scholarly journals COMPARATIVE EVALUATION OF ABSORPTION CAPACITY FOR SOME HEAVY METALS BY TWO ARBOREAL LICHENS SPECIES GROWING ON SPRUCE AT DIFFERENT ALTITUDE IN BUCEGI MOUNTAINS

2014 ◽  
Author(s):  
Gabriela Busuioc
Keyword(s):  
Heavy Metals ◽  
Comparative Evaluation ◽  
Absorption Capacity

scholarly journals MODIFICATION AND CHARACTERIZATION OF CEIBA PENTANDRA (L.) GAERTN. (KAPOK) FIBER: PHYSICAL PROPERTIES

2019 ◽  
Vol 7 (7) ◽  
pp. 381-390
Author(s):  
Eduart Wolok ◽  
Idham Halid Lahay ◽  
Buyung R. Machmoed ◽  
Fahriadi Pakaya
Keyword(s):  
Heavy Metals ◽  
Physical Properties ◽  
Protective Layer ◽  
Absorption Capacity ◽  
Natural Material ◽  
Cellulose Content ◽  
Kapok Fiber ◽  
Fiber Properties ◽  
Kapok Fibers

Kapok fiber is a natural material that has unique properties, can be renewed with a large lumen, it has hydrophobic properties, as an absorbent in oil, heavy metals, and sound. To increase the absorption capacity of heavy metals, physical properties, and chemical resistance, modifications were made to change the fiber properties from hydrophobic to hydrophilic. One way is through the process of soaking the kapok fibers in a solvent to remove non-cellulose compounds. In this study, to improve the properties of kapok fiber, soaking has been done with various solutions, there are HCl, NaOH, NaClO, NaClO-NaOH-NaClO, and NaClO2-NaOH-NaClO2 solution. Immersion of kapok fibers in NaClO2-NaOH-NaClO2 solution can increase cellulose content up to 93.69% with porosity content of 4.75%. NaClO2-NaOH-NaClO2-treated can absorb water up to 211.27%, the second highest after treatment with the NaClO-NaOH-NaClO-treated solution of 285.29%. Immersion in NaClO-NaOH-NaClO and NaClO2-NaOH-NaClO2 solvents also causes damage to the kapok fiber protective layer which indicates the loss of lignin, so that a significant change of the hydrophobic fiber becomes hydrophilic as seen in the SEM results.

Comparative Evaluation of Effects of .GAMMA.-Rays and Heavy Metals on Mobility of the Water Flea Daphnia magna

RADIOISOTOPES ◽  
2003 ◽  
Vol 52 (7) ◽  
pp. 319-326 ◽  
Author(s):  
Shoichi FUMA ◽  
Nobuyoshi ISHII ◽  
Nobuyuki TANAKA ◽  
Hiroshi TAKEDA ◽  
Kiriko MIYAMOTO ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Daphnia Magna ◽  
Gamma Rays ◽  
Comparative Evaluation ◽  
Water Flea

Applications of Nanoparticles in Heavy Metal Removal for Wastewater Treatment at Brahmani River

2020 ◽  
Vol 17 (9) ◽  
pp. 4666-4670
Author(s):  
Himanshu Sekhar Rath ◽  
Mira Das ◽  
Smita Rath ◽  
U. N. Dash ◽  
Alakananda Tripathy
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Removal ◽  
Activated Carbons ◽  
Low Cost ◽  
Groundwater Resources ◽  
Heavy Metal Removal ◽  
Absorption Capacity ◽  
Current Standard ◽  
River Stretch

The goal of this research is to determine the current standard of water quality along the Brahmani River stretch in terms of physico-chemical parameters. The River Brahmani receives a substantial amount of industrial waste in the identified study area and is witness to a large amount of human and agricultural activities. Nowadays Ninety percent of Brahmani’s required water is secured with groundwater resources and it is essential to forecast pollutant content in those resources. Hence, this research aimed at using of nanoparticles such as Activated Carbons (ACs) for removal of heavy metal such as nickel and zinc in Brahmani river using the Langmuir approach. Adsorption seems to be the most widely used method for heavy metal recovery due to its low cost, easy installation and the presence of alternative adsorbents. In addition, the process of adsorption can also be made in use to recover heavy metal ions from wastewater. Despite these advantages, adsorption is hard to commercialize. Due to the strong absorption capacity, high number of pores and wide, common area, nanoparticles are treated as the effective method in removal of heavy metals in rivers. Comparative analysis shows that seventy-one percent of heavy metals can be removed using the nanotechnology model.

scholarly journals Comparative Evaluation of Prooxidant/Antioxidant Balance in Seed Progeny of Plantago major L. from Radioactively and Chemically Contaminated Areas

2001 ◽  
Vol 14 (3) ◽  
pp. 306-317
Author(s):  
Nadezhda S. Shimalina ◽  
◽  
Natal'ya A. Orekhova ◽  
Vera N. Pozolotina
Keyword(s):  
Heavy Metals ◽  
Reactive Oxygen Species ◽  
Molecular Weight ◽  
Superoxide Dismutase ◽  
Comparative Evaluation ◽  
Low Molecular Weight ◽  
Oxygen Species ◽  
Plantago Major ◽  
Seed Progeny ◽  
Reference Samples

There are many studies addressing plant responses to radioactive and chemical contamination of soils, but few works have been devoted to comparison of biological effects in the areas affected by these human-induced factors. Ionizing radiation and heavy metals have different mechanisms of interaction with biota. Both factors, however, are capable of increasing the generation of reactive oxygen species, which cause enzyme malfunction and cell structure damage. The efficiency of antioxidant systems plays an important role in plant resistance to these impacts. The present study offers a comparative evaluation of prooxidant/antioxidant balance in seed progeny of Plantago major L. growing in the East Ural Radioactive Trace (EURT), in the zone affected by operation of the Karabash Copper Smelter (KCS), and in the reference sites. Lipid peroxidation was assessed by determining malondialdehyde. Evaluation of the antioxidant system was based on the activities of superoxide dismutase, catalase, and total peroxidase, and on the content of low-molecular-weight antioxidants. The study showed that the prooxidant and antioxidant statuses of seed progeny of P. major from the contaminated sites were different from the reference samples and from each other. The pooled EURT sample exhibited a prooxidant shift relative to the reference samples, i. e. not only malondialdehyde but also activities of superoxide dismutase and catalase and the content of low-molecular-weight antioxidants were higher than in the reference samples. Malondialdehyde content in seedlings from the KCS zone did not differ from the reference values; superoxide dismutase and catalase activities were decreased whereas peroxidase activity was higher compared to the activities of these enzymes in the reference samples. Thus, the differences in the plant adaptive responses to ionizing radiation and heavy metals are caused by the dissimilarities in the induction of reactive oxygen species

scholarly journals Removal of Heavy Metals (Fe, Mn and Cd) from Aqueous Solutions by Natural Zeolite and FeS Media

2021 ◽  
Vol 43 (7) ◽  
pp. 524-536
Author(s):  
Sung-kyu Choi ◽  
Min-jun Kim ◽  
Tae-geon Kim ◽  
Tae-jin Lee
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Molecular Diffusion ◽  
Kinetic Characteristic ◽  
Absorption Capacity ◽  
Langmuir Adsorption Isotherm ◽  
Limiting Factor ◽  
Langmuir Adsorption ◽  
Adsorption Characteristics

Objectives : The adsorption characteristics of Fe, Cd, and Mn in aqueous solution using zeolite and FeS media were investigated by the adsorption isotherm and kinetic model analysis.Methods : The adsorption characteristics of the heavy metals (Fe, Mn, Cd) were investigated using Langmuir or Freundlich adsorption isotherm. The analysis of pseudo-first or pseudo-second order reaction was also attempted to evaluate the rate limiting factor such as molecular diffusion or chemical adsorption on the absorbents.Results and discussion : The adsorption of the heavy metals on the zeolite and FeS media was more suitable for the Langmuir adsorption isotherm, representing that mono-layer absorption on the surface and no interaction between the absorbed solutes. The order of adsorption preference to zeolite was Fe > Cd > Mn, whereas the order of adsorption preference to FeS media was Cd > Fe > Mn. The adsorption kinetics of zeolite and FeS media were more suitable for pseudo-secondary reactions than for pseudo-primary reaction.Conclusions : The absorption capacity of FeS media for the heavy metals (Fe, Cd and Mn) in aqueous solution was higher than that of zeolite. The adsorption pattern was suitable for the Langmuir adsorption isotherm, and has kinetic characteristic by chemisorption.

scholarly journals Biosorpsi ion tembaga dalam limbah tailing menggunakan jamur pelapuk putih amobil Biosorption of copper ion in tailing mining effluent using immobilizede white-rot fungi

2016 ◽  
Vol 83 (1) ◽  
Author(s):  
Firda DIMAWARNITA ◽  
. SUHARYANTO ◽  
. TRI-PANJI1 ◽  
Nur RICHANA ◽  
Achmad ZAINUDIN
Keyword(s):  
Heavy Metals ◽  
Agricultural Land ◽  
Mining Industry ◽  
Copper Ion ◽  
White Rot Fungi ◽  
Ligninolytic Enzymes ◽  
Absorption Capacity ◽  
White Rot ◽  
Pollution Level ◽  
Empty Fruit Bunches

Abstract         Copper and gold mining industry produce large amount of tailings effluent containing heavy metals such as Cu and Hg that will polute  environment and agricultural land, if it is not properly treated.  Effort in reducing pollution level and recovery of metal in tailing could be conducted with biosorption process using microbial cell as an absorbent agent. This study aims to determine the ability of selected white rot fungi (WRF) immobilized on empty fruit bunches of oil palm (EFB)  to absorb Cu (II) metals in tailing. Based on growth rate, ligninolytic enzymes activity, and the absorption capacity of heavy metals, the superior WRF candidate was Omphalina sp. The ability of biomass Omphalina sp. to decrease the con-centrateion of Cu (II) with an initial concentration of 150 ppm, up to 63%. Omphalina sp. that immobilized on TKKS was able to reduce Cu (II) as much as 66-77% at pH 4.0 for 60 minutes. Abstrak                Eksploitasi tambang tembaga dan emas banyak menghasilkan limbah tailing yang masih me-ngandung logam berat seperti Cu (II) dan Hg (II). Limbah tersebut berpotensi mencemari perairan dan lahan pertanian bila tidak ditangani dengan baik.  Usaha untuk mengatasi limbah tailing dan sekaligus memekatkan (recovery) logam di dalam-nya dapat dilakukan dengan proses biosorpsi menggunakan sel mikroba. Penelitian ini bertujuan menetapkan kemampuan biomassa jamur pelapuk putih (JPP) yang diimobilisasi pada tandan kosong kelapa sawit (TKKS) dalam mengabsorpsi ion logam Cu (II). Metode biosorpsi logam yang digunakan dengan sistem batch dengan kadar logam 300 ppm, 200 ppm,dan 150 ppm. Hasil seleksi JPP berdasarkan laju pertumbuhan, aktivitas enzim ligninolitik, dan penyerapan logam berat telah  diperoleh   kandidat   JPP   unggul  yaitu Omphalina sp. Dalam media PDB,  Omphalina sp. toleran terhadap Cu (II) hingga konsentrasi 150 ppm. Kemampuan biomassa Omphalina sp. untuk penurunan konsentrasi Cu (II) dengan konsentrasi awal 150 ppm yaitu mencapai 63%. Omphalina sp. yang diimobilisasi dengan TKKS mampu menurun- kan kandungan Cu (II) sebesar 66-77%  pada pH 4.0 selama 60 menit. 

scholarly journals Absorption Capacity of Copper and Lead in the Case of Phragmites Australis Plant Species

2019 ◽  
Vol 70 (11) ◽  
pp. 4035-4039
Keyword(s):  
Heavy Metals ◽  
Plant Species ◽  
Phragmites Australis ◽  
Dry Matter ◽  
Absorption Capacity ◽  
Hydrographic Basin ◽  
Lead Absorption ◽  
Plant Samples ◽  
Copper Lead ◽  
High Absorption

The main objective of the current research is to determine the absorption capacity of heavy metals (copper and lead) in the case of Phragmites Australis plant species (root, stalk, leaf, flower). The plant samples was taken from the Moldova and Siret Rivers, belonging to the Siret hydrographic basin, respectively upstream of Roman city, Romania-Siret River, downstream Roman city -Moldova River, downstream confluence Moldova/Siret- Siret River and Dragesti-Siret River. A high absorption capacity of copper was recorded, in the case of Phragmites Australis plant species (especially in the root of the plant for all point analysed). A very higher absorption capacity of lead was recorded, in the flower, in the case of Phragmites Australis plant species (1.45÷39.56 mg/kg dry matter) for all point analysed. Keywords: copper, lead, absorption capacity, Phragmites Australis

Mathematical Modeling for the Absorption Capacity of Heavy Metals from the Soil in the Case of Phragmites Australis Plant Species

2019 ◽  
Vol 70 (7) ◽  
pp. 2545-2551
Author(s):  
Alexandra Dana Chitimus ◽  
Valentin Nedeff ◽  
Ion Sandu ◽  
Cristian Radu ◽  
Emilian Mosnegutu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Mathematical Model ◽  
Plant Species ◽  
Phragmites Australis ◽  
Mathematic Model ◽  
Absorption Capacity ◽  
Plant Samples ◽  
The Mathematical Model ◽  
Very High ◽  
High Absorption

This paper proposes a tridimensional mathematical model of the absorption capacity of heavy metals (cadmium and nickel) from the soil in the case of Phragmites Australis plant species (the soil and plant samples was taken from six locations/areas along the Bistri�a and Crac�u Rivers, belonging to the Siret hydrographic basin). The variable measures taken into consideration when carrying out the experiments and realizing the mathematical model are the distance from the water-soil interface from which the plant samples were taken and the concentration of the heavy metals in the soil. The mathematical model was elaborated and tested by means of the TableCurve 3D program used for generating linear and non-linear equations. A very high absorption capacity of cadmium from the soil was recorded A very high absorption capacity of cadmium from the soil was recorded, in the case of Phragmites Australis plant species (190�234 % higher than in the soil). The correlation coefficient of the mathematic model was between 0.90 and 0.98.

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