Adsorbent For Arsenic Removal Research Articles

Vitamin Derived Nitrogen Doped Carbon Nanotubes for Efficient Oxygen Reduction Reaction and Arsenic Removal from Contaminated Water.

Nitrogen doped carbon nanotubes (NCNT) that were prepared by simple microwave pyrolysis of Niacin (Vitamin B3) as noble metal free electrocatalyst for oxygen reduction reaction (ORR) is reported. Our newly developed technique has the distinct features of sustainable and widely available niacin as a bi-functional source of both carbon and nitrogen, whereas the iron catalyst is cheap and the fourth most common element in the Earth’s crust. The results of the electrochemical tests show that our newly developed iron impregnated NCNT anchored on reduced graphene substrate (Fe@NCNT-rGO) catalyst exhibit: a positive half-wave potential (E1/2) of 0.75 V vs. RHE (reversible hydrogen electrode), four-electron pathway, and better methanol tolerance when compared to commercial 20% Pt/C. When applied as adsorbent for arsenic removal, our newly discovered NCNT-Fe illustrate the efficient and effective removal of arsenic across a wide range of pH values.

Molecularly imprinted nanoparticles (nanoMIPs): an efficient new adsorbent for removal of arsenic from water

Geogenic contamination of arsenic in the groundwater of the Indian subcontinent and other parts of the world has been reported. Many methods have been developed to remove arsenic species from water. The most promising technology is adsorption for its merits such as simple in operation, low cost, and considerably insignificant by-product formation. In this study, a new polymer-based nano-adsorbent for As(V) has been prepared using a synergistic approach of molecular imprinting and metal–organic ligand chemistry. The nano-adsorbent was formulated with cost-effective polymethacrylate imprinted with fluorescein and As(V) complex. After polymerization, As(V) in the polymer matrix was removed from the polymer to create cavities with a specific affinity for As(V). The imprinted polymer with nanopores (nanoMIP) has shown high adsorption capacity, i.e., 49 ± 7 mg L−1; and the adsorption phenomena were studied by using theoretical Langmuir and Freundlich isotherms. The adsorption kinetics data were well fitted with the pseudo-second-order rate equation. The analyte As(V) was effectively adsorbed onto nanoMIP from real environmental samples. Infrared spectra of nanoMIP have shown that electrostatic interaction between surface functionalities (such as, –COOH and –C=O) of nanoMIP with As(V) would be responsible for high adsorption capacity of As(V). The mode of binding of As(V) onto the nanoMIP was further justified by molecular modeling. About 98% of adsorbed As(V) was removed from nanoMIP by washing with 0.1 M HNO3 solution, and the regenerated nanoMIP showed re-adsorption for ten cycles. The leachate of spent nanoMIP contains as low as 0.9 µg L−1 of As(V), which is lower compared with commercially used iron and aluminum oxide-based adsorbents.

Efficient removal of arsenate from water by lanthanum immobilized electrospun chitosan nanofiber

A novel adsorbent CSN-La of lanthanum immobilized on electrospun chitosan nanofiber(CSN) was fabricated and used as adsorbent for arsenate removal. The effects of pH, contact time, arsenate concentration as well as column adsorption were investigated. The results indicated that the arsenate adsorption by CSN-La was pH dependent. The experimental data of arsenic adsorption by CSN-La well fitted pseudo-second-order kinetic model and Langmuir model. The saturated adsorption capacity of CSN-La reached up to 83.6 mg/g, which was significantly higher than that of CSN. CSN-La exhibited preferable arsenate removal in the presence of coexisting anions (chloride, sulfate, nitrate, bicarbonate) at much greater levels. The attractive performance of CSN-La rooted from its special structural characteristics, the host material CSN favored the preconcentration of arsenate through electrostatic attraction, and the immobilized lanthanum exhibited preferable arsenate removal through specific interaction. Column adsorption run by using CSN-La could effectively treat approximately 2650 bed volumes (BV) of feeding solution before breakthrough occurred (from 210 μg/L in influent to < 10 μg/L in effluent). The exhausted CSN-La could be repeatedly used after being eluted by sodium hydroxide solution. The obtained results indicated that CSN-La has a great potential in efficient removal of arsenate-containing water.

Characterization and Arsenic Adsorption Behaviors of Water Treatment Residuals from Waterworks for Iron and Manganese Removal.

Water treatment residuals (WTRs), obtained from a groundwater treatment plant for biological iron and manganese removal, were investigated and used as adsorbents for arsenic removal. The surface morphology and structural features of the WTRs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Brunauner–Emmett–Teller analysis (BET). Laboratory experiments were also carried out to test the adsorption capability and adaptability of WTRs on both As (III) and As (V) removal from the water. The results showed that the WTRs were mainly amorphous and had a large specific surface area of 253.152 m2/g. The maximum adsorption capacities, evaluated using the Langmuir isotherm equation, were 36.53 mg/g and 40.37 mg/g for As (III) and As (V), respectively. The pseudo-second-order model fitted the kinetic data better, with R2 more than 0.99 for both As (III) and As (V). The removal of As (V) decreased with the increase in pH, especially when the pH was above 9, whereas for As (III), the removal effectiveness almost remained constant at both acidic and neutral pHs. H2PO4− and SiO32− could strongly inhibit arsenic adsorption onto the WTRs, and the effect of other ions was little.

Enhanced adsorption removal of arsenic from mining wastewater using birnessite under electrochemical redox reactions

Manganese oxides have been extensively investigated for arsenic (As) adsorption from aqueous solution. However, the effect of electrochemical redox reactions on the adsorption performance and underlying mechanism remain elusive. Herein, birnessite was used for electrochemical adsorption of As from mining wastewater at a constant cell voltage, and the effect of cell voltage and the continuous use (without desorption) performance of birnessite electrode were also evaluated. At 1.2 V for 24 h, the concentrations of total As (As(T)) and As(III) in wastewater decreased from 3808.7 to 73.7 μg L−1 and 682.8 to 21.4 μg L−1, respectively. The As(T) removal ratio increased with increasing cell voltage and reached 98.1% at 1.2 V, which was higher than that at open circuit (84.1%). The Mn2+ concentration also significantly decreased in wastewater during As adsorption. The high potential of birnessite anode and the generation of H2O2 on cathode facilitated As(III) oxidation, and the electrochemical redox reactions of birnessite contributed to the enhancement of As(T) removal. The application of cell voltage reversal could improve the utilization rate of birnessite electrodes by dissolution-recrystallization during continuous use, and the As(T) removal ratio was increased from 73.5% to 85.1% after five cycles of voltage alteration. The present work indicates that birnessite is a promising absorbent for the electrochemical adsorption of As from real wastewaters.

Compared arsenic removal from aqueous solutions by synthetic mixed oxides and modified natural zeolites

Layered Double Hydroxides of Mg–Al–Fe and their mixed metallic oxides of high specific surface area were synthesized by the coprecipitation method. A natural zeolite from a regional quarry with high clinoptilolite content was conditioned and modified. Initially, an acid treatment was applied and subsequently Fe(III) was incorporated by the wet impregnation method. Then the prepared solid materials were characterized by XRD, N2 adsorption–desorption at 77 K, SEM, DRS UV–Vis, and MP-AES to determine their physicochemical properties. Finally, the solid materials were evaluated as adsorbents for arsenic removal in water. The tracking of As and its species concentration at trace levels was carried out by cathodic stripping Square-wave voltammetry, which has proved to be a highly selective and sensitive electrochemical method. High levels of effectiveness in terms of removal were achieved, particularly with the natural zeolites and mixed oxides of highest iron content.

Toward Realizing Multifunctionality: Photoactive and Selective Adsorbents for the Removal of Inorganics in Water Treatment.

Persistent and potentially toxic inorganic oxoanions (e.g., arsenic and selenium) are one class of contaminants of concern in drinking water for which treatment technologies must be improved. Effective removal of these oxoanions is made difficult by the varying adsorption affinity of the different oxidation states, as well as the presence of background ions with similar chemical structure and behavior that strongly compete for adsorption sites, greatly reducing removal efficiencies. Recent studies pointing to the negative health effects of inorganic oxoanion contaminants have resulted or are expected to result in new regulations lowering their allowable maximum concentration level (MCL) in drinking water. While these regulations are intended to protect human and environmental health, they must also allow for balanced economic costs. As such, the MCLs are often set at levels that are not as health protective due to high treatment costs that continue to present a significant challenge for small (500-3300 people) to very small (25-500 people) communities. In this Account, we focus on the development of novel cost-effective, sustainable, and efficient multifunctional and selective adsorbents that offer solutions to the above challenges through two platforms: nanoenabled and transition-metal cross-linked chitosan (TMCC) and crystal facet engineered nanometal oxides (NMO). These complementary platforms offer treatment solutions at different scales and flow rates (e.g., in a point-of-use device versus a small-scale community system). Multifunctional adsorbents combine processes that traditionally require multiple steps offering the potential for reducing treatment time and costs. Development of selective adsorbents can greatly increase removal efficiencies of target contaminants by either promoting their adsorption or hindering adsorption of competitive ions. The following sections describe (1) synthesis of novel nanoenabled waste sourced bioadsorbents; (2) development of multifunctional adsorbents to simultaneously photo-oxidize arsenite and adsorb arsenate; (3) development of a selective adsorbent for removal of arsenate and selenite over phosphate; (4) investigations of the conventional wisdom that increased surface area yields increased oxoanion removal using selenium sorption on nanohematite as a case study; and (5) crystal engineering of nanohematite to promote selenite adsorption. The novel technologies developed through these research efforts can serve as templates for the creation of future adsorbents tailored for use targeting other oxoanion contaminants of interest.

Low-cost fabrication of Fe2O3/rutile nanocomposite from Ilmenite ore: a highly effective adsorbent for removal of arsenic in aqueous media

Fe2O3/TiO2 composite has been extensively studied for heavy metals removal and photocatalysis. In photocatalysis, this composite was used for the degradation of organic dye pollutants. Herein, we reported a green approach to fabricate Fe2O3/TiO2 nanoparticles from ilmenite ore. The Fe2O3/rutile was synthesized by one-step reaction of ilmenite at 700 °C in 3 h, the raw Fe2O3/rutile composite was, then, grounded by a ball-milled process in 4 h to obtain nanostructured composite. The obtained Fe2O3/rutile nanoparticles have the diameter of 50–100 nm with the BET surface area of 7 m2 g−1. The adsorption behaviour of the nanostructured Fe2O3/TiO2 composite as adsorbent toward arsenic (particularly, oxidized form of arsenic [As(V)]) was investigated by carrying out batch adsorption. The adsorption isotherm was investigated by using both the Langmuir and Freundlich models. The sorption kinetics of adsorbent toward arsenic adsorption was found to be pseudo-second order. The Fe2O3/TiO2 composite exhibited fast and high adsorption capacity of 47.12 mg g−1 toward arsenic in various solution pHs. The composite was also found to be durable and recyclable for arsenic adsorption. Therefore, this as-prepared Fe2O3/TiO2 composite could be promising and cost-effective adsorbent for effective removal of arsenic contaminant from aqueous environment.

Polyvinyl alcohol-stabilized granular Fe–Mn binary oxide as an effective adsorbent for simultaneous removal of arsenate and arsenite

ABSTRACT A novel granular Fe–Mn (GFM) binary oxide sorbent, with a diameter of approximate 2.0 mm and a length of 2.0–3.0 mm, was successfully prepared using extrusion granulation method in this study. The GFM sorbent is highly porous with a BET-specific surface area of 210.3 m2/g. It shows high effectiveness in simultaneously adsorbing As(V) and As(III). The maximal sorption capacities for As(V) and As(III) are 33.2 and 50.7 mg/g at pH 7.0 ± 0.1, respectively, which are superior to most of granular sorbents reported in the literature. The present Ca2+, Mg2+, humic acids and fulvic acids do not have obvious influence on the arsenic sorption. But, coexisting anions affect negatively arsenic sorption in the following order: H2PO4 − > SiO3 2− > HCO3 − > SO4 2−. NaOH solution is an effective eluent for regeneration of the arsenic-loaded GFM. The GFM packed in the fixed-bed column can treat approximately 3400 and 6500 bed volumes of simulated groundwater containing 233 μg/L As(V) and As(III), respectively, before the arsenic concentration in the effluent reached a drinking water limit of 10 μg/L. The features of high effectiveness, selectivity and reusability make the GFM a potential alternative to remove simultaneously As(V) and As(III) from groundwater.

Fabrication of PVA/ZnO fibrous composite polymer as a novel sorbent for arsenic removal: design and a systematic study

PVA/ZnO nanofibrous composite polymer was synthesized as a novel sorbent via electrospinning method at ambient conditions. Physicochemical characteristics of the samples were analyzed using XRD, SEM, EDS, TGA/DSC, and BET techniques. Efficiency of the composite samples for arsenic removal [i.e., As (III) and As (V) anions] was studied under different conditions using RSM optimization approach. Experimental results of adsorption tests indicated that the synthesized PVA/ZnO polymer with the maximum removal of 97% is a highly efficient sorbent for arsenic comparable with other sorbents studied for arsenic removal. The effect of some cations on arsenic removal was also studied in this research. Results showed that the tested ions do not cause a significant reduction in the removal rate. PVA/ZnO composite polymer, which is highly biocompatible, can be considered as a new adsorbent for removal of arsenic from contaminated water.

Synthesis of fly ash based zeolite-reduced graphene oxide composite and its evaluation as an adsorbent for arsenic removal

A zeolite-reduced graphene oxide (ZrGO) based composite was synthesized to remove arsenic from water. To make a low-cost adsorbent, zeolite was synthesized using an inexpensive waste material; fly ash, which was further used to produce the ZrGO composite. Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), and Raman spectra were used to characterize the morphology and surface composition of the synthesized materials. Synthesized materials: zeolite, rGO and ZrGO were evaluated as an adsorbent to remove arsenic from water. The results indicated that all three were able to adsorb arsenic from water but the removal efficiency of ZrGO was the best as it was able to bring down the arsenic concentration within the WHO permissible limits. The maximum adsorption capacity for 100 μg/L of initial arsenic concentration was found to be 49.23 μg/g. Results indicate that pseudo second order kinetics describes the arsenic adsorption on ZrGO. Adsorption isotherm study for ZrGO shows best fit for Redlich-Peterson model of adsorption.

Adsorptive removal of arsenic from real sample of polluted water using magnetic GO/ZnFe2O4 nanocomposite and ZnFe2O4 nanospinel

Developing affordable and efficient materials for the removal of arsenic from drinking water is crucial for human and environmental safety. In the present study, the adsorptive performance of magnetic GO/ZnFe2O4 nanocomposite and ZnFe2O4 nanospinel for arsenic removal from aqueous water was analyzed. The adsorbents were characterized using Fourier-transform infrared spectroscopy, X-ray powder diffraction, transmission electron microscopy, selected area electron diffraction and vibrating sample magnetometer. The conditions were optimized by response surface methodology (RSM) by considering the main factors as adsorption time, arsenic concentration, dose of adsorbent and pH. The optimum condition for the removal of arsenic was observed at pH 9.76, 30 min of contact time, 13.4 mg L−1 of initial arsenic concentration and 0.048 g of adsorbent dosage. The predicted arsenic removal percent under optimized conditions was noted as 98%; on the other hand, the experimental values at optimized conditions were observed as 96%. The Pareto analysis predicted that pH of the polluted water is the major factor in adsorptive arsenic removal and the relative importance of the process factors was found in the following order: pH > arsenic concentration > contact time > adsorbent dosage. Thus, introduced compositions form a promising material for the decontamination of polluted water or using in environmental remediation programs.

Iron nanoparticle-modified water treatment residues for adsorption of As(III) and As(V) and their cement-based solidification/stabilization

Sludge of tap water production was modified by iron nanoparticles via borohydride reduction in ferric chloride as an adsorbent for arsenic removal from contaminated water. Factors affecting the adsorption of As(III) and As(V) were studied. The maximum adsorption capacity was 24.2 and 35.7 mg/g for As(III) and As(V), respectively. The modified sludge with 10% (w/w) iron was effective for As(III) and As(V) removal from wastewater, surface water, and groundwater. The arsenic-contaminated sludge was stabilized/solidified using cement. The leaching study of arsenic by the dynamic monolithic leaching test (DMLT) showed that arsenic was mildly leached from the solidified adsorbent.

Arsenic removal from aqueous solutions using Saccharomyces cerevisiae: Kinetic and equilibrium study

Saccharomyces cerevisiae is desired species of yeast for the biological removal of arsenic because of its high selectivity, performance, low‐cost, abundant availability, and the fact that it is environmentally friendly. Arsenic removal was experimentally conducted using S. cerevisiae, based on different parameters including pH (5–9), time (5–1440 min), the concentration of arsenic (0.1–1 mg/L) and adsorbent dose (0.5–5 g/L). The results indicated that the maximum removal efficiency of arsenic (81.45%) occurred under arsenic 0.1 mg/l, adsorbent 1 g/L, pH 5, and duration of 60 min. The adsorption process was well fitted with Langmuir model for the majority of samples tested. The experimental data were suitably fitted by the pseudo‐second order kinetic model, which was the best model to fit. The removal efficiency of arsenic had an increasing rate from 5 to 1440 min followed by equilibrium. Biosorption process is desired at low pH under acidic conditions. The results of this study confirmed that S. cerevisiae could be used as a low‐cost adsorbent for removal of arsenic from aqueous solutions. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S398–S402, 2019

Concrete/maghemite nanocomposites as novel adsorbents for arsenic removal

Concrete/maghemite nanocomposites were prepared by aging a mixture of magnetite nanoparticles (NPs), sand and Portland cement. Diverse spectroscopies and magnetometry revealed that the nanocomposites incorporate maghemite NPs in the concrete structure. Scanning electron microscopy also revealed the presence of maghemite NPs and variations on the surface morphology of concrete. Regarding the evaluation of the arsenic removal properties of concrete/maghemite nanocomposite, it was found that the addition of the NPs improved the arsenic removal capacity of concrete. Batch studies revealed that the adsorption isotherms fitted to the Gunary isotherm model. Furthermore, column studies demonstrated the application of the nanocomposites for arsenic removal from well water under dynamic conditions. Using the bed depth service time model for the evaluation of the column performance, it was shown that the columns of concrete/maghemite nanocomposites can diminish the arsenic concentration of water from 10 ppm to 10 ppb. By XPS, the adsorption of As(V) species on the nanocomposites was demonstrated. The use of magnetic NPs in concrete demonstrated that the magnetic properties of maghemite are conserved and the arsenic removal capacity of concrete is augmented. Moreover, the nanocomposites can be used in continuous flow systems for arsenic removal from hard water.

Adsorptive removal of arsenic by novel iron/olivine composite: Insights into preparation and adsorption process by response surface methodology and artificial neural network

Olivine, a low-cost natural material, impregnated with iron is introduced in the adsorptive removal of arsenic. A wet impregnation method and subsequent calcination were employed for the preparation of iron/olivine composite. The major preparation process parameter, viz., iron loading and calcination temperature were optimized through the response surface methodology coupled with a factorial design. A significant variation of adsorption capacity of arsenic (measured as total arsenic), i.e., 63.15 to 310.85 mg/kg for arsenite [As(III)T] and 76.46 to 329.72 mg/kg for arsenate [As(V)T] was observed, which exhibited the significant effect of the preparation process parameters on the adsorption potential. The iron loading delineated the optima at central points, whereas a monotonous decreasing trend of adsorption capacity for both the As(III)T and As(V)T was observed with the increasing calcination temperature. The variation of adsorption capacity with the increased iron loading is more at lower calcination temperature showing the interactive effect between the factors. The adsorbent prepared at the optimized condition of iron loading and calcination temperature, i.e., 10% and 200 °C, effectively removed the As(III)T and As(V)T by more than 96 and 99%, respectively. The material characterization of the adsorbent showed the formation of the iron compound in the olivine and increase in specific surface area to the tune of 10 multifold compared to the base material, which is conducive to the enhancement of the adsorption capacity. An artificial neural network was applied for the multivariate optimization of the adsorption process from the experimental data of the univariate optimization study and the optimized model showed low values of error functions and high R2 values of more than 0.99 for As(III)T and As(V)T. The adsorption isotherm and kinetics followed Langmuir model and pseudo second order model, respectively demonstrating the chemisorption in this study.

Environmentally Benign Adsorption Materials for Removing Arsenic from Aquatic Environment

Adsorptive removal of arsenic using adsorption gels prepared from orange and apple juice residues was reviewed by summarizing the authors’ previous papers. Orange and apple juice residues contain a large amount of pectin, partly methyl-esterified pectic acid, which exhibits high affinity for high-valent metal ions such as iron(III), rare earths(III) and zirconium(IV). Anionic species of arsenic(III, V) are effectively and selectively adsorbed on pectic acid gel via loading these high-valent metal ions. Raw orange juice residue was saponified using calcium hydroxide to improve the loading capacity for these metal ions. It was found that zirconium(IV) exhibits the most suitable adsorption behaviors for arsenic(III, V). Similar result was obtained also for apple juice residue. An actual sample of acid mine drainage from the Horobetsu mine which contained a high concentration of iron and low concentration of arsenic, was tested using the adsorption gel prepared from orange juice residue and the results were compared with those from the current treatment process based on coprecipitation with iron hydroxide. The new process using the above- mentioned adsorption gel was proposed for treatment of such acid mine drainage.

Stabilization of Fe/Cu nanoparticles by starch and efficiency of arsenic adsorption from aqueous solutions

Due to the severity of arsenic contamination of soil and water resources around the world, finding new adsorbents for arsenic removal from the water is of high importance. The present study investigates the possible use and effectiveness of starch-stabilized Fe/Cu nanoparticles for adsorption of arsenic from aqueous solutions. First, Fe/Cu nanoparticles at various starch concentrations of 0, 0.02, 0.04 and 0.06 wt% were synthesized and characterized by X-ray diffraction, transmission electron microscopy and zeta potential/particle size analyzer. Then 0.04 wt% stabilized Fe/Cu nanoparticles were tested for the sorption of As(III) and As(V) from synthetic arsenic-contaminated water. To have an understanding about the arsenic adsorption mechanism of nanoparticles, X-ray photoelectron spectroscopy (XPS) was performed before and after adsorption. The results showed that starch provides nanoparticles with a neutral surface and stabilization of nanoparticles is possible with 0.04 wt% or higher concentrations of starch. For 0.04 wt% starch-stabilized Fe/Cu nanoparticles, the adsorption isotherms fit well within the Langmuir equation, with maximum sorption capacities of 90.1 mg/g for As(III) and 126.58 mg/g for As(V) at a pH of 7.0 from the aqueous arsenic solutions. Examining the XPS spectra of nanoparticles before and after adsorption showed that arsenic adsorption by this nanoparticle can be due to the formation of inner-sphere arsenic complexes on the particle surface, and the surface oxygen-containing functional groups involved in adsorption. The high sorption capacity suggests the potential for applying starch-stabilized Fe/Cu nanoparticles to the contaminated waters for removal of arsenic.

Adsorptive removal of arsenic from aqueous solutions using magnetite nanoparticles and silica‐coated magnetite nanoparticles

Magnetite nanosorbents are known with high sorption capacity and ease of solid phase separation from surrounding liquid by the imposed external magnetic field. In this study, magnetite nanoparticles (MNPs) and silica‐coated magnetite nanoparticles (Si‐MNPs) were prepared and used for the removal of arsenic (III) from aqueous solutions. The nanosorbents were characterized by transmission electron microscope, X‐ray diffraction, Fourier transform infrared spectroscopy, and vibrating sample magnetometer. The spherical Fe3O4 nanoparticles in diameter of about 100 nm and SiO2 shells of 12 nm were formed. The saturation magnetization was found to be 78 and 58 e mug–1 for MNPs and Si‐MNPs, respectively. Under optimal conditions, both nanosorbents were very efficient for arsenite uptake (removal efficiency ≥99%). The highest removal percentage was obtained near PZC of nanosorbents where the net surface charge was zero. The MNPs exhibited higher sorption capacities in comparison with Si‐MNPs although they tended to be agglomerated in higher applied doses. The kinetic of experiments indicated the best fit to the pseudo‐second order model. Furthermore, the experimental data were best described by the Langmuir model. This study demonstrated the effectiveness of bare and silica coated magnetic nanoparticles to remove trace concentrations of arsenic (III) in water environment. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 951–960, 2018

Iron oxide and its modified forms as an adsorbent for arsenic removal: A comprehensive recent advancement

Abstract Arsenic, one of the elements having most terrible impact on the human being, is threatening the world continuously. It exists in the combined form in rocks under earth which on dissolution contaminates ground water. The contamination has led to a massive epidemic in East and South-East Asia, and the problem is more dangerous for Bangladesh and adjoining province, Bengal of India, where more than 100 million people are currently affected by arsenic contaminated ground water. Arsenic exists in water as oxyacids in two oxidation states, As(III) and As(V), the former is more toxic. Various techniques are under use for the removal of both forms of arsenic but most of these are not suitable for As(III) form. Adsorption has been proved most preferable technique for the removal of both forms of arsenic. Various types of solid materials had been used as adsorbent but nanomaterials have been reported more effective. However, some of these materials are toxic, difficult to separate after adsorption, and ineffective in the presence of water constraints. Iron oxides and its modified forms overcome all these shortcomings. Arsenic adsorption using various types of iron oxides has been surveyed and their sorption efficiencies have been compared herein. The effect of presence of other competitive ions in water has also been discussed. The valuable literature available on arsenic remediation, latest advancement, implementation of iron oxides in filters, and future perspective along with safe disposal of sludge produced have been incorporated.