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Insights into the floatability between spodumene and albite from crystal chemistry standpoint

International Journal of Mining Science and technology 2022年第6期32卷 1329-1339页

作者： Hepeng Zhou Fanxin Xie Yongbing Zhang Boyuan Zhang Siqi Yang Xianping Luo Engineering Research Center for High-efficiency Development and Application Technology of Tungsten Resources(Jiangxi University of Science and Technology) Ministry of EducationGanzhou 341000China Jiangxi Province Key Laboratory of Mining and Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou 341000China

Spodumene is a silicate mineral rich in ***,the gangue mineral,albite has similar crystal chemical structure and composition to *** this work,the density functional theory(DFT)calculation was taken to research the floatability from the perspective of crystal *** contact angle test and reagent adsorption test were used to support the simulation *** addition,the weighted total density of broken bonds is proposed for the first time to judge the generation probability of cleavage *** DFT calculation results display that the Na and Al sites on the albite surface are the adsorption sites of water *** the water molecules only bond with Al atom on the surface of spodumene and each Al site can adsorb only one water ***,the wetting effect of water molecules on the albite surface is stronger than that of *** is consistent with the result of contact *** sodium oleate system,the oleic acid anion is adsorbed on the spodumene surface in form of a multicomponent ring while the albite is a single ***,oleic acid anion can be strongly adsorbed on the surface of spodumene and albite under *** adsorption strength of spodumene is higher than that of ***,on hydrated surface,the adsorption strength of oleic acid anion on mineral surface is greatly reduced due to the interaction between water molecules and metal site on mineral ***,spodumene and albite are hard to float without external activated ions in sodium oleate system.

关键词： Spodumene Albite Floatability Crystal chemistry DFT calculation

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Flotation separation of spodumene and albite with activation of calcium ion hydrolysate components

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Rare Metals 2022年第11期41卷 3919-3931页

作者： Xian-Ping Luo Yong-Bing Zhang He-Peng Zhou Fan-Xin Xie Zhi-Zhao Yang Bo-Yuan Zhang Cai-Gui Luo Engineering Research Center for High-Efficiency Development and Application Technology of Tungsten Resources(Jiangxi University of Science and Technology) Ministry of EducationGanzhou341000China Jiangxi Province Key Laboratory of Mining and Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou341000China

It is difficult to separate spodumene and albite by flotation with calcium ion as *** this study,microflotation experiment,solution chemistry calculation,density functional theory(DFT)calculation and X-ray photoelectron spectroscopy(XPS)analysis were conducted to investigate the effect mechanism of c alcium hydrolysate on the flotation separation of spodumene and *** show that the weak interaction intensity of Ca^(2+)with O atoms on the mineral surface makes it difficult to activate minerals *** O atom in the hydroxyl group of Ca(OH)^(+)and Ca(OH)_(2)can be strongly bonded with Al atom on the mineral surface,which greatly improves the adsorption *** the activation of Ca(OH)^(+),the adsorption forms of collectors on the surface of spodumene and albite are quite different,and the adsorption intensity on the surface of spodumene is higher,which is conducive to the flotation separation of spodumene and *** the action of Ca(OH)_(2),the adsorption of the collector on the albite surface is stronger than that of spodumene,which is not conducive to the flotation separation of the two *** adjusting the initial concentration of calcium ions and pulp pH,Ca(OH)^(+)is the main active component,which is the key to improve the separation effect of spodumene and albite.

关键词： Spodumene Albite Calcium ions Hydrolysate components Flotation Separation

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Weakly hydrophobic nanoconfinement by graphene aerogels greatly enhances the reactivity and ambient stability of reactivity of MIL-101-Fe in Fenton-like reaction

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Nano Research 2021年第7期14卷 2383-2389页

作者： Yuwei Zhang Fei Liu Zhichao Yang Jieshu Qian Bingcai Pan Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Research Center for Environmental Nanotechnology(ReCENT) Nanjing UniversityNanjing 210023China

In the pursuit of heterogeneous catalysts with high reactivity,metal organic framework(MOF)nanomaterials have received tremendous ***,many MOF catalysts especially Fe-based MOFs need to be utilized immediately after synthesis or being activated using high temperature,because of the easy loss of reactivity in humid environments resulting from the occupation of active Fe sites by water ***,we describe an inspiring strategy of growing MIL-101-Fe nanoparticles inside the three-dimensional confined space of graphene aerogel(GA),generating shapeable GA/MIL-101-Fe nanocomposite convenient for practical *** to MIL-101-Fe,GA/MIL-101-Fe as catalyst demonstrates much higher reactivity in Fenton-like reaction,attributing to smaller MIL-101-Fe particle size,presence of active Fe(II)sites,and abundant defects in ***,the weakly hydrophobic nature of the composite greatly inhibits the loss of catalytic reactivity after being stored in humid air and accelerates the recovery of reactivity in mild temperature,by resisting the entrance of water molecules and helping to exclude water *** work demonstrates that a delicate design of nanocomposite structure could not only improve the reactivity of the catalytic component,but also overcome its intrinsic drawback by taking advantage of the properties of *** hope this functional nanoconfinement strategy could be extended to more scenarios in other fields.

关键词： nanoconfinement hydrophobicity MIL-101-Fe graphene aerogel Fenton-like reaction

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Construction of Electron-Deficient Co on the Nanotube Arrays Enhances Absorption and Direct Electron Transfer To Accelerate Electrochemical Nitrate Reduction

SSRN

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SSRN 2024年

作者： Gao, Zhifeng Duan, Xueying Yin, Xu Li, Wei Zhu, Hongwei Wei, Kajia Han, Weiqing Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Jiangsu Province Nanjing210094 China

Electrochemical nitrate reduction is a promising remediation strategy for nitrate-contaminated wastewater treatment, and the nitrate adsorption is a prerequisite step in the overall electrochemical process. Herein, the iron-induced cobalt phosphide nanotubes were grown in situ on porous nickel foam (Fe-CoP/NF) for the electrochemical nitrate reduction. Structural characterization verified doping of Fe and the uniform nanotube arrays of Fe0.03CoP/NF. Remarkably, the Fe0.03CoP/NF exhibited a high efficiency nitrate removal efficiency (99.3% within 120 min), 100% ammonia selectivity and excellent nitrogen selectivity (99.8% with anode oxidization). Both experimental and theoretical studies reveal that Fe doping alters the local charge distribution of the Co active centers to form electron-deficient Co. The construction of electron-deficient regions through differences in electronegativity between Co and Fe further enhances the adsorption of nitrate, thereby accelerating the whole electrochemical nitrate reduction process. Furthermore, the formation of electron-deficient centers facilitates the adsorption of nitrate and the reduction of charge transfer resistance. In particular, Fe0.03CoP/NF maintained an excellent conversion efficiency of nitrate to nitrogen (98.4%) with 60 mM Cl− during 10 consecutive cycles and a low electrical consumption of 1.79 kWh·molN-1. This study designed an electrocatalyst for enhancing the electrochemical nitrate reduction activity through enhanced nitrate absorption and H*-mediated and direct electron transfer dominated strategies, thus providing a promising and low-power consumption approach for addressing nitrate pollution. © 2024, The Authors. All rights reserved.

关键词： Nitrates

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Design of copper oxide and oxygen codoped graphitic carbon nitride activator for efficient radical and nonradical activation of peroxymonosulfate

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Chinese Chemical Letters 2023年第6期34卷 184-190页

作者： Lin Wei Jialing Li Chengyun Zhou Biao Song Fanzhi Qin Wenjun Wang Hanzhuo Luo Deyu Qin Cheng Huang Chen Zhang Yang Yang College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution ControlMinistry of Education(Hunan University)Changsha 410082China School of Design Hunan UniversityChangsha 410082China School of Resources and Environment Hunan University of Technology and BusinessChangsha 410205China Department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada

Rational regulation of stable graphitic carbon nitride(CN)for superior peroxymonosulfate(PMS)activation is important in the catalytic degradation of water *** this work,the copper oxide and oxygen co-doped graphitic carbon nitride(Cu O/O-CN)was prepared via one-step synthesis and applied in activating PMS for oxytetracycline(OTC)degradation,displaying superior catalytic *** characterization and theoretical calculations indicated that the synergistic effect between the oxygen site of CN and CuO can modulate the electronic structure of the whole composite further facilitating the formation of non-radical^(1)O_(2)and various reactive *** of the influencing factor experiments revealed that CuO/O-CN has a strong resistance to the environmental *** degradation efficiency of OTC in the real water environment even exceeded that in the deionized *** four successive runs of the optimal catalyst,the OTC removal rate was still as high as 91.3%.This work developed a high-efficiency PMS activator to remove refractory pollutants via both radical pathway and non-radical pathway,which showed a promising potential in the treatment of wastewaters.

关键词： Graphitic carbon nitride Codoping Peroxymonosulfate Antibiotics Advanced oxidation process

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Coupled electron delocalization and multi-dimensional porosity engineering in TiO2 hollow spheres-embedded carbon nanofiber aerogels for efficient photocatalytic aniline degradation

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Chemical Engineering Journal 2025年 515卷

作者： Qi, Lanyue Zhang, Hao Yang, Yue Qi, Junwen Zhou, Yujun Zhu, Zhigao Li, Jiansheng Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science & Technology Nanjing210094 China

The precise synergy of electron delocalization engineering and multi-dimensional porosity processing is a promising strategy for photocatalytic water remediation. Herein, a novel mesoporous TiO2 hollow spheres-embedded carbon nanofiber aerogels (THS-CNFAs) was constructed by anchoring THS into the three-dimensional (3D) porous nanofiber aerogels skeleton using electrospinning and freeze-drying molding followed by pyrolysis. Owing to the interconnected pore network of CNFAs and the high specific surface area of THS, the adsorption efficiency (67%) of aniline by THS-CNFAs was 3.4 and 1.5 folds greater than that of pure THS and CNFAs, respectively. The further DFT calculations confirmed that the existence of Ti-N bond introduces impurity energy levels, causing electron density redistribution and Fermi level shifts. Moreover, the nitrogen-doping induces the generation of oxygen vacancies (O-Vs), which promotes the separation of charge carriers and reduces the adsorption energy of aniline molecules on THS-CNFAs. Thus, the synergistic effects of N-doping and O-Vs greatly facilitated charge transfer to generate •OH, O2•–, and 1O2, resulting in the efficient oxidation of aniline (96%) under visible light. This work provides new insights into the development of photocatalytic nanofiber-constructed aerogels for wastewater treatment. © 2025 Elsevier B.V.

关键词： Carbon nanofibers

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Efficient Electrocatalytic Bromine Evolution and Extraction from Wastewater by Oxygen Vacancy Enriched Ti/Ov-Co3O4-NRs Electrode

SSRN

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SSRN 2024年

作者： Yin, Xu Li, Renping Li, Wei Gao, Zhifeng Wei, Kajia Zhu, Hongwei Gu, Liankai Jiang, Yun Han, Weiqing Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Jiangsu Province Nanjing210094 China

Br−-containing wastewater has the risk of increasing Br− levels in receiving bodies if released into aquatic environments. Electrochemical oxidation is regarded as an ideal method for Br− removal and Br2 extraction because of its simple procedure and high efficiency. In this work, a novel oxygen vacancy enriched Ti/Ov-Co3O4-NRs electrode was fabricated and firstly used for Br− removal and Br2 extraction in Br−-containing wastewater. Characterization and experimental results showed that the Ti/Ov-Co3O4-NR electrode has more prominent bromine evolution reaction (BER) performance than do common electrodes (graphite, Ti/RiO2-Ir, Ti/PbO2, etc.). Notably, the construction of oxygen vacancies obviously accelerated the removal of Br− (53% improvement) by facilitating Br− adsorption and electron transfer. In addition, the effects of factors such as initial pH, initial Br− concentration, current density, coexisting ions and temperature on Br− removal were optimized. The Ti/Ov-Co3O4-NRs electrode also exhibited highly stable catalytic activity and conductivity. After 10 cycles, the removal rate of Br− decreased by 2.20%, and the Br2 production decreased by 3.6%. In actual applications, the unit energy consumption reached 1.59-1.76 kJ·g-1 Br, and the current efficiency remained above 70% throughout the whole treatment process. In addition, more than 80% of the TOC could be removed during Br2 extraction, which was more acceptable than the current reported experimental value of electrochemical Br2 extraction and exhibited great application prospects. © 2024, The Authors. All rights reserved.

关键词： Nanorods

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An application of hierarchical MgAl hydrotalcite in the highly efficient treatment of oilfield macromolecular contaminants

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Environmental Science and pollution Research 2024年第30期31卷 42792-42809页

作者： Yang, Chenye Liu, Qi Li, Tao Zhou, Rui Qu, Chengtun Tang, Ying Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields Xi’an Shiyou University Xi’an China Shaanxi University Engineering Research Center of Oil and Gas Field Chemistry Xi’an Shiyou University Xi’an710065 China Xi’an Alberta Resources & amp Environment Analysis and Testing Technology Co. Ltd Xi’an710000 China

In this work, salicylic acid (SA) was used to induce the self-assembly of octadecyl trimethyl ammonium chloride (OTAC), a cationic surfactant, into three-dimensional wormlike micelle aggregates. These aggregates act as a soft template for hierarchical MgAl hydrotalcite (LDH) to create a multi-level pore structure adsorption material. Scanning electron microscopy characterization showed that the surface of the hierarchical hydrotalcite exhibited a dense layered structure, unlike the monolayer structure of ordinary hydrotalcite. Furthermore, the hierarchical MgAl-LDH possesses a significantly larger specific surface area (113.94 m2/g) and wide pore size distribution ranging more extensively from 2 to 80 nm, which significantly has an impressive adsorption effect on sulfonated lignite (SL), with a maximum adsorption capacity of 192.7 mg/g at pH = 7. Extensive research has been conducted on the adsorption mechanism of hierarchical MgAl-LDH, attributing it to surface adsorption due to the unique multi-level structure of the adsorbent. After two cycles of regeneration experiments, the adsorption capacity of the adsorbent remained at a high level of 179.1 mg/g, demonstrating the excellent renewability of hierarchical MgAl-LDH. Moreover, the hierarchical hydrotalcite showed high adsorption capacity in the adsorption of sulfonated lignite, which was attributed to its larger specific surface area and superior pore structure to expose more active sites. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Adsorption

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Weaning performance prediction in lactating sows using machine learning, for precision nutrition and intelligent feeding

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Animal Nutrition 2025年 21卷 222-233页

作者： Su, Jiayi Kong, Xiangfeng Wang, Wenliang Xie, Qian Wang, Chengming Tan, Bie Wang, Jing Key Laboratory of Hunan Province for the Products Quality Regulation of Livestock and Poultry College of Animal Science and Technology Hunan Agricultural University Changsha 410128 China Laboratory of Animal Nutritional Physiology and Metabolic Process Key Laboratory of Agro-Ecological Processes in Subtropical Region National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production Institute of Subtropical Agriculture Chinese Academy of Sciences Changsha 410125 China Yuelushan Laboratory Changsha 410128 China

Traditional feeding strategy during lactation can result in nutrient deficiencies and negatively impact long-term productivity, compromising both the sustainability and profitability of the swine industry. Precision feeding, supported by decision-making systems built on advanced predictive models, offers a promising solution to address these challenges. This study aimed to develop prediction models for weaning performance, focusing on key indicators such as weaned litter weight (WLW), weaned litter size (WLS), dry matter in milk (DMm), and nitrogen in milk (Nm). The models integrate farm management practices and feed nutrient composition, providing a data-driven framework for optimizing performance. A total of 10,089 observations were collected from 17 trial pig farms across eight provinces in China. Eleven statistical and machine learning (ML) regression algorithms were employed, incorporating stratified sampling and the recursive feature elimination method for feature selection. The findings demonstrated that the ensemble learning models, specifically random forest and gradient boosting decision tree regression, delivered the best overall performance, with a coefficient of determination (R²) ranging from 0.40 to 0.80 and a mean absolute error (MAE) between 0.11 and 4.36. The shapley additive explanations (SHAP) heatmap used for feature importance analysis revealed that, although the key predictors of weaning performance varied across models, this study newly identified lactation duration, birth litter weight, parity, and backfat thickness on the 7th day of lactation (L.d7BF) as consistently important features across different models. The discrepancies between correlation analysis and feature importance suggest the presence of non-linear relationships, feature interactions, and multicollinearity within the dataset. This study presents a novel framework that provides valuable insights into the factors influencing weaning performance under diverse manageme

关键词： Feature selection Lactating sow Machine learning Precision feeding Weaning performance prediction

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Electrophotocatalytic Reductive 1,2-Diarylation of Alkenes with Aryl Halides and Cyanoaromatics

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Chinese Journal of Chemistry 2023年第16期41卷 1921-1930页

作者： Liang Zeng Jing-Hao Qin Gui-Fen Lv Ming Hu Qing Sun Xuan-Hui Ouyang De-Liang He Jin-Heng Li State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan UniversityChangshaHunan 410082China Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle NanchangJiangxi 330063China State Key Laboratory Base of Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdaoShandong 266042China State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhouGansu 730000China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiangHenan 453007China

Comprehensive Summary The radical-mediated reductive functionalization of aryl halides has been extensively ***,the related radical-mediated intermolecular reductive 1,2-diarylation of alkenes,using aryl halides as aryl radical sources,remains ***,a new electrophotocatalytic intermolecular reductive 1,2-diarylation of alkenes is reported using aryl halides and cyanoaromatics to produce polyarylated *** synergistic cathodic reduction and visible-light photoredox catalysis,various electron-rich and electron-deficient aryl halides are combined with various alkenes and cyanoaromatics to characterize the broad substrate scope,excellent functional group compatibility,and excellent selectivity of this *** investigations reveal that this reaction may proceed via a radical process initiated by the reductive generation of aryl radicals from aryl halides and terminated by radical-radical coupling with cyanoaromatic radical anions.

关键词： Alkenes Difunctionalization Organohalides Radical ions Electrophotocatalysis

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