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      Creation of Hollow Calcite Single Crystals with CQDs: Synthesis, Characterization, and Fast and Efficient Decontamination of Cd(II)

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          Abstract

          In this work, carbon quantum dots were first prepared through one-pot hydrothermal route of the propyl aldehyde and sodium hydroxide via an aldol condensation reaction, and a novel solid-phase extraction adsorbent of hollow calcite single crystals was prepared via the precipitation of metal nitrates by the CO 2 diffusion method in the presence of CQDs and further applied for excessive Cd(II) ions removal from water. The spectra and morphologies of the etched calcite were investigated by X-ray diffraction, Fourier transform infrared spectrometry, Scanning electron microscope, and Transmission electron microscopy. The results show that the CQDs etching technique successfully furnish a strategy for manufacturing interface defects onto the calcite crystal. Bath studies were done to evaluate the effects of the major parameters onto Cd(II) adsorption by the etched calcite, such as pH, contact time, and initial Cd(II) concentration. The Cd(II) adsorption onto the new adsorbent could reach a maximum adsorption amount of 66.68 mg/g at 120 min due to the abundant exterior adsorption sites on the adsorbent. The adsorption kinetics and adsorption isotherms of Cd(II) on the etched calcite were also investigated. The experimental datum showed that the adsorption kinetics and isotherms of Cd(II) on the etched calcite were well-fitted by the pseudo-second-order kinetic model and the Freundlich isotherm model respectively. The adsorption mechanisms could be primarily explained as the formation of Cd(OH) 2 and Ca xCd 1−xCO 3 solid solution on the adsorbent surface with the help of X-ray photoelectron spectroscopy.

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          THE ADSORPTION OF GASES ON PLANE SURFACES OF GLASS, MICA AND PLATINUM.

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            Oberflächeneinflüsse beim Bler und bei der Bierbereitung: Emslander, Fritz, und Freundlich, Herbert, (Zeitschr. f. phys. Chem. 49, 317, 1904)

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              The kinetics of sorption of divalent metal ions onto sphagnum moss peat

              Andrew Ho (2000)
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                Author and article information

                Contributors
                wenlei_wang@hotmail.com
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                4 December 2018
                4 December 2018
                2018
                : 8
                : 17603
                Affiliations
                [1 ]GRID grid.440660.0, College of Science, , Central South University of Forestry and Technology, ; Changsha, 410004 China
                [2 ]Key Laboratory for Digital Dongting Lake Basin of Hunan Province, Changsha, 410004 China
                [3 ]Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, Ministry of Education, Changsha, 410004 China
                Article
                36044
                10.1038/s41598-018-36044-5
                6279770
                30514918
                02b283c7-0808-42bb-8c6c-59c0a6b463be
                © The Author(s) 2018

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 18 June 2018
                : 12 November 2018
                Funding
                Funded by: FundRef https://doi.org/10.13039/501100001809, National Natural Science Foundation of China (National Science Foundation of China);
                Award ID: 21607176
                Award Recipient :
                Funded by: the Natural Science Foundation of Hunan Province, China (Grant No. 2017JJ3516) the Research Foundation of Education Bureau of Hunan Province, China (Grant No. 16B274) the Open Fund for Key Discipline of Forestry of Central South University of Forestry and Technology (Grant No. 2016ZD11).
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