scholarly journals Activated Carbons for Arsenic Removal from Natural Waters and Wastewaters: A Review

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 2982
Author(s):  
Elie Meez ◽  
Athanasia K. Tolkou ◽  
Dimitrios A. Giannakoudakis ◽  
Ioannis A. Katsoyiannis ◽  
George Z. Kyzas
Keyword(s):  
Natural Waters ◽  
Arsenic Removal ◽  
Activated Carbons ◽  
Ph Value ◽  
Critical Role ◽  
Freundlich Isotherms ◽  
Removal Capacity ◽  
Characterization Of Materials ◽  
Removal Of Arsenic

The arsenic pollution of waters and wastewaters is concerning many countries across the world, and because of the effects of arsenic on human health, its removal from waters is of great importance. Adsorption using functionalized activated carbons as a technique for the removal of arsenic from water streams has gained great attention. In the present review, we summarize synthesis technologies, the characterization of materials and arsenic removal capacity, and we clarify the parameters which play a critical role in the removal of arsenic, such as the pH value of the water, the active group in the functionalization and temperature. The review article concludes that most of the experimental data fit both Langmuir and Freundlich isotherms. In this review, the recyclability and reuse of the materials are also reported, and the findings show that for both arsenite and arsenate, even after several adsorption cycles, the material can be further used as an efficient adsorbent for arsenic removal.

scholarly journals Possibility of Removing Phosphates from Activated Charbon Made from Date Kernels

2021 ◽  
Vol 06 (03) ◽  
Author(s):  
Nora Seghairi ◽  
Keyword(s):  
Activated Carbon ◽  
Natural Waters ◽  
Activated Carbons ◽  
Kinetic Studies ◽  
Phosphate Adsorption ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Isotherm Study ◽  
Freundlich Isotherms ◽  
Batch Tests

Phosphates in natural waters and whatever their origin, promote the formation of algae, reduce dissolved oxygen and reduce biodiversity in aquatic ecosystems. At high doses, phosphate salts can cause health problems. The objective of our study was to develop a simple, efficient and environmentally friendly sorption depollution technique on available and inexpensive media. We have studied the adsorption of phosphate on activated carbons prepared from date kernels. Batch tests were carried out in order to study different operating parameters such as the effect of contact time, pH, initial phosphate concentration and adsorbent dosage and adsorption kinetic. The sorption equilibrium was analyzed by Langmuir, Freundlich isotherms model. Results show that the phosphate adsorption was reversible and the quantity adsorbed reached its maximum value (14.49 mg/g) after 40 minutes. It was also found that phosphate uptake was affected by variation of pH, initial concentration of phosphate and activated carbon dosage. The adsorption improved with an acidic pH (pH = 6), initial concentration and adsorbent dosage. The results of kinetic studies revealed that adsorption phosphate on activated carbon based on date kernels (Biocar) and the intra-particle diffusion involved in the adsorption mechanism. Also, isotherm study showed that Langmuir isotherm best fit the data and the adsorption was a physical type.

scholarly journals Synthesis and Characterization of Pumice-Supported nZVI for Removal of Copper from Waters

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Bilgehan Ilker Harman ◽  
Mesut Genisoglu
Keyword(s):  
Surface Chemistry ◽  
Natural Waters ◽  
Water Source ◽  
Synthesis And Characterization ◽  
Characterization Methods ◽  
Ph Values ◽  
Surface Areas ◽  
Removal Capacity ◽  
Wide Range

The target of this work was to study the synthesis and characterization of pumice-supported nanoscale zero-valent iron (nZVI) and the effectiveness of nZVI coated pumice to remove copper from water. The impacts of pumice dose, pumice surface chemistry, pH, and water source on copper removal were studied. Natural pumice particles were used as granular support media and coated with nZVI. Results of nZVI coated pumice characterization showed nZVI coated successfully on pumice surface being proved with characterization methods such as SEM-EDS, XPS, and XRF. nZVI coating overwhelmed the surface chemistry properties of the underlying pumice particles. Higher surface areas and more iron content were obtained in nZVI coated pumice. nZVI coating significantly increased copper uptake compared to uncoated particles. High removal capacity has been observed for all tested pH values. Control experiments indicated that nZVI bound on pumice surfaces is stable at pH values of typical natural waters. The nZVI coated pumice was found to be effective in removing copper from waters having a wide range of specific UV absorbance (SUVA) values. Overall, the results indicated that nZVI coated pumice particles are maybe alternative adsorbents to remove copper.

scholarly journals Synthesis and Characterization of Hybrid-Magnetic Nanoparticles and Their Application for Removal of Arsenic from Groundwater

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Marta A. Bavio ◽  
Adriana G. Lista
Keyword(s):  
Carbon Nanotubes ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Arsenic Removal ◽  
Multiwall Carbon Nanotubes ◽  
Good Alternative ◽  
Multiwalled Carbon ◽  
Characterization Study ◽  
Removal Of Arsenic

Multiwall carbon nanotubes (MWCNTs) were oxidized with different agents and a characterization study was carried out. Then, hybrid-magnetic nanoparticles (HMNPs) were synthesized as iron oxide supported on the selected multiwalled carbon nanotubes (MWCNTs-Fe3O4) obtained from MWCNTs oxidized with HNO3. The HMNPs characterization revealed the presence of iron oxide as magnetite onto the MWCNTs surfaces. These HMNPs were used for arsenic removal from groundwater. The adsorption process variables were optimized (concentration of NPs, contact time, and pH), and these systems could remove 39.93 mg As/g adsorbent. Therefore, these nanoparticles appear as a good alternative for removing arsenic from water samples.

scholarly journals Development and Characterization of Iron Coated Chitosan Beads (ICCB) to remove Arsenic from Groundwater

2020 ◽  
pp. 156-161
Keyword(s):  
Drinking Water ◽  
Arsenic Removal ◽  
Anthropogenic Activities ◽  
Cost Effective ◽  
Safe Drinking Water ◽  
Chitosan Beads ◽  
Experimental Adsorption ◽  
The World ◽  
Removal Of Arsenic

The current situation of Pakistan is reaching to an alarming situation in the context of polluting water bodies as well as groundwater due to various natural and anthropogenic activities, which can be foreseen for shortage and unavailability of safe and healthy drinking water for the population. The greater part of Pakistani individuals (almost 60%) living underneath the neediness line so they don't move toward perfect and safe drinking water supplies. Arsenic is one of the hazardous metals presents in various territories of Pakistan as well as in various zones of the world. Its essence strokes individuals' wellbeing by sullying the water. This experimental adsorption study emphasizes on the arsenic removal from drinking water by utilizing cost-effective adsorbent called "Iron Coated Chitosan Beads (ICCB)". This technique is more useful and effective when contrasted with different removal methodologies to remove arsenic from groundwater. ICCB was utilized and it was discovered a compelling and productive adsorbent for the removal of arsenic from groundwater. From all clump tests, the removal level of arsenic is achieved from 79 % to 98%. These results demonstrated that ICCB can be utilized as a productive adsorbent material for the removal of arsenic from water.

Experimental Study of Coagulation Treatment of the Arsenic-Containing Rural Drinking Groundwater

2012 ◽  
Vol 610-613 ◽  
pp. 2197-2202
Author(s):  
Jing Liu ◽  
Hua Yang ◽  
Yan Zuo ◽  
Zhi Min Ren ◽  
De Jun Bian
Keyword(s):  
Experimental Study ◽  
Drinking Water ◽  
Room Temperature ◽  
Arsenic Removal ◽  
Ph Value ◽  
Experimental Results ◽  
Ph Values ◽  
Neutral Ph ◽  
Removal Of Arsenic ◽  
Sedimentation Time

The arsenic-containing rural drinking groundwater was treated by coagulation method in the paper. It was studied that the varieties and dosages of coagulants, pH value and sedimentation time have an effect on removal of arsenic. The experimental results indicated that the rate of arsenic removal is able to reach 95.6% at room temperature and under the condition of neutral pH values, 20 mg of Fe2(SO4)3 as coagulant and 1 h of sedimentation time. The content of arsenic in the treated drinking groundwater can be up to the current national hygiene standards of rural drinking water (<0.05mg /L).

Enrichment of arsenite oxidizing bacteria under autotrophic conditions and the isolation and characterization of facultative chemolithoautotrophic arsenite oxidizing bacteria for removal of arsenic from groundwater

2012 ◽  
Vol 12 (5) ◽  
pp. 707-714 ◽  
Author(s):  
L. Nguyen Ai ◽  
A. Sato ◽  
D. Inoue ◽  
K. Sei ◽  
S. Soda ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Enrichment Culture ◽  
Large Subunit ◽  
Cost Effective ◽  
Isolation And Characterization ◽  
The World ◽  
Genes Encoding ◽  
Arsenite Oxidizing Bacteria ◽  
Removal Of Arsenic

Arsenic contamination in groundwater has caused severe health problems throughout the world. Developing cost-effective processes for arsenic removal is an emerging issue. Because As(III) is predominant in groundwater and is more difficult to remove than As(V) is, oxidation of As(III) to As(V) is necessary to improve overall arsenic removal. This study was undertaken to enrich arsenite oxidizing bacteria under autotrophic conditions and to isolate and characterize facultative chemolithoautotrophic arsenite oxidizing bacteria (CAOs) that can oxidize As(III) effectively to As(V). An enrichment culture which adapted wide As(III) concentrations and completely oxidized 12 mM As(III) within 4 days under autotrophic conditions was established and maintained. Among 10 isolated strains, 6 strains, B1, B2, C, D, E1 and E2 belonging to β-Proteobacteria, were facultative CAOs and contained aoxB genes encoding the arsenite oxidase large subunit. Furthermore, they displayed various As(III) oxidation capabilities: B1, B2, E1 and E2 efficiently oxidized 1–10 mM As(III). The others showed efficient oxidation at 1–5 mM As(III), suggesting the coexistence of facultative CAOs with various As(III) oxidation capabilities in the enrichment. These results suggest that constructed enrichment and strains B1, B2, E1 and E2 can be useful for the bioremediation of arsenic-contaminated groundwater.

scholarly journals Preparation of activated charcoal adsorbent from waste tire

2012 ◽  
Vol 10 (10) ◽  
pp. 80-83 ◽  
Author(s):  
Drona Raj Barai ◽  
Vinay Kumar Jha
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Activated Charcoal ◽  
Activated Carbons ◽  
Freundlich Isotherms ◽  
Waste Tire ◽  
Scientific World ◽  
Langmuir And Freundlich Isotherms ◽  
Pseudo Second Order

Activated carbons were prepared from waste tire in two different routes. Some physical properties of thus prepared activated carbons were measured and the characterization of their phases was done by XRD measurement. The adsorption isotherms of methylene blue were simulated by the Langmuir and Freundlich isotherms. The Langmuir isotherms were found to have better fitting with Qmax values 0.227, 0.255 and 0.256 mmol/g for the activated carbons prepared in air, nitrogen, nitrogen and steam respectively while it was 0.275 mmol/g for activated carbon impregnated with H3 PO4 . The overall reaction was found to be pseudo-second order with the rate constant of 8.314 × 10-4 Lg/(mmolmin). The surface area of the best prepared activated carbon was 334.2 m2 /g. Scientific World, Vol. 10, No. 10, July 2012 p80-83 DOI: http://dx.doi.org/10.3126/sw.v10i10.6868

Preparation of Mn-Fe Binary Oxide for Arsenic Removal from Aqueous Solution

2013 ◽  
Vol 800 ◽  
pp. 597-600
Author(s):  
Mei Xue ◽  
Ting Ting Liu ◽  
Fei Cao
Keyword(s):  
Aqueous Solution ◽  
Drinking Water ◽  
Arsenic Removal ◽  
Ph Value ◽  
Binary Oxide ◽  
Synthesis Condition ◽  
Adsorption Removal ◽  
Contaminated Drinking Water ◽  
Arsenite Removal ◽  
Removal Of Arsenic

Adsorption removal of arsenic from contaminated drinking water was carried out by using Mn-Fe binary oxide adsorbent. Main phase of adsorbents was influenced by pH value of solution, and pH of 10 is the suitable synthesis condition to achieve the Mn-Fe binary oxide suspension adsorbents. Adsorbents with Mn/Fe mole ratio from 6/4 to 2/8 exhibits higher arsenite removal larger than 99.6%.

scholarly journals Adsorptive Removal of Arsenic by Synthetic Iron-loaded Goethite: Isotherms, Kinetics, and Mechanism

2021 ◽  
Author(s):  
Shakeel Ahmed Talpur ◽  
Muhammad Yousuf Jat Baloch ◽  
Chunli Su ◽  
Javed Iqbal ◽  
Aziz Ahmed
Keyword(s):  
Binding Sites ◽  
Arsenic Removal ◽  
Binding Energies ◽  
Coefficient Of Determination ◽  
Maximum Adsorption Capacity ◽  
Surface Binding ◽  
Arsenic Adsorption ◽  
Freundlich Isotherms ◽  
Best Fitting ◽  
Removal Of Arsenic

Abstract Arsenic contamination in the groundwater is a worldwide concern. Therefore, this study was designed to use synthetic iron-loaded goethite to remove arsenic. Adsorption was significantly pH-dependent; hence, pH values between 5.0 and 7.0 resulted in the highest removal of arsenate and arsenite. Langmuir and Freundlich isotherms were almost perfectly matched in terms of strong positive coefficient of determination “R2” arsenate – 0.941 and 0.992 and arsenite – 0.945 and 0.993. The adsorption intensity “n” resulted as arsenate – 2.542 and arsenite – 2.707; besides separation factor “RL” found as arsenate – 0.1 and arsenite – 0.5, respectively. However, both “n” and “RL” leads to a favourable adsorption process. Temkin isotherm yielded in equal binding energies “bt” showing as 0.004 (J/μg) for both arsenate and arsenite. Jovanovic monolayers isotherm was dominated by the Langmuir isotherm. This resulting in maximum adsorption capacity “Qmax” of arsenate – 1369.877 and arsenite – 1276.742 (μg/g), which approaches to the saturated binding sites. Kinetic data revealed that adsorption equilibrium was achieved in 240 – arsenate and 360 – arsenite (minutes), respectively. Chemisorption was found effective with high “R2” values 0.981 ­– arsenate and 0.994 – arsenite, respectively, with the best fitting of pseudo-second order. Moreover, Brunauer Emmett Teller (BET), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR) were used to determine the morphological content, surface area, crystalline structure, and chemical characteristics of the adsorbent. It is anticipated that optimal arsenic removal was achieved by the porosity, chemical bindings, and surface binding sites of the adsorbent.

Synthesis and characterization of RGO/zeolite composites for the removal of arsenic from contaminated water

RSC Advances ◽  
2015 ◽  
Vol 5 (45) ◽  
pp. 35352-35360 ◽  
Author(s):  
M. Khatamian ◽  
N. Khodakarampoor ◽  
M. Saket Oskoui ◽  
N. Kazemian
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Arsenic Removal ◽  
Synthesis And Characterization ◽  
Contaminated Water ◽  
The Novel ◽  
Zeolite A ◽  
Reduced Graphene ◽  
Removal Of Arsenic

The novel composite RGO/Cu-ZEA (1 : 1) (prepared from reduced graphene oxide (RGO) and Cu-exchanged zeolite A) revealed the highest efficiency for arsenic removal from contaminated water.

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