Enhanced chromium adsorption capacity via plasma modification of natural zeolites

2016 ◽  
Vol 56 (1S) ◽  
pp. 01AF02 ◽  
Author(s):  
Charisse Marie D. Cagomoc ◽  
Magdaleno R. Vasquez
Keyword(s):  
Adsorption Capacity ◽  
Plasma Modification ◽  
Natural Zeolites ◽  
Chromium 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.

Enhancement of Cu(II) adsorption on activated carbons by non-thermal plasma modification in O2, N2 and O2/N2 atmospheres

2020 ◽  
Vol 18 (4) ◽  
Author(s):  
Long Wu ◽  
Yimeng Cai ◽  
Jiayong Tu ◽  
Shizhe Wang ◽  
Noriyuki Kobayashi ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Thermal Plasma ◽  
Activated Carbons ◽  
Chemical Properties ◽  
Plasma Modification ◽  
Adsorption Performance ◽  
Ft Ir ◽  
Non Thermal Plasma ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractActivated carbon (AC) was modified by using non-thermal plasma in O2, N2 and O2/N2 atmospheres to increase its Cu(II) adsorption capacity and quantify the influences of the modifying atmospheres. SEM, BET, FT-IR and XPS were used to characterize the surface physical and chemical properties of AC. The results show that the AC modified by using plasma had significantly better Cu(II) adsorption performance than the raw AC. Among the O2, N2 and O2/N2 atmospheres, the AC with plasma modification in N2 showed best Cu(II) adsorption performance and the Cu(II) adsorption capacity was 369.5% higher than the raw AC. The AC modified in O2 atmosphere can form C—COOH groups, while the AC modified in N2 atmosphere can form C—NH2 groups. These two groups are both beneficial for Cu(II) adsorption, where the —NH2 groups are more effective for Cu(II) adsorption compared to —COOH groups. The chemisorption dominated the Cu(II) adsorption on the plasma modified AC and the adsorption performance was dependent on the surface functional groups properties of AC.

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.

scholarly journals Pengaruh Konsentrasi Aktivator Asam Fosfat (H3PO4) pada Pembuatan Karbon Aktif dari Sabut Kelapa terhadap Adsorpsi Logam Kromium

2021 ◽  
Vol 5 (1) ◽  
pp. 45
Author(s):  
Hamida Ishmatu Sholikhah ◽  
Hartika Rahma Putri ◽  
Inayati Inayati
Keyword(s):  
Optimum Condition ◽  
Phosphoric Acid ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Potassium Chromate ◽  
Maximum Adsorption Capacity ◽  
Activator Concentration ◽  
Coconut Fiber ◽  
Chromium Adsorption ◽  
As Adsorption

Chromium is one of the hazardous heavy metal contained in the industrial wastewater. It can be reduced by various methods, such as adsorption. The purpose of this study was initialized an activated carbon from coconut fiber by various phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) activator concentration (0,1M; 0,5M; 1M; 1,5M; 2M) and variation of contact time (30; 60; 90; 120; 150; 180 minutes) to obtain optimum adsorption capacity of chromium. Analysis of the activated coconut fiber carbon by SAA obtained a surface area of 53,39 m<sup>2</sup>/g. The potassium chromate (K<sub>2</sub>CrO<sub>4</sub>) solution was adsorbed by the adsorbent and then analyzed by a UV-VIS Spectrophotometer to measure the chromium content. This study proved that chromium adsorption by activated coconut fiber carbon was increased by the time until reaching optimum condition. Enhancement of adsorption capacity was directly proportional as the more concentrated phosphoric acid activator. Maximum adsorption capacity obtained was 3,464 mg/g and the optimum condition was at contact time of 150 minutes with the phosphoric acid activator concentration of 2M.

scholarly journals Removal of Radioactive Iodide by Surfactant-Modified Zeolites

2003 ◽  
Vol 21 (4) ◽  
pp. 373-381 ◽  
Author(s):  
Hossein Faghihian ◽  
Akbar Malekpour ◽  
Mohammad G. Maragheh
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Exchangeable Cations ◽  
Natural Zeolites ◽  
Zeolite Surface ◽  
Surfactant Modification ◽  
Liquid Wastes ◽  
Modified Zeolites ◽  
Modified Forms ◽  
Adsorbent Materials

The removal of radionuclides such as 129I and 131I from radioactive liquid wastes was studied. Two natural zeolites were modified with different quaternary alkylammonium ions to replace the exchangeable cations from the zeolite surface and used as adsorbent materials. The quaternary ions used for such purpose were hexadecyltrimethylammonium, tetradecyltrimethylammonium, dodecyltrimethylammonium, tetrabutylammonium and tetramethylammonium, respectively. Some of the modified forms exhibited an adsorption capacity much higher than those of the respective natural samples. In contrast, the adsorption capacity was negligible when tetrabutylammonium and tetramethylammonium ions were used. Adsorption experiments were conducted by batch and continuous experiments, and adsorption isotherms constructed from the data obtained. The effect of interfering anions on the adsorption capacity was also investigated as were the breakthrough behaviours of radioiodide in a column charged with the various adsorbents. Desorption of iodide from the modified zeolites into different solutions was also investigated. It was concluded that, in some cases, surfactant modification was an efficient process for the uptake and immobilization of iodide.

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