Conjugated microporous poly(aniline)s for removal of low-concentration formaldehyde

Jin, Zhu; Lou, Xiaoyu; Wang, Yubing; Xiong, Zhuo; Chen, Jie; Yan, Wei

doi:10.1016/j.ces.2021.117119

Cited by 19 publications

(13 citation statements)

References 37 publications

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“…To investigate the adsorption mechanism of the CF-AST for UO 2 2+ , the XPS and FTIR analyses were performed. As shown in Figure b,e, the XPS full spectrum of the CF-AST shows four peaks located at about 284.9, 398.4, 531.7, and 130.6 eV, corresponding to C 1s, N 1s, O 1s, and P 2p, respectively. , After the adsorption of UO 2 2+ , a new characteristic peak at 382 eV (i.e., U 4f) appears, which indicates the insertion of UO 2 2+ ions . The analysis of high-resolution N 1s and O 1s XPS spectra was further carried out to clarify the adsorption of UO 2 2+ on CF-AST .…”

Section: Resultsmentioning

confidence: 92%

Phosphate-Functionalized Fibrous Adsorbent for Effectively Extracting Uranium from Seawater

Lin

Chen

et al. 2022

Ind. Eng. Chem. Res.

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Uranium is a basic and strategic resource related to national development and security. The uranium resources contained in the ocean are thousands of times that in the land, up to about 4.5 billion tons. However, it is still a severe challenge for the extraction of uranium from seawater as it contains trace amounts of uranium and a large number of cations. Herein, a new uranium extraction material, phosphate-functionalized collagen fibers, was prepared by a “covalent cross-linking” method by grafting the phosphate functional groups onto the surface of collagen fibers (CF) with a multihierarchy structure and multiple functional groups. The special structure of CF makes the adsorbent exhibit multistage kinetics and is controlled by chemisorption and layer diffusion. Through the introduction of amino and phosphoric acid functional groups, collagen fiber-alendronate sodium trihydrate (CF-AST) exhibits high-efficiency adsorption for uranium with the maximum adsorption reaching 277.78 mg g–1. In the extraction test from the East China Sea, CF-AST displayed a total uranium extraction mass of 29.61 μg after processing 10 L of seawater with an extraction rate of 89.69%. This adsorbent has shown superiorities in selectivity, kinetics, capacity, and reproducibility of uranium separation and enrichment from seawater, which is an economically viable and industrially scalable realistic uranium extraction material.

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Section: Resultsmentioning

confidence: 92%

Phosphate-Functionalized Fibrous Adsorbent for Effectively Extracting Uranium from Seawater

Lin

Chen

et al. 2022

Ind. Eng. Chem. Res.

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“…20,27 The acquired CMPA-M-2 showed very similar macroscopic properties, that is, the color, appearance, gelation degree, and so forth, with undeveloped CMPAs with a high yield of 99.2% and was totally insoluble in organic solvents, indicating a high polymerization degree of these linkers in CMPA-M-2. 20,28 The FT-IR spectra results were studied and are shown in Figure 1a, with the presence of characteristic peaks assigned to the functional groups on the core and linkers (Figure S9), but the absence of the peaks of C-Br at 710, 1004, and 1070 cm −1 in the core and of −NH 2 at 3300−3400 cm −1 in the linkers. 20,29,30 Moreover, the solid-state (SS) 13 C NMR spectra of CMPA-M-2 depicted in Figure 1b showed the expected two identical resonances at 127 and 141 ppm (which could be ascribed to the unsubstituted phenyl carbons and substituted phenyl carbons, as calculated in Figure S10−12), further suggesting the successful polymerization of these monomers.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Porosity Design on Conjugated Microporous Poly(Aniline)S for Exceptional Mercury(II) Removal

Lou

Chen

Xiong

et al. 2021

ACS Appl. Mater. Interfaces

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The use of conjugated microporous polymers (CMPs) in practical wastewater treatment demands further design on the pore structure, otherwise their adsorption capacities toward heavy-metal ions were moderate. Here, we report a rational design approach, which produces hybrid molecular pores in conjugated microporous poly(aniline)s (CMPAs) for mercury removal. It is achieved through a delicate interval introduction of linkers with differential molecular lengths during polymerization, acquiring both diffusion channels and storage pores for radical enhancement of mass transfer and adsorption storage. The resulting CMPA-M featured a large adsorption capacity of 975 mg g–1 and rapid kinetics that could remove 94.8% of 50 mg g–1 of mercury(II) within a very short contact time of 48 s, with a promising initial adsorption rate h as high as 113 mg g–1 min–1, which was 2.54-fold larger in the adsorption capacity and 45.2-fold faster in the adsorption efficiency compared with the undeveloped CMPAs. More importantly, our CMPA-M-2, with robust stability and easy reusability, was able to scavenge over 99.9% of mercury(II) from the actual wastewater in a harsh condition with a very low pH of 0.77, extremely high salinity of 53,157 mg L–1, and complex impurities, featuring exceptional selectivity that allows us to extract and recycle a high purity of 99.1% of mercury from the wastewater. These outcomes demonstrate the unprecedented potential of CMPs for environmental remediation and real-world mercury extraction and present benchmarks for CMP-based mercury adsorbents.

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“…F: Contaminant adsorption rate per unit time and area (μg/ m 2 h).Q c : Amount of Chamber Ventilation (m 3 /h).A: Surface area of the sample (m 2 ). The sample's ventilation amount conversion value (Qeq) is converted into the ventilation amount by the amount of clean air introduced to achieve the same effect as the concentration reduction effect of building materials (Zhu et al, 2022). It is calculated as in Equation 5, and it means that it is constant regardless of the concentration of contaminants under the assumption that the surface concentration of the sample is 0 (Zong et al, 2021).…”

Section: Calculation Of Adsorption Rate Adsorption Speed Ventilation ...mentioning

confidence: 99%

Evaluating the adsorption performance of functional building material with HCHO remover

Jung

Alqassimi²,

Samanoudy³

2022

Front. Built Environ.

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Dubai Municipality is making significant efforts to reduce the concentration of chemical substances in major buildings via Green Building Regulations & Specifications. However, it has limitations to the problem because it simply regulates the indoor air concentration of some harmful substances from building materials. The functional building materials capable of adsorbing and decomposing indoor pollutants such as Formaldehyde (HCHO) and Volatile Organic Compounds (VOCs) are gradually spreading. This paper aims to evaluate the performance of functional building materials and analyze the effect of improving the indoor air environment. As a methodology, the investigation was done to research trends and standards for functional building standards. 20 L small chamber experiment was performed for wallpaper with 0%, 5%, 7%, 10%, and 15% of the ethylene urea (C5H10N2O3), HCHO remover. The result showed standard wallpaper’s adsorption rate on the seventh day was 6.21%. The formaldehyde remover adsorption rate for 7 days was 50.43% when formaldehyde remover was added at a 5 wt% (weight percentage); 60.21% when it was added at 7 wt%; 63.45% when it was added at 10 wt%; and 73.58% when it was added at 15 wt%. The adsorption rate on the seventh day with 7 wt%, 10 wt%, and 15 wt% HCHO remover showed a 60% or more (IS O 16000-24 standard). However, wallpaper with 15 wt%, displayed the highest value, was 5.736 μg/m2, which did not satisfy the IS O 16000-24 standard (6.000 μg/m2). It was statistically proven when the amount of the HCHO remover is increased; the adsorption performance is improved in proportion to the amount added. This study will serve as primary data to prepare UAE standards for the functional building materials with adsorption and decomposition performance of harmful chemicals, moisture absorption and moisture-proof performance, and antibacterial/anti-fungal performance.

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Conjugated microporous poly(aniline)s for removal of low-concentration formaldehyde

Cited by 19 publications

References 37 publications

Phosphate-Functionalized Fibrous Adsorbent for Effectively Extracting Uranium from Seawater

Phosphate-Functionalized Fibrous Adsorbent for Effectively Extracting Uranium from Seawater

Porosity Design on Conjugated Microporous Poly(Aniline)S for Exceptional Mercury(II) Removal

Evaluating the adsorption performance of functional building material with HCHO remover

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