Selective adsorption and recovery of precious metal ions from water and metallurgical slag by polymer brush graphene–polyurethane composite

Xue, Dingshuai; Li, Ting; Liu, Yanhong; Yang, Yue‐Heng; Zhang, Yuxing; Cui, Jun; Guo, DongBen

doi:10.1016/j.reactfunctpolym.2018.12.026

Cited by 27 publications

(5 citation statements)

References 97 publications

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“…The reaction torque is proportional to the viscosity of the material, which depends on the molecular weight and chain structure of the polymer 23 . Figure 1 shows the torque evolution of the modification reaction for all samples.…”

Section: Resultsmentioning

confidence: 99%

“…Xu et al modified PA6 with 1,1‐isophthaloyl‐bis‐caprolactam (IBC), 2,2‐bis(2‐oxazoline) (BOZ), epoxy‐type chain extender KL‐E4370, and IBC composite BOZ, and performed batch foaming 23–25 . The results showed that PA6 melt modified with KL‐E4370 had the highest strength, widest foaming window, and largest expansion ratio.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chain extension of thermoplastic polyamide elastomer and its foaming performance

Wen

Xin

et al. 2022

J of Applied Polymer Sci

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chain extension of thermoplastic polyamide elastomer and its foaming performance

Wen

Xin

et al. 2022

J of Applied Polymer Sci

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“…Therefore, it is possible that the mechanical properties of the nanofiber membranes prepared by PU can be improved compared to other membrane materials. In recent years, there has been an increasing amount of literature related to the application of PU foam-based adsorbents for oil-water separation [20][21][22], heavy metals [23,24] and dye [25,26] removal, which shows that this material has great potential for pollutant removal. As adsorbents, the external functional groups on PU play a vital role in adsorption, influencing the adsorption mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Different Adsorption Behaviors and Mechanisms of Anionic Azo Dyes on Polydopamine–Polyethyleneimine Modified Thermoplastic Polyurethane Nanofiber Membranes

Sun

Zhou

Jiang

et al. 2022

Water

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Considering the notable mechanical properties of thermoplastic polyurethane (TPU), polydopamine–polyethyleneimine (PEI) -modified TPU nanofiber membranes (PDA/PEI-TPU NFMs) have been developed successfully for removal of anionic azo dyes. The adsorption capacity of PDA/PEI-TPU NFMs was evaluated using three anionic dyes: congo red (CR), sunset yellow (SY), and methyl orange (MO). Interestingly, it exhibited different adsorption behaviors and mechanisms of CR on PDA/PEI-TPU NFMs compared with SY and MO. With the decrease in pH, leading to more positive charges on the PDA/PEI-TPU NFMs, the adsorption capacity of SY and MO increased, indicating electrostatic interaction as a main mechanism for SY and MO adsorption. However, wide pH range adaptability and superior adsorption have been observed during the CR adsorption process compared to SY and MO, suggesting a synergistic effect of hydrogen bonding and electrostatic interaction, likely as a critical factor. The adsorption kinetics revealed that chemical interactions predominate in the CR adsorption process, and multiple stages control the adsorption process at the same time. According to the Langmuir model, the maximum adsorption capacity of CR, SY and MO were reached 263, 17 and 23 mg/g, respectively. After six iterations of adsorption–desorption, the adsorption performance of the PDA/PEI-TPU NFMs did not decrease significantly, which indicated that the PDA/PEI-TPU NFMs have a potential application for the removal of CR molecules by adsorption from wastewater.

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“…In modern manufacturing, the flammability hazard of combustible polymer materials has always been the serious concerns in most cases. 1,2 As one of the most widely used foam materials, flexible polyurethane foam (FPUF) possesses a wide range of industrial application in seating cushion, 3 upholstered furniture, 4 vibration-proof packaging, 5 heat insulation, 6 oil/heavy metal adsorption 7,8 and other fields. 9,10 However, the intrinsic flammability polyurethane components and porous feature make pristine FPUF easy to be ignite, and hard to self-extinguish before burning out.…”

Section: Introductionmentioning

confidence: 99%

Carbonization‐dominated synergistic behaviors of ammonium hypophosphite/EG composite in improving flame retardancy of flexible polyurethane foam

Qiu

Qian

et al. 2022

Polymers for Advanced Techs

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Developing flexible polyurethane foam (FPUF) with good anti‐ignition and self‐extinguishing performance is the fundamental way to prevent fire hazards in application. A binary composite system containing ammonium hypophosphite (NHP) and expandable graphite (EG) was applied to prepare flame‐retardant FPUF. The co‐action of NHP and EG exhibited high‐efficiency synergistic effect in improving the anti‐ignition, self‐extinguishing, and carbonization performance of FPUF. The analysis of micromorphology, element retention and chemical structure character on charring residue, reveals the physical–chemical synergistic carbonization mechanism of NHP/EG composite. The real‐time tracing on thermal‐decomposition volatiles, discloses the behaviors of NHP/EG composite in suppressing volatile fuel supply and toxic fume production. With an addition of 11 wt.% NHP and 7 wt.% EG, 11NHP/7EG achieved a limited oxygen index value of 30.3%, passed horizontal burning class HF‐1, and retained 55.6 wt.% charring residue. The peak of heat release rate and total heat release of 11NHP/7EG were both reduced by more than 50%, compared with that of pristine FPUF. The synergistic flame‐retardant mechanism of NHP/EG composite provides a valuable reference for high‐performance flame‐retardant FPUF manufacturing.

show abstract

Selective adsorption and recovery of precious metal ions from water and metallurgical slag by polymer brush graphene–polyurethane composite

Cited by 27 publications

References 97 publications

Chain extension of thermoplastic polyamide elastomer and its foaming performance

Chain extension of thermoplastic polyamide elastomer and its foaming performance

Different Adsorption Behaviors and Mechanisms of Anionic Azo Dyes on Polydopamine–Polyethyleneimine Modified Thermoplastic Polyurethane Nanofiber Membranes

Carbonization‐dominated synergistic behaviors of ammonium hypophosphite/EG composite in improving flame retardancy of flexible polyurethane foam

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