Arsenic removal from water using a new class of materials with adsorbent properties (original) (raw)
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A New Adsorbent for Arsenic Removal from Water
Water Pollution XIV, 2018
Water represents an essential resource for earth life and for all-natural processes. It is well known that in all developing countries the underground water resource represents the main source of drinking water and its contamination with arsenic presents a real problem. Thus, we have developed a new adsorbent based on cellulose doped with crown ethers (dibenzo-18-crown-6) functionalized with iron ions and used for the removal of arsenic from water. Usage of such extractants involves only a small amount of crown ether indicating higher efficiency of produced material, and, in order to improve the adsorbent properties and selectivity for arsenic removal, the modified cellulose was functionalized with iron ions. The new obtained adsorbent material was characterized by using energy dispersive X-ray analysis, scanning electron microscopy and Fourier Transform Infrared Spectroscopy. In order to investigate the adsorbent properties for arsenic removal equilibrium, kinetic and thermodynamic studies were performed. Arsenic adsorption from water onto a new adsorbent was studied under different experimental conditions such as reaction times, initial arsenic concentration and temperature. Obtained results show that the new produce adsorbent has a higher efficiency for arsenic removal, leading to lower residual concentration (under 10 µg As L-1-value accepted by WHO).
Review on application of low cost adsorbents for arsenic removal
Earth & Environmental Science Research & Reviews, 2022
Arsenic’s history in science, medicine and technology has been overshadowed by its notoriety as a poison in homicides. Arsenic is viewed as being synonymous with toxicity. Dangerous arsenic concentrations in natural waters, especially in ground water has become a worldwide problem and often referred to as a 20th–21st century calamity. The current regulation of drinking water standard has become more stringent and requires arsenic content to be reduced few parts per billion. There are numbers of arsenic removal methods, which include coagulation followed by view precipitation, membrane separation, anion exchange, adsorption etc. Some low-cost adsorbents are superior including Dry plants, red mud, fly ash, zeolites, blast furnace slag’s, hydrotalcites, hydroxides and various bio-adsorbents are include bio-char , methylated yeast biomass , fungal biomass , chicken feathers , alginate etc. The use of low-cost adsorbent obtained from an environmentally friendly materials, has been investigated as a replacement for the current expensive methods of removing arsenic from solution. Natural materials or waste products from certain industries with a high capacity for arsenic can be obtained, employed, and disposed of with little cost.
ISSN-2141-226X ©2012 Academic Journals Review Application of low-cost adsorbents for arsenic removal
2016
The presence of arsenic in waters, especially groundwater, has become a worldwide problem in the past decades. The current regulation of drinking water standard has become more stringent and requires arsenic content to be reduced to a few parts per billion. There are numbers of arsenic removal methods, which include coagulation followed by precipitation, membrane separation, anion exchange, etc. The use of low-cost adsorbent obtained from an environmentally friendly materials, has been investigated as a replacement for the current expensive methods of removing arsenic from solution. Natural materials or waste products from certain industries with a high capacity for arsenic can be obtained, employed, and disposed of with little cost. Modification of the adsorbents can also improve adsorption capacity. The aim of this article is to review briefly arsenic chemistry and previous and current available technologies that have been reported in arsenic removal. The technical feasibility of various low-cost adsorbents for arsenic removal from contaminated water has been reviewed.
Application of low-cost adsorbents for arsenic removal: A review
Journal of Environmental Chemistry and Ecotoxicology, 2012
The presence of arsenic in waters, especially groundwater, has become a worldwide problem in the past decades. The current regulation of drinking water standard has become more stringent and requires arsenic content to be reduced to a few parts per billion. There are numbers of arsenic removal methods, which include coagulation followed by precipitation, membrane separation, anion exchange, etc. The use of low-cost adsorbent obtained from an environmentally friendly materials, has been investigated as a replacement for the current expensive methods of removing arsenic from solution. Natural materials or waste products from certain industries with a high capacity for arsenic can be obtained, employed, and disposed of with little cost. Modification of the adsorbents can also improve adsorption capacity. The aim of this article is to review briefly arsenic chemistry and previous and current available technologies that have been reported in arsenic removal. The technical feasibility of various low-cost adsorbents for arsenic removal from contaminated water has been reviewed.
Desorption studies for low cost adsorbents
International Journal of Chemical Studies, 2015
Adsorption for wastewater treatment has been extensively studied and practiced method. It can selectively used for removal of certain pollutant by selection of suitable adsorbent. The used adsorption has to be discarded after it becomes exhausted. Commercial adsorbents can be regenerated and reused. The disposal of adsorbent is again solid treatment and disposal problem. The maximum regeneration and reuse is advised in order to make the operation environmental friendly. The current investigations aim at exploring the possibility and effectiveness of low cost adsorbent regeneration. The results indicate that the phenol desorption up to 40.7 and 30.9 for GNSA and RHA respectively and cadmium desorption up to 25.1 and 26.03 is possible for GNSA and RHA adsorbents respectively. The results indicates that there is need to study desorption of cadmium and phenol and explore more economical and effective option for adsorbent regeneration.
A new approach to modification of natural adsorbent for heavy metal adsorption
Bioresource technology, 2008
This paper describes modification of a natural adsorbent with Fenton reagent and determines the removal of Cd(II) ions from aqueous solution. Changes of the surface properties of adsorbent materials were determined by the FT-IR analysis after the modification of pine bark. The effect of Fe 2+ /H 2 O 2 ratio, ORP, pH, and contact time were determined. Different adsorption isotherms were also obtained using concentrations of Cd(II) ions ranging from 0.1 to 100 mg L À1 . The adsorption process follows pseudo-first-order reaction kinetics and follows the Langmuir adsorption isotherm. The paper discusses thermodynamic parameters, including changes in Gibbs free energy, entropy, and enthalpy, for the adsorption of Cd(II) on modified bark, and revealed that the adsorption process was spontaneous and exothermic under natural conditions. The maximum removal efficiency obtained was 97% at pH 7 and with a 90-min contact time (for 35 mg L À1 initial concentration and a 2.5 g L À1 solid-to-liquid ratio).
Ecology, Environment and Conservation, 2022
The review article provides an insight on various adsorbents and their efficiency in fluoride removal from drinking and waste water. The capacity of fluoride removal of adsorbent is dependent on pH, contact time, temperature, surface area of adsorbent and initial concentration of fluoride solution etc. In comparison to the traditional natural methods, the synthetic and nanostructure-based adsorbents, exhibited higher performance and efficiency of defluorination which provides a sustainable approach to safe drinking water quality. The present paper deals with some widely adopted natural adsorbent, synthetic and nanostructurebased adsorbents. The natural adsorbent includes, thermally treated lateritic soil, modified natural magnetite ore (Fe 3 O 4) with aluminum and lanthanum ions, lateritic soils, Titanium hydroxide, limestone (LS) and aluminium hydroxide, sedimentation with calcium and aluminium. The Synthetic adsorbent includes, Surface-functionalized polyurethane foam (SPUF); Schwertmannite; Carbonaceous material from pyrolysis of sewage sludge; Chitosan. And the effective adsorbent nano scale structure includes, nanoscale aluminium oxide hydroxide (AlOOH), Magnetic iron oxide/aluminium hydroxide composite, sulfatedoped Fe 3 O 4 / Al 2 O 3 nanoparticles, nano-scale aluminum oxide hydroxide (nano-AlOOH), Graphene Nanoparticles adsorbent, Al 2 O 3 /Bio-TiO 2 nano composite (ABN), Green synthesized Fe 3 O 4 /Al 2 O 3 nanoparticles with coated polyurethane foams etc. The activated alumina is most conventional fluoride adsorbing material. However, activated alumina performs well in acidic environment with complex regeneration issue. Although other traditional adsorbents remove fluoride from water but they have lower efficiency, which restrict their application. In case of synthetic and nano structured based adsorbents, due to increased surface area, nontoxic nature, limited solubility in water and high adsorption efficiency, these methods are widely accepted and proven environmentally suitable.
International Journal of Advanced Science and Engineering, 2020
Arsenic is one of the most toxic heavy metals to the environment which cause community health problem due to its high toxic nature. Several physiochemical techniques, such as adsorption, ion exchange, lime softening, reverse osmosis, coagulation and precipitation are used for arsenic removal but in this study, adsorption wasused because of its simplicity to use and availability of a wide range of adsorbents. Adsorption is the process which is used for the removal of heavy metals from wastewater. Although there are different adsorbents methods used to remove different type of heavy metal ions for study, iron impregnated activated carbon which was derived from sugarcane bagasse, was investigated as potential adsorbent for the removal of arsenic from aqueous solution. The synthetic wastewater was prepared in the laboratory to conduct the experiments. Batch experiments were conducted to obtain the optimum conditions for arsenic adsorption. Effect of experimental parameter such as pH, adsorbent dose, and initial arsenic ion concentration was determined at constant contact time of 30min and atmospheric temperature. The optimum conditions obtained were, pH 7, 1mg adsorbent dose and initial concentration of 20mg/L. Adsorption behavior could be described using the Langmuir and Freundlich isotherm models. Adsorption data was well fitted in Langmuir isotherm model. The maximum adsorption efficiency was found to be 96.5% a
Efficiency of Low Cost Adsorbents for the Removal of Arsenic from Water
Tribhuvan University Journal
Adsorption is one of the primary processes for removing arsenic from drinking water. This study focuses on developing inexpensive and effective adsorbents to remove arsenic from ground water. Eight different types of adsorbents were prepared. Some of these materials were chemically modified. The efficiency of percentage adsorption of arsenate, As (+III) on different materials were investigated at different pH, contact time and initial concentrations. Out of eight different types of adsorbents, the iron-loaded x ant hated orange waste (Fe-XOW) showed high efficiency for the removal of arsenic. It was found that approximately 83 % of arsenate, As (+III) and 87% of arsenate, As (+V) removal could be achieved at optimum pH of 10 and 4respectively. The significant effect of pH was in the range of 9 to12 for As (+III) and 3 to 5 for As (+V). Time dependency experiments for the arsenite uptake showed that the adsorption rate on Fe-XOW was fast initially for 1 hour, followed by slow attainm...
Arsenic removal from water/wastewater using adsorbents—A critical review
Journal of Hazardous Materials, 2007
Arsenic's history in science, medicine and technology has been overshadowed by its notoriety as a poison in homicides. Arsenic is viewed as being synonymous with toxicity. Dangerous arsenic concentrations in natural waters is now a worldwide problem and often referred to as a 20th–21st century calamity. High arsenic concentrations have been reported recently from the USA, China, Chile, Bangladesh, Taiwan, Mexico, Argentina, Poland, Canada, Hungary, Japan and India. Among 21 countries in different parts of the world affected by groundwater arsenic contamination, the largest population at risk is in Bangladesh followed by West Bengal in India. Existing overviews of arsenic removal include technologies that have traditionally been used (oxidation, precipitation/coagulation/membrane separation) with far less attention paid to adsorption. No previous review is available where readers can get an overview of the sorption capacities of both available and developed sorbents used for arsenic remediation together with the traditional remediation methods. We have incorporated most of the valuable available literature on arsenic remediation by adsorption (∼600 references). Existing purification methods for drinking water; wastewater; industrial effluents, and technological solutions for arsenic have been listed. Arsenic sorption by commercially available carbons and other low-cost adsorbents are surveyed and critically reviewed and their sorption efficiencies are compared. Arsenic adsorption behavior in presence of other impurities has been discussed. Some commercially available adsorbents are also surveyed. An extensive table summarizes the sorption capacities of various adsorbents. Some low-cost adsorbents are superior including treated slags, carbons developed from agricultural waste (char carbons and coconut husk carbons), biosorbents (immobilized biomass, orange juice residue), goethite and some commercial adsorbents, which include resins, gels, silica, treated silica tested for arsenic removal come out to be superior. Immobilized biomass adsorbents offered outstanding performances. Desorption of arsenic followed by regeneration of sorbents has been discussed. Strong acids and bases seem to be the best desorbing agents to produce arsenic concentrates. Arsenic concentrate treatment and disposal obtained is briefly addressed. This issue is very important but much less discussed.