APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Bao Ren,Mingkang Xu,Jiaqiang Zhu,Zichang Xia,Chunfu Liu,Fanfei Min
The hydration characteristics of fine particles significantly influence the settling and dewatering of tailings. However, the current limited understanding of the micro-mechanisms governing the interactions between hydrophobic flocculants and fine particles hinders the optimization of tailings treatment technical. Through a combination of MD simulations, flocculation settling, and adsorption capacity analysis, the hydrophobic adsorption mechanism of P(AM-MAPTAC-TEMAc6) at the kaolinite/water interface was elucidated. Results suggested that hydrogen bonding and non-bond interactions synergistically drive the adsorption of P(AM-MAPTAC-TEMAc6) onto the kaolinite surface. As the mass concentration of P(AM-MAPTAC-TEMAc6) increased, the hydrophobic and associative interactions between the molecular chains enhanced the adsorption amount on kaolinite particles, leading to a notable decrease in the solution residual amount and the supernatant turbidity. P(AM-MAPTAC-TEMAc6) improved the dewatering performance of concentrated tailings by reducing the hydration film density on kaolinite surfaces, thus decreasing the compression layer thickness. The fluorocarbon side chains of P(AM-MAPTAC-TEMAc6) enhance the hydrophobic adsorption capacity of cationic side chains in the surface water region. Simultaneously, the associative interactions of the molecular chains in the bulk water region promote enhanced diffusion and migration, thereby strengthening the bridging mechanism between P(AM-MAPTAC-TEMAc6) and kaolinite particles, ultimately improving the settling and dewatering efficiency of the suspensions.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2024
·Vol. 35
·期 1
·e6277
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IF 3.1
Anqi Ming,Xiaoxiao Li,Jun Sun,Yanyan Liu,Xingyou Tian,Hua Wang,Lin Chen,Yuxiang Cao,Yun Yuan
The cationic water-soluble polymers, which are widely used in many areas such as papermaking and separation process, are typically synthesized through polymerization of cationic monomers represented by quaternary ammonium salt. In this work, the polymerization reaction kinetics of three typical quaternary ammonium salt cationic monomers including acryloyl oxygen ethyl trimethyl ammonium chloride (DAC), methyl acryloyl oxygen ethyl trimethyl ammonium chloride (DMC), and methyl acrylamide propyl trimethyl ammonium chloride (MAPTAC) was examined by using the dilatometer method. The results showed that the polymerization rate of all three monomers increased with the increase of initiation temperature, monomer concentration, and initiator concentration. Under the same conditions, the polymerization activity of the three monomers followed the order: DAC > DMC > MAPTAC. The activation energies for the polymerization reaction under the specified conditions were E aDAC = 138.97 kJ/mol, E aDMC = 141.24 kJ/mol, and E aMAPTAC = 226.97 kJ/mol, respectively. The polymerization rate equations were R pDAC = k 1 [ M ] 4.25 [ I ] 0.51 , R pDMC = k 2 [ M ] 3.77 [ I ] 0.50 , and R pMAPTAC = k 3 [ M ] 3.30 [ I ] 0.49 . The polymerization activity of the monomers may be influenced by electronic effects and steric hindrance of the monomer structure. This work has provided a theoretical and experimental foundation for the actual work of structural design and preparation of cationic water-soluble polymers.
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
Materials Today Communications
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2025
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IF 4.5
Shangyu Hu,Bao Ren,Fanfei Min,Mingkang Xu,Xiaowei Huang,Jiaqiang Zhu
The intractable mineral processing wastewater poses severe challenges to ecological environments and resource utilization. Developing novel flocculants for efficient treatment of complex mineral processing wastewater is an urgent problem that demands immediate resolution. In this study, a novel cationic polyacrylamide flocculant with hydrophobic modification, designated P(AM-MAPTAC-TEMAC 6 ), was synthesized via low-pressure ultraviolet (UV) -initiated polymerization using methacrylamido propyl trimethyl ammonium chloride (MAPTAC), acrylamide (AM), and perfluorohexyl ethyl methacrylate (TEMAC 6 ) as comonomers, with irgacure 2959 as the photo-initiator. The synthesis conditions were systematically optimized through single-factor experiments, culminating in optimal parameters: total monomer concentration of 35%, TEMAC 6 content of 10 wt%, photo-initiator dosage of 0.3 wt%, surfactant dosage of 0.8 wt%, UV irradiation time of 4 h, and urea dosage of 0.3 wt%. The successful synthesis of the copolymer was confirmed by ¹H nuclear magnetic resonance (¹H NMR) and Fourier transform infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) revealed a well-developed porous structure, while thermogravimetric analysis (TG/DTG) demonstrated enhanced thermal stability. Flocculation and dewatering tests showed that P(AM-MAPTAC-TEMAC 6 ) exhibited superior turbidity removal and moisture reduction compared to three commercial flocculants in kaolinite, quartz, and montmorillonite suspensions. At a dosage of 50 g/t, residual turbidity values reached 99.63 NTU, 110.5 NTU, and 63.35 NTU, respectively, while the increments in moisture content of filter cakes consistently lower than that achieved by three commercial flocculants.
研究领域:
环境工程
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高分子化学
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矿物加工
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水处理技术
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胶体与界面化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2021
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IF 5.565
Yanqing Zhou,Yili Wang,Shuoxun Dong,Haotian Hao,Junyi Li,Chenyang Liu,Xiaolin Li,Yao Tong
Cationic hydrogels have received great attention to control eutrophication and recycle phosphate. In this study, a type of La(OH) 3 loaded magnetic MAPTAC-based cationic hydrogel (La(OH) 3 @MMCH) was developed as a potential adsorbent for enhanced phosphate removal from aqueous environment. La(OH) 3 @MMCH exhibited high adsorption capacity of 105.72±5.99 mg P/g, and reached equilibrium within 2 hr. La(OH) 3 @MMCH could perform effectively in a wide pH range from 3.0 to 9.0 and in the presence of coexisting ions (including SO 4 2− , Cl − , NO 3 − , HCO 3 − , SiO 4 4− and HA). The adsorption-desorption experiment indicated that La(OH) 3 @MMCH could be easily regenerated by using NaOH-NaCl as the desorption agent, and 73.3% adsorption capacity remained after five cycles. Moreover, La(OH) 3 @MMCH was employed to treat surface water with phosphate concentration of 1.90 mg/L and showed great removal efficiency of 95.21%. Actually, MMCH showed high surface charge density of 34.38-59.38 meq/kg in the pH range from 3.0 to 11.0 and great swelling ratio of 3014.57% within 24 h, indicating that MMCH could produce the enhanced Donnan membrane effect to pre-permeate phosphate. Furthermore, the bifunctional structure of La(OH) 3 @MMCH enabled it to capture phosphate through electrostatic attraction and ligand exchange . All the results prove that La(OH) 3 @MMCH is a promising adsorbent for eutrophication control and phosphate recovery.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
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2025
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IF 6.3
Yazhou Duan,Weihan Tao,Yinchun Fang,Xianfeng Wang
Textiles-based wearable sensors with colorimetric sensing can transform external stimuli to visible color changes, which are ideal for the development of low-cost wearable sensors. Among them, textile-based water-response structural color colorimetric sensors have received wide attention for their pollution-free and eco-friendly characteristics. In this research, poly (styryl-methyl methacrylate-[3-(methylacrylamide) propyl] trimethyl ammonium chloride) (P(St/MMA/MAPTMA)) microspheres with hydrophilic quaternary ammonium salt groups were prepared, which were atomized and deposited on textile fabrics anticipating to prepare textile-based water response colorimetric sensors. P(St/MMA/MAPTMA) microspheres with different particle diameters were obtained by adjusting the mass ratios of the monomers, which were assembled on the fabrics to form different structural colors. These structural colors showed fast water response property to change color when they were wetted by water within 2 s. The P(St/MMA/MAPTMA) microspheres structural colors on the fabrics can return to their original structural colors after drying showing the reversible water responsiveness, which have the promising application prospect of water-response colorimetric sensors. Moreover, the antibacterial rates of these structural colors on fabrics were greater than 98 % showing excellent antibacterial properties. This research shows that this textile-based water-response structural color colorimetric sensors exhibit potential application prospects in the field of water content monitoring, such as the diapers for monitoring the amount of baby’s urine, or the clothing for monitoring the amount of human sweat.
研究领域:
材料科学
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传感器与传感技术
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可穿戴电子
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光子材料
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智能纺织品
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）