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Li R, Wang Z, Zhao X, Li X, Xie X. Magnetic biochar-based manganese oxide composite for enhanced fluoroquinolone antibiotic removal from water. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:31136-31148. [PMID: 30187413 DOI: 10.1007/s11356-018-3064-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 08/24/2018] [Indexed: 06/08/2023]
Abstract
Magnetic biochar-based manganese oxide composite (MMB) and raw biochar (BC) were synthesized via pyrolysis at a temperature of 500 °C under anoxic conditions of potato stems and leaves, characterized, and successfully used for the removal of norfloxacin (NOR), ciprofloxacin (CIP), and enrofloxacin (ENR) as representative compounds of fluoroquinolone antibiotics (FQs). Characterization results suggested that Fe3O4 and MnOx are the dominant crystals in MMB. MMB possessed large surface area and pore volume than BC. Batch adsorption experiments showed that the maximum adsorption abilities of MMB for norfloxacin (NOR), ciprofloxacin (CIP), and enrofloxacin (ENR) were 6.94, 8.37, and 7.19 mg g-1. In comparison to BC, the adsorption abilities of MMB increased 1.2, 1.5, and 1.6 times for NOR, CIP, and ENR, respectively. The pseudo-second-order kinetic model and the Langmuir model correlated satisfactorily to the experimental data. Thermodynamic studies revealed that the adsorption processes were spontaneous and endothermic. The adsorption capacity of MMB decreased with increasing solution pH (between 3.0 and 10.0) and increasing ionic strength (0.001-0.1). The MMB with high FQ removal efficiency, easy separation, and desirable regeneration ability may have promising environmental applications for the removal of fluoroquinolone antibiotics from water environment.
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Affiliation(s)
- Ruining Li
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Zhaowei Wang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Xiating Zhao
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Xi Li
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Xiaoyun Xie
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China.
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Xiao Y, Liu X, Fang J, Liang Y, Zhang X, Meng D, Yin H. Responses of zinc recovery to temperature and mineral composition during sphalerite bioleaching process. AMB Express 2017; 7:190. [PMID: 29063373 PMCID: PMC5653677 DOI: 10.1186/s13568-017-0491-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 10/14/2017] [Indexed: 11/15/2022] Open
Abstract
Temperature and energy resources (e.g., iron, sulfur and organic matter) usually undergo dynamic changes, and play important roles during industrial bioleaching process. Thus, it is essential to investigate their synergistic effects and the changes of their independent effects with simultaneous actions of multi-factors. In this study, we explored the synergistic effects of temperature and original mineral compositions (OMCs, energy resources) on the sphalerite bioleaching process. The microbial community structure was monitored by 16S rRNA gene sequencing technology and showed clear segregation along temperature gradients and Shannon diversity decreased at high temperature. On the contrary, the physicochemical parameters (pH and [Fe3+]) in the leachate were significantly affected by the OMCs. Interestingly, the influence of temperature on zinc recovery was greater at relatively simpler OMCs level, whereas the influence of OMCs was stronger at lower temperature. In addition, using [Fe3+], pH, relative abundances of dominant OTUs of microbial community and temperature as variable parameters, several models were constructed to predict zinc leaching efficiency, providing a possibility to predict the metal recovery efficiency under temperature change and variable energy resources.
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Xiao Y, Liu X, Dong W, Liang Y, Niu J, Gu Y, Ma L, Hao X, Zhang X, Xu Z, Yin H. Effects of pyrite and sphalerite on population compositions, dynamics and copper extraction efficiency in chalcopyrite bioleaching process. Arch Microbiol 2017; 199:757-766. [PMID: 28260145 DOI: 10.1007/s00203-017-1342-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 08/18/2016] [Accepted: 01/11/2017] [Indexed: 11/28/2022]
Abstract
This study used an artificial microbial community with four known moderately thermophilic acidophiles (three bacteria including Acidithiobacillus caldus S1, Sulfobacillus thermosulfidooxidans ST and Leptospirillum ferriphilum YSK, and one archaea, Ferroplasma thermophilum L1) to explore the variation of microbial community structure, composition, dynamics and function (e.g., copper extraction efficiency) in chalcopyrite bioleaching (C) systems with additions of pyrite (CP) or sphalerite (CS). The community compositions and dynamics in the solution and on the ore surface were investigated by real-time quantitative PCR (qPCR). The results showed that the addition of pyrite or sphalerite changed the microbial community composition and dynamics dramatically during the chalcopyrite bioleaching process. For example, A. caldus (above 60%) was the dominant species at the initial stage in three groups, and at the middle stage, still dominated C group (above 70%), but it was replaced by L. ferriphilum (above 60%) in CP and CS groups; at the final stage, L. ferriphilum dominated C group, while F. thermophilum dominated CP group on the ore surface. Furthermore, the additions of pyrite or sphalerite both made the increase of redox potential (ORP) and the concentrations of Fe3+ and H+, which would affect the microbial community compositions and copper extraction efficiency. Additionally, pyrite could enhance copper extraction efficiency (e.g., improving around 13.2% on day 6) during chalcopyrite bioleaching; on the contrary, sphalerite restrained it.
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Affiliation(s)
- Yunhua Xiao
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Xueduan Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Weiling Dong
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Yili Liang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Jiaojiao Niu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Yabing Gu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Liyuan Ma
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Xiaodong Hao
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Xian Zhang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Zhen Xu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China
| | - Huaqun Yin
- School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China. .,Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China.
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Acres RG, Harmer SL, Shui HW, Chen CH, Beattie DA. Synchrotron scanning photoemission microscopy of homogeneous and heterogeneous metal sulfide minerals. JOURNAL OF SYNCHROTRON RADIATION 2011; 18:649-657. [PMID: 21685683 DOI: 10.1107/s0909049511007175] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Accepted: 02/25/2011] [Indexed: 05/30/2023]
Abstract
Scanning photoemission microscopy (SPEM) has been applied to the investigation of homogeneous and heterogeneous metal sulfide mineral surfaces. Three mineral samples were investigated: homogeneous chalcopyrite, heterogeneous chalcopyrite with bornite, and heterogeneous chalcopyrite with pyrite. Sulfur, copper and iron SPEM images, i.e. surface-selective elemental maps with high spatial resolution acquired using the signal from the S 2p and Cu and Fe 3p photoemission peaks, were obtained for the surfaces after exposure to different oxidation conditions (either exposed to air or oxidized in pH 9 solution), in addition to high-resolution photoemission spectra from individual pixel areas of the images. Investigation of the homogeneous chalcopyrite sample allowed for the identification of step edges using the topography SPEM image, and high-resolution S 2p spectra acquired from the different parts of the sample image revealed a similar rate of surface oxidation from solution exposure for both step edge and a nearby terrace site. SPEM was able to successfully distinguish between chalcopyrite and bornite on the heterogeneous sample containing both minerals, based upon sulfur imaging. The high-resolution S 2p spectra acquired from the two regions highlighted the faster air oxidation of the bornite relative to the chalcopyrite. Differentiation between chalcopyrite and pyrite based upon contrast in SPEM images was not successful, owing to either the poor photoionization cross section of the Cu and Fe 3p electrons or issues with rough fracture of the composite surface. In spite of this, high-resolution S 2p spectra from each mineral phase were successfully obtained using a step-scan approach.
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Affiliation(s)
- Robert George Acres
- Ian Wark Research Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia
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Acres RG, Harmer SL, Beattie DA. Synchrotron PEEM and ToF-SIMS study of oxidized heterogeneous pentlandite, pyrrhotite and chalcopyrite. JOURNAL OF SYNCHROTRON RADIATION 2010; 17:606-615. [PMID: 20724782 DOI: 10.1107/s0909049510026749] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Accepted: 07/06/2010] [Indexed: 05/29/2023]
Abstract
Synchrotron-based photoemission electron microscopy (PEEM; probing the surface region) and time-of-flight secondary ion mass spectrometry (ToF-SIMS; probing the uppermost surface layer) have been used to image naturally heterogeneous samples containing chalcopyrite (CuFeS(2)), pentlandite [(Ni,Fe)(9)S(8)] and monoclinic pyrrhotite (Fe(7)S(8)) both freshly polished and exposed to pH 9 KOH for 30 min. PEEM images constructed from the metal L(3) absorption edges were acquired for the freshly prepared and solution-exposed mineral samples. These images were also used to produce near-edge X-ray absorption fine-structure spectra from regions of the images, allowing the chemistry of the surface of each mineral to be interrogated, and the effect of solution exposure on the mineral surface chemistry to be determined. The PEEM results indicate that the iron in the monoclinic pyrrhotite oxidized preferentially and extensively, while the iron in the chalcopyrite and pentlandite underwent only mild oxidation. The ToF-SIMS data gave a clearer picture of the changes happening in the uppermost surface layer, with oxidation products being observed on all three minerals, and significant polysulfide formation and copper activation being detected for pyrrhotite.
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Brito e Abreu S, Brien C, Skinner W. ToF-SIMS as a new method to determine the contact angle of mineral surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:8122-8130. [PMID: 20180578 DOI: 10.1021/la904443s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) has been used as a technique to correlate the surface chemistry of chalcopyrite particles with their contact angle. Three particle sizes (20-38, 75-105, and 150-210 microm) were used, covering a range of contact angles between 20 and 90 degrees. Multivariate statistical techniques were applied to the ToF-SIMS data in order to identify structure in the data and the surface species contributing the most to surface chemistry and hence the hydrophobicity variation. A method to calculate the contact angle of chalcopyrite by ToF-SIMS surface analysis has been developed using only information from three secondary ions: oxygen, sulfur, and a thiol collector fragment. This approach is capable of determining the surface chemistry contribution to the contact angle of individual mineral particles and the distribution of contact angles within a large ensemble of particles. Further measurements verified that the methodology can also be applied to flat surfaces, enabling rapid surface chemistry-hydrophobicity correlations to be made on a wide range of mineral and material systems.
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Affiliation(s)
- Susana Brito e Abreu
- Ian Wark Research Institute, ARC Special Research Centre for Particle and Material Interfaces, University of South Australia, Mawson Lakes, South Australia 5095, Australia
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