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A novel material named Fe/Mn-C layered double hydroxide composite (Fe/Mn-C-LDH) was synthesized to remove arsenic from an aqueous solution. The removal performance of the composite toward arsenic ions was studied through the batch experiments. The experiment results showed that Fe/Mn-C-LDH exhibited a high adsorption capacity of …
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2.1 Application and Perspectives of Iron-Based Nanostructured Adsorbents for Arsenic Compounds' Removal. Iron-based adsorbents can be one-component and multicomponent, which contain metal nanoparticles, oxides, oxyhydroxides, ferrites, etc. Zero-valent iron nanoparticles (nZVIs) and their composites have extremely wide usage …
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A comprehensive review on removal of arsenic using activated carbon prepared from easily available waste materials. Review Article. Published: 11 April 2017. …
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EC is the most common method for removing arsenic; it has a maximal efficiency of 96% at doses up to one litre and different concentrations.
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2.2. Experimental procedure. Bath experiments explored the arsenic removal efficiency and stability of an As-bearing precipitate between wastewater and pyrite at various FeS 2 /As molar ratios, initial pH values, H 2 O 2 /As molar ratios, reaction temperatures, and reaction times. The pyrite was added to 200 mL of wastewater in a …
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1. Introduction. Arsenic is a kind of semi-metallic element [1], which is highly carcinogenic and toxic [2], [3].The most common arsenic species existing in natural water are arsenite (As(III)) and arsenate (As(V)) in inorganic forms [4], which are harmful to human health.The problem of arsenic contamination is more serious [5] due to the …
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As presents in water in different oxidation states, most commonly as arsenic As III (arsenite) and As V (arsenate) form. The predominant As III species are uncharged H 3 AsO 3, while the primary arsenate species are monovalent H 2 AsO 4 − and divalent HAsO 4 −2.The Eh–pH diagram, which illustrates the fields of stability of mineral or …
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Soil contamination by heavy metals can cause serious environmental risks, produce an adverse impact on the ecosystem, and lead to a serious threat to living organisms [8, 12, 19, 46].According to the data from the China Statistical Yearbook (2001–2017) [22, 23], the cultivation area contaminated by Pb, As, Cd, Hg, and Cu is 60.6 × 10 4 hm 2, occupying …
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1. Introduction. The problem of arsenic contamination of groundwater has spread around the world [1].Various countries and regions around the world are plagued by varying degrees of arsenic contamination, which endangers human health [2], [3].Long-term drinking arsenic-containing water will lead to diabetes, liver damage, cirrhosis and …
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For eliminating arsenic, we can choose coagulation – flocculation, adsorption, carbonate removal or iron removal.
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Subsequently, the removal efficiency of arsenic remains comparatively stable in the late period. According to the above results, sulfuric acid plays a crucial role in the removal of arsenic. As given in Fig. 7 (d), arsenic removal efficiency raises from 18.20% to 98.21% with increase H 2 SO 4 addition from 0 to 0.3 mL/g.
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Arsenic removal studies were carried out on different MOFs such as Fe-BTC MOF, MIL-53, and ZIF-8. However, no noteworthy results were found compared to other synthetic commercial and adsorbents.
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A concise review of arsenic removal technologies. • Arsenic toxicity, occurrence and health hazards. • Arsenic removal technology, its advantages and disadvantages. • Adsorption and use of functional materials hold better prospects for …
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From the perspective of pH, the change of pH is not sensitive to arsenic removal. In the study of He et al. (2020), the impact of pH affected the oxidation and removal of As 3+, which should be ...
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Arsenic (As) removal is of major significance because inorganic arsenic is highly toxic to all life forms, is a confirmed carcinogen, and is of significant environmental concern. As contamination in drinking …
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EPA's arsenic demonstration program's three rounds of projects funded 50 small, full-scale arsenic removal systems in 26 different states impacting over 60,000 …
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1. Introduction. Rice is consumed by nearly half of the global population, providing 30–70% of energy (Ranum et al., 2014) along with various micro and macronutrients.However, rice can be a significant source of inorganic arsenic (iAs, comprised of As III and As V), a poison and Group 1 carcinogen, according to the IARC …
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Nanoscale zero-valent iron (NZVI) was synthesized and tested for the removal of As(III), which is a highly toxic, mobile, and predominant arsenic species in anoxic groundwater. We used SEM-EDX, AFM, and XRD to characterize particle size, surface morphology, and corrosion layers formed on pristine NZVI and As(III)-treated …
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Arsenic Removal. Arsenic is a naturally occurring contaminant found in many groundwater sources. In 2001 the USEPA established a maximum contaminant level (MCL) of 0.010 mG/L (10 ppb). The common forms of arsenic are arsenite (As III) and arsenate (As V). Arsenite is more soluble in water and less available for precipitation or adsorption than ...
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This review is focused on the removal of arsenic from water using iron-based materials such as iron-based nanoparticles, iron-based layered double hydroxides …
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Figure 2.2 indicates that the arsenic removal efficiency in the absence of chlorine increases steeply from 15% to 80% as the pH changes from 9 to 11 when the arsenic concentration of the contaminated water is 400 μg/L. Arsenic removal efficiency for the same feed varies almost linearly (from 30% to 95%) with pH in the range of 8–11 in the …
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Effects of sulfate, phosphate, silicate and humic acid (HA) on the removal of As(III) in the KMnO 4 –Fe(II) process were investigated in the pH range of 4–9 with permanganate and ferrous sulfate applied at selected dosage. Sulfate decreased the removal of arsenic by 6.5–36.0% at pH 6–9 and the decrease in adsorption did not …
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This study was aimed to investigate the effectiveness of compounds containing iron and manganese to reduce the mobility of arsenic and its effective adsorption and optimize the arsenic adsorption process by CCD. In this study, MnFe2O4 nanoparticles (MFO-n) were synthesized using the co-precipitation method to remove arsenic and reduce its toxicity …
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EPA's arsenic demonstration program's three rounds of projects funded 50 small, full-scale arsenic removal systems in 26 different states impacting over 60,000 consumers. In all cases, the states' drinking water agencies provided support in the selection and permitting of the technology being demonstrated.
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Arsenic is extremely toxic and its release has caused great environmental concerns. Coal combustion is considered to be one of the major anthropogenic emission sources. Arsenic removal technology from coal combustion can be divided into three categories: pre-combustion removal, removal during combustion and post-combustion …
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comparison is made among different roasting options ( kilns, multi-hearths and fluid beds) to qualify their. potential application to arsenic roasting of copper concentrates. Both direct and ...
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Arsenic can be removed most commonly by precipitation as ferric arsenate, calcium arsenate, or arsenic sulfide (Jadhav et al., 2015). Even though there is a high removal …
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RO filters can remove up to 75% of Arsenic (III), but you may need to oxidize it to Arsenic (V) using chlorine, ozone, or potassium permanganate to ensure better removal efficiency. Ion Exchange. The ion exchange process is another useful technology for arsenic removal. Water softeners use this principle to remove minerals that cause …
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2.4. Scientometric analysis. The scientometric analysis, a method applied to identify the research priority in any field of science, was applied to identify the research needs in As removal from aqueous solution ( Wu et al., 2020 ). Literature was searched using the keywords "Arsenic", "removal" and "water" in the Scopus.
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Abstract. This study tested the technical feasibility of pyrite and/or persulfate oxidation system for arsenic (As) removal from aqueous solutions. The effects of persulfate on As removal by the pyrite in the integrated treatment were also investigated. Prior to the persulfate addition into the reaction system, the physico-chemical interactions ...
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