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Low-Cost Adsorbent for Ammonia Nitrogen Removal
Published in Iqbal M. Mujtaba, Thokozani Majozi, Mutiu Kolade Amosa, Water Management, 2018
A. Y. Zahrim, L. N. S. Ricky, Y. Lija, I. Azreen
Natural zeolites are abundant and mostly applied for very specific chosen pollutants (Erdem et al., 2004, Perić et al., 2004, Sarioglu, 2005). The application of natural zeolite as adsorbent for the separation and purification process has been investigated by several researchers ( Karadag et al., 2006, Saltalı et al., 2007, Thornton et al., 2007, Wang and Peng, 2010, Alshameri et al., 2014, Martins et al., 2017). The experimental data summarized that the maximum adsorption capacity of natural Turkish zeolite was 5.95 mg/g (Karadag et al., 2006). Thornton et al. (2007) studied the ability of natural zeolite mesolite in removing ammonia nitrogen at different adsorbate concentrations and the adsorption capacities obtained were 55.0 and 49.0 at initial concentrations of 50 and 400 mg/L, respectively (Thornton et al., 2007).
Water Vapor Adsorption by Zeolites
Published in A. K. Haghi, Ana Cristina Faria Ribeiro, Lionello Pogliani, Devrim Balköse, Francisco Torrens, Omari V. Mukbaniani, Applied Chemistry and Chemical Engineering, 2017
Sefika Çağla Sayilgan, Semra Ülkü
Zeolites are classified into two groups according to the structural changes and continuity of dehydration curves. While zeolite A, X, Y, and chabazite, clinoptilolite which remain stable up to temperature range of 700-1000°C take place in the first group and natrolite, scolecite, and mesolite which transform into a metastable phase after dehydration are categorized in the second group. Although there are not any topographic changes in the framework structure of zeolites, the cation locations may change during reversible and continuous dehydration process.9, 14, 69, 75, 97 For instance, Na+ ions, which are located in the 8-ring and displaced about 1.2 Å from the center of dehydrated zeolite A, causes blocking of pores and affects the adsorption ability of zeolite A.
Inorganic Polymers
Published in Charles E. Carraher, Carraher's Polymer Chemistry, 2017
Zeolites are three-dimensional microporous crystalline solids. Zeolites include a whole group of aluminosilicates with an approximate formula of SiAlO4. With respect to the type of bonding, zeolites can be divided into three groups. The natrolite group (mesolite, thomsonite, edingtonite, natrolite) consists of structures that are built up from rings of four SiAlO4 tetrahedra linked together into chains with fewer linkages between the chains so that cleavage along the chain direction is preferred. These materials generally have a fibrous character. In the heulandite group (stilbite, epistilbite, and heulandite), the SiAlO4 tetrahedra form sheets of six-membered rings with few linkages between the sheets. These materials are mica-like in behavior. The third group, the so-called framework zeolites, has the density of bonding similar in all three directions. This group includes most of the zeolites mentioned below.
Understanding the growth of the bio-struvite production Brevibacterium antiquum in sludge liquors
Published in Environmental Technology, 2018
Francisco Simoes, Peter Vale, Tom Stephenson, Ana Soares
A PB experimental design was used to screen seven factors: Mg2+, NH4-N, PO4-P, Ca2+, NaCl acetate, and oleic acid at two different concentrations (Table 1). The concentration of NH4-N in the sludge dewatering liquors was decreased by applying 8 g/L of Mesolite (NanoChem Pty Ltd, Sydney, Australia) to the sludge dewatering liquors and allowed to equilibrate under agitation with a magnetic stirrer for 18 h. Mesolite is an ion exchange zeolite medium that has been shown to be highly selective for NH4-N when applied to sludge dewatering liquors [16].