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Facet-Controlled LiMn_(2)O_(4)/C as Deionization Electrode with Enhanced Stability and High Desalination Performance

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Nano-Micro Letters 2022年第11期14卷 75-86页

作者： Yuxin Jiang Liyuan Chai Dehe Zhang Fangping Ouyang Xiangyuan Zhou sikpaam ialhassan Sailin Liu Yingjie He Lvji Yan Haiying Wang Wenchao Zhang School of Metallurgy and Environment Central South UniversityChangsha 410083People’s Republic of China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Changsha 410083People’s Republic of China Water Pollution Control Technology Key Lab of Hunan Province Changsha 410083People’s Republic of China School of Physics and Electronics Hunan Key Laboratory for Super-Microstructure and Ultrafast Processand Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083People’s Republic of China State Key Laboratory of Powder Metallurgy and Powder Metallurgy Research InstituteCentral South UniversityChangsha 410083People’s Republic of China School of Chemical Engineering and Advanced Materials Faculty of SciencesEngineering and TechnologyThe University of AdelaideAdelaide 5005Australia

Battery materials as emerging capacitive deionization electrodes for desalination have better salt removal capacities than traditional carbon-based ***_(2)O_(4),a widely used cathode mate-rial,is difficult to utilize as a deionization electrode due to its structural instability upon cycling and Mn dissolution in aqueous-based ***,a facile and low-cost ball-milling routine was proposed to prepare a LiMn_(2)O_(4)material with highly exposed(111)*** prepared electrode exhibited relatively low dissolution of Mn during cycling,which shows its long cycle *** the hybrid capacitive deionization system,the LiMn_(2)O_(4)/C electrode delivered a high desalination capacity of 117.3 mg g^(−1) without obvious capacity decay at a voltage of 1.0 V with a 20 mM initial salt *** addition,the exposed(111)facets significantly alleviated Mn ion dissolution,which also enhanced the structural steadiness.

关键词： Deionization electrode Desalination Lithium-ion battery

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Preparation of 2D carbon ribbon/Al_(2)O_(3) and nitrogen-doped carbon ribbon/Al_(2)O_(3) by using MOFs as precursors for removing high-fluoride water

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Transactions of Nonferrous Metals Society of China 2021年第7期31卷 2174-2188页

作者： Lei HUANG Zhi-hui YANG LÜ-ji YAN sikpaam Issaka ALHASSAN Hai-yin GANG Ting WANG Hai-ying WANG School of Metallurgy and Environment Central South UniversityChangsha 410083China National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Central South UniversityChangsha 410083China School of Environmental Science and Engineering Guangzhou UniversityGuangzhou 510006China

2D carbon ribbon/Al_(2)O_(3) was synthesized with two-dimensional metal organic frameworks 2D-MOFs as precursors using the solvothermal and calcination *** experiments of adsorption parameters such as pH,liquid/solid ratio,adsorption kinetics,adsorption thermodynamics,and anions competitions were investigated to understand the adsorptive behavior of fluoride on carbon ribbon/Al_(2)O_(3) and nitrogen-doped carbon ribbon/Al_(2)O_(3).The adsorption of fluoride on carbon ribbon/Al_(2)O_(3) could be described as the chemical and multilayer adsorption,while the adsorption of fluoride on nitrogen-doped carbon ribbon/Al_(2)O_(3) followed the chemical and monolayer adsorption *** fluoride on nitrogen-doped carbon ribbon/Al_(2)O_(3) had a much faster adsorption rate of 3.1×10^(−7) m/s than carbon ribbon/Al_(2)O_(3),which was 1.2×10^(−7) m/*** nitrogen-doping on carbon ribbon enhances structural defects and improves the adsorption performance of ***,the diacetylene linkages(—C≡C—)and pyridinic-N were studied to understand their influences on removing *** result indicates that carbon ribbon and nitrogen-doped ribbon could serve as good adsorbents for removing fluoride.

关键词： pyridinic-N carbon ribbon MIL-53(Al) adsorption fluoride removal

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Highly efficient fluoride removal from water using 2D metal-organic frameworks MIL-53(Al)with rich Al and O adsorptive centers

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Environmental Science and Ecotechnology 2021年第4期8卷 31-40页

作者： Lei Huang Zhihui Yang sikpaam Issaka Alhassan Zhixuan Luo Baocheng Song Linfeng Jin Yixian Zhao Haiying Wang School of Metallurgy and Environment Central South UniversityChangsha410083PR China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Changsha410083PR China School of Environmental Science and Engineering Guangzhou UniversityGuangzhou510006China Fujian Environmental Protection Design Institute Co.Ltd Fuzhou350000PR China School of Material Science and Engineering Central South UniversityChangsha410083PR China

In this study,metal-organic framework MIL-53(Al)was synthesized and studied to understand the different mechanisms between normal MIL-53(Al)and 2D metal-organic framework MIL-53(Al)for removing ***,the 2D MIL-53(Al)had two-dimensional linear morphology rather than block shape,indicating more expose adsorptive sites than normal MIL-53(Al).The batch adsorption experiments were applied to investigate the performance of 2D MIL-53(Al),including pH,adsorption kinetics,and *** 2D MIL-53(Al)(75.50 mg/g)showed better adsorption capacity than normal MIL-53(Al)(35.63 mg/g).The adsorption process of 2D MIL-53(Al)followed the pseudo-firstorder model and Langmuir *** adsorption mechanism of this material was further studied by using experimental characterization and density functional theory calculations in *** main adsorptive sites were Al and O in the 2D MIL-53(Al),and the relationship between fluoride binding with Al and O was HF^(-)_(2)>HF>F^(-).The species of fluoride were HF2,HF,F at different pH and ***,this study provides a significant way on the application of two-dimensional materials for removing fluoride.

关键词： Two dimensions Metal-organic frameworks MIL-53(Al) Fluoride Adsorption

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多晶铝土矿纳米复合物的原位优化合成及其工业废水除氟应用

多晶铝土矿纳米复合物的原位优化合成及其工业废水除氟应用

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作者： Issaka sikpaam Alhassan（司马朋）中南大学

学位级别：硕士

铝土矿是一种广泛使用的富含Al-O的矿物,成本低廉,在处理高氟废水方面具有巨大潜力。然而,目前的铝土矿衍生吸附剂仍存在除氟能力低、适用p H范围窄、除氟机理不明确等问题。低表面亲和力,以及表面官能团不足,尤其是表面·OH自由基不足... 详细信息

铝土矿是一种广泛使用的富含Al-O的矿物,成本低廉,在处理高氟废水方面具有巨大潜力。然而,目前的铝土矿衍生吸附剂仍存在除氟能力低、适用p H范围窄、除氟机理不明确等问题。低表面亲和力,以及表面官能团不足,尤其是表面·OH自由基不足是导致铝土矿吸附剂吸附性能差的关键因素,使其无法应用于工业废水除氟。在本研究中,通过在预处理的Bx-HCl上进行两阶段原位La/Ce共掺杂和热解,合成了一种高效的多晶铝土矿纳米复合材料(Bx-Ce-La@500),并将其应用于处理含氟工业废水。进行了多阶段批量规模和固定床柱吸附实验,以研究Bx-Ce-La@500的动态吸附性能。此外,通过结构表征和密度泛函理论(DFT)计算,阐明了共掺杂La/Ce对所制备的预处理Bx-HCl的协同作用以及热解提高Bx-Ce-La@500吸附性能的机制。研究思路如下:(1)采用四水合硫酸铈和六水合硝酸镧预处理Bx-HCl,制备得到了La/Ce共掺杂的铝土矿材料。此外,通过调整La/Ce摩尔比来优化性能,并制备了一系列具有不同La/Ce掺杂量的Bx-Ce-La复合材料。最后,材料的zeta电位提高了,p H 1时为26.3 m V,p H10时为23.1 m V,从而提高了其吸附性能。(2)此外,对材料进行了进一步处理,通过在400-600℃下进行BxCe-La热处理来促进表面·OH自由基的形成,发现在处理温度为500℃时所合成的Bx-Ce-La@500复合材料具有最高的氟化物吸附能力。Bx-Ce-La@500具有不规则形貌,平均粒径为18 nm,而原始铝土矿则具有无定形晶型和较大的粒径。采用多级分批和固定床柱吸附,在相同条件下,Bx-Ce-La@500的氟吸附量可达到88.13 mg/g,是盐酸处理铝土矿Bx-HCl的6倍。在固定床柱中Bx-Ce-La@500的氟吸附量为27.99 mg/g。(3)基于相关结构表征和DFT理论计算,分析了热解后Bx-CeLa@500中的相变以及各种晶相的键/结合能。此外,分子水平的研究揭示了氟吸附性能强化的机制。图37幅,表12个,参考文献154篇

关键词：铝土矿氟化物纳米复合材料吸附废水共掺杂

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