Effects of hardness and alkalinity on the removal of arsenic(V) from humic acid-deficient and humic acid-rich groundwater by zero-valent iron

Mak, Mark S.H.; Rao, Pinhua; Lo, Irene M.C.

doi:10.1016/j.watres.2009.06.022

Cited by 97 publications

(27 citation statements)

References 36 publications

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“…It is generally accepted that the main mechanism of arsenic removal by ZVI involves adsorption, reduction, surface precipitation, and coprecipitation with various iron corrosion products such as ferrous/ferric (hydr)oxides (Mak et al 2009). However, the operating conditions may have an important role in controlling the overall effectiveness of arsenic removal.…”

Section: Zerovalent Iron Nanoparticlesmentioning

confidence: 99%

“…However, Litter et al (2010) reported that the mayor disadvantage of nZVI is its complicated synthesis. Mak et al (2009) investigated the arsenic(V) removal using zerovalent iron from humic acid (HA)-deficient and HA-rich groundwater. The authors reported that arsenic was removed from groundwater by adsorption and coprecipitation on iron corrosion products.…”

Section: Zerovalent Iron Nanoparticlesmentioning

confidence: 99%

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Arsenic removal by nanoparticles: a review

Habuda-Stanić

Nujić

2015

Environ Sci Pollut Res

158

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Contamination of natural waters with arsenic, which is both toxic and carcinogenic, is widespread. Among various technologies that have been employed for arsenic removal from water, such as coagulation, filtration, membrane separation, ion exchange, etc., adsorption offers many advantages including simple and stable operation, easy handling of waste, absence of added reagents, compact facilities, and generally lower operation cost, but the need for technological innovation for water purification is gaining attention worldwide. Nanotechnology is considered to play a crucial role in providing clean and affordable water to meet human demands. This review presents an overview of nanoparticles and nanobased adsorbents and its efficiencies in arsenic removal from water. The paper highlights the application of nanomaterials and their properties, mechanisms, and advantages over conventional adsorbents for arsenic removal from contaminated water.

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Section: Zerovalent Iron Nanoparticlesmentioning

confidence: 99%

Section: Zerovalent Iron Nanoparticlesmentioning

confidence: 99%

Arsenic removal by nanoparticles: a review

Habuda-Stanić

Nujić

2015

Environ Sci Pollut Res

158

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“…A 10 µg/L limit for arsenic was considered as drinking water guideline by the world health organization (WHO), whereas the standard in Iran is 50 µg/L (7,8,10). The inorganic compounds of arsenic have been classified as Category 1A by the international agency for research on cancer (IARC) (11)(12)(13).…”

Section: Introductionmentioning

confidence: 99%

“…The inorganic compounds of arsenic have been classified as Category 1A by the international agency for research on cancer (IARC) (11)(12)(13). Different studies have proven an association between the arsenic content of water and diabetes and liver cancer as well as with bladder, intestine, skin, and kidney diseases (6,(9)(10)(11)(14)(15)(16).…”

Section: Introductionmentioning

confidence: 99%

Determination of Total Arsenic in Water Resources: A Case Study of Rivash in Kashmar City

et al. 2015

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Background: Arsenic is one of the hazardous elements, and drinking arsenic-rich water could cause various diseases such as cancer. The standard by the world health organization (WHO) and Iran for arsenic in drinking water is 10 µg L -1 and 50 µg L -1 , respectively. Objectives: This study was conducted to survey the arsenic concentration in the rural water resources of Rivash, Kashmar. Materials and Methods:In this cross-sectional study, 60 samples were gathered from 10 sampling stations (all water supplies in Rivash, Kashmar) from April to June 2013. All the water supplies were groundwater (i.e. wells and springs). The sampling and preservation of the samples were performed according to the standard methods, and assessment was conducted using the Vapor Generation Accessory (VGA) method. Some factors such as pH, total dissolved solids (TDS), and electrical conductivity (EC) were tested to survey their relationship with the arsenic concentration. The data were analyzed using SPSS and the statistical tests of one-sample t-test and Mann-Whitney at a significance level of 0.05. The arsenic level was thereafter compared with the national and international standards. Results: The average arsenic levels in stations A, B, C, D, E, F, G, H, I, and J were 1.53 ± 1.03, 1.30 ± 1.07, 10.55 ± 3.83, 11.21 ± 5.01, 10.57 ± 3.68, 2.34 ± 0.73, 3.22 ± 0.58, 9.89 ± 3.57, 10.48 ± 5.07, and 2.23 ± 0.53µg L -1 , respectively. The arsenic concentration levels were higher than the WHO guideline in 5 stations and lower in the others, but in none of the stations did the levels exceed the national standard. The difference between the arsenic levels and the national standard was statistically significant (P < 0.001). The difference between the arsenic levels in 50% of the stations and the WHO standard was significant (P < 0.001). There were no significant relationships between the arsenic level and TDS, EC, temperature, salinity, and residual chlorine, with the exception of pH. Conclusions: Given the high levels of arsenic in the Rivash water sources, it is essential that a plan be devised to replace the current supply with safe drinking water. Moreover, these water resources should be monitored regularly regarding the risk of contamination with arsenic.

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“…Zero-valent iron nanoparticles (ZVINPs) are widely used to inactivate microbes (4,5), eliminate dyes (6)(7)(8)(9)(10)(11)(12), and toxins such as heavy metals (13)(14)(15)(16)(17) and pesticides (18,19). According to the authors best knowledge, no report is found on the removal of organophosphate pesticides using ZVINPs, exclusively.…”

Section: Introductionmentioning

confidence: 99%

Temephos Removal From Water Samples by Silver Modified Zero-Valent Iron Nanoparticles

Shiralipour

Zargar

Parham

2015

Jundishapur J Health Sci

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Background:Temephos is an organophosphate pesticide used as larvicide in the environment. Although not extremely hazardous, it can be risky for human health in the moderate concentrations. Objectives: This study investigated the quantitative removal efficiency of temephos, an organophosphate pesticide, from contaminated water by silver-modified ZVINPs. In addition, the operational parameters affected on removal process were optimized. Materials and Methods: In the current study, three water samples from different parts of Iran such as Ahvaz tap water, the Karoon River passing through Khoramshahr city, and the Caspian Sea were collected. A new method for effective removal of temephos from the sample solutions by silver modified zero-valent iron nanoparticles as an efficient adsorbent was introduced. Results: For a typical solution in which temephos was removed about 21% by iron zero-valent nanoparticles, modification by silver improved removal method was up to about 99%. The required time for the complete removal of temephos was about eight minutes. Variation of pH and concentration of KNO 3 as an electrolyte was considerably ineffective on the efficient temephos removal. Adsorption studies of the method were followed by Langmuir isotherm. Maximum temephos adsorption amount was 12.65 mg/g under optimal conditions. The proposed method was simple, fast and safe to treat temephos polluted waters. Preparation of the adsorbent was easy and removal time was short. Conclusions: Briefly, the current study represents a novel method to eliminate temephos as an organophosphate compound from water samples with modified zero-valent iron nanoparticles.

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Effects of hardness and alkalinity on the removal of arsenic(V) from humic acid-deficient and humic acid-rich groundwater by zero-valent iron

Cited by 97 publications

References 36 publications

Arsenic removal by nanoparticles: a review

Arsenic removal by nanoparticles: a review

Determination of Total Arsenic in Water Resources: A Case Study of Rivash in Kashmar City

Temephos Removal From Water Samples by Silver Modified Zero-Valent Iron Nanoparticles

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