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Adsorption of sodium oleate at the microfine hematite/aqueous solution interface and its consequences for flotation

International Journal of Mining Science and Technology 2023年第1期33卷 105-113页

作者： Shaojun Bai Jie Li Yunxiao Bi Jiaqiao Yuan Shuming Wen Zhan Ding State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming 650093China

The adsorption of sodium oleate(NaOL)at the microfine hematite/aqueous solution interface was investigated in this *** research indicated that negative effects stemmed from the dissolution of the microfine hematite(D50=19.21μm)could be effectively eliminated via the appropriate dosage of NaOL at alkali pH *** chemistry calculation and adsorption test results indicated that RCOOand(RCOO)_(2)^(2-) ions were responsible for microfine hematite flotation at pH *** potential and FTIR measurements confirmed the co-adsorption of molecular and ionic oleate species occurred at pH 8.2.X-ray photoelectron spectroscopy(XPS)results further indicated that oleate species interacted with hematite surfaces mainly through chemisorption,giving rise to molecule/colloid formation of oleate and Fe―OL complex ***-of-flight secondary ion mass spectrometry(ToF-SIMS)results demonstrated that oleate species adsorbed onto the hematite surfaces with a thickness of a few ***,the normalized peak intensity of C4H7+ions on the hematite sample at pH 8.2 increased remarkably comparing with corresponding result of hematite sample at pH *** new findings of the present study well revealed the dissolution of microfine hematite and the pH effects on the hematite flotation,as well as the adsorption characteristics of oleate species.

关键词： Microfine hematite Oleate species chemisorptions Dissolution ToF-SIMS

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Microwave-assisted synthesis of Cr_(3)C_(2)@C core shell structure anchored on hierarchical porous carbon foam for enhanced polysulfide adsorption in Li-S batteries

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Nano Research 2021年第7期14卷 2345-2352页

作者： Xierong Zeng Jianxin Tu Shuangshuang Chen Shaozhong Zeng Qi Zhang Jizhao Zou Kezhi Li Shenzhen Key Laboratory of Special Functional Materials&Shenzhen Engineering Laboratory for Advance Technology of ceramics College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Solidification Processing Carbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Anhui University of TechnologyMa'anshan 243002China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China BCMaterials Basque Center for MaterialsApplications and NanostructuresUPV/EHU Science Park48940 LeioaSpainIKERBASQUEBasque Foundation for Science48013 BilbaoSpain

In this paper,we use microwave reduction strategy to synthesize a new bi-functional sulfur host material at the service of cathode substrate for lithium-sulfur batteries(LSBs),the composite is made of hierarchical porous carbon foam supported carbon-encapsulated chromium carbide nano-particles(Cr_(3)C_(2)@C/HPCF),in which the well-distributed conductive Cr_(3)C_(2) nano-particles can act as powerful chemical adsorbent and are effective in restraining the shuttle effect of lithium polysulfides(LiPSs).Test results show that the Cr_(3)C_(2)@C/HPCF based sulfur electrodes with 75 wt.%of sulfur exhibit a high initial discharging capacity of 1,321.1 mAh·g^(−1) at 0.1 C(3.5 mg·cm^(−2)),and a reversible capacity can still maintain stability at 1,002.1 mAh·g^(−1) after 150 *** increasing the areal sulfur loading to 4 mg·cm^(−2),the electrodes can still deliver an initial discharging capacity of 948.0 mAh·g^(−1) at 0.5 C with ultra-slow capacity decay rate of 0.075%per cycle during 500 ***,the adsorption energy between the Cr_(3)C_(2) surface and LiPSs as well as theoretic analysis based on first-principles is also investigated.

关键词： Cr_(3)C_(2)nanoparticles core shell structure chemisorptions microwave reduction hierarchical porous carbon foam Li-S batteries

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Flocculation Mechanism of Synthetic Goethite Suspension Using Hydroxamated Polymer and Sodium Polyacrylate

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过程工程学报 2016年第3期16卷 452-462页

作者：王梦胡慧萍陈湘攀刘锦伟陈启元 College of Chemistry and Chemical Engineering Central South University

The flocculation effects of homemade hydroxamated flocculant(HPAA)and commercially available sodium polyacrylate(PAAS)on synthetic goethite suspensions with different solid contents were *** adsorption mechanism of HPAA or PAAS on the surfaces of goethite was *** settling rate of 50 g/L goethite suspension with HPAA(1.74 m/h)was faster than that with PAAS(0.54 m/h),which indicated that HPAA exhibits better flocculation performance than PAAS *** could be found that the stretching vibration of carbonyl band in hydroxamic acid groups of HPAA was downshifted from 1 654 cm^(-1) to 1 645 cm^(-1) and a new adsorption band appeared at 1 455 cm-1,which demonstrated that a five-membered ring chelate may be formed among iron atoms of goethite surfaces,the hydroxyl groups and the carbonyl groups in hydroxamic acid groups of *** the case of PAAS,the separation of the asymmetric and symmetric stretches of the carboxylate groups in adsorbed PAAS was 163 cm-1,which was greater than that of unadsorbed PAAS with 157 cm^(-1).There was no indication of a contribution from the monodentate adsorption between iron atoms of goethite surfaces and carboxylate groups of PAAS,but there may exist a bi-dentate bridging *** with synthetic goethite,XPS curve fittings of Fe 2p spectra showed that the binding energies of the main Fe 2p3/2 and Fe 2p1/2 resolved peaks on HPAA-treated goethite surfaces were correspondingly decreased by 0.9 and 0.7 e V,while those on PAAS-treated goethite surfaces were correspondingly decreased by 0.7 and 0.3 e *** characteristic N 1s peak of HPAA and C 1s peak of PAAS were correspondingly detected on HPAA-treated and PAAS-treated goethites,and a binding energy change of N 1s spectrum of adsorbed HPAA was *** relative atomic ratios of C/Fe,N/Fe and O/Fe on HPAA-treated and PAAS-treated goethite surfaces were *** the results suggested that HPAA or PAAS was adsorbed on the goethite surfaces by the chemisorpt

关键词： flocculation mechanism hydroxamated polymer sodium polyacrylate chemisorptions

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Assessing Lead Removal from Contaminated Water Using Solid Biomaterials: Charcoal, Coffee, Tea, Fishbone, and Caffeine

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Journal of Environmental Protection 2013年第7期4卷 741-745页

作者： Lovell Agwaramgbo Nichole Lathan Shelby Edwards ShaKayla Nunez Chemistry Department Dillard University New Orleans USA.

Previous research has documented that solid biomaterials such as charcoal or waste coffee and tea have been used to remove heavy metals from contaminated aqueous solutions through adsorption. However, these studies used very low heavy metal concentrations between 10 to 100 ppm. Recently published research work reported that extracts of edible plants and fruits were able to effectively remove lead from contaminated aqueous solution. This paper evaluates the ability of charcoal, un-brewed coffee and tea, fishbone, and caffeine to remove lead from contaminated aqueous solutions. The order of lead removal from 1300 ppm of lead solution is Charcoal (100%) > Tea (97%) > Coffee Ground (88%) > Instant Coffee (83.5%) > Coffee Bean (82%) > Fishbone (76%) > Caffeine (1.3%). These results clearly demonstrate that not all solid biomaterials can adsorb lead and that caffeine, a component of coffee and tea does not participate in the removal of lead from contaminated solutions. Furthermore, the results suggest that two possible processes may be involved in the reactions presented here: adsorption of lead by the solid substrates and precipitation of lead by the solubilized biochemical components of the substrates.

关键词： Heavy Metals chemisorptions Coffee Lead Fishbone Phytoremediation

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