Novel Polymer Sorbents with Imprinted Task-Specific Ionic Liquids for Metal Removal

In this paper, the potential of novel polymer sorbents with the imprinted IL-functional group for the removal of Cu(II), Cd(II), and Zn(II) from aqueous solutions was investigated by batch mode. The sorbents were fabricated by direct reaction of the prepared polymer matrix (poly(vinylbenzyl chloride-divinylbenzene), VBC, and poly(vinylbenzyl bromide-divinylbenzene), VBBr) with 1-(3- or 4-pyridyl)undecan-1-one and oxime of 1-(3- or 4-pyridyl)undecan-1-one. The Fourier Transform Infrared Spectroscopy (FT-IR), Raman Spectroscopy (Raman), Thermogravimetric Analysis (TG), Differential Scanning Calorimetry (DSC), and Scanning Electron Microscopy (SEM) techniques were used to show functionality and stability of the sorbents. The materials were also characterized by contact-angle goniometry, X-rayphotoelectron spectroscopy (XPS), and Zeta potential analysis. The removal of Cd(II), Cu(II), and Zn(II) was monitored and optimized under the influence of several operational controlling conditions and factors such as pH, shaking time, temperature, initial metal ions concentration, and counter-ions at the functional group. The results obtained confirmed the very high potential of the sorbents; however, the properties depend on the structure of the functional group. The tested sorbents showed fast kinetics, significant capacity at 25 °C (84 mg/g for the Zn(II) sorption with VBC-Ox4.10, 63 mg/g for the Cd(II) sorption with VBBr-Ox3.10, and 69 mg/g for the Cu(II) sorption with VBC-K3.10), and temperature dependence (even 100% increase in capacity values at 45 °C). The selected sorbent can be regenerated without a significant decrease in the metal removal efficiency

Le complexe du palais royal du Mali

The excavations at the site of Niani have shown the existence of three big Carbon 14 dated sequences : 1) 6th-9th centuries A.D. ; 2) 10th-13th centuries A.D. ; 3) 14th-17th centuries A.D. Buildings of banco appear during the second sequence and the population of the site increases considerably as well as production in agriculture and iron. As regards the third sequence, the author believes that the excavations have revealed remains of buildings ordered in the 14th century by Mansa Musa and described by Ibn Battüta. They are situated in the royal quarter, created at the latest at the end of the 13th century and occupying about 5 hectares. The author describes the architectural discoveries and compares them with descriptions from Arab sources. Among them is a mosque and the traces of a room surmonted by a cupola. Finally the author analyses the probable development of Niani from the 14th to the 16th century. that the excavations have revealed remains of buildings ordered in the 14th century by Mansa Musa and described by Ibn Battüta. They are situated in the royal quarter, created at the latest at the end of the 13th century and occupying about 5 hectares. The author describes the architectural discoveries and compares them with descriptions from Arab sources. Among them is a mosque and the traces of a room surmonted by a cupola. Finally the author analyses the probable development of Niani from the 14th to the 16th century.Les fouilles sur le site de Niani ont permis d’établir l’existence de trois grandes séquences datées au 14C : 1) VIe-IXe s. ap. J.-C. ; 2) Xe-XIIIe s. ap. J.-C. ; 3) XIVe-XVIIe s. Les constructions de banco apparaissent durant la deuxième séquence et le peuplement de l’agglomération augmente fortement, ainsi que les activités de production (agriculture-fer). Pour ce qui est de la 3e séquence, l’auteur pense que les fouilles ont permis de retrouver les vestiges des constructions demandées au XIVe siècle par Mansa Mousa et que décrit Ibn Baţţūţa dans le quartier royal créé, probablement au plus tard à la fin du XIIIe siècle, et qui occupait environ 5 hectares. L’auteur décrit les découvertes architecturales effectuées et les compare aux descriptions fournies par les sources arabes ; parmi ces découvertes : une mosquée et les traces d’une pièce recouverte d’une coupole. L’auteur étudie, enfin, l’évolution probable de Niani, du XIVe au XVIe siècles.Filipowiak Władysław. Le complexe du palais royal du Mali. In: 2000 ans d’histoire africaine. Le sol, la parole et l’écrit. Mélanges en hommage à Raymond Mauny. Tome I. Paris : Société française d'histoire d'outre-mer, 1981. pp. 71-89. (Bibliothèque d'histoire d'outre-mer. Études, 5-6-1

On the margins of the search for Quarjat as-Saqaliba - early medieval pottery from the emirate of Nekor

Emirat Nekor istniał w VIII–XI wieku n.e. w górach Rif, na obszarze dzisiejszego północnego Maroka. Na przełomie IX i X wieku na dworze władcy emiratu doszło do buntu jego przybocznej gwardii składającej się ze słowiańskich niewolników, którzy schronili się w Qarjat as-Saqaliba, czyli wsi Słowian. W 2016 roku powstała polska grupa badawcza, która obrała za cel odszukanie pozostałości tego miejsca. Jednym ze źródeł, które będą pomocne w tym zamierzeniu, jest ceramika. W artykule tym autorzy przedstawiają stan badań nad ceramiką z obszaru emiratu Nekor, wskazując na możliwe słowiańskie inspiracje w ornamentyce naczyń ręcznie lepionych. Głównym źródłem są zabytki pozyskane podczas badań stolicy Nekor, przedstawione zostały również wyniki badań z innych stanowisk z obszaru emiratu. Analiza ceramiki wyraźnie wskazuje, że miał on silne powiązania we wczesnym średniowieczu z Andaluzją. Problemem natomiast jest brak datowania metodami bezwzględnymi zestawów naczyń.The emirate of Nekor existed in the VIII–XI century A.D. in the Rif mountains, in the area of today's northern Morocco. At the turn of the ninth and tenth century at the court of the ruler of the emirate a rebellion broke, consisting his personal guard of Slavic slaves who took refuge in Qarjat as-Saqaliba, the village of Slavs. A polish research group has been established in 2016, which has set the goal of finding the remains of that place. One of the sources that will be helpful in this intention is ceramics. This article presents the status of research on ceramics from the emirate Nekor, indicating a possible Slavic inspiration in ornamentation of handmade wares. The main collection of artifacts were obtained during excavation of the Nekor capital; the results of studies from other sites in the area of the emirate are presented. Analysis of ceramics clearly indicates that emirate had strong ties in the early Middle Ages Andalusia. The problem, however, is the lack of absolute dates for the pottery collections

Poly(vinylbenzyl Pyridinium Salts) as Novel Sorbents for Hazardous Metals Ions Removal

Novel efficient complexing resins—poly(vinylbenzyl pyridinium salts) fabricated through poly(vinylbenzyl halogene-co-divinylbenzene) quaternization of N-decyloxy-1-(pyridin-3-yl)ethaneimine and N-decyloxy-1-(pyridin-4-yl)ethaneimine—were tested as adsorbents of Pb(II), Cd(II), Cu(II), Zn(II), and Ni(II) from aqueous solutions. The structure of these materials was established by 13C CP-MAS NMR, X-ray photoelectron spectroscopy, elemental analysis, and Fourier transform infrared spectroscopy, as well as thermogravimetric and differential thermal analyses. The textural properties were determined using scanning electron microscopy and low-temperature N2 sorption. Based on the conducted sorption studies, it was shown that the uptake behavior of the metal ions towards novel resins depended on the type of functionalities, contact time, pH, metal concentrations, and the resin dosage. The Langmuir model was investigated to be the best one for fitting isothermal adsorption equilibrium data, and the corresponding adsorption capacities were predicted to be 296.4, 201.8, 83.8, 38.1, and 39.3 mg/g for Pb(II), Zn(II), Cd(II), Cu(II), and Ni(II), respectively. These results confirmed that owing to the presence of the functional pyridinium groups, the resins demonstrated proficient metal ion removal capacities. Furthermore, VBBr-D4EI could be successfully used for the selective uptake of Pb(II) from wastewater. It was also shown that the novel resins can be regenerated without significant loss of their sorption capacity

Following tracks of the Slavic slaves’ rebellion in Africa. Report on the interdisciplinary expedition to Morocco

In 2016, a research team comprised of scientists from the University of Szczecin, the University of Adam Mickiewicz in Poznań and the Institute of Archaeology and Ethnology of the Polish Academy of Sciences made a reconnaissance expedition to Morocco. The team’s technology partner is Pixel Legend. The aim of the team is to locate and to examine a Slavs’ village from the turn of the 9th and 10th centuries which was mentioned in Al-Bakri’s work. The expedition lasted 29 days and travelled over 10,000 km. It resulted in acquiring literature, scientific contacts, field experience and a collection of traditional pottery from northern Morocco. The effects of the expedition were presented in the media, at conferences and in scientific journals

Early Slavonic Settlements and Navigation at the Mouth of the Odra River

From the 12th International Radiocarbon Conference held in Trondheim, June 24-28, 1985.An attempt is presented to establish an absolute chronology of early Slavonic habitation in the region of the mouth of the Odra River up to the Baltic and to find associations with a series of stave boats and dugouts of different levels of technology and navigation. The methodology of the research project is presented and some conclusions of a general nature are drawn from the results already obtained.This material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries.The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform February 202

Radiocarbon and Dendrochronological Dating of Logboats from Poland

From the 17th International Radiocarbon Conference held in Jerusalem, Israel, June 18-23, 2000.The earliest dating of samples taken from logboats found in the area of Poland was done at the Gliwice Radiocarbon Laboratory in the late 1970s and early 1980s. After a 10-year break, the study of their chronology was renewed. The 14C dates (56) include all previously published and new, unpublished results obtained during last several years. Here, we discuss and provide probabilistic interpretation of the calendar age of the dated boats. The calibration of 14C dates was done with the OxCal program for dates less than 300 BP, and with the GdCALIB program for all remaining dates. In distribution of calibrated dates we find a lack of samples between the ages of around 800 BC and 300 AD. This result is surprising and differs from results observed for Central Europe. The remaining age ranges, with high frequency of dates, are in good coincidence with similar periods obtained for Central Europe. Tree-ring dating of oak logboats was carried out on 60 growth sequences, dated against standard chronologies defined for the area of Poland. The results of 14C dating and tree-ring analyses give consistent chronologies.The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform February 202

Novel Mesoporous Organosilicas with Task Ionic Liquids: Properties and High Adsorption Performance for Pb(II)

Removal of toxic contaminants such as Pb(II) from waste solutions is environmentally requested. Therefore, in this paper, for potential novel sorbents, mesoporous ionic liquid-functionalized silicas were synthesized and tested for the removal of Pb(II) from aqueous solutions. The successful synthesis of the adsorbents was proved by nuclear magnetic resonance (29Si and 13C NMR), Fourier transform infrared spectroscopy (FTIR), and elemental analysis. The structural and textural properties were determined using scanning electron microscopy (SEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (TEM), and low-temperature N2 sorption, and the result showed that the applied procedure made it possible to obtain highly ordered particles with a two-dimensional mesostructure. The effects of several parameters including initial pH, contact time, adsorption temperature, and Pb(II) concentration were studied in detail and were discussed to evaluate the adsorption properties of the fabricated materials towards Pb(II). The obtained results confirmed a very high potential of the sorbents; however, the adsorption properties depend on the structure and amounts of the functional group onto fabricated materials. The sample ILS-Ox3-40 showed fast kinetics (equilibrium reached within 10 min) and capacity of 172 mg/g, and that makes it a promising sorbent for the cleanup of water contaminated by lead. It was also indicated that, regardless on structure of the tested materials, the Pb(II) removal was spontaneous and exothermic. The fabricated mesoporous silicas exhibited that they were easy to regenerate and had excellent reusability