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Response surface methodology (RSM) based on a three-level, three-variable, Box–Behnken design (BBD) was used to optimize the preparation parameters of a hydrogel consisted of polyvinyl alcohol (PVA),a...
Dynamic and controlled rate thermal analysis (CRTA) has been used to characterise alunites of formula [M(Al)3(SO4)2(OH)6] where M+ is the cations K+, Na+ or NH4 +. Thermal decomposition occurs in a se...
In thiswork, a novelcomposite adsorbent with three-dimensional cross-linked polymeric networks based on chitosan (CTS) and attapulgite (APT) was prepared via in situ copolymerization in aqueous soluti...
In thiswork, a novelcomposite adsorbent with three-dimensional cross-linked polymeric networks based on chitosan (CTS) and attapulgite (APT) was prepared via in situ copolymerization in aqueous soluti...
Abstract The thermal degradation behavior of P. halepensis needles treated with two ammonium-polyphosphate-based commercial retardants was studied using thermal analysis (DTG) under nitrogen atmosphe...
This paper concerns the removal of ammonium ions (NH4+) from aqueous solution using a hydrogel composite chitosan graftedpoly (acrylic acid)/rectoritepreparedfromin situ copolymerization. The effects ...
Summary The solid-liquid phase diagrams of binary mixtures of ammonium alum with ammonium iron(III) alum, with aluminum nitrate nonahydrate and with ammonium nitrate and of aluminum sulfate hexadecahy...
Abstract: The ammonium acetate saturation (AMAS) method was used to study the cation-exchange capacity (CEC) of zeolitic volcaniclastic materials from Santorini and Polyegos Islands, Greece. The AMAS ...
Synthetic gel and glass of illitic composition, natural kaolinite, and mixed-layer illite-smectite were used as starting materials for hydrothermal synthesis of ammonium illite.Ammonium illite was pre...
Abstract: The effects of reaction time (2 to 72 h) and NH4+/Al3+ molar ratio (1.6, 2.4 and 3.2) on the hydrothermal synthesis of ammonium-saponites are investigated. The gels are obtained by mixing po...
A new X-ray diffraction method for the determination of the amount and distribution of fixed NHt in illite-smectite has been developed. Illite-smectite was saturated with K+ and heated at ISO !aC Th...
Abstract: Ammonium-saponite is hydrothermally grown at temperatures below 300°C from a gel with an overall composition corresponding to (NH4)0.6Mg3Si3.4Al0.6O10(OH)2. The synthetic saponite and co-exi...
Pierre shale samples from a thin stratigraphic zone within the contact aureole of the lamprophyric Walsen dike record changes due to thermal effects that are not influenced by detrital differences. An...
To determine the parameters that control the attack of Mn minerals by acid ammonium oxalate in darkness (AAOD), rhodochrosite, pyrolusite, manganosite, hausmannite, and bixbyite were shaken with AAOD ...
Clinoptilolite from the Fort LaClede deposit in Sweetwater County, Wyoming, shows a moderate selectivity for NH4- over Na+ in aqueous solution. At 30°C, the standard free energy of this replacement re...

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