Enhancement of Ammonium Adsorption Capacity with Pretreated Natural Zeolites

Habitation ◽  
2009 ◽  
Vol 12 (1) ◽  
pp. 97-102 ◽  
Author(s):  
Charles Glass ◽  
Ressa Chee Wah
Keyword(s):  
Adsorption Capacity ◽  
Natural Zeolites ◽  
Ammonium Adsorption

Solar Refrigerator With Efficient Adsorbent

2009 ◽  
Author(s):  
Jessica Trujeque Bolio
Keyword(s):  
Hydrogen Bonds ◽  
Adsorption Capacity ◽  
Environmental Conditions ◽  
Natural Zeolites ◽  
Composite Sorbent ◽  
Humid Climate ◽  
Gaseous State ◽  
Cooling Technology ◽  
Desorption Mechanism ◽  
Efficient Adsorbent

The design a solar-sorption refrigerator to be used in the warm and humid climate of Mexico, the most critical environmental conditions and most demanding climatic zone for cooling technology, requires that the adsorption capacity of the composite sorbent to be characterize. It must be verified that the composite sorbent such as silica gel, calcium chloride and various natural zeolites, with different substances in a gaseous state as sorbate, (water, methanol and ethanol), has hydrogen bonds that can be united and broken easily, measuring the amount of energy required by the sorption-desorption mechanism.

scholarly journals Adsorpsi Asam Humat pada Zeolit Alam yang Dimodifikasi dengan TiO2

2020 ◽  
Vol 11 (1) ◽  
pp. 43-51
Author(s):  
Upita Septiani ◽  
Fiska Julian Tasari ◽  
Zilfa Zilfa
Keyword(s):  
Humic Acid ◽  
Adsorption Capacity ◽  
Natural Zeolite ◽  
Sol Gel ◽  
Sem Analysis ◽  
Maximum Adsorption Capacity ◽  
Natural Zeolites ◽  
X Ray ◽  
West Sumatra ◽  
Silica Alumina

This research modified natural zeolite with TiO2 synthesized by the sol-gel process which was applied as a humic acid adsorbent. The purpose of this study was to coat natural zeolites with TiO2 to increase the adsorption capacity of natural zeolites as humic acid adsorbents. The natural zeolite powders were obtained from Kabupaten Solok, West Sumatra, based on X-ray Fluorescence (XRF) analysis, the ratio of silica/alumina (Si/Al) was 4.35, indicating that natural zeolite was clinoptilolite zeolite. Scanning Electron Microscopy (SEM) analysis showed natural zeolite has a rough surface with closed pores while zeolite coated with TiO2 (zeolite/TiO2) has a homogeneous, smooth surface with open pore. The results of the Energy Dispersive X-Ray Spectroscopy (EDS) analysis showed that the level of TiO2 was 7.1%, this result showed that TiO2 has been coated on the surface of the zeolite. Natural zeolite and zeolite/TiO2 were applied as humic acid adsorbents. Maximum adsorption capacity of natural zeolites and zeolites/TiO2 were 0.2787 mg/g and 1.199 mg/g, respectively.

scholarly journals Carboxyl and hydroxyl groups enhance ammonium adsorption capacity of iron (III) chloride and hydrochloric acid modified biochars

2020 ◽  
Vol 309 ◽  
pp. 123390 ◽  
Author(s):  
Siyuan Wang ◽  
Shaoying Ai ◽  
Christopher Nzediegwu ◽  
Jin-Hyeob Kwak ◽  
Md Shahinoor Islam ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Capacity ◽  
Hydroxyl Groups ◽  
Ammonium Adsorption

scholarly journals Optimization of the metakaolin geopolymer preparation for maximized ammonium adsorption capacity

2017 ◽  
Vol 52 (16) ◽  
pp. 9363-9376 ◽  
Author(s):  
Tero Luukkonen ◽  
Emma-Tuulia Tolonen ◽  
Hanna Runtti ◽  
Kimmo Kemppainen ◽  
Paavo Perämäki ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Ammonium Adsorption ◽  
Metakaolin Geopolymer

scholarly journals Utilization of Natural Zeolite from Ponorogo and Purworejo for Naphthol Substance Adsorption

2018 ◽  
Vol 31 ◽  
pp. 05002
Author(s):  
Sundus Imandiani ◽  
Christine Indira ◽  
Anthony Johan ◽  
Budiyono
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Capacity ◽  
Natural Zeolite ◽  
Adsorption Process ◽  
Test Results ◽  
Natural Zeolites ◽  
Optimum Conditions ◽  
Hcl Concentration

Indonesia has many zeolite producing areas yet untapped. Researchers developed the utilization of natural zeolites useful for the adsorption of naphthol dyes commonly found in batik waste. In this study researchers used natural zeolites from Purworejo and Ponorogo that are activated using hydrochloric acid that is used for adsorption. The purpose of this research is to know the effect of natural zeolite activation from Ponorogo and Purworejo on the effectiveness of adsorption of naphthol dyes widely used in batik industry. Natural zeolite was activated using HCl concentration of 1.3N; 1.8N; 3.2N; and 3.9N for 60 minutes. The methods are preparation of natural zeolite from Purworejo and Ponorogo, dealumination using hydrochloric acid, adsorption process of naphthol dyes using activated zeolite, and test of adsorption result with uv-vis spectrophotometry. The test results showed that the higher HCl concentration will increase adsorption capacity. This can be known from the concentration of naphthol dye which decreased both using natural zeolite Ponorogo and Purworejo. While the effectiveness of adsorption shows natural zeolite Purworejo has a greater adsorption capacity than Ponorogo with optimum conditions of dealumination using concentration HCl 3,9N.

The Physicochemical Characteristics of Natural Zeolites Governing the Adsorption of Pb2+ from Aqueous Environment

2019 ◽  
Vol 811 ◽  
pp. 92-98 ◽  
Author(s):  
Tita Puspitasari ◽  
Moh. Mualliful Ilmi ◽  
Nadya Nurdini ◽  
Rino R. Mukti ◽  
Cynthia L. Radiman ◽  
...  
Keyword(s):  
Detailed Analysis ◽  
Adsorption Capacity ◽  
Natural Zeolite ◽  
Physicochemical Characteristics ◽  
Aqueous Environment ◽  
Natural Zeolites ◽  
Net Charge ◽  
Major Phase ◽  
Two Samples ◽  
Two Factors

The aim of this study is to investigate the effect of natural zeolites characteristics on the adsorption capacity of Pb2+ from an aqueous environment. The used natural zeolites were originated from 3 regions in Indonesia. i.e. Bayah, Banten (coded as ZB) and two samples from South Lampung (coded as ZL-1 and ZL-2) and Nanggung, Bogor (ZN). The characteristics of each natural zeolite were evaluated through a series of detailed analysis including XRD, FTIR, XRF, SEM and N2 physisorption. It was revealed that ZB, ZL-1 and ZL-2 were dominated by clinoptilolite (HEU) frameworks while the major phase of ZN was mordenite (MOR) type. From XRF data, the three natural zeolites (ZB, ZL-1 and ZN) possessed a comparable Si/Al ratio (ca. 5.5 to 6) whereas ZL-2 had slightly lower Si/Al ratio (ca. 4). We found that, at comparable Si/Al ratio, clinoptilolite frameworks has a higher adsorption capacity of Pb2+ compared to that of mordenite due to the compatibility of Pb2+ inside the pores of clinoptilolite. Lower Si/Al ratio of natural zeolite tended to show higher adsorption capacity of Pb2+ since the net charge of zeolite frameworks became more negative. These two factors, the framework type and the Si/Al ratio, are significant for the adsorption capacity. Another factor, i.e. surface area, had no certain effect on the adsorption capacity in this case.

Ammonium Adsorption on Albic Black Soil under the Influence of Fe2+ in Irrigation Water

2012 ◽  
Vol 610-613 ◽  
pp. 2948-2953 ◽  
Author(s):  
Yi Ting Chen ◽  
Hong Guang Cheng ◽  
Xiao Pu ◽  
Chen Ye Lin
Keyword(s):  
Surface Water ◽  
Adsorption Capacity ◽  
Irrigation Water ◽  
Black Soil ◽  
Sanjiang Plain ◽  
Ammonium Concentration ◽  
Flooding Event ◽  
Ammonium Adsorption ◽  
Irrigated Soils

The surface water of Sanjiang Plain generally contained 0.04 to 2.50 mg L-1 of dissolved Fe ion, while the groundwater contained 0.03 to 21.00 mg L-1, which is relative high in comparison with other regions. The purpose of this study was to investigate the effect of dissolved Fe in the irrigation water on the adsorption of ammonium. Soil samples were collected from topsoil of a paddy field. Fe2+concentration in either surface water (0.70 mg L-1) or groundwater (15.0 mg L-1) were simulated to employ batch experiments in lab. The results show that when Fe2+ concentration was 0.70 mg L-1, it might slightly increase ammonium adsorption on the albic black soil. However, when Fe2+ concentration increased to 15.0 mg L-1, it may increase or decrease ammonium adsorption on the albic albic black soil, depending on ammonium concentration in the soil solution. In details, ammonium adsorption capacity decreased when ammonium concentration is less than 30.77 mg L-1, while increased when it’s more than 30.77mg L-1. Long-term irrigated soils with groundwater might increase content of iron oxides in the paddy soils and thus increase ammonium adsorption capacity. However, Fe2+ in the irrigating water might also lead to desorption and leaching of ammonium in each flooding event.

scholarly journals Impact of steel slag on the ammonium adsorption by zeolite and a new configuration of zeolite-steel slag substrate for constructed wetlands

2017 ◽  
Vol 76 (3) ◽  
pp. 584-593 ◽  
Author(s):  
Pengbo Shi ◽  
Yingbo Jiang ◽  
Hongtao Zhu ◽  
Dezhi Sun
Keyword(s):  
Adsorption Capacity ◽  
Ph Value ◽  
Molecular Form ◽  
Steel Slag ◽  
Order Reaction ◽  
Drastic Reduction ◽  
Pseudo First Order Reaction ◽  
Ammonium Adsorption ◽  
Pseudo Second Order ◽  
The One

The CaO dissolution from slag, as well as the effects of influencing parameters (i.e. pH and Ca2+ concentration) on the ammonium adsorption onto zeolite, was systematically studied in this paper. Modeling results of Ca2+ and OH− release from slag indicated that pseudo-second-order reaction had a better fitness than pseudo-first-order reaction. Changing pH value from 7 to 12 resulted in a drastic reduction of the ammonium adsorption capacity on zeolite, from the peak adsorption capacity at pH 7. High Ca2+ concentration in solution also inhibited the adsorption of ammonium onto zeolite. There are two proposed mechanisms for steel slag inhibiting the ammonium adsorption capacity of zeolite. On the one hand, OH− released from steel slag can react with ammonium ions to produce the molecular form of ammonia (NH3·H2O), which would cause the dissociation of NH4+ from zeolite. On the other hand, Ca2+ could replace the NH4+ ions to adhere onto the surface of zeolite. An innovative substrate filling configuration with zeolite placed upstream of the steel slag was then proposed to eliminate the disadvantageous effects of steel slag. Experimental results showed that this novel filling configuration was superior to two other filling configurations in terms of ammonium removal.

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