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In order to increase the absorption capacity of Zeolite of NH4+-N, clinoptilolite from Henan Gongyi was modified, and the modified zeolite concentration was 50 mg·L-1 imulated NH4+-N wastewater modified after the use of roasting by static test, microwave, acid, salt, and integrated heat, the result of experiments was that the Zeolite adsorption of Natural Zeolite and six modified zeolite adsorption...
The removal of ammonia from aqueous solutions using zeolites (ZFAs) synthesized from coal fly ash (CFA) as low-cost absorbent was investigated in a batch mode. When raw CFA was subjected to alkaline hydrothermal zeolite synthesis, the Zeolite X (ZFA-X) and zeolite A (ZFA-A) were formed. ZFAs had a much greater ability than CFA to remove ammonia. The pH strongly influenced ammonia removal by ZFAs....
The ammonia nitrogen and phosphorus adsorption on natural zeolite were studied. Experimental data shows, the Freundlich and Langmuir models agrees very well with experimental data on ammonium and phosphorus, respectively ; Zeolite adsorption of ammonia nitrogen and phosphorus removal process should follow the secondary dynamic equation; In certain concentration range of ammonia nitrogen, zeolite and...
The adsorption of Cu2+ from pharmaceutical wastewater by zeolite was studied in a batch adsorption system. Factors influencing copper adsorption such as pH (1-5), adsorbent dosage (5-50 g/L) and contact time (20-600 min) were investigated. The equilibrium of adsorption process was established in about 480 min, while pH was 5 and adsorbent dosage was 30 g/L. After the adsorption equilibrium was achieved,...
Adsorption of humic acid (HA) and Cu(II) onto cetyl pyridinium bromide (CPB) modified zeolite was investigated in single- and binary-adsorbate systems. The equilibrium adsorption data of HA and Cu(II) onto CPB modified zeolite in the single-adsorbate system were analyzed by the Langmuir and Freundlich isotherm models. The equilibrium adsorption data were well described by the Langmuir isotherm model,...
Organic zeolite (CTAB-Z) was modified with cationic surfactant-cetyltrimethylammonium bromide (CTAB) in this study under the following conditions: CTAB concentration 1.0% (wt%), modification temperature 25°C, modification time two hours and used to remove SO42- from water and wastewater as adsorbent. Some factors which influence the removal ratio of SO42- from water sample such as mesh size of CTAB-Z,...
The ammonia nitrogen and phosphorus adsorption on natural zeolite were studied. Experimental data shows, the Freundlich and Langmuir models agrees very well with experimental data on ammonium and phosphorus, respectively; Zeolite adsorption of ammonia nitrogen and phosphorus removal process should follow the secondary dynamic equation; In certain concentration range of ammonia nitrogen, zeolite and...
The anti-ammonia shock load capacity of zeolite-ceramics biological aerated filter is studied. It is turned out that anti-ammonia shock load process can be divided into two processes of absorption and release, during which the effluent ammonia nitrogen concentration is always less than 4mg/L. In adsorption process, the ammonia nitrogen removal mainly occurs in the 0~35cm zeolite layer, accounting...
The zeolite was used to treat the groundwater. The various solutions with initial manganese (Mn2+) concentration ranging from 0.5 to 1.5mg/L were prepared in this study. The nature zeolite has cation-exchange capacity and higher absorption capacity for Mn2+ from ground water with 1.89 and 2.69 mg/g at 288 and 298K. Adsorption date were well described by the Langmuir model and the thermodynamic constants...
In this paper the natural zeolite from the Sakhaptinsk deposit (Krasnoyarsk Territory) was tested as adsorbent for removal of Fe2+, Fe3+, Mn2+, Ca2+, NH4+ from aqueous solutions and well water of Kozhevnikovsky District (Tomsk Region) under dynamic conditions. The physico-chemical and adsorption properties of the zeolite were studied by XRD, TGA, DTA, FTIR spectroscopy, SEM, chemical analyses. It...
The bench-scale test of toluene decomposition is carried out using adsorption and surface discharge with gas circulation. The liquid toluene is vaporized in the circulation line, and the toluene gas is adsorbed by the adsorbent. The hydrophobic zeolite pellet is used as an adsorbent. After the toluene adsorption, ozone generated by surface discharge is supplied to the adsorbent and adsorbed toluene...
When evaluating small-animal imagers, small pointlike sources (<;1mm diam.) are useful for testing system performance. Slightly larger sources (1-3 mm) can also be used to mimic tumors. Ideal sources should have high uptake of TcO4-, and should not be damaged during preparation or handling. Various crystalline minerals are able to adsorb a variety of chemical species, and may satisfy these criteria...
The natural zeolite was investigated as an inexpensive and effective adsorbent for the adsorption of Amido Black 10B, Acid Red and Safranine T from its queous solution respectively. The effect of parameters such as the solution of pH, contact time, the doze of the natural zeolite and the initial concentration of dye was examined. The adsorption isotherm was well fitted to both the Langmuir and Freundlich...
The applicability of two iron-coated zeolites prepared by alkalescent deposition and heating evaporation for the treatment of As(III) via adsorption processes was investigated. Scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD) and BET were used to observe the surface properties of the coated layer. The influences of different sorption parameters such as contact time, dosing...
The modification methods on artificial zeolite by NH4Cl-FeCl3 and NH4Cl-KAl(SO4)2 were studied by the experiment. The mechanism on modifying adsorbent was preliminarily discussed. The main technical parameters were determined on adsorption treatment of high fluoride drinking water using modified artificial zeolite. The key factors of affecting the F- removal efficiency were revealed. The study provided...
Zeolit/Ag+ composite particles material (ZACPM) had been prepared using zeolite as carrier by carrying Ag+, solidifying Ag+ stably in the holes of zeolite and enhancing the adsorption property of zeolite. The effects of technological parameters on preparation of ZACPM, the air purification properties such as antibacterial property and the function of eliminating harmful gases and the microstructure...
By using a hydrothermal treatment process, coal fly ash was transferred to a series of synthesized zeolites and characterized XRD and SEM observations. The synthesized zeolites exhibited more enhanced adsorption capacities for metals compared to the raw material as the increased CEC of the synthesized zeolites apparently provides a better adsorptive ability for metals. For the three synthesized zeolite...
Iron coated zeolite is made and its adsorption characteristics are compared with activated alumina and zero-valent iron to get further understand of the new adsorbent. The results show that iron coated zeolite removes As(V) in the similar with that by activated alumina with removal rate of 50% in first 5min's adsorption but slower after 60 mins' adsorption and faster than that by zero-valent iron...
In order that ammonia could be removed effectively from wastewater, zeolite has been modified and be used for adsorbing the ammonia. Meanwhile the chemical ingredient and surface analysis of zeolite has been investigated. SEM of modified zeolite showed that there were lots of cavities and multitudinous holes with medium and macropores diameters. Such structure would be very useful to help NH4+ ions...
The chemical properties of fly ash and FAZ (synthesized zeolite made from fly ash) were studied by XRD. The results from this study showed that quartz and mullite were the main composition of fly ash and FAZ was a single-kind zeolite with residual unreacted fly ash. Moreover, the effects of FAZ diameter, dosage and contact time on the removal SO42- from monosodium glutamate wastewater were analyzed...
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