Abstract:Electroactive polypyrrole has been synthesized by oxidative polymerization of pyrrole using ferric chloride hexahydrate as oxidant in the presence of sodium dodecylbenzene sulfonate (SDBS), and used to remove radioactive cesium from aqueous solution. The SDBS‐doped polypyrrole (PPy/SDBS) adsorbent was characterized by Field emission scanning electron microscopy, X‐ray diffraction and Fourier transform infrared techniques. A rapid and efficient adsorption of 137Cs radionuclide with a maximum sorption capacity o… Show more
“…137 Cs and 90 Sr are considered as the main hazardous fission products in nuclear waste due to relatively long half-lives ( t 1/2 Cs = 30.17 years, and t 1/2 Sr = 28.80 years), the ability to emit high-energy β and γ radiation, high heat release, and strong biological toxicity. − For instance, 137 Cs and 90 Sr are the major sources of the release of radioactivity after the Fukushima Daiichi Nuclear Power Plant accident, which rapidly spread into the sea causing considerable concern. , Therefore, the safe storage and disposal of 137 Cs and 90 Sr are vitally important for the sake of environmental safety and human health as well as the development of nuclear industry. However, 137 Cs + and 90 Sr 2+ ions are highly soluble and easy to migrate in the water environments .…”
137 Cs + and 90 Sr 2+ are highly soluble, highly environmentally mobile, and strongly radiotoxic. Efficiently sequestering 137 Cs + and 90 Sr 2+ ions from aqueous solutions remains a serious challenge, especially from acidic environments because of the effects of protonation and poor stabilities of materials. Here, efficient removal of Cs + and Sr 2+ ions is achieved by a layered thiostannate, namely [(EtNH 3 ) 1.68 (Et 2 NH 2 ) 0.32 ]Sn 3 S 7 •0.68H 2 O (FJSM-SnS-4), which exhibits excellent acid−base and β and γ irradiation resistances. FJSM-SnS-4 possesses high maximum adsorption capacities and rapid kinetics for Cs + and Sr 2+ ions under neutral conditions. It can even capture Cs + ions under acidic conditions (e.g., pH 1.6 and 0.4). It is interesting that FJSM-SnS-4 has excellent selectivity for Sr 2+ ions in neutral environments, whereas it prefers capturing Cs + from 1 M HCl solutions with coexisting K + , Na + , Ca 2+ , Mg 2+ , and Sr 2+ ions. The Cs + and Sr 2+ adsorption mechanism has been revealed at the molecular level by single-crystal structural analysis coupled with XPS, EXAFS, and EA characterization, that is, ion exchange between Cs + and Sr 2+ ions and protonated organic amines in interlayer space owing to the flexibility of the current layered thiostannate framework and the strong affinity of the soft basic S 2− of the framework for Cs + and Sr 2+ ions.
“…137 Cs and 90 Sr are considered as the main hazardous fission products in nuclear waste due to relatively long half-lives ( t 1/2 Cs = 30.17 years, and t 1/2 Sr = 28.80 years), the ability to emit high-energy β and γ radiation, high heat release, and strong biological toxicity. − For instance, 137 Cs and 90 Sr are the major sources of the release of radioactivity after the Fukushima Daiichi Nuclear Power Plant accident, which rapidly spread into the sea causing considerable concern. , Therefore, the safe storage and disposal of 137 Cs and 90 Sr are vitally important for the sake of environmental safety and human health as well as the development of nuclear industry. However, 137 Cs + and 90 Sr 2+ ions are highly soluble and easy to migrate in the water environments .…”
137 Cs + and 90 Sr 2+ are highly soluble, highly environmentally mobile, and strongly radiotoxic. Efficiently sequestering 137 Cs + and 90 Sr 2+ ions from aqueous solutions remains a serious challenge, especially from acidic environments because of the effects of protonation and poor stabilities of materials. Here, efficient removal of Cs + and Sr 2+ ions is achieved by a layered thiostannate, namely [(EtNH 3 ) 1.68 (Et 2 NH 2 ) 0.32 ]Sn 3 S 7 •0.68H 2 O (FJSM-SnS-4), which exhibits excellent acid−base and β and γ irradiation resistances. FJSM-SnS-4 possesses high maximum adsorption capacities and rapid kinetics for Cs + and Sr 2+ ions under neutral conditions. It can even capture Cs + ions under acidic conditions (e.g., pH 1.6 and 0.4). It is interesting that FJSM-SnS-4 has excellent selectivity for Sr 2+ ions in neutral environments, whereas it prefers capturing Cs + from 1 M HCl solutions with coexisting K + , Na + , Ca 2+ , Mg 2+ , and Sr 2+ ions. The Cs + and Sr 2+ adsorption mechanism has been revealed at the molecular level by single-crystal structural analysis coupled with XPS, EXAFS, and EA characterization, that is, ion exchange between Cs + and Sr 2+ ions and protonated organic amines in interlayer space owing to the flexibility of the current layered thiostannate framework and the strong affinity of the soft basic S 2− of the framework for Cs + and Sr 2+ ions.
“…The broad peak of PEI was found to be at 3350 cm −1 for Nitrogen to Hydrogen stretching, 2980-2800 cm −1 for Carbon to Hydrogen stretching, 2100 cm −1 for Carbon to Nitrogen bending, 2008 cm −1 for Carbon to Hydrogen bending, and 1580 cm −1 for Nitrogen to Hydrogen bending (Carbon to Nitrogen stretching). When the Nitrogen to Hydrogen twisting of the PEI and the Carbon to Nitrogen stretching of the pyrrole ring are now shifted to 1440 cm −1 in the PPy-PEI composite, it is obviously showing the association between the amino-rich from polyethyleneimine and polypyrrole as well as the newly synthesized polypyrrole-polyethyleneimine nanoadsorbent with rich active groups of amine groups [19,21].…”
Section: Ftir Spectramentioning
confidence: 96%
“…This was caused by the polymer nano-hemicellulose composites of PPy-PEI decomposing, as well as the polymer nano-oligomeric adsorbents or unsaturated group breaking down under heat (thermal decomposition of PEI melting point at 500 • C). Less than 30% of the initial polymer's weight was left after the final stage's intense heat deterioration (500-800 • C) occurred, the sample's residual mass following thermal degradation of the Ppy-PEI, which reveals the type of oxidant (ammonium persulphate) utilized during synthesis [19,21,23,24].…”
“…Various conducting polymers such as polyaniline, polypyrrole, and their composites have gained substantial research interest from polymer-based adsorbents owing to their possible uses in adsorption of different heavy metal ions and dyes and electronic pollution from wastewater [8,18,19]. The simplicity of synthesis, regeneration, mechanical stability, and low cost of these conducting polymer-based adsorbents are further advantages [20,21]. According to one study, polypyrrole can remove chromium (84 percent) from an aqueous solution when the pH is alkaline [22].…”
This work successfully created a polypyrrole-polyethyleneimine (PPy-PEI) nano adsorbent for the elimination of the lead ion Pb2+ from an aqueous solution. An efficient conducting polymer-based adsorbent called as was created using ammonium persulfate (NH4)2S2O8 as an oxidant (PPy-PEI). The PEI hyper-branched polymer with terminal amino groups was added to the PPy adsorbent to offer heavy metals more effective chelating sites. Pb2+ removal from aqueous solution using polyethyleneimine micro adsorbent was successfully accomplished using a batch equilibrium technique (PPy-PEI). The generated water-insoluble polymer nanoadsorbent had enough nitrogen atoms; therefore, an effort was made to link PEI, a water-soluble PPy, with PPy, a conjugated polymer, for lead ion adsorption from an aqueous solution. The generated PPy-PEI nanoadsorbents were discovered to have average particle sizes of 18–34 nm and a Brunauer-Emmet-Teller surface area of 17 m2/g, respectively. The thermal behavior of the composites was investigated using thermo gravimetric and differential scanning calorimetric methods. The lead ion adsorption efficacy of pure polypyrrole was found to be 38%; however, a batch equilibrium technique employing nanoadsorbent revealed with the maximum adsorption capacity of 75.60 mg g−1. At pH 10 and 30 min of contact time at 50 °C, 0.2 g of adsorption was shown to be the ideal dosage. X-ray diffraction analysis, energy-dispersive ray spectroscopy, and Fourier transform infrared ray spectrum support the lead ion adsorption by PPy-PEI nanoadsorbents. The cauli-like structure was visible using field emission scanning electron microscopy. Studying the thermodynamic showed that the adsorption was endothermic as illustrated from the positive value of value of ΔH° is 1.439 kJ/mol which indicates that the uptake of Pb2+onto nanoadsorbent PPy-PEI could be attributed to a physical adsorption process. According to the values of ΔG°, the adsorption process was spontaneous at all selected temperatures. The positive value of ΔS° value (43.52 j/mol) suggested an increase in the randomness at the solid/solution interface during the adsorption process. The adsorption data meet the pseudo-second-order kinetic model and suited the Langumuir isothermal model effectively.
“…To date, great efforts have been devoted to the exploitation of separation processes for the removal of Cs + , and current approaches mainly include precipitation, , solvent extraction, ,,, and adsorption/ion exchange. − However, chemical precipitation will generate a large amount of radioactive solid waste that is difficult to separate from the water column. The solvent extraction method results in secondary removal due to the ingestion of volatile and toxic organic diluents and modifiers.…”
An anion double-walled metal–organic framework [Co2Li4(BTC)3(DMF)(H2O)·(CH3)2N]
n
(1) based on heterobimetallic Li+ and Co2+ ions was successfully constructed. Utilizing selective destruction
and formation of Co–O/Co–N bonds in the metal chains,
[Co2Li4(BTC)3(py)(H2O)·(CH3)2N]
n
(2) and [Co2Li4(BTC)3(pi)(H2O)·(CH3)2N]
n
(3) with the
same skeleton but distinct pore structures can be surprisingly obtained.
Additionally, compounds 2 and 3 can be transformed
into [Co2Li4(BTC)3(H2O)2·(CH3)2N]
n
(4) by soaking them in an ethanol solution.
This kind of single-crystal-to-single-crystal transformation successfully
regulates the pore structure of MOFs and enriches the diversity of
the pore wall on the premise of retaining the original framework.
Most impressively, compound 1 shows high adsorption capacity
for Cs+ cations and is a good candidate to selectively
accommodate Cs+ among the common alkali metal ions, which
is future identified by single-crystal X-ray diffraction and inductively
coupled plasma mass spectrometry (ICP-MS) test. Meanwhile, compound 1 can selectively adsorb methylene blue (MB) and crystal violet
(CV) molecules over Rhodamine B (RMB).
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