 Peoples R China South China Agr Univ Coll Mat & Energy Dept Appl Chem Guangzhou 510642 Peoples R China

In this present study, a series of 5-phenyl-2-furan and 4-phenyl-2-oxazole derivatives were designed and synthesized as phosphodiesterase type 4 (PDE4) inhibitors. In vitro results showed that the synthesized compounds exhibited considerable inhibitory activity against PDE4B and blockade of LPS-induced TNF-alpha release. Among the designed compounds, Compound 5j exhibited lower IC50 value (1.4 mu M) against PDE4 than parent rolipram (2.0 mu M) in in vitro enzyme assay, which also displayed good in vivo activity in animal models of asthma/COPD and sepsis induced by LPS. Docking results suggested that introduction of methoxy group at para-position of phenyl ring, demonstrated good interaction with metal binding pocket domain of PDE4B, which was helpful to enhance inhibitory activity. (C) 2020 Elsevier Masson SAS. All rights reserved.

关键词： 5-phenyl-2-furan 4-phenyl-2-oxazole 2-cyanoimino-1,3-thiazolidine Synthesis PDE4 inhibitors Molecular simulation

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MRI and histologic analysis of collagen type II sponge on repairing the cartilage defects of rabbit knee joints

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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS 2011年第2期96B卷 267-275页

作者： Chen, Honghui Yang, Xiaohong Liao, Yingyang Zeng, xuwen Liang, Peihong Kang, ning Tan, Jianrong Liang, Zhiping Jinan Univ Coll Med Affiliated Hosp 4 Guangzhou Inst Traumat Surg Guangzhou 510220 Guangdong Peoples R China Jinan Univ Coll Med Affiliated Hosp 4 Dept Radiol Guangzhou 510220 Guangdong Peoples R China

There are limited treatment options for cartilage defects in clinical practice because of the lack of suitable biomaterials. Here, we evaluated the effects of collagen type II sponge on the articular cartilage repairing process using a cartilage injury of a rabbit knee joint model. We showed that the home-made collagen type II sponges appeared to have a suitable pore size of 93.26 +/- 38.4 mu m for chondrocyte growth. MRI with H&E staining results demonstrated that the effusion absorption in the collagen type II sponge treated group was quicker than that of the control group. Moreover, sporadic cartilage signals first appeared at 6 weeks in the collagen type II sponge treated group. Safranin O staining and immunohistochemical analysis confirmed that the newly formed cartilage expresses glycosaminoglycan and type II collagen matrix. Using Sirius red polarized light staining, we showed that the newly formed cartilage-like areas from the collagen type II treated group are significantly greater than those of the control group. Taken together, our data demonstrated that the home-made collagen type II sponge is able to promote cartilage repair in the cartilage injury of a rabbit knee joint model. (C) 2010 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 96B: 267-275, 2011.

关键词： collagen type II magnetic resonance imaging histopathology cartilage defect repair Sirius red polarized light staining

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