JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Jun Liang,Xiaoyun Xu,Qijun Zhong,Zibo Xu,Ling Zhao,Hao Qiu,Xinde Cao
Biochar as an environmental-friendly and low-cost catalyst has gained increasing attention in the catalytic degradation of organic pollutants. However, the roles of endogenous mineral constituents in biochar in the catalytic degradation are still unclear. In this study, the mineral-rich biochar produced from sewage sludge at 400 °C (SS400) and 700 °C (SS700) and their corresponding demineralized biochar (DSS400 and DSS700) were used to be the persulfate (PS) activator for phenol degradation. Results showed that the mineral-rich biochar + PS system had negligible phenol degradation (≤12.6 %), whereas distinct degradation of phenol were obtained in the demineralized biochar + PS system where DSS400 + PS and DSS700 + PS exhibited 36.3 % and 57.8 % degradation, respectively. Different minerals in mineral-rich biochar exhibited varying functions on phenol degradation. Mg and K in biochar had less effect on the phenol degradation, while Fe-containing minerals favored the phenol degradation. However, Ca-containing minerals more greatly reduced the formation of hydroxyl radical, resulting in more inhibited degradation of phenol. Thus, the overall degradation of phenol was reduced by the mineral-rich biochar. The findings indicated that the inherent minerals in biochar were not favorable for the phenol degradation, which guides us the application of biochar containing different minerals in the remediation of organic pollutants.
研究领域:
环境科学
·
污染治理
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DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 9
·1705-1715
·
IF 4.8
Zhou Guotao,Wang Yilin,Qi Tiangui,Zhou Qiusheng,Liu Guihua,Peng Zhihong,Li Xiaobin
Goethitic bauxite is a widely used raw material in the alumina industry. It is an essential prerequisite to clarify the effect of Ti- and Si-containing minerals on goethite transformation in the Bayer digestion process, which could efficiently utilize the Fe- and Al-containing minerals present in goethitic bauxite. In this work, the interactions between anatase or kaolinite with goethite during various Bayer digestion processes were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The results showed that anatase and kaolinite hindered the transformation of goethite. Anatase exerted more significant effects than kaolinite due to the dense sodium titanate layer on the goethite surface after reacting with the sodium aluminate solution. Adding the reductant hydrazine hydrate could eliminate the retarding effect by inducing the transformation of goethite into magnetite. In this process, titanium was embedded into the magnetite lattice to form Ti-containing magnetite. Furthermore, the weakening of the interaction between magnetite and sodium aluminosilicate hydrate reduced the influence of kaolinite. As a validation of the above results, the reductive Bayer method resulted in the transformation of goethite into goethitic bauxite with 98.87% relative alumina digestion rate. The obtained red mud with 72.99wt% Fe 2 O 3 could be further utilized in the steel industry. This work provides a clear understanding of the transformative effects of Ti- and Si-containing minerals on iron mineral transformation and aids the comprehensive use of iron and aluminum in goethitic bauxite subjected to the reductive Bayer method.
研究领域:
矿物学
·
冶金工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Yu Lu,Yilian Li,Danqing Liu,Yu Ning,Sen Yang,Zhe Yang
Benzene, as the representative compound in volatile organic chemicals (VOCs), widely exists in contaminated sites. Adsorption performance of clay minerals can retard the transport of VOCs gas phase to some extent. Static adsorption experiments were conducted to investigate the adsorption capacity of benzene vapor on natural silicate clay minerals (smectite, illite, chlorite and kaolinite) under different temperatures, moisture contents and mineral mixtures. The results of adsorption isotherms for oven-dried clay minerals implied that the distinct adsorption capacity for benzene was mainly attributed to the specific surface areas and pore volume of clay minerals. The amount of adsorption benzene reduced to the minimum, and then gradually increased as the moisture content raised. The existences of water molecule competed the adsorption sites with benzene on the surface of clay minerals at the low moisture content, whereas the dissolutions of benzene molecule in the adsorbed water and the gravitational water could facilitate the adsorption process of clay minerals its adsorption with a saturated water content . Except for the mixture of smectite-kaolinite samples which showed obstruction of pores and declined the adsorption amount of benzene vapor, the experimentally observed adsorption values of benzene on binary mineral mixtures were equal to the theoretically linear sum of the contributions of each individual minerals.
研究领域:
环境科学
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土壤学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2013
·
IF 3.554
Yue Wu,Ying Jiang,Jiaguo Jiao,Manqiang Liu,Feng Hu,Bryan S. Griffiths,Huixin Li
Laccases play an important role in the degradation of soil phenol or phenol-like substance and can be potentially used in soil remediation through immobilization. Iron and aluminum minerals can adsorb extracellular enzymes in soil environment. In the present study, we investigated the adsorptive interaction of laccase, from the white-rot fungus Trametes versicolor , with soil iron and aluminum minerals and characterized the properties of the enzyme after adsorption to minerals. Results showed that both soil iron and aluminum minerals adsorbed great amount of laccase, independent of the mineral specific surface areas. Adsorbed laccases retained 26–64% of the activity of the free enzyme. Compared to the free laccase, all adsorbed laccases showed higher K m values and lower V max values, indicating a reduced enzyme-substrate affinity and a lower rate of substrate conversion in reactions catalyzed by the adsorbed laccase. Adsorbed laccases exhibited increased catalytic activities compared to the free laccase at low pH, implying the suitable application of iron and aluminum mineral-adsorbed T. versicolor laccase in soil bioremediation, especially in acid soils. In terms of the thermal profiles, adsorbed laccases showed decreased thermal stability and higher temperature sensitivity relative to the free laccase. Moreover, adsorption improved the resistance of laccase to proteolysis and extended the lifespan of laccase. Our results implied that adsorbed T. versicolor laccase on soil iron and aluminum minerals had promising potential in soil remediation.
研究领域:
环境生物学
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土壤科学
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产品关联
DOI
PubMed
高影响因子
Minerals
·
2023
·Vol. 13
·期 3
·387
·
IF 2.5
Min Zhang,Fangfang Chen,Guoying Yan,Hongjing Li,Jing Li,Guan Peng,Hongdong Yu
The characteristics of Baiyun Obo niobium-bearing minerals are complex physicochemical properties that make the beneficiation of niobium minerals extremely difficult. In this paper, X-ray diffraction, X-ray fluorescence and mineral liberation analyzer (MLA) systems were used to study the niobium occurrence state and distribution of niobium-bearing minerals in the samples from Baiyun Obo. The results show that the chemical and mineral compositions of the sample are complex, with a Nb2O5grading of 0.24%. There are many kinds of niobium minerals, including ilmenorutile, nioboaeschynite-Nd, baotite, latrappite, euxenite-Y, fergusonite and columbite-Mn, and the highest mass fraction of 0.55% is achieved with Nb in nioboaeschynite-Nd, followed by the mass fraction of ilmenorutile (0.33%). All of the niobium-containing minerals demonstrate a low degree of dissociation. Flotation experiments explored the optimal flotation conditions for HOBA (1-hydroxyoctyl-1,1-bisphosphonic acid) as a flotation collector for Baiyun Obo niobium minerals, which is able to increase the grade of Nb2O5in the concentrate to 1.31%. The optimal use conditions of the reagent are pH 3.5–4.5, and the amount of the collector is 1000 g/t. By further optimizing the beneficiation process and reagent system, ilmenorutile and nioboaeschynite-Nd were significantly enriched in the concentrate, which suggested that HOBA can efficiently increase the grade of Nb2O5in the concentrate.Keywords:MLA;distribution regularity;flotation;niobium;Baiyun Obo
研究领域:
矿物加工
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地球化学
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材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 45
·68680-68691
·
IF 5.19
Guo Lin-yu,He Xian,Hong Zhi-neng,Xu Ren-Kou
Lead (Pb) is one of the top metal pollutants worldwide, and its distribution between liquid and solid phases of soils is strongly controlled by its adsorption on minerals, organic matter, and their composites. This paper presented the effect of fulvic acid (FA) coexistence on the distribution of Pb(II) at the solid–liquid interface of four minerals, which provided reference for how to use humic substances to remove toxic Pb(II) in soils. The free Pb 2+ of suspensions, measured by Pb ion selective electrode, was used to characterize the complexation of FA with Pb 2+ at various pH. The adsorption isotherms of Pb(II) by montmorillonite, kaolinite, goethite, and gibbsite with and without FA were studied with batch experiments. Results indicated that the free Pb 2+ decreased and complexed Pb(II) increased with the increase of FA concentration in Pb(II)-FA solutions, whether the initial concentration of Pb(II) was 0.1 or 1 mM. Pb 2+ hydrolysis was low and the free Pb 2+ concentration in pure lead solution without FA was generally unchanged with increasing solution pH at pH < 6.0. But free Pb 2+ decreased with the increase of pH in the presence of FA, suggesting that the complexation ability of FA with Pb 2+ increased with the increase of solution pH. The adsorption of Pb(II) by the minerals without FA followed the order: montmorillonite > kaolinite ≈ goethite > gibbsite at pH5.0. The Pb(II) adsorption by montmorillonite and kaolinite significantly enhanced with 1 g/L FA, while significantly inhibited with 3 g/L FA at low initial Pb(II) concentration. However, the effect of FA on Pb(II) adsorption by montmorillonite was greater than that of kaolinite, which was mainly related to the crystal layer structure, adsorption area, and cation exchange capacity of the minerals. The Pb(II) adsorption by goethite and gibbsite was significantly enhanced by the addition of both 1 g/L and 3 g/L FA, and the enhancement was more evident in goethite system. The effect of FA on the distribution of Pb(II) between solid and liquid phases of the minerals was determined by the factors such as the initial concentration ratio of FA to Pb(II), the adsorption capacity of minerals for FA, and the number of soluble complexes of FA with Pb 2+ . Therefore, the distribution of FA between solid and liquid of four minerals affected the distribution of Pb(II) between solid and liquid phases of the minerals greatly. The results can provide an important reference for understanding the distribution of Pb(II) and the dynamics and mobility of active components in polluted soils.
研究领域:
环境科学
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土壤学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhihui Chen,Jun Yao,Tatjana Šolević Knudsen,Bo Ma,Bang Liu,Hao Li,Xiaozhe Zhu,Chenchen Zhao,Wancheng Pang,Ying Cao
The environmental impact of the mining industry requires efficient and eco-friendly technologies to mitigate the presence of mineral flotation reagents (MFRs) in mineral processing wastewater (MPW) prior to their discharge into the environment. In this work, for the first time, a robust, easily separable and reusable biocatalyst, Fe 3 O 4 @SiO 2 -NH 2 -Lac, was used for the degradation of a novel mineral flotation reagent 8-hydroxyquinoline (8-HQ). Under optimized conditions, Fe 3 O 4 @SiO 2 -NH 2 -Lac achieved 89.2% 8-HQ degradation efficiency within 6 h. The effect of the main constituents of MPW on 8-HQ degradation, including metal ions, organic solvents, surfactant, metal chelator and flotation frother was evaluated. The Fe 3 O 4 @SiO 2 -NH 2 -Lac also displayed favorable degradation efficiency of 8-HQ in real lead–zinc mine water. The biocatalyst could be easily recovered and had a satisfactory reusability, retaining 64.5% of 8-HQ degradation efficiency in the sixth reaction cycle. Identification of intermediate products revealed that Fe 3 O 4 @SiO 2 -NH 2 -Lac mediated reaction predominantly generated various structural 8-HQ oligomers/polymers. A potential degradation pathway for 8-HQ was speculated as follows: Fe 3 O 4 @SiO 2 -NH 2 -Lac initially catalyzed the oxidation of 8-HQ to yield the corresponding reactive radical intermediates, which subsequently undergone self-coupling reaction via C − C and C − O − C covalent coupling at their ortho and/or para positions, finally forming oligomers and polymers. The inhibition assays of marine bacterium ( Vibrio fischeri ) demonstrated that the toxicity of 8-HQ and its intermediate products was effectively reduced after Fe 3 O 4 @SiO 2 -NH 2 -Lac treatment. The results of this study might present an alternative immobilized laccase-based clean biotechnology for the clean-up and detoxification of 8-HQ contaminated MPW.
研究领域:
环境科学
·
生物技术
·
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nutrients
·
2022
·Vol. 14
·期 3
·618
·
IF 6.706
Zhi Huang,Xing Liu,Ziming Li,Luwei Cui,Candi Liu,Weifeng Wang,Yuming Hu,Bo Chen
Background. Minerals play important biological roles in lipid metabolism. The primary aim of this study was to examine the relationships between erythrocyte fatty acids (FAs) levels with whole blood mineral elements concentrations among Chinese children. Methods. A cross-sectional study was conducted. A total of 435 children aged 4–7 years were recruited. Whole blood mineral elements were determined by atomic absorption spectrometry and erythrocyte FAs composition by gas chromatography-mass spectrometer. Results. There were direct correlations between Zn and C18:2n-6 (FDR correctedp= 0.019), total n-6 PUFAs (FDR correctedp= 0.034), and total PUFAs (FDR correctedp= 0.034). Direct correlations were found between whole blood Zn and C18:1n-9 (FDR correctedp= 0.035), C24:1n-9 (FDR correctedp= 0.023), total MUFAs (FDR correctedp= 0.023), and C18:2n-6 (FDR correctedp= 0.048) in the Cu < P50 group. In the Cu ≥ P50 group, Mg was inversely related to most FAs (All FDR correctedp< 0.05). In the Zn < P50 group, Cu was directly related to C24:1n-9, total MUFAs, C20:5n-3, C22:6n-3, total n-3 PUFAs, C20:4n-6, total n-6 PUFAs, total PUFAs, and total FAs (All FDR correctedp< 0.05). Conclusions. Whole blood Cu and Zn levels were directly linked to several FAs levels in the erythrocytes of children. The interactions of Mg, Cu, and Zn with fatty acids may affect FA metabolism, in which Mg influences FA absorption.Keywords:erythrocyte;mineral elements;fatty acids;children
研究领域:
营养学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 3
·032506
·
IF 3.3
Wenqiang Li,Aimin Liu,Yanying Jiang,Chengdan He,Fengguo Liu,Yongjun Wang,Xianwei Hu,Jin Wang,Zhongning Shi
Silicate minerals on S-type asteroids are a potential resource for in situ production of silicon. We investigated the feasibility of synthesizing silicon from Mg2Si3O8 through electrolysis in NaF-LiF molten salt. Solubility of Mg2Si3O8 in NaF-LiF molten salt was determined using isothermal saturation. Dissolution equilibrium is reached after 120 min, and the solubility of Mg2Si3O8 in NaF-LiF molten salt at 750 °C is 28.9%. Electrochemical studies revealed that the reduction of Si(IV) in NaF-LiF molten salt is a two-step process. Si(IV) was reduced to Si(II) at −1.1 V (vs Pt), and Si(II) was further reduced to metallic silicon at −1.2 V (vs Pt). Electrolysis of Mg2Si3O8 in NaF-LiF molten salt was conducted at 750 °C using a high-purity graphite sheet as anode and a silver sheet as cathode. Electrolysis products were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). XRD indicated that the main phase of the electrolysis products was silicon when cell voltages were 2.0, 2.5, 3.0, and 3.5 V. Raman spectroscopy confirmed the presence of crystal silicon. SEM and EDS revealed that the electrolysis products exhibit granular morphology, and silicon concentration reached a maximum value of 98.14% when the cell voltage was 2.5 V.
研究领域:
材料科学
·
天体资源开发
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Jun Zhang,Ziqi Zhu,Mengyuan Niu,Menghan Yu,Xiongbo Dong,Huaming Yang
Soil minerals influence the biogeochemical cycles of fluoride (F) and phosphorus (P), impacting soil quality and bioavailability to plants. However, the cooperative mechanisms of soil minerals in governing F and P in the soil environment remain a grand challenge. Here, we reveal the essential role of a typical soil mineral, montmorillonite (Mt), in the cycling and fate of F and P. The results show that the enrichment of metal sites on the Mt surface promotes the mineralization of F to the fluorapatite (FAP) phase, thereby remaining stable in the environment, simultaneously promoting P release. This differential behavior leads to a reduction in the level of F pollution and an enhancement of P availability. Moreover, solid-state NMR and HRTEM observations confirm the existence of metastable F–Ca–F intermediates, emphasizing the pivotal role of Mt surface sites in regulating crystallization pathways and crystal growth of FAP. Furthermore, the in situ atomic force microscopy and theoretical calculations reveal molecular fractionation mechanisms and adsorption processes. It is observed that a competitive relationship exists between F and P at the Mt interface, highlighting the thermodynamically advantageous pathway of forming metastable intermediates, thereby governing the activity of F and P in the soil environment at a molecular level. This work paves the way to reveal the important role of clay minerals as a mineralization matrix for soil quality management and offers new strategies for modulating F and P dynamics in soil ecosystems.
研究领域:
土壤科学
·
环境科学
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地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PNAS Nexus
·
2023
·Vol. 2
·期 11
·
IF 0
Ge Qiuyue,Liu Yangyang,You Wenbo,Wang Wei,Li Kejian,Ruan Xuejun,Xie Lifang,Wang Tao,Zhang Liwu
The origin of life on Earth is an enigmatic and intricate conundrum that has yet to be comprehensively resolved despite recent significant developments within the discipline of archaeology and geology. Chemically, metal-sulfide minerals are speculated to serve as an important medium for giving birth in early life, while yet so far direct evidence to support the hypothesis for the highly efficient conversion of inorganic carbon into praxiological biomolecules remains scarce. In this work, we provide an initial indication that sphalerite, employed as a typical mineral, shows its enormous capability for promoting the conversion of inorganic carbon into elementary biomolecule formic acid (HCOOH) in airborne mineral-bearing aerosol microdroplet, which is over two orders of magnitude higher than that of the corresponding conventional bulk-like aqueous phase medium in the environment (e.g. river, lake, sea, etc.). This significant enhancement was further validated by a wide range of minerals and clays, including CuS, NiS, CoS, CdS, MnS, elemental sulfur, Arizona Test Dust, loess, nontronite, and montmorillonite. We reveal that the abundant interface of unique physical–chemical features instinct for aerosol or cloud microdroplets reduces the reaction energy barrier for the reaction, thus leading to extremely high HCOOH production (2.52 × 1014 kg year−1). This study unfolds unrecognized remarkable contributions of the considered scheme in the accumulation of prebiotic biomolecules in the ancient period of the Earth.
研究领域:
化学
·
生物学
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地球科学
✓ 已验证
DOI
PubMed
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Guanjun Wen,Kuibao Zhang,Haibin Zhang,Yuancheng Teng,Ye Zhou
Synroc is recognized as the second generation waste form for safety disposal of high-level radioactive waste (HLW). In this study, the Synroc mineral of rutile was employed as host phase for the immobilization of Nd 2 O 3 and CeO 2 , which were selected as surrogates of trivalent and tetravalent actinide nuclides. Rutile waste forms with different Nd 2 O 3 and CeO 2 incorporations were prepared under normal pressure sintering. Nd 2 Ti 2 O 7 pyrochlore was produced as the target phase in 1100 °C calcined Nd-bearing TiO 2 . Lattice stabilization of CeO 2 in rutile TiO 2 could not be accomplished even under 1500 °C sintering. The 28 day normalized leaching rates ( LR i ) of Ti and Nd in Nd-bearing rutile, which decline congruously as the Nd 2 O 3 content increases, are lower than 3×10 −5 g m −2 d −1 . The incorporation of CeO 2 significantly impairs the aqueous durability of rutile waste form.
研究领域:
核废料管理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）