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Jin S, Shi Q, Ou L. Hydrophobic Flocculation of Fine Cassiterite Using Alkyl Hydroxamic Acids with Different Carbon Chain Lengths as Collectors. Molecules 2023; 28:molecules28093911. [PMID: 37175321 PMCID: PMC10179750 DOI: 10.3390/molecules28093911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 04/28/2023] [Accepted: 05/03/2023] [Indexed: 05/15/2023] Open
Abstract
This work investigated the hydrophobic flocculation of cassiterite using four alkyl hydroxamic acids with varying carbon chain lengths, i.e., hexyl hydroxamate (C6), octyl hydroxamate (C8), decyl hydroxamate (C10) and dodecyl hydroxamate (C12), as collectors. Microflotation tests were performed to investigate the flotation behaviour of cassiterite in the presence of the four alkyl hydroxamic acids. Focused beam reflectance measurement (FBRM) and a particle video microscope (PVM) were used to analyse and monitor the real-time evolution of the particle size distribution of cassiterite and the images of flocs during flocculation. The extended DLVO theory interaction energies between the cassiterite particles were calculated on the basis of the measured contact angle and the zeta potential of cassiterite to determine the aggregation and dispersion behaviour of the cassiterite particles. The microflotation test results suggested that the floatability of cassiterite improved with the increase in the carbon chain length of hydroxamates. FBRM, PVM images and extended DLVO theory calculation results indicated that when C6 was used as the collector, the cassiterite particles could not form hydrophobic flocs because the total potential energy between them was repulsive. When C8, C10 and C12 were used as collectors, the energy barrier amongst particles decreased with increasing hydroxamate concentration. The lowest concentrations of C8, C10 and C12 that could cause the hydrophobic aggregation of cassiterite were approximately 1 × 10-3, 1 × 10-4 and 2 × 10-5 mol/L, respectively. The aggregation growth rate and apparent floc size increased with an increasing collector concentration. Hydroxamic acid with a longer carbon chain could induce the cassiterite particles to form larger flocs at a lower concentration in a shorter time.
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Affiliation(s)
- Saizhen Jin
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Qing Shi
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Leming Ou
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
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Wan H, Hu X, Qu J, Zhang C, Xue J, Wang S, Yang W, Bu X. A new insight into the inhibition mechanism of calcium ion on low-rank coal flotation. SEP SCI TECHNOL 2023. [DOI: 10.1080/01496395.2023.2198103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
Affiliation(s)
- He Wan
- School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an, China
| | - Xianglin Hu
- School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an, China
| | - Juanping Qu
- Oulu Mining School, University of Oulu, Oulu, Finland
| | - Chonghui Zhang
- School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an, China
| | - Jiwei Xue
- School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an, China
| | - Sen Wang
- School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an, China
| | - Wei Yang
- School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an, China
| | - Xianzhong Bu
- School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an, China
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Wang F, Zhang L, Zhang D, Wu X, Deng S. Binding of Anionic Polyacrylamide with Amidase and Laccase under 298, 303, and 308 K: Docking and Molecular Dynamics Simulation Studies Combined with Experiments. ACS OMEGA 2023; 8:10040-10050. [PMID: 36969392 PMCID: PMC10034835 DOI: 10.1021/acsomega.2c07380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
Amidase and laccase play a key role in the degradation process of anionic polyacrylamide (HPAM). However, the largest challenge of HPAM enzymatic degradation is whether the enzyme can bind with a substrate for a period of time. Here, the most suitable complexes, namely, Rh Amidase-HPAM-2 and Bacillus subtilis (B. subtilis) laccase-HPAM-3, were obtained by docking, and they were carried out for molecular dynamics simulation (MDS) under 298, 303, and 308 K. MDS result analysis showed that Rh Amidase-HPAM-2 was the most stable at 298 K mainly due to a salt bridge and a hydrogen bond, and B. subtilis laccase-HPAM-3 was the most stable at 298 K mainly due to two electrostatic and hydrogen bonds. The LYS96 in Rh Amidase-HPAM-2 and LYS135 in B. subtilis laccase-HPAM-3 had been the most important in their binding process. The binding of Rh Amidase-HPAM-2 and B. subtilis laccase-HPAM-3 was optimal at 303 and 298 K, respectively. HPAM was degraded by mixed bacteria, and the optimal conditions were determined to be 308 K, initial pH = 7, and an inoculated dosage of 2 mL. Under these conditions, the degradation ratio reached 39.24%. The effect of parameters on the HPAM degradation ratio followed a decreasing order of temperature > initial pH > inoculated dosage. The HPAM codegradation mechanism was supposed by mixed bacteria according to test data. The mixed bacteria secreted both amidase and laccase, and they interacted jointly with HPAM. These results lay a theoretical foundation to design and modify the enzyme through mutation experiments in the future.
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Affiliation(s)
- Fanglue Wang
- School
of Bioengineering, Huainan Normal University, Huainan 232038, China
| | - Liwen Zhang
- School
of Mechanical and Electrical Engineering, Huainan Normal University, Huainan 232038, China
| | - Dongchen Zhang
- School
of Materials Science and Engineering, Anhui
University of Science and Technology, Huainan 232001, China
| | - Xuefeng Wu
- School
of Food and Bioengineering, Hefei University
of Technology, Hefei 230009, China
| | - Shengsong Deng
- School
of Food and Bioengineering, Hefei University
of Technology, Hefei 230009, China
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Chen J, Zhao K, Liu L, Gao Y, Zheng L, Liu M. Modified kaolin hydrogel for Cu 2+ adsorption. E-POLYMERS 2022. [DOI: 10.1515/epoly-2022-0085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Abstract
Removal of Cu2+ ions from contaminated water is an important but challenging task. This study reports the synthesis of a composite hydrogel from two natural polysaccharides, namely, sodium alginate and chitosan, using inexpensive kaolin as a raw material and polyacrylamide as a modifier. The hydrogel had a high adsorption capacity and selectivity for Cu2+. The composite hydrogel was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. The pseudo-second-order kinetic model was the most suitable model for the kinetic results, and the Langmuir isotherm model was the most representative of the sorption system. The results revealed that the adsorption process was mainly controlled by chemisorption. The maximum adsorption capacity of the adsorbent was 106.4 mg·g−1. Therefore, this study presents a new perspective on the application of composite hydrogels as Cu2+ adsorbents.
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Affiliation(s)
- Jin Chen
- College of Material Science and Engineering, Xi’an University of Science and Technology , Xi’an 710054 , China
| | - Kun Zhao
- College of Material Science and Engineering, Xi’an University of Science and Technology , Xi’an 710054 , China
| | - Lu Liu
- College of Material Science and Engineering, Xi’an University of Science and Technology , Xi’an 710054 , China
| | - Yuyu Gao
- College of Material Science and Engineering, Xi’an University of Science and Technology , Xi’an 710054 , China
| | - Lu Zheng
- College of Material Science and Engineering, Xi’an University of Science and Technology , Xi’an 710054 , China
| | - Min Liu
- College of Material Science and Engineering, Xi’an University of Science and Technology , Xi’an 710054 , China
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Effective flotation separation of malachite from quartz with a selective collector: Collection ability, separation performance and adsorption mechanism. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Improving the low-rank coal flotation performance using a novel collector prepared by hot melting of plastic waste into diesel. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Liu D, Peng Y. Foaming and aggregation behaviours of polyethylene oxide and polyacrylamide in inhibiting mechanical entrainment of kaolinite in flotation using saline water. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Zeng H, Tang H, Sun W, Wang L. Strengthening Solid–liquid Separation of Bauxite Residue through the Synergy of Charge Neutralization and Flocculation. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120296] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Huang H, Yang Q, Zhang L, Huang C, Liang Y. Polyacrylamide modified kaolin enhances adsorption of sodium alginate/carboxymethyl chitosan hydrogel beads for copper ions. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.02.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Yang B, Yin WZ, Yao J, Zhu ZL, Sun HR, Chen KQ, Wang LY. Differential adsorption of a high-performance collector at solid–liquid interface for the selective flotation of hematite from quartz. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116828] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Yang B, Yin W, Yao J, Zhu Z, Sun H, Chen K, Cao S. Selective collection and differential adsorption of pentaethoxylated laurylamine for the flotation recovery of magnesite from quartz. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126991] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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