Arsenic (V) removal with nanoparticulate zerovalent iron: Effect of UV light and humic acids

Heavy metal removal from water required reliable and cost-effective considerations, fast separation as well as easy methodology. In this piece of research, nanozerovalent iron (NZVI) was prepared as ideal sorbent for Pb 2? removal. The sample was characterized using X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), and atomic force microscope (AFM-SPM). Batch experiments comprised the effect of pH value and contact time on the adsorption process. The same NZVI was stored for a shelf time (10 months) and the batch experiment was repeated. The outcomes of the investigation assured that NZVI publicized an extraordinary large metal uptake (98%) after a short contact time (10 h). The stored sample revealed the same effectiveness on Pb 2? removal under the same conditions. The results of the physical properties, magnetic susceptibility, and conductance were correlated with the adsorption efficiency. This work offers evidence that these NZVI particles could be potential candidate for Pb 2? removal in large scale, stored for a long time using a simple, green, and cost-effective methodology, and represent an actual feedback in waste water treatment.

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“…or mainly Fe 3? species, which can be described as follows (Geng et al 2009;Uzum et al 2009;Morgada et al 2009;Rao et al 2009):…”

Section: Introductionmentioning

confidence: 99%

Effective Pb2+ removal from water using nanozerovalent iron stored 10 months

et al. 2017

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“…All processes are limited with lower efficiency for arsenite removal because of the uncharged state of the species under pH 8 which necessitates the oxidation of As(III) before the removal step. In last years, nanozero valent iron has become one of the most attractive materials for arsenic removal which effectively removes both inorganic forms [8,9]. Application of various biomasses in arsenic removal has been reviewed by Mohan and Pittman [2].…”

Section: Introductionmentioning

confidence: 99%

Sorption of As(V) from waters using chitosan and chitosan-immobilized sodium silicate prior to atomic spectrometric determination

Boyacı

Eroğlu

Shahwan

2010

Talanta

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Keywords:As(V) As(III) Sorption Chitosan Chitosan-immobilized sodium silicate a b s t r a c t A natural biosorbent containing amine functional groups, chitosan, and a novel sorbent, chitosanimmobilized sodium silicate, were prepared and utilized for the selective sorption of As(V) from waters prior to its determination by atomic spectrometric techniques, namely, hydride generation atomic absorption spectrometry (HGAAS) and inductively coupled plasma mass spectrometry (ICP-MS). Chitosan was synthesized from chitin and sodium silicate was used as the immobilization matrix due to its straightforward synthesis. Through sequential sorption studies, it was shown that chitosan-immobilized sodium silicate has exhibited a better chemical stability than the chitosan itself which demonstrates the advantage of immobilization method. Both chitosan and chitosan-immobilized sodium silicate were shown to selectively adsorb As(V), arsenate, from waters at pH 3.0 at which neither chitin nor sodium silicate displayed any sorption towards As(V). The sorption of arsenate by chitosan is supposed to have electrostatic nature since pH of 3.0 is both the point at which the amino groups in chitosan are protonated and also the predominant form of As(V) is H 2 AsO 4 − . A pre-oxidation step is required if both As(III) and As(V) are to be determined. Desorption from the sorbents was realized with 1.0% (w/v) l-cysteine prepared in a pH 3.0 solution adjusted with HCl. Among the possible interfering species tested, only Te(IV) and Sb(III) were shown to cause a decrease in the sorption capacity especially at high interferant concentrations. High concentrations of Sb(III) also resulted in gas phase interference during hydride generation.The validity of the method was checked both via spike recovery experiments and also through the analysis of a standard reference material. Spike recovery tests were carried out with four different types of water; namely, ultra-pure, bottled drinking, tap, and sea water; and percent recovery values were found to be 114 (±4), 112 (±2), 43 (±4), and 0 (±1), respectively. It was concluded that the proposed methodology can be applied efficiently to low-to-medium ionic strength solutions, such as most drinking waters. The accuracy of the method was additionally investigated through the analysis of a standard reference material and a good correlation was found between the determined (26.6 ± 2.4 g L −1 ) and the certified (26.67 g L −1 ) value.

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“…Adsorption, chemical coagulation-precipitation and membrane separation have been established as the broad technology options in the purification of arsenic contaminated drinking water. In adsorption-based studies (Kazuo and Toshio 1998;Balaji et al 2000;Elizalde-Gonzalez et al 2001;Grafe et al 2001;Xu et al 2002;Morgada et al 2009) several adsorbents have been examined for assessing the effectiveness of arsenic separation from water in small scale. Physico-chemical separation through chemical coagulation and precipitation has been demonstrated by several researchers (Edwards and Benjamin 1989;Brewster 1992;Cheng et al 1994;Edwards 1994;Hering et al 1996;Hering 1997;Hatice et al 2004;Wickramasinghe et al 2004).…”

Section: Available Purification Optionsmentioning

confidence: 99%

“…However, activated carbon still remains an expensive material. Morgada et al (2009) studied the removal of arsenic from drinking water by commercial iron nanoparticles and observed that the main mechanism of arsenic removal was adsorption on iron corrosion phases promoted by reactive oxygen species and the same could be enhanced by UV-irradiation. They were successful in removing arsenic well up to 10 mg/l from arsenic-contaminated groundwater of the Chacopampean Plain of Argentina (Tucuman province).…”

Section: Adsorptionmentioning

confidence: 99%

“…Arsenic contamination of groundwater has now resulted in world-wide human health problems affecting millions of people across a large number of countries like Argentina (Smedley and Edmund 2002;Heredia and Cirelli 2009;Morgada et al 2009), Bangladesh (Islam et al 2004;Zhenga et al 2004;Hafeman et al 2005;Harvey et al 2006; Klump et al 2006;Sengupta et al 2008;Chen et al 2009), India (Pal et al 2007b;Sengupta et al 2008;Bhattacharjee et al 2005;Smith et al 2000;Chakraborti et al 2003), Nepal (Panthi et al 2006;Pokhrel et al 2009), Pakistan (Nickson et al 2005), Thailand (World Bank Technical Report 2004), China (Ding et al 2001;Xia et al 2007), USA (Schreiber et al 2000;Wickramasinghe et al 2004), Vietnam (Berg et al 2001;Tong 2002), Mexico (Romero-Schmidt et al 2001), Mongolia (Smedley et al 2003), and Taiwan (Tseng 2003;Hsieh et al 2008). In some places in Bangladesh, the concentration of arsenic in groundwater is as high as 1000 mg/l (Harvey et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Contamination of groundwater by arsenic: a review of occurrence, causes, impacts, remedies and membrane-based purification

Pal¹,

Sen²,

Manna³

et al. 2009

Journal of Integrative Environmental Sciences

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The contamination of groundwater by leached out arsenic has assumed an alarming proportion in several countries. Continued and prolonged ingestion even at a very low level can lead to serious arsenic-related diseases. Strong epidemiological evidence of arsenic carcinogenicity has forced the World Health Organization (WHO) to lower the maximum permissible contaminant limit (MCL) in drinking water to 10 ppb from earlier limit of 50 ppb. This has thrown a big challenge to the scientific community to devise efficient methods to purify contaminated water to such a high level. Though literature abounds in occurrence of groundwater contamination by arsenic and its removal from drinking water by laboratory techniques, millions of people continue to suffer, particularly in the developing countries like India (Bangladesh, West Bengal). Through a comprehensive review of the existing literature on the occurrence, causes, impacts and remedial measures, this article finds out what has gone wrong and what is to be done with special emphasis on membrane-based separation that seems to be highly promising in purifying arsenic-contaminated groundwater to a WHOprescribed level.

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Arsenic (V) removal with nanoparticulate zerovalent iron: Effect of UV light and humic acids

Cited by 103 publications

References 57 publications

Effective Pb2+ removal from water using nanozerovalent iron stored 10 months

Effective Pb2+ removal from water using nanozerovalent iron stored 10 months

Sorption of As(V) from waters using chitosan and chitosan-immobilized sodium silicate prior to atomic spectrometric determination

Contamination of groundwater by arsenic: a review of occurrence, causes, impacts, remedies and membrane-based purification

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