scholarly journals Removal of Heavy Metals Using Adsorption Processes Subject to an External Magnetic Field

Heavy Metals ◽  
2018 ◽  
Author(s):  
Ma. del Rosario Moreno Virgen ◽  
Omar Francisco González Vázquez ◽  
Virginia Hernández Montoya ◽  
Rigoberto Tovar Gómez
Keyword(s):  
Magnetic Field ◽  
Heavy Metals ◽  
External Magnetic Field ◽  
Removal Of Heavy Metals ◽  
Adsorption Processes

Derivation of Optimum Study Factors for Samples Contaminated with Cd Using Electric/Magnetic Field and ORP

2013 ◽  
Vol 813 ◽  
pp. 519-524
Author(s):  
Sang An Ha ◽  
Jei Pil Wang
Keyword(s):  
Magnetic Field ◽  
Heavy Metals ◽  
Removal Rate ◽  
Underground Water ◽  
Liquid Electrode ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Removal Of Heavy Metals ◽  
High Removal Rate ◽  
Membrane Treatment

A purpose of the present study is to derive optimum study factors for removal of heavy metals using combined alternating current electric/magnetic field and electric membranes for the area contaminated with heavy metals in soil or underground water. ORP (Oxidation Reduction Potential) analysis was conducted to determine an intensity of tendency for oxidation or reduction of the samples contaminated with heavy metals, and electrical membrane treatment was used with adjustment of concentrations and voltages of liquid electrode (Na2SO4) to derive a high removal rate. Removal constants were analyzed to be 0.0417, 0.119, 0.1594 when the voltages were 5V, 10V, 15V, respectively, and treatment efficiency was shown to increase as the liquid electrode concentration was increased. Keywords: heavy metals, electric/magnetic field, ORP, electrical membrane

scholarly journals Performance evaluation of ceramic pot filters combined with adsorption processes for the removal of heavy metals and phenolic compounds

2021 ◽  
Author(s):  
Andrea Pérez-Vidal ◽  
Jorge Antonio Silva-Leal ◽  
Jaime Diaz-Gómez ◽  
Camilo J. Meneses-Torres ◽  
Juan E. Arias-Vallejo ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Phenolic Compounds ◽  
Chemical Compounds ◽  
Colloidal Silver ◽  
Household Water Treatment ◽  
Chemical Contaminants ◽  
Household Level ◽  
Household Water ◽  
Removal Of Heavy Metals ◽  
Adsorption Processes

Abstract It has been demonstrated that the ceramic pot filters (CPFs) with impregnated colloidal silver are efficient for the removal of turbidity and pathogens for household water treatment. This investigation evaluated the efficiency of two filter models for the removal of chemical contaminants (Hg, Pb, As and phenolic compounds) during 175 days. The first model is a traditional CPF impregnated with colloidal silver and the second consists of the ceramic silver-impregnated pot plus a post-filtration column with granular activated carbon and zeolite (CPF + GAC-Z). The results of the CPF showed average efficiencies of 91.5% (Hg), 92% (Pb), 50.2% (As) and 78.7% (phenols). The CPF + GAC-Z showed similar efficiencies for the removal of heavy metals (92.5% Hg, 98.1% Pb and 52.3% As) and a considerably higher efficiency for the removal of phenols (96.4%). The As concentration of the filtered water in both systems was higher than the regulatory limit. The ceramic pot was responsible for the highest removal of chemical compounds. It can be concluded that the traditional CPF is a viable option for water supply treatment at the household level for the removal of chemical contaminants. The efficiency of this filter can be improved with the post-filtration column mainly for the removal of organic constituents.

scholarly journals Removal of Heavy Metals from Wastewater by Adsorption

2021 ◽  
Author(s):  
Athar Hussain ◽  
Sangeeta Madan ◽  
Richa Madan
Keyword(s):  
Heavy Metals ◽  
Metal Removal ◽  
Negative Impact ◽  
Low Cost ◽  
Agricultural Waste ◽  
Heavy Metal Removal ◽  
Raw Material ◽  
Removal Of Heavy Metals ◽  
Cost Effective Technique ◽  
Adsorption Processes

Adsorption processes are extensively used in wastewater treatment for heavy metal removal. The most widely used adsorbent is activated carbon giving the best of results but it’s high cost limits its use. It has a high cost of production and regeneration. As the world today faces a shortage of freshwater resources, it is inevitable to look for alternatives that lessen the burden on existing resources. Also, heavy metals are toxic even in trace concentrations, so an environmentally safe method of their removal necessitated the requirement of low cost adsorbents. Adsorption is a cost-effective technique and gained recognition due to its minimum waste disposal advantage. This chapter focuses on the process of adsorption and the types of adsorbent available today. It also encompasses the low-cost adsorbents ranging from agricultural waste to industrial waste explaining the adsorption reaction condition. The cost-effectiveness, technical applicability and easy availability of raw material with low negative impact on the system are the precursors in selecting the adsorbents. The novelty of the chapter lies in covering a wide range of adsorbents with their efficiency in removal of heavy metals from wastewater.

Effect of an external magnetic field applied in batch adsorption systems: Removal of dyes and heavy metals in binary solutions

2018 ◽  
Vol 269 ◽  
pp. 450-460 ◽  
Author(s):  
S.L. Flores López ◽  
M.R. Moreno Virgen ◽  
V. Hernández Montoya ◽  
M.A. Montes Morán ◽  
R. Tovar Gómez ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heavy Metals ◽  
External Magnetic Field ◽  
Batch Adsorption ◽  
Binary Solutions ◽  
Adsorption Systems

Application of Coconut Copra as Biosorbent for Removal of Heavy Metals

2019 ◽  
Vol 797 ◽  
pp. 3-12 ◽  
Author(s):  
Terri Zhuan Ean Lee ◽  
Siong Fong Sim
Keyword(s):  
Heavy Metals ◽  
Response Surface ◽  
Physical Adsorption ◽  
Equilibrium Phase ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Surface Models ◽  
Removal Of Heavy Metals ◽  
Adsorption Processes ◽  
Cr Removal

Previous studies have evidenced that coconut copra is a potential biosorbent for removal of dissolved organic carbon from peat swamp runoff attaining an average removal of 96 %. The capability of coconut copra in removing heavy metals including cadmium (Cd), chromium (Cr) and nickel (Ni) is scarcely reported. In this paper, response surface methodology was applied to evaluate the optimum conditions for removal of Cd, Cr and Ni from aqueous solution using raw coconut copra. Batch adsorption experiments were conducted according to inscribed central composite design. Response surface models further identified the optimum dosage, pH and contact time for Cd removal is 1.5 g, pH 11 and 60 min, Cr removal is 0.1 g, pH 8.48 and 60 min while Ni removal is 0.1 g, pH 11 and 15 min. Bimodality is observed in response surface graphs, implying the possible existence of two equilibrium phase during the adsorption process. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models were employed to describe the adsorption behaviour. Results revealed that raw coconut copra can remove 4.55 mg/g of Cd, 8.71 mg/g of Cr and 26.46 mg/g of Ni. The adsorption processes are physical adsorption.

scholarly journals Effect of the strong magnetic field on copper adsorption processes on activated carbon

2017 ◽  
Vol 8 (2) ◽  
pp. 7-10 ◽  
Author(s):  
Krzysztof Rajczykowski ◽  
Krzysztof Loska
Keyword(s):  
Magnetic Field ◽  
Activated Carbon ◽  
External Magnetic Field ◽  
Adsorption Process ◽  
Equilibrium Concentration ◽  
Process Efficiency ◽  
Effect Of Temperature ◽  
Copper Adsorption ◽  
Adsorption Processes ◽  
The Magnetic Field

In the presented studies an influence of the strong static magnetic field on the process of copper adsorption on activated carbon was analysed. The magnetic field was generated by the annular neodymium magnets, placed at the bottom of the glass reactors, with the magnetic induction value at the surface equal 0.517 T. Additionally, during the study an effect of temperature on the adsorption process efficiency and its susceptibility to the external magnetic field was also investigated. As a result of the study, it was found that using a magnetic modification can increase the efficiency of the adsorption process up to 80%. However, such a strong influence of the external magnetic field was observed only in the case of relatively low initial and equilibrium concentration of the adsorbate. With the increase of the equilibrium concentration, stimulating nature of the magnetic field weakened significantly until finally at an equilibrium concentration about 80 mg/dm3, it was almost negligible. In addition, it was also found that the magnetic field modifications were much more efficient if the adsorption processes were conducted at the higher temperature.

Removal of heavy metals (Cr, Cu and Zn) from electroplating wastewater by electrocoagulation and adsorption processes

2020 ◽  
Vol 179 ◽  
pp. 263-271 ◽  
Author(s):  
Sohail Ayub ◽  
Asif Ali Siddique ◽  
Md. S. Khursheed ◽  
Ahmad Zarei ◽  
Izhar Alam ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Electroplating Wastewater ◽  
Removal Of Heavy Metals ◽  
Adsorption Processes ◽  
Cu And Zn

scholarly journals Synthesis and Characterization of Amorphous Iron Oxide Nanoparticles by the Sonochemical Method and Their Application for the Remediation of Heavy Metals from Wastewater

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1551
Author(s):  
Virendra Kumar Yadav ◽  
Daoud Ali ◽  
Samreen Heena Khan ◽  
Govindhan Gnanamoorthy ◽  
Nisha Choudhary ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Heavy Metals ◽  
Iron Oxide ◽  
Fly Ash ◽  
External Magnetic Field ◽  
Iron Oxide Nanoparticles ◽  
Batch Adsorption ◽  
Oxide Nanoparticles ◽  
Sonochemical Method

Nanoparticles have gained huge attention in the last decade due to their applications in electronics, medicine, and environmental clean-up. Iron oxide nanoparticles (IONPs) are widely used for the wastewater treatment due to their recyclable nature and easy manipulation by an external magnetic field. Here, in the present research work, iron oxide nanoparticles were synthesized by the sonochemical method by using precursors of ferrous sulfate and ferric chloride at 70 °C for one hour in an ultrasonicator. The synthesized iron oxide nanoparticles were characterized by diffraction light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), electron diffraction spectroscopy (EDS), high-resolution transmission electron microscopy (HRTEM) and vibrating sample magnetometer (VSM). The FTIR analysis exhibits characteristic absorption bands of IONPs at 400–800 cm−1, while the Raman spectra showed three characteristic bands at 273, 675, and 1379 cm−1 for the synthesized IONPs. The XRD data revealed three major intensity peaks at two theta, 33°, 35°, and 64° which indicated the presence of maghemite and magnetite phase. The size of the spherical shaped IONPs was varying from 9–70 nm with an average size of 38.9 nm while the size of cuboidal shaped particle size was in microns. The purity of the synthesized IONPs was confirmed by the EDS attached to the FESEM, which clearly show sharp peaks for Fe and O, while the magnetic behavior of the IONPs was confirmed by the VSM measurement and the magnetization was 2.43 emu/g. The batch adsorption study of lead (Pb) and chromium (Cr) from 20% fly ash aqueous solutions was carried out by using 0.6 mg/100 mL IONPs, which exhibited maximum removal efficiency i.e., 97.96% and 82.8% for Pb2+ and Cr ions, respectively. The fly ash are being used in making cements, tiles, bricks, bio fertilizers etc., where the presence of fly ash is undesired property which has to be either removed or will be brought up to the value of acceptable level in the fly ash. Therefore, the synthesized IONPs, can be applied in the elimination of heavy metals and other undesired elements from fly ash with a short period of time. Moreover, the IONPs that have been used as a nanoadsorbent can be recovered from the reaction mixture by applying an external magnetic field that can be recycled and reused. Therefore, this study can be effective in all the fly ash-based industries for elimination of the undesired elements, while recyclability and reusable nature of IONPs will make the whole adsorption or elimination process much economical.

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