scholarly journals Study on the modification of Phu Yen diatomite by mixed Fe-Mn oxide and the use of the modified material as an arsenic removal adsorbent in water environment

2021 ◽  
Vol 10 (1) ◽  
pp. 13-20
Author(s):  
Thien Tran Vinh ◽  
Tu Nguyen Thi Thanh ◽  
Son Bui Hai Dang
Keyword(s):  
Adsorption Capacity ◽  
Arsenic Removal ◽  
Water Environment ◽  
Surface Characteristics ◽  
Reduction Reaction ◽  
Arsenic Adsorption ◽  
Solution Ph ◽  
Mn Oxide ◽  
Oxidation Reduction ◽  
Modified Diatomite

The paper presents the modification of Phu Yen diatomite by oxidation-reduction reaction between Fe (II) and KMnO4 salts in solution pH = 6 on the diatomite surface. Characteristics of modified materials and the influence of research factors on these characteristics were investigated using techniques XRD, EDX, XPS, SEM, TEM, BET. Arsenic adsorption capacity of modified materials, the influence of environmental factors on the adsorption capacity were also investigated and evaluated. The results showed that mixed oxide-modified diatomite has higher arsenic adsorption capacity than natural diatomite and modified diatomite by individual oxides.

Binary Fe and Mn Oxide Nanoparticle Supported Polymeric Anion Exchanger for Arsenic Adsorption: Role of Oxides, Supported Materials, and Preparation Solvent

2016 ◽  
Vol 718 ◽  
pp. 105-109 ◽  
Author(s):  
Antika Pranudta ◽  
Pornsawai Praipipat ◽  
Medhat Mohamed El-Moselhy ◽  
Surapol Padungthon
Keyword(s):  
Anion Exchange ◽  
Arsenic Removal ◽  
Point Of Zero Charge ◽  
Synthesis Process ◽  
Mixed Solution ◽  
Arsenic Adsorption ◽  
Solution Ph ◽  
Mn Oxide ◽  
The Matrix ◽  
Process Effects

In this work, binary Fe/Mn oxide nanoparticles were incorporated onto the matrix of anion exchange resin, resulting in hybrid polymeric/inorganic nanoadsorbent named as A502P-Fe/Mn. During synthesis process, effects of various types of metal oxides, preparation solvent, supporting materials, and loading cycles were also investigated. To reduce the charge repulsion force between cationic Fe3+ and Mn4+ ions and fixed-positively charged quaternary amine (R4N+) functional groups of the anion exchange support, mixed solution containing DI/ethanol was introduced to dissolve metal salts during the preparation process. The data obtained by equilibrium batch test indicated that the A502P-Fe/Mn prepared from mixed 50:50 of DI and ethanol exhibited the highest As (V) sorption capacity. The synthesized material was further characterized by using scanning electron microscope (SEM) equipped with energy dispersive X ray spectroscopy (EDX) to verify the existence and distribution of elemental Fe, Mn, and As inside the polymeric beads. Equilibrium As (V) sorption isotherm, effect of solution pH, and point of zero charge of material were also evaluated. This A502P-Fe/Mn can have a promising potential for arsenic removal applications.

scholarly journals Study on arsenic removal process from water

2014 ◽  
Vol 12 ◽  
pp. 53-55
Author(s):  
B Bayarmaa ◽  
E Selenge ◽  
Yang Min
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Adsorption Capacity ◽  
Ferric Oxide ◽  
Arsenic Removal ◽  
Ph Dependence ◽  
Surface Characteristics ◽  
Arsenic Adsorption ◽  
Ferric Oxides ◽  
The Relationship

In this study a novel adsorbent, iron oxide, is used for As (V) or As (III) removal. Some ferric oxides have been reported to be effective for arsenic removal. Ferric oxides powder is a good adsorbent material since it’s has magnetic properties and a good adsorption capacity. The main purpose of this study has been focused on to study the relationship between adsorption capacity (ability, performance) and the surface characteristics of the ferric oxide. Prepared sample’s capacity was evaluated. The value was 26.1-67.4 mg/g for As (V) and 20.5-47.8 mg/g for As (III). pH dependence was evaluated and when pH increasing, adsorption capacity was decreased. The kinetic was evaluated and about 12 hours reached equilibrium and a capacity of 49 mg/g for As (V) and 42 mg/g for As(III) was gained. The kinetic constants for arsenic adsorption on the ferrihydrite adsorbent’s were fitted.DOI: http://dx.doi.org/10.5564/mjc.v12i0.172 Mongolian Journal of Chemistry Vol.12 2011: 53-55

scholarly journals Dynamic desorption of arsenic from polymer-supported hydrated iron(III) oxide in a wastewater treatment plant

2017 ◽  
Vol 76 (9) ◽  
pp. 2380-2388 ◽  
Author(s):  
Jian-Long Hu ◽  
Xiao-Song Yang ◽  
Ting Liu ◽  
Li-Nan Shao ◽  
Wang Zhang
Keyword(s):  
Wastewater Treatment ◽  
Adsorption Capacity ◽  
Wastewater Treatment Plant ◽  
Arsenic Removal ◽  
Treatment Plant ◽  
Arsenic Adsorption ◽  
Wastewater Treatment Process ◽  
Long Time ◽  
Naoh Solution ◽  
Polymer Supported

Abstract Polymer-supported hydrated iron(III) oxide (PHIO) was successfully applied as adsorbent for arsenic removal in a wastewater treatment plant in Nandan, China. The practical PHIO adsorbent samples (PHIO-P) were collected from the adsorption column of the wastewater treatment plant, and desorption experiments of the adsorbent were carried out. Our results showed that the formation of precipitates on the surface of PHIO-P might block the porous channel of the adsorbent and decrease its arsenic adsorption capacity. In the dynamic arsenic desorption experiment, the arsenic desorption equilibrium was achieved more quickly at decreasing desorption velocity, and higher arsenic desorption efficiency was obtained at increasing NaOH concentration in regenerant. It was found that the PHIO-P adsorbent could be well regenerated at 1.0 M NaOH solution and desorption velocity of 5 BV h−1. Comparing with the raw adsorbent, the maximum arsenic adsorption capacity of PHIO-P decreased by 41.1% after practical running for 26 months. Additionally, the frequently used waste PHIO adsorbent could be treated as non-hazardous material in the arsenic-containing wastewater treatment process after long-time use.

ARSENIC ADSORPTION FROM WATER USING GRAPHENE-BASED MATERIALS AS ADSORBENTS: A CRITICAL REVIEW

2016 ◽  
Vol 24 (01) ◽  
pp. 1730001 ◽  
Author(s):  
XUETONG YANG ◽  
LING XIA ◽  
SHAOXIAN SONG
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Arsenic Removal ◽  
Surface Complexation ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Large Specific Surface Area ◽  
Arsenic Adsorption ◽  
Adsorption Mechanisms ◽  
Adsorption Performance

Adsorption is widely applied to remove arsenic from water. This paper reviewed and compared the recent progresses on the arsenic removal by adsorption using two-dimensional and three-dimensional graphene-based materials as adsorbents. Functional graphene sheet achieved the largest As(III) adsorption capacity of 138.79[Formula: see text]mg/g, while Mg-Al LDH/GO2 showed the largest As(V) adsorption capacity of 183.11[Formula: see text]mg/g. Parameters including pH, temperature, co-existing ions and loaded metal or metal oxide affected the adsorption process. The adsorption mechanisms of graphene-based materials for As(III) and As(V) could be explained by surface complexation and the electrostatic attraction, respectively. Future works are suggested to focus on regenerating of two-dimensional graphene-based adsorbents and developing the three-dimensional with large specific surface area and better adsorption performance.

scholarly journals Arsenic Removal from Mining Effluents Using Plant-Mediated, Green-Synthesized Iron Nanoparticles

Processes ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 759 ◽  
Author(s):  
Karimi ◽  
Javanshir ◽  
Sayadi ◽  
Arabyarmohammadi
Keyword(s):  
Iron Nanoparticles ◽  
Arsenic Removal ◽  
Surface Characteristics ◽  
Isotherm Models ◽  
Aqueous Environment ◽  
Temperature Sensitive ◽  
Agitation Rate ◽  
Arsenic Adsorption ◽  
Microscopy Imaging ◽  
Teucrium Polium

Arsenic contamination in industrial and mining effluents has always been a serious concern. Recently, nano-sized iron particles have been proven effective in sorptive removal of arsenic, because of their unique surface characteristics. In this study, green synthesis of iron nanoparticles was performed using a mixed extract of two plant species, namely Prangos ferulacea and Teucrium polium, for the specific purpose of arsenic (III) removal from the aqueous environment. Results of UV-visible spectrometry, X-ray powder diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR) analyses confirmed the formation of iron nanoparticles from Prangos ferulacea (Pf) and Teucrium polium (Tp) extracts. The synthesized Fe nanoparticles morphology was studied via microscopy imaging. The particle size was 42 nm, as assessed by dynamic light scattering (DLS) analysis. Adsorption experiments were also designed and performed, which indicated 93.8% arsenic removal from the aqueous solution at 200 rpm agitation rate, 20 min agitation time, pH 6, initial concentration of 0.1 g/L, and adsorbent dosage of 2 g/L. Adsorption isotherm models were investigated, and the maximum uptake capacity was determined to be about 61.7 mg/g. The kinetic data were best represented by the pseudo-second kinetic model (R2 = 0.99). The negative value of Gibbs free energy, the enthalpy (−7.20 kJ/mol), and the entropy (−57 J/mol.K) revealed the spontaneous and exothermic nature of the adsorption process. Moreover, the small quantity of the activation energy confirmed the physical mechanism of arsenic adsorption onto iron nanoparticles and that the process is not temperature sensitive.

scholarly journals Fe-FeS2 adsorbent prepared with iron powder and pyrite by facile ball milling and its application for arsenic removal

2017 ◽  
Vol 76 (1) ◽  
pp. 192-200 ◽  
Author(s):  
Xiaobo Min ◽  
Yangwenjun Li ◽  
Yong Ke ◽  
Meiqing Shi ◽  
Liyuan Chai ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Ball Milling ◽  
Photoelectron Spectroscopy ◽  
Arsenic Removal ◽  
Molar Ratio ◽  
Arsenic Adsorption ◽  
Arsenic Uptake ◽  
X Ray ◽  
Before And After ◽  
High Arsenic

Arsenic is one of the major pollutants and a worldwide concern because of its toxicity and chronic effects on human health. An adsorbent of Fe-FeS2 mixture for effective arsenic removal was successfully prepared by mechanical ball milling. The products before and after arsenic adsorption were characterized with scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The adsorbent shows high arsenic removal efficiency when molar ratio of iron to pyrite is 5:5. The experimental data of As(III) adsorption are fitted well with the Langmuir isotherm model with a maximal adsorption capacity of 101.123 mg/g. And As(V) data were described perfectly by the Freundlich model with a maximal adsorption capacity of 58.341 L/mg. As(III) is partial oxidized to As(V) during the adsorption process. High arsenic uptake capability and cost-effectiveness of waste make it potentially attractive for arsenic removal.

Facile approach for synthesis of stable, efficient, and recyclable ZnO through pulsed sonication and its application for degradation of recalcitrant azo dyes in wastewater

2018 ◽  
Vol 96 (10) ◽  
pp. 897-905 ◽  
Author(s):  
G. Kumaravel Dinesh ◽  
Rameshkumar Saranya
Keyword(s):  
Oxygen Demand ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
Hexagonal Structure ◽  
Bet Surface Area ◽  
Catalyst Loading ◽  
Pulsed Ultrasound ◽  
Solution Ph ◽  
Oxidation Reduction ◽  
Cyclic Degradation

In the present study, the ultrasound in pulsed mode was used as a part of an advanced oxidation method. The influence of the pulsed ultrasound mode for the preparation of the zinc oxide (ZnO) wurtzite nanoparticle was investigated. The catalysts synthesized were analysed using SEM, TEM, EDAX, BET surface area, XRD, and DRS to study their morphological and structural characterizations. The ZnO nanoparticles exhibited a highly hexagonal structure from pulsed sonication synthesis route. The efficiency of the decolourization of the reactive red 4 (RR4) dye was studied under different operation parameters such as dye concentration, initial solution pH, oxidant (e.g., H2O2) concentration, and catalyst loading. The hybrid combined process of pulsed sonolysis, pH (4.0), H2O2 (17.64 mmol), and catalyst (0.35 g/L) achieved 97% degradation and 87.5% chemical oxygen demand removal in about 20 min of reaction time. The cyclic degradation studies of RR4 removal with 0.35 g/L of ZnO showed the reusability of catalyst up to the fifth removal cycle with negligible loss in the catalytic performance. GC–MS study, used for the detection of the RR4 intermediates, revealed the oxidation–reduction reaction by the reactive radicals proceeded via the reductive cleavage of the azo bonds. The studied process, based on the pulsed ultrasound, is found to be effective for the degradation of RR4 dye.

scholarly journals High Selectivity and Reusability of Biomass-Based Adsorbent for Chloramphenicol Removal

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2950
Author(s):  
Weinan Xing ◽  
Qi Liu ◽  
Jingyi Wang ◽  
Siye Xia ◽  
Li Ma ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Solution Structure ◽  
Low Cost ◽  
Water Environment ◽  
Significant Loss ◽  
Order Kinetic ◽  
Solution Ph ◽  
Suitable Material ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Recently, biomass-based materials have attracted increasing attention because of their advantages of low cost, environment-friendly and nonpollution. Herein, the feasibility of using corn stalk biomass fiber (CF) and Fe3O4 embedded chitosan (CS) as a novel biomass-based adsorbent (CFS) to remove chloramphenicol (CAPC) from aqueous solution. Structure of CFS was characterized by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM) and zeta potential techniques. The effects of solution pH, adsorption time and ion strength on the adsorption capacity were examined. Adsorption isotherms obtained from batch experiments were better fitted by Langmuir model compared with Freundlich model, Dubinin–Radushkevich model and Temkin model. Adsorption kinetic data matched well to the pseudo-second order kinetic model. CAPC adsorption was endothermic, spontaneous, and entropy-increasing nature on CFS. In addition, the CFS could be separated by an external magnetic field, recycled, and reused without any significant loss in the adsorption capacity of CAPC. Based on these excellent performances, there is potential that CFS can be considered as a proficient and economically suitable material for the CAPC removal from the water environment.

scholarly journals Novel Design of Amine and Metal Hydroxide Functional Group Modified Onto Sludge Biochar for Arsenic Removal

2021 ◽  
Author(s):  
Chih-Kuei Chen ◽  
Nhat-Thien Nguyen ◽  
Thuy-Trang Le ◽  
Cong-Chinh Duong ◽  
Cong-Nguyen Nguyen ◽  
...  
Keyword(s):  
Density Functional ◽  
Arsenic Removal ◽  
Operating Cost ◽  
Adsorption Efficiency ◽  
Arsenic Adsorption ◽  
Adsorption Method ◽  
Simple Method ◽  
Electrostatic Adsorption ◽  
Operation Conditions ◽  
Oxidation Reduction

Abstract Among the arsenic removal technologies, the adsorption method is found to be an efficient, inexpensive and simple method with obvious advantages and application value for arsenic removal in water. While, each method has its limitations, the traditional adsorption method used for arsenic removal due to its high operating cost and low adsorption efficiency. Consequently, this study explicitly designed sludge biochar (SB) adsorbed for arsenic removal with lower operation costs and higher adsorption efficiency properties. Generally, biochar only relies on micropores for pollutant adsorption, but physical adsorption is not highly efficient for arsenic removal. Therefore, in order to improve the removal efficiency of arsenic by SB, diethylenetriamine (DETA) and FeCl3 were used in this study to modify the surface of SB by an immersion method. The modified SB has not only pore adsorption characteristics but also electrostatic adsorption, oxidation-reduction and complexation characteristics. The objectives of this research are to obtain optimum operation conditions by assessing the effect of different Fe content, pH and initial concentration on adsorbing arsenic. The arsenic adsorption mechanism on SB was studied using Density Functional Theory (DFT) to understand the functional effect on arsenic adsorption. Results showed the presence of amine and iron oxyhydroxides functional greatly promoted SB surface activity and its arsenic adsorption potential. DFT model result is the same as the result of arsenic adsorption performance with the high adsorption energy. The reaction mechanism is divided into four pathways, including oxidation-reduction, complexation, electrostatic adsorption and pore adsorption.

As(III) Removal by Dynamic Adsorption onto Amberlite XAD7 Functionalized with Crown Ether and Doped with Fe(III) Ions

2019 ◽  
Vol 70 (7) ◽  
pp. 2330-2334
Author(s):  
Mihaela Ciopec ◽  
Adina Negrea ◽  
Narcis Duteanu ◽  
Corneliu Mircea Davidescu ◽  
Iosif Hulka ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Fixed Bed ◽  
World Health ◽  
Arsenic Content ◽  
Arsenic Adsorption ◽  
Stage Of Development ◽  
Wide Range ◽  
Health Organization

Arsenic content in groundwater�s present a wide range of concentration, ranging from hundreds of micrograms to thousands of micrograms of arsenic per litter, while the maximum permitted arsenic concentration established by World Health Organization (WHO) is 10 mg L-1. According to the WHO all people, regardless of their stage of development and their social economic condition, have the right to have access to adequate drinking water. The most efficient and economic technique used for arsenic removal is represented by adsorption. In order to make this remediation technique more affordable and environmentally friendly is important to new materials with advance adsorbent properties. Novelty of present paper is represented by the usage of a new adsorbent material obtained by physical - chemical modification of Amberlite XAD polymers using crown ethers followed by iron doping, due to well-known affinity of arsenic for iron ions. Present paper aims to test the obtained modified Amberlite polymer for arsenic removal from real groundwater by using adsorption in a fixed bed column, establishing in this way a mechanism for the adsorption process. During experimental work was studied the influence of competing ions from real water into the arsenic adsorption process.

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