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Zhao Z, Wang Z, Xu W, Qin W, Lei J, Dong Z, Liang Y. Arsenic removal from copper slag matrix by high temperature sulfide-reduction-volatilization. JOURNAL OF HAZARDOUS MATERIALS 2021; 415:125642. [PMID: 34088174 DOI: 10.1016/j.jhazmat.2021.125642] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 03/06/2021] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
Arsenic contamination has been a major problem in copper slag utilization. Arsenic is easily incorporated into the silicate-based matrix, making the arsenic difficult to volatilize. In this study, pyrite was selected to depolymerize the matrix structure and volatilize the glassy arsenic by sulfide-reduction-volatilization reaction. The optimum technological parameters and mechanism of glassy arsenic volatilization by pyrite were further studied. The optimum operating parameters for glassy arsenic volatilization by pyrite were determined to be a temperature of 1200 °C, a holding time of 60 min, a heating rate of 5 °C/min, a basicity of 0.3, and a pyrite addition content of 15%. The arsenic volatilization ratio reached 80.9% under these experimental conditions. Besides, the mechanism of glassy arsenic volatilization was elucidated by XRD, XPS, FTIR, and SEM analyses. These results indicate that, with the increase in temperature, the pyrite decomposes to generate a variety of sulfur-based reducing substances (FeS, FeS1-x, S2(g)). Through "oxygen capture reaction", these sulfur-based reducing substances depolymerize the bridging oxygen structure from the glass former ([AsO4], [FeO4], and [SiO4]) by the conversion of (Q2 +Q3)→(Q0 +Q1) and result in the precipitation of glass former ([AsO4], [FeO4] and [SiO4]) combining with the nearby cation. In this process, the glassy arsenic is released by the glass network and participates in reductive volatilization reaction with sulfur-based reducing substances, converting the glassy arsenic with high thermal stability to volatile arsenic oxide and arsenic sulfide. These findings provide a theoretical support for the in situ volatilization of arsenic in copper smelting and centralized control of arsenic contamination.
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Affiliation(s)
- Zongwen Zhao
- School of Metallurgy & Environment, Central South University, 410083 Changsha, Hunan, China; Postdoctoral Mobile Station of Central South University, 410083 Changsha, Hunan, China; Dongjiang Environmental Co., Ltd., 518057 Shenzhen, Guangdong, China
| | - Zhongbing Wang
- School of Metallurgy & Environment, Central South University, 410083 Changsha, Hunan, China; Postdoctoral Mobile Station of Central South University, 410083 Changsha, Hunan, China; Dongjiang Environmental Co., Ltd., 518057 Shenzhen, Guangdong, China
| | - Wenbin Xu
- Dongjiang Environmental Co., Ltd., 518057 Shenzhen, Guangdong, China
| | - Weining Qin
- Dongjiang Environmental Co., Ltd., 518057 Shenzhen, Guangdong, China
| | - Jie Lei
- Green Eco-Manufacture Co., Ltd., 518101 Shenzhen, Guangdong, China
| | - Zhunqin Dong
- Shandong Humon Smelting Co., Ltd., Yantai 264109, China
| | - Yanjie Liang
- School of Metallurgy & Environment, Central South University, 410083 Changsha, Hunan, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, 410083 Changsha, Hunan, China.
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Cisplatin-functionalized nanodiamonds: preparation and characterization, with potential antineoplastic application. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01955-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Freimann SA, Prescimone A, Housecroft CE, Constable EC. Turning over on sticky balls: preparation and catalytic studies of surface-functionalized TiO 2 nanoparticles. RSC Adv 2021; 11:5537-5547. [PMID: 35423103 PMCID: PMC8694772 DOI: 10.1039/d0ra09319j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 01/22/2021] [Indexed: 12/21/2022] Open
Abstract
We have investigated the reactivity of rhodium(iii) complex-functionalized TiO2 nanoparticles and demonstrate a proof-of-principle study of their catalytic activity in an alcohol oxidation carried out under aqueous conditions water in air. TiO2 nanoparticles (NPs) have been treated with (4-([2,2':6',2''-terpyridin]-4'-yl)phenyl)phosphonic acid, 1, to give the functionalized NPs (1)@TiO2. Reaction between (1)@TiO2 NPs and either RhCl3·3H2O or [Rh2(μ-OAc)4(H2O)2] produced the rhodium(iii) complex-functionalized NPs Rh(1)2@TiO2. The functionalized NPs were characterized using thermogravimetric analysis (TGA), matrix-assisted laser desorption ionization (MALDI) mass spectrometry, 1H NMR and FT-IR spectroscopies; the single crystal structures of [Rh(1)2][NO3]3·1.25[H3O][NO3]·2.75H2O and of a phosphonate ester derivative were determined. 1H NMR spectroscopy was used to follow the reaction kinetics and to assess the recyclability of the NP-supported catalyst. The catalytic activity of the Rh(1)2@TiO2 NPs was compared to that of a homogeneous system containing [Rh(1)2]3+, confirming that no catalytic activity was lost upon surface-binding. Rh(1)2@TiO2 NPs were able to withstand reaction temperatures of up to 100 °C for 24 days without degradation.
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Affiliation(s)
- Sven A Freimann
- Department of Chemistry, University of Basel BPR 1096, Mattenstrasse 24a CH-4058 Basel Switzerland
| | - Alessandro Prescimone
- Department of Chemistry, University of Basel BPR 1096, Mattenstrasse 24a CH-4058 Basel Switzerland
| | - Catherine E Housecroft
- Department of Chemistry, University of Basel BPR 1096, Mattenstrasse 24a CH-4058 Basel Switzerland
| | - Edwin C Constable
- Department of Chemistry, University of Basel BPR 1096, Mattenstrasse 24a CH-4058 Basel Switzerland
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Xantini Z, Erasmus E. Platinum supported on nanosilica and fibrous nanosilica for hydrogenation reactions. Polyhedron 2021. [DOI: 10.1016/j.poly.2020.114769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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5
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Spectroscopic characterisation of Grubbs 2nd generation catalyst and its p-cresol derivatives. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Mughal EU, Mirzaei M, Sadiq A, Fatima S, Naseem A, Naeem N, Fatima N, Kausar S, Altaf AA, Zafar MN, Khan BA. Terpyridine-metal complexes: effects of different substituents on their physico-chemical properties and density functional theory studies. ROYAL SOCIETY OPEN SCIENCE 2020; 7:201208. [PMID: 33391801 PMCID: PMC7735333 DOI: 10.1098/rsos.201208] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 10/07/2020] [Indexed: 06/12/2023]
Abstract
A series of different substituted terpyridine (tpy)-based ligands have been synthesized by Kröhnke method. Their binding behaviour was evaluated by complexing them with Co(II), Fe(II) and Zn(II) ions, which resulted in interesting coordination compounds with formulae, [Zn(tpy)2]PF6, [Co(tpy)2](PF6)2, [Fe(tpy)2](PF6)2 and interesting spectroscopic properties. Their absorption and emission behaviours in dilute solutions were investigated in order to explain structure-property associations and demonstrate the impact of different aryl substituents on the terpyridine scaffold as well as the role of the metal on the complexes. Photo-luminescence analysis of the complexes in acetonitrile solution revealed a transition from hypsochromic to bathochromic shift. All the compounds displayed remarkable photo-luminescent properties and various maximum emission peaks owing to the different nature of the functional groups. Furthermore, the anti-microbial potential of ligands and complexes was evaluated with docking analyses carried out to investigate the binding affinity of terpyridine-based ligands along with corresponding proteins (shikimate dehydrogenase and penicillin-binding protein) binding sites. To obtain further insight into molecular orbital distributions and spectroscopic properties, density functional theory calculations were performed for representative complexes. The photophysical activity and interactions between chromophore structure and properties were both investigated experimentally as well as theoretically.
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Affiliation(s)
| | - Masoud Mirzaei
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, PO Box 9177948974, Mashhad, Iran
| | - Amina Sadiq
- Department of Chemistry, Government College Women University, Sialkot 51300, Pakistan
| | - Sana Fatima
- Department of Chemistry, University of Gujarat, Gujarat 50700, Pakistan
| | - Ayesha Naseem
- Department of Chemistry, University of Gujarat, Gujarat 50700, Pakistan
| | - Nafeesa Naeem
- Department of Chemistry, University of Gujarat, Gujarat 50700, Pakistan
| | - Nighat Fatima
- Department of Pharmacy, COMSATS University Islamabad, Abbottabad Campus, 22060, Pakistan
| | - Samia Kausar
- Department of Chemistry, University of Gujarat, Gujarat 50700, Pakistan
| | - Ataf Ali Altaf
- Department of Chemistry, University of Gujarat, Gujarat 50700, Pakistan
- Department of Chemistry, University of Okara, Okara 56300, Pakistan
| | | | - Bilal Ahmad Khan
- Department of Chemistry, University of Azad Jammu and Kashmir, Muzaffarabad, Pakistan
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Miao Z, Chen L, Chen K, Zhang X, Zhang Y, Wu J. Physical properties and microstructures of residual carbon and slag particles present in fine slag from entrained-flow coal gasification. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.07.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Cueto Díaz EJ, Gálvez-Martínez S, Torquemada Vico MC, Valles González MP, Mateo-Martí E. 2-D organization of silica nanoparticles on gold surfaces: CO 2 marker detection and storage. RSC Adv 2020; 10:31758-31764. [PMID: 35518154 PMCID: PMC9056548 DOI: 10.1039/d0ra04770h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 08/01/2020] [Indexed: 11/21/2022] Open
Abstract
A single layer of silica nanoparticles with an average size of ∼200 nm was deposited over the surface of pristine gold wafers, aided by (3-mercaptopropyl)trimethoxysilane.
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Affiliation(s)
| | | | - Ma Carmen Torquemada Vico
- National Institute of Aerospace Technology (INTA)
- Department of Payloads and Space Sciences
- Torrejon de Ardoz
- Spain
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Parrott LK, Erasmus E. Palladium/graphene oxide nanocomposites with carbon nanotubes and/or magnetite for the reduction of nitrophenolic compounds. RSC Adv 2020; 10:32885-32896. [PMID: 35516474 PMCID: PMC9056596 DOI: 10.1039/d0ra04715e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 08/28/2020] [Indexed: 11/23/2022] Open
Abstract
Graphene oxide (GO) was synthesised via the oxidation of graphite and was characterised using ATR FTIR, PXRD, SEM, TEM and TGA. These techniques confirmed the presence of characteristic oxygen-containing functional groups and the resulting increase in interlayer spacing in the nanostructure. GO is used as the support to form nanocomposites composed of combinations of the following: iron oxide nanoparticles (Fe3O4), carbon nanotubes (CNT) and palladium nanoparticles (Pd). The four final nanocomposites formed are: Pd/GO, Pd/Fe3O4/GO, Pd/CNT/GO, and Pd/CNT/Fe3O4/GO. Key intermediates were analysed using ATR FTIR for the confirmation of the modification. Additionally, all composites and their precursors underwent electron microscopic analysis to visually assess composite morphologies and the size distribution of deposited nanoparticles. The Fe3O4 and Pd nanoparticles were indistinguishable from each other in their spherical shape and particle diameters, which were no bigger than 32 nm. From the TGA, incorporation of Fe3O4, CNT and finally Pd into the nanocomposites increased total thermal stability in terms of mass percentage lost over the temperature programme. GO showed significant decomposition, with all nanocomposites remaining relatively stable up to 120 °C. ICP OES results showed total Pd content by mass percentage for each final composite, varied from 7.9% to 9.1% mass Pd/collective mass. XPS confirmed the expected elemental compositions of composites according to their structures and the Pd0 : PdII ratios are obtained. The nanocomposites were tested for the catalytic reduction of nitrophenols. Pd/CNT/Fe3O4/GO gave the highest TOF′ for the reduction of 4-NP and 2-NP. For the reduction of 3-NP, Pd/GO showed the highest TOF′. Nitrophenol's pKa and catalyst TOF′ correlated in a direct proportional relationship for Pd/GO and Pd/Fe3O4/GO. It was found that Pd0 surpassed PdII in catalytic activity. Reduction of PdII to Pd0 took place during the first catalytic cycle. Comparison of the catalytic activity for the reduction of nitrophenol over palladium-supported graphene oxide nanocomposites modified with iron oxide nanoparticles and/or carbon nanotubes.![]()
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Affiliation(s)
- L. K. Parrott
- Department of Chemistry
- University of the Free State
- Bloemfontein 9300
- South Africa
| | - E. Erasmus
- Department of Chemistry
- University of the Free State
- Bloemfontein 9300
- South Africa
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Zhang Y, Li H, Wu C. Study on distribution, chemical states and binding energy shifts of elements on the surface of gasification fine ash. RESEARCH ON CHEMICAL INTERMEDIATES 2019. [DOI: 10.1007/s11164-019-03824-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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