Removal of Arsenic in Drinking Water by Iron Oxide-Coated Sand and Ferrihydrite — Batch Studies

2001 ◽  
Vol 36 (1) ◽  
pp. 55-70 ◽  
Author(s):  
O.S. Thirunavukkarasu ◽  
T. Viraraghavan ◽  
K.S. Subramanian
Keyword(s):  
Drinking Water ◽  
Iron Oxide ◽  
Natural Water ◽  
Arsenic Concentration ◽  
Arsenic Species ◽  
Arsenic Adsorption ◽  
Batch Studies ◽  
Treatment Processes ◽  
Coated Sand ◽  
Removal Of Arsenic

Abstract Arsenic, a common toxic element is mainly transported in the environment by water. Arsenic in drinking water is of major concern to many of the water utilities in the world. Numerous studies have examined the removal of arsenic from drinking water through treatment processes such as coagulation-precipitation, reverse osmosis and ion exchange. The focus of research has now shifted to solve the problems using suitable adsorbents to achieve low level As in drinking water for communities with high raw water arsenic concentration. The determination of arsenic species is also essential for a better understanding and prediction of the toxic and carcinogenic nature of the species present in natural water systems. It is generally known that As(III) is more toxic than As(V) and inorganic arsenicals are more toxic than organic derivatives. The objective of this study was to study the arsenic adsorption behaviour on iron oxide-coated sand (IOCS) and ferrihydrite (FH). Batch studies were conducted using these adsorbents with natural water containing 325 μg/L arsenic, and the removal of approximately 90% was obtained. The adsorption capacity of the IOCS and FH used in this study for arsenic was estimated as 18.3 and 285 μg/g, respectively. The experimental data fitted well with the well-known isotherms, namely, Freundlich, Langmuir and BET, indicating a favourable adsorption by these adsorbents. Speciation studies were also conducted with natural water containing arsenic. Particulate and soluble arsenic in water were determined, and As(III) in the sample was determined by passing the sample containing arsenic through anion exchange resin (Dowex 1X8-100; acetate form) packed in the column. Speciation studies with natural water showed that the particulate and soluble arsenic contributed 11.4 and 88.6% of the total arsenic present in the natural water, respectively. In the case of soluble arsenic, As(III) and As(V) were 47.3 and 52.7%, respectively.

scholarly journals Removal of iron and arsenic (III) from drinking water using iron oxide-coated sand and limestone

2013 ◽  
Vol 4 (2) ◽  
pp. 175-182 ◽  
Author(s):  
Rashmi R. Devi ◽  
Iohborlang M. Umlong ◽  
Bodhaditya Das ◽  
Kusum Borah ◽  
Ashim J. Thakur ◽  
...  
Keyword(s):  
Drinking Water ◽  
Iron Oxide ◽  
Coated Sand

scholarly journals Adsorption of arsenic and phosphate from groundwater onto a calcined laterite as fixed bed in column experiments

2020 ◽  
Vol 8 (2) ◽  
pp. 227-243
Author(s):  
Yacouba Sanou ◽  
Raymond Kabore ◽  
Samuel Pare
Keyword(s):  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Fixed Bed ◽  
Column Experiments ◽  
Arsenic Adsorption ◽  
Experimental Conditions ◽  
Ph Values ◽  
Naoh Solution ◽  
Removal Of Arsenic ◽  
Maximum Removal

This work was focused on laterite soil as adsorbent for the removal of arsenic and phosphate from groundwater using column experiments. Results revealed a decrease of arsenic removal efficiency from 100 to 79% with flow rate increasing. Maximum removal of 100% for arsenic and 85% for phosphates was obtained for pH values between 3.5 and 6. The increase of initial arsenic concentration and phosphate amount caused an increase of arsenic adsorption up to 24 µg/g while 58.5 µg/g for phosphate. NaOH solution could desorb 86.8% of arsenic and the reuse of regenerated laterite indicated its efficiency in same experimental conditions.

scholarly journals Extended performance analysis of polyurethane–iron oxide nanocomposite for efficient removal of arsenic species from water

2016 ◽  
Vol 17 (3) ◽  
pp. 889-896 ◽  
Author(s):  
Faten B. Hussein ◽  
Nidal H. Abu-Zahra
Keyword(s):  
Iron Oxide ◽  
Operation Mode ◽  
Absorption Spectrometry ◽  
Arsenic Species ◽  
Removal Capacity ◽  
Pu Foam ◽  
Cyclic Operation ◽  
Removal Of Arsenic ◽  
20 Nm

A polyurethane (PU) foam nanocomposite impregnated with iron oxide nanoparticles (IONPs) was developed to remove arsenic (As) from drinking water at ppb concentrations. The effect of synthesis and application parameters such as the size of IONPs, pH levels, weight of adsorbents, and arsenic concentrations on the performance of PU-IONP adsorbents in removing arsenic were studied. The prepared adsorbents were characterized by scanning electron microscopy and energy dispersive X-ray microscopy to evaluate the microstructure of PU-IONPs and the surface adsorption of arsenic species, respectively. Atomic absorption spectrometry was conducted to measure the concentration of arsenic in the treated solutions in order to calculate the removal capacity of PU-IONPs. The experimental results revealed that decreasing the size of IONPs from 50–100 nm to 15–20 nm yields a higher removal capacity. Increasing the weight of the used adsorbents and the contact time led to an increase in the removal capacity as well. As the arsenic species (III and V) concentration increased in the solution, the removal capacity of PU-IONPs decreased. In a column study, a long-term cyclic operation mode was found to be very effective in removing arsenic; 100% removal capacity was achieved when 500 ml of As solution (100 ppb) was treated.

Nano-iron oxide coated on sand as a new sorbent for removal of arsenic from drinking water

2015 ◽  
Vol 57 (28) ◽  
pp. 13030-13037 ◽  
Author(s):  
Daryoush Afzali ◽  
Mina Rouhani ◽  
Fariba Fathirad ◽  
Tayebeh Shamspur ◽  
Ali Mostafavi
Keyword(s):  
Drinking Water ◽  
Iron Oxide ◽  
Removal Of Arsenic

scholarly journals Adsorptive Removal of Arsenic by Mesoporous Iron Oxide in Aquatic Systems

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3147
Author(s):  
Jiyeol Bae ◽  
Suho Kim ◽  
Kwang Soo Kim ◽  
Hwan-Kook Hwang ◽  
Heechul Choi
Keyword(s):  
Iron Oxide ◽  
Removal Rate ◽  
Electrostatic Force ◽  
Average Pore Size ◽  
Equation Model ◽  
Sonochemical Method ◽  
Arsenic Adsorption ◽  
Average Pore ◽  
Bet Analysis ◽  
Removal Of Arsenic

In an effort to explore the potential for the removal of arsenic from water, mesoporous iron oxide (MI) was prepared using a sonochemical method. The surface area and average pore size of the MI sample were determined using a Brunauer Emmett Teller (BET) analysis to be 269 m2/g and 6.9 nm, respectively. Kinetic experiments revealed that more than 90% of the As(III) and As(V) were adsorbed onto the MI sample within 5 min at 0.1 g/L of MI dosage. The Langmuir equation model suited As(V), whereas As(III) related better to the Freundlich equation model due to different adsorption mechanisms. The predominant mechanism of As(V) adsorption onto MI is thought to be the electrostatic force between As(V) and MI, whereas As(III) in the solution bound to the adsorbed As(III) on the MI in a way consistent with van der Waals attraction. The removal rate of As(III) and As(V) has the highest adsorption efficiency in the pH 5–9 range. The adsorption of As(III) and As(V) was little affected by ionic strength, however the presence of H4SiO40 and PO43− significantly reduced the arsenic adsorption capacity. Furthermore, the adsorption and regeneration efficiency of MI was maintained at around 100% for given adsorption–regeneration cycles.

scholarly journals Facile Synthesis of Magnetic Activated Carbon Composite for Arsenic Adsorption

2019 ◽  
Vol 15 (2) ◽  
pp. 71-78
Author(s):  
Bivek Karki ◽  
Pragya Pandey ◽  
Rinita Rajbhandari ◽  
Sahira Joshi ◽  
Agni Raj Koirala ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Iron Oxide ◽  
Analytical Techniques ◽  
Carbon Composite ◽  
Commercial Application ◽  
Arsenic Content ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Arsenic Adsorption ◽  
X Ray ◽  
Removal Of Arsenic

Porous activated carbon (AC) and magnetic iron oxide nanoparticles (NPs) are widely used for the removal of arsenic from water body. Fabrication of composite material of iron oxide NPs on the surface of porous AC can further enhance this activity for commercial application. In this research, a magnetic AC composite for arsenic adsorption was prepared by facile hydrothermal treatment of aqueous solution containing activated carbon obtained from lapsi seed stone, iron(II) chloride, polyvinylpyrrolidone (PVP) and ethanol. Several analytical techniques such as scanning electron microscopy (SEM), energy dispersive x-ray (EDX), X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) confirmed the formation of magnetite (Fe3O4) nanoparticles on the surface of porous AC. The prepared materials were accessed for their arsenic adsorption capacity using arsenic (III) trioxide solution and found that composite Fe2O3/AC can remove the arsenic from water far more effectively than activated carbon alone. For 0.5 g/ltr loading of composite sample with contract time of 5 hours, the arsenic content was significantly reduced, which shows that as-fabricated composite can be used potentially for water treatment.

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