scholarly journals REDUCTION OF METAL CATIONS CONTENT FROM THE AQUEOUS SOLUTIONS BY SORBENTS

2021 ◽  
Vol 2021 (6) ◽  
pp. 5307-5311
Author(s):  
IVETA PANDOVA ◽  
◽  
MIROSLAV RIMAR ◽  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Natural Zeolite ◽  
Metal Cations ◽  
Sorption Kinetics ◽  
Synthetic Zeolite ◽  
Natural Zeolites ◽  
Chemically Treated ◽  
Synthetic Zeolites

The article presents the results of research on reducing the concentration of heavy metals, such as copper and nickel, on natural zeolite in comparison with synthetic zeolite and chemically treated natural zeolite. The reduction of the content of specific types of heavy metals from aqueous solutions was investigated by the method of sorption kinetics. The results indicate the ability of natural zeolites to compete with synthetic zeolites.

scholarly journals Removing Ammonia From Wastewater Using Natural and Synthetic Zeolites: A Batch Experiment

2019 ◽  
Author(s):  
Judit Canellas ◽  
Ana Soares ◽  
Bruce Jefferson
Keyword(s):  
Ion Exchange ◽  
Research Direction ◽  
Synthetic Zeolite ◽  
Variable Load ◽  
Natural Zeolites ◽  
Component Solution ◽  
Synthetic Zeolites ◽  
Real Wastewater ◽  
Regeneration Efficiency ◽  
Natural And Synthetic

Ion exchange based processes for the removal of ammonium from wastewater using zeolites could be an attractive additional or potentially complementary treatment option for conditions that pose a challenge for biological processes, such as variable load or low temperatures. A range of natural and synthetic zeolites have been studied for removing ammonium from wastewater. However, the relatively low capacity of zeolites and challenges regarding regeneration have so far complicated efforts in this research direction. Here, we compare the most commonly used natural zeolites US-Clinoptilolite, UK-Clinoptilolite, Mordenite and Chabazite (using Na- and Ca- as main cation exchanger) as well as a thermally modified US-Clinoptilolite and a synthetic zeolite MesoLite in terms of their capacity and regeneration efficiency to determine whether a synthetic zeolite like MesoLite can address the aforementioned problems related to capacity and regeneration efficiency. This investigation was performed as a series of batch experiments on synthetic and real wastewater solutions. When zeolites were pre-saturated with sodium ions, we found the overall highest capacity of 4.6 meq/g for the synthetic zeolite MesoLite, relative to a range between 1.1 and 2.1 meq/g for the natural zeolites. Ammonium adsorption capacity of MesoLite with real wastewater ranged between 74 and 97% of what was observed for a synthetically generated mono component solution set at approximately the same ionic load. Our results indicate that MesoLite could be an appropriate media for ion-exchange based tertiary treatment of wastewater.

scholarly journals Wastewater Treatment for Heavy Metals and Dyes Using Low-Cost Biosorbents: A Review

2021 ◽  
Vol 44 (2) ◽  
pp. 47-56
Author(s):  
Andreea BONDAREV
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Aqueous Solutions ◽  
Industrial Wastewater ◽  
Dye Removal ◽  
Environmental Problem ◽  
Low Cost ◽  
Sorption Kinetics ◽  
Inorganic Cations ◽  
Sustainable Wastewater Treatment

The pollution of industrial wastewater with heavy metals and dyes is a highly important environmental problem, because of the propagation of the pollution and because of its unfavourable consequences. Sustainable wastewater treatment is one of the foremost challenges of this century. Various waste materials characterized by lignocellulose composition are low cost, non-conventional adsorbent for biosorptive removal of heavy metal ions from aqueous solutions. Recent studies point to the potential of use of low-cost materials (zeolites, carrot residue and green tea waste) as effective sorbents for the removal of Cd2+ from aqueous solution. The use of bentonite to the treatment of wastewater containing reactive dyes in aqueous solutions requires the modification of the hydrophilic surface by inorganic cations with organic cations exchange. The use of bentonite as an inexpensive sorbent for the removal of Remazol Brilliant Blue R (RBBR) from synthetic aqueous solutions has been also presented in recent studies. The influence of some parameters such as: pH, initial dye concentration, sorbent dose on sorption kinetics for dye removal has been reviewed in this paper.

scholarly journals Study of the sorption properties of titanium phosphatestowards the metal ions.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 57-62
Author(s):  
P. E. Evstropova ◽  
◽  
M. V. Maslova ◽  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Sorption Process ◽  
Sorption Kinetics ◽  
Chemical Affinity ◽  
Cobalt Ions ◽  
Zinc Cadmium ◽  
Lead Zinc ◽  
Pseudo Second Order ◽  
Phosphate Groups

The process of sorption of lead, zinc, cadmium and cobalt ions from aqueous solutions on titanium-containing sorbents of various compositions is studied. Morris —Weber and Boyd diffusion models, Lagergren pseudo-first ordermodels, and Ho and Mackay pseudo-second order models were used to simulate sorption kinetics. It was shown that the speed of the sorption process is influenced by both the composition of the sorbent and the interaction in the sorbent —sorbate system. Thehigh chemical affinity of the studied cations to phosphate groups determines the prospects of using titanium phosphate for the concentration of heavy metals and their subsequent immobilization in phosphate matrices.

scholarly journals Removing Ammonia From Wastewater Using Natural and Synthetic Zeolites: A Batch Experiment

2019 ◽  
Author(s):  
Judit Canellas ◽  
Ana Soares ◽  
Bruce Jefferson
Keyword(s):  
Ion Exchange ◽  
Research Direction ◽  
Synthetic Zeolite ◽  
Variable Load ◽  
Natural Zeolites ◽  
Component Solution ◽  
Synthetic Zeolites ◽  
Real Wastewater ◽  
Regeneration Efficiency ◽  
Natural And Synthetic

Ion exchange based processes for the removal of ammonium from wastewater using zeolites could be an attractive additional or potentially complementary treatment option for conditions that pose a challenge for biological processes, such as variable load or low temperatures. A range of natural and synthetic zeolites have been studied for removing ammonium from wastewater. However, the relatively low capacity of zeolites and challenges regarding regeneration have so far complicated efforts in this research direction. Here, we compare the most commonly used natural zeolites US-Clinoptilolite, UK-Clinoptilolite, Mordenite and Chabazite (using Na- and Ca- as main cation exchanger) as well as a thermally modified US-Clinoptilolite and a synthetic zeolite MesoLite in terms of their capacity and regeneration efficiency to determine whether a synthetic zeolite like MesoLite can address the aforementioned problems related to capacity and regeneration efficiency. This investigation was performed as a series of batch experiments on synthetic and real wastewater solutions. When zeolites were pre-saturated with sodium ions, we found the overall highest capacity of 4.6 meq/g for the synthetic zeolite MesoLite, relative to a range between 1.1 and 2.1 meq/g for the natural zeolites. Ammonium adsorption capacity of MesoLite with real wastewater ranged between 74 and 97% of what was observed for a synthetically generated mono component solution set at approximately the same ionic load. Our results indicate that MesoLite could be an appropriate media for ion-exchange based tertiary treatment of wastewater.

scholarly journals COMPARATIVE OF NATURAL ZEOLITE – CLINOPTILOLITE ELIMINATION OF METAL IONS/ESPECIALLY Cu (II) WITH D-PENICILLAMINE FROM BIOLOGICAL ENVIRONMENTS

2021 ◽  
Vol 36 (4) ◽  
pp. 11-19
Author(s):  
Abdollah Forughirad ◽  
Ataallah Bahrami ◽  
Khalil Farhadi ◽  
Anahita Fathi Azerbaijani ◽  
Fatemeh Kazemi
Keyword(s):  
Aqueous Solutions ◽  
Molecular Sieve ◽  
Natural Zeolite ◽  
Metal Cations ◽  
Biological Medium ◽  
High Ability ◽  
Copper Adsorption ◽  
Heavy Metal Cations ◽  
Initial Adsorption ◽  
Copper Cations

Clinoptilolite is used as an adsorbent to remove heavy metal cations due to its function as a molecular sieve. This molecular sieve characteristic has made it possible to study the efficiency of clinoptilolite and D-Penicillamine in a comparative way in terms of the adsorption of heavy metals (especially copper) from a biological medium. For this purpose, clinoptilolite was subjected to grinding to produce a homogenized micronized powder in two sizes with d90=75 and 150 μm. Then, initial adsorption tests in an aqueous medium were performed on 10 ppm solutions of iron, zinc, copper, cadmium and nickel cations in single cation solutions, as well as a mixture of cations. In the next step, tests were performed to evaluate the adsorption of Cu2+ on clinoptilolite under different conditions. Experiments have been performed to investigate the effect of pH, temperature (T), adsorbent dosage, time and cation concentration in a simulated biological medium. According to the results, clinoptilolite has a high ability to remove metal cations from aqueous solutions. The 99.71% removal of copper cations by clinoptilolite indicates the high ability of this mineral to remove copper from any environment. In a simulated biological medium at pH=7 and 5, the copper adsorption rate was 98.18% and 97.45% respectively, which indicates the high ability of zeolite to absorb copper cations under biological conditions. An examination of the mass balance calculations has also shown the ability to replace clinoptilolite with penicillamine; 15 mg of clinoptilolite removes 214 mg of Cu from aqueous solutions, which is equivalent to the formation of copper-penicillamine chelate.

COPPER (Cu2+) REMOVAL FROM WATER USING NATURAL ZEOLITE FROM GEDANGSARI, GUNUNGKIDUL, YOGYAKARTA

2015 ◽  
Vol 2 (2) ◽  
Author(s):  
Wahyu Wilopo ◽  
Septiawan Nur Haryono ◽  
Doni Prakasa Eka Putra ◽  
I Wayan Warmada ◽  
Tsuyoshi Hirajima
Keyword(s):  
Waste Water ◽  
Economic Growth ◽  
Heavy Metals ◽  
Natural Zeolite ◽  
Adsorption Equilibrium ◽  
Waste Water Treatment ◽  
Batch Test ◽  
Maximum Capacity ◽  
Geological Materials ◽  
Langmuir Adsorption

Development of indusrialization and urbanization not only increase economic growth but also contribute to the environmental degradation, especially contamination of heavy metals in water. In other side, there are many geological materials have capability to immobilize heavy metals. Therefore, the objective of this research is to know the maximum capacity of natural zeolite from Trembono area, Gunung Kidul regency to immobilize copper (Cu2+) from water and to understand their mechanism. This experiment was carry out by a batch test. The result showed that the maximum capacity of zeolite to immobilize Cu (qmax) is 63,69 mmolCu/kg Zeolite according to Langmuir adsorption equilibrium model. In addition, the capability to immobilize Cu will increases due to decreasing the grain size. The result of this research can be used as an alternative for waste water treatment, especially Cu. Keywords: Removal, copper (Cu2+), natural zeolite, Langmuir isotherm

Oxidized eucalyptus charcoal: a renewable biosorbent for removing heavy metals from aqueous solutions

2021 ◽  
Author(s):  
Elias Costa de Souza ◽  
Alexandre Santos Pimenta ◽  
Alfredo José Ferreira da Silva ◽  
Paula Fabiane Pinheiro do Nascimento ◽  
Joshua O. Ighalo
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions

scholarly journals Combined Influence of Low-Grade Metakaolins and Natural Zeolite on Compressive Strength and Heavy Metal Adsorption of Geopolymers

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 486
Author(s):  
Alcina Johnson Sudagar ◽  
Slávka Andrejkovičová ◽  
Fernando Rocha ◽  
Carla Patinha ◽  
Maria R. Soares ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Compressive Strength ◽  
Natural Zeolite ◽  
Metal Adsorption ◽  
Low Grade ◽  
Heavy Metal Adsorption ◽  
Adsorption Model ◽  
X Ray ◽  
Adsorption Capacities

Metakaolins (MKs) prepared from low-grade kaolins located in the Alvarães (A) and Barqueiros (B) regions of Portugal were used as the aluminosilicate source to compare their effect on the compressive strength and heavy metal adsorption of geopolymers. Natural zeolite, an inexpensive, efficient adsorbent, was used as an additive in formulations to enhance geopolymers’ adsorption capacities and reduce MK utilization’s environmental footprint. Geopolymers were synthesized with the replacement of MK by zeolite up to 75 wt.% (A25, B25—25% MK 75% zeolite; A50, B50—50% MK 50% zeolite; A75, B75—75% MK 25% zeolite; A100, B100—100% MK). The molar ratios of SiO2/Al2O3 and Na2O/Al2O3 were kept at 1 to reduce the sodium silicate and sodium hydroxide environmental impact. Geopolymers’ crystallography was identified using X-ray diffraction analysis. The surface morphology was observed by scanning electron microscopy to understand the effect of zeolite incorporation. Chemical analysis using X-ray fluorescence spectroscopy and energy dispersive X-ray spectroscopy yielded information about the geopolymers’ Si/Al ratio. Compressive strength values of geopolymers obtained after 1, 14, and 28 days of curing indicate high strengths of geopolymers with 100% MK (A100—15.4 MPa; B100—32.46 MPa). Therefore, zeolite did not aid in the improvement of the compressive strength of both MK-based geopolymers. The heavy metal (Cd2+, Cr3+, Cu2+, Pb2+, and Zn2+) adsorption tests exhibit relatively higher adsorption capacities of Barqueiros MK-based geopolymers for all the heavy metals except Cd2+. Moreover, zeolite positively influenced divalent cations’ adsorption on the geopolymers produced from Barqueiros MK as B75 exhibits the highest adsorption capacities, but such an influence is not observed for Alvarães MK-based geopolymers. The general trend of adsorption of the heavy metals of both MK-based geopolymers is Pb2+ > Cd2+ > Cu2+ > Zn2+ > Cr3+ when fitted by the Langmuir isotherm adsorption model. The MK and zeolite characteristics influence geopolymers’ structure, strength, and adsorption capacities.

Sign in / Sign up

Export Citation Format

Share Document