Polyaniline/Montmorillonite Nanocomposites Obtained by In Situ Intercalation and Oxidative Polymerization in Cationic Modified-Clay (Sodium, Copper and Iron)

Polyaniline/montmorillonite nanocomposites (PANI/M) were obtained by intercalation of aniline monomer into M modified with different cations and subsequent oxidative polymerization of the aniline. The modified-clay was prepared by ion exchange of sodium, copper and iron cations in the clay (Na–M, Cu–M and Fe–M respectively). Infrared spectroscopy confirms the electrostatic interaction between the oxidized PANI and the negatively charged surface of the clay. X-ray diffraction analysis provides structural information of the prepared materials. The nanocomposites were characterized by transmission electron microscopy and their thermal degradation was investigated by thermogravimetric analysis. The weight loss suggests that the PANI chains in the nanocomposites have higher thermal stability than pure PANI. The electrical conductivity of the nanocomposites increased between 12 and 24 times with respect to the pure M and this increase was dependent on the cation-modification. The electrochemical behavior of the polymers extracted from the nanocomposites was studied by cyclic voltammetry and a good electrochemical response was observed.

Algerian natural montmorillonites for arsenic(III) removal in aqueous solution

The adsorption of As(III) from aqueous solutions using naturally occurring and modified Algerian montmorillonites has been investigated as a function of contact time, pH, and temperature. Kinetic studies reveal that uptake of As(III) ions is rapid within the first 3 h, and it slows down thereafter. Equilibrium studies show that As(III) shows the highest affinity toward acidic montmorillonite even at very low concentration of arsenic. The kinetics of As(III) adsorption on all montmorillonites used is well described by a pseudo-second-order chemical reaction model, which indicates that the adsorption process of these species is likely to be chemisorption. Adsorption isotherms of As(III) fitted the Langmuir and Freundlich isotherm models well. The adsorption of As(III) is pH-dependent obtaining an optimal adsorption at pH 5. From the thermodynamic parameters, it is concluded that the process is exothermic, spontaneous, and favorable. The results suggest that M1, M2, and acidic-M2 could be used as low-cost and effective filtering materials for removal of arsenic from water.

Morocco, 1853 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: North Africa or Barbary : I Marocco, Society for the Diffusion of Useful Knowledge ; engraved by J. & C. Walker. This is map 1 of a 5 map set published by George Cox Jan. 1st, 1853. Scale [ca. 1:2,800,000]. Covers Morocco and portions of Algeria. The image inside the map neatline is georeferenced to the surface of the earth and fit to a modified 'Europe Lambert Conformal Conic' projection with a central meridian of 7 degrees West. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, aqueducts, cities, villages and other human settlements, trails, bedouin tribes, and more. Relief shown by hachures. Includes inset: Plan of the city of Marocco (Scale [ca. 1:32,000]). This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection as part of the Open Collections Program at Harvard University project: Islamic Heritage Project. Maps selected for the project represent a range of regions, originators, ground condition dates, scales, and purposes. The Islamic Heritage Project consists of over 100,000 digitized pages from Harvard's collections of Islamic manuscripts and published materials. Supported by Prince Alwaleed Bin Talal and developed in association with the Prince Alwaleed Bin Talal Islamic Studies Program at Harvard University.

Morocco, 1908 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Maroc, carte dessinée par R. de Flotte de Roquevaire. It was published by Maison Andriveau-Goujon, Henry Barrère Editeur in 1908. Scale 1:1,000,000. Covers Morocco and portions of Algeria. Map in French. The image inside the map neatline is georeferenced to the surface of the earth and fit to a modified 'Europe Lambert Conformal Conic' projection with a central meridian of 7 degrees West. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, cities and other human settlements, roads, ruins, territorial boundaries, shoreline features, and more. Relief shown by landforms and spot heights. Includes indexs and insets: Mazagan (Scale 1:20,000) -- Casa Blanca (Scale 1:20,000) -- Tanger (Scale 1:20,000) -- Safi (Scale 1:20,000) -- Larache (Scale 1:20,000) -- El-Qsar el-Kebir (Scale 1:20,000) -- Rabat (Scale 1:50,000) -- Taroudant (Scale 1:40,000) -- Mogador (Scale 1:20,000) -- Agadir Irir (Scale 1:20,000) -- Oujda (Scale 1:20,000) -- El-Aïoun Si Mellouk (Scale 1:10,000) -- Meknes (Scale 1:50,000) -- Fes (Scale 1:30,000) -- Figuig (Scale 1:200,000) -- Marrakech (Scale 1:60,000) -- Environs de Fes (Scale 1:100,000). This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection as part of the Open Collections Program at Harvard University project: Islamic Heritage Project. Maps selected for the project represent a range of regions, originators, ground condition dates, scales, and purposes. The Islamic Heritage Project consists of over 100,000 digitized pages from Harvard's collections of Islamic manuscripts and published materials. Supported by Prince Alwaleed Bin Talal and developed in association with the Prince Alwaleed Bin Talal Islamic Studies Program at Harvard University.

Morocco, ca. 1642 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Fezzae et Marocchi regna Africae celeberrima, describebat Abrah. Ortelius. It was published by Willem Blaeu ca. 1642. Scale [ca. 1:2,300,000]. Covers Morocco and a portion of Algeria, Portugal, and Spain. Map in Latin.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Africa Sinusoidal projected coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, cities and other human settlements, roads and routes, territorial boundaries, shoreline features, and more. Relief shown pictorially.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Morocco, 1728 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Statuum Maroccanorum, Regnorum nempe Fessani, Maroccani, Tafiletani et Segelomessani secundum suas provincias accurate divisorum, typus generalis novus, ex variis recentioris Geographiae adminicul depromptus et designatus a Io. Chris. Homanno M. D. It was published by Homann in 1728. Scale [ca. 1:3,000,000]. Covers Morocco and portions of Algeria, Western Sahara, and the Canary Islands, Spain. Map in Latin.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Europe Lambert Conformal Conic coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, cities and other human settlements, roads and routes, administrative and territorial boundaries, shoreline features, and more. Relief shown pictorially. Includes views of: "Der Stadt Marocco groester Theil samt dessen Koeniglichen Hof: and "Prospect der Königlichen Residens-Stadt Mequinetz", includes also an inset: "Insula Madera sub Lusitania".This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Carte de la Tunisie

"Tunisie (800 000e) Flle Nord" -- "Tunisie (800 000e) Flle Sud".

Maroc

carte dessinée par R. de Flotte de Roquevaire.