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Journal ArticleDOI: 10.1080/00986445.2020.1715956

A review on electrochemical treatment of arsenic from aqueous medium

04 Mar 2021-Chemical Engineering Communications (Taylor & Francis)-Vol. 208, Iss: 3, pp 389-410
Abstract: The existence of arsenic in nature and its toxicity has gained huge consideration in recent years. The electrochemical methods are getting more attention in the removal of arsenic in over the last ...

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Topics: Arsenic (58%), Capacitive deionization (52%)

14 results found

Open access
01 Oct 2009-
Abstract: The adsorption, electrosorption, and electrodesorption of aqueous, inorganic arsenic on the granular activated carbon (GAC), DARCO 12 × 20 (Darco 1220) GAC, were investigated in solutions containing arsenic as the only contaminant, as well as with chromium, nickel, and iron. Darco 1220 was selected for these investigations primarily because it is relatively ineffective as a normal (unassisted) arsenic adsorbent in the chosen electrolytes at the low loadings used. It is shown that the application of anodic potentials in the 1.0−1.5 V range, however, result in enhanced uptake, most likely because of charging of the electrochemical double layer at the electrode surface. Regeneration (100%) of electrosorbed arsenic was achieved via electrodesorption at a cathodic potential of 1.50 V. The presence of metal ad ions was observed to have a significant and complex effect on arsenic adsorption, electrosorption, and electrodesorption. In particular, the Cr/As ratio was shown to have complex effects, decreasing adsor...

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Topics: Arsenic (56%), Adsorption (51%)

48 Citations

Journal ArticleDOI: 10.1016/J.CHEMOSPHERE.2020.126652
01 Aug 2020-Chemosphere
Abstract: As dairy industries has been emerged as one of the most rapidly developing industry in both small as well as large scale, the volume of effluent generated is also very high. In the present study, aerated electrocoagulation combined with phytoremediation treatment was conducted in dairy industry wastewater. Electrocoagulation was performed with aluminium and iron electrodes and effect of various operating parameters such as electrode combination, pH, and voltage were tested. Electrocoagulation was found effective at neutral pH and its efficiency increased with increase in applied voltage. The maximum COD removal efficiency of 86.4% was obtained in case of Al–Fe electrode combination with aeration at 120 min reaction time, initial pH 7, voltage 5 V. Significant growth of Canna indica was observed in electrocoagulation treated wastewater compared to raw dairy wastewater. COD removal of 97% was achieved when combined electrocoagulation and phytoremediation process was used. Thus, it proves to be a proficient method for the treatment of dairy industry wastewater. In addition to the above, bacterial toxicity tests were performed to investigate the toxic nature of wastewater and the results showed that both treated and untreated wastewater favoured bacterial growth.

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Topics: Electrocoagulation (60%), Wastewater (58%), Sewage treatment (51%) ... show more

44 Citations

Journal ArticleDOI: 10.1016/J.CHEMOSPHERE.2020.128253
01 Jan 2021-Chemosphere
Abstract: Co-occurrence of arsenic and anions in groundwater causes a severe health problems and combine effects of these pollutants significantly affect performance of treatment process. Thus, this study has been conducted to examine the combine effects of anions on arsenic removal using aerated electrocoagulation (EC) reactor with 3D Al electrodes in groundwater. A 3-level, six factors Box-Behnken experimental design (BBD) was applied to investigate the individual and combine effect of anions and operating time: phosphate ( x 1 : 1–10 mg L−1), silica ( x 2 : 20–80 mg L−1), bicarbonate ( x 3 : 130–670 mg L−1), fluoride ( x 4 : 2–10 mg L−1), boron ( x 5 : 5–10 mg L−1), and operating time ( x 6 : 8–22 min) on desired responses. The specified responses were effluent arsenic concentration (Cf,As), removal efficiency of arsenic (Re), consumptions of energy and electrode (ENC and ELC), operational cost (OC), and adsorption capacity (qe). The optimum operating parameters predicted using BBD were found to be x 1 : 1.0 mg L−1, x 2 : 26.0 mg L−1, x 3 : 651.5 mg L−1, x 4 : 2.0 mg L−1, x 5 : 9.9 mg L−1, and x 6 : 10.5 min considering highest removal efficiency of arsenic and lowest operational cost. Under these operating conditions, the experimental values of Cf,As, Re, ENC, ELC, OC, and qe were found to be 2.82 μg L−1, 98.6%, 0.411 kWh m−3, 0.0124 kg m−3, 0.098 $ m−3, and 17.65 μg As (mg Al)−1, respectively. Furthermore, mathematical modelling was conducted using quadratic regression model and response surface analysis was performed to understand the relationship between independent parameters and responses.

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Topics: Arsenic (54%)

10 Citations

Journal ArticleDOI: 10.1016/J.SETA.2021.101476
Abstract: Removal of arsenite from the simulated arsenite contaminated groundwater by using continuous aerated iron electrocoagulation process (CAIEC) (iron electrodes as both anode and cathode) was examined in the present study. The experiments to treat 1 mg L−1 arsenite concentration at two distinctive flow rates i.e. 5 L h−1 and 10 L h−1 were performed. During the process, it was observed that electrode passivation can lead to a reduction in arsenic removal efficiency. The layer formation/passivation of the electrode during the process cannot be controlled but it can be lowered up to some extent by changing the polarity after each run. The average arsenic-iron sludge generated from the process was 35.8 to 70.64 mL L−1 per cycle. Highlighting the proper arsenic-iron sludge management, reusability of this sludge as a binding material in concrete was investigated through solidification and stabilization techniques. A slight variation in the compressive strength of concrete was observed with the addition of arsenic-iron sludge. The presence of arsenic in the concrete mix was confirmed by XRD analysis. The arsenic leachability from the sludge samples as well as stabilized concrete cubes was analyzed with toxicity characteristic leaching procedure (TCLP) (both static and dynamic) and observed insignificant arsenic leaching.

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Topics: Arsenite (59%), Arsenic (55%), Toxicity characteristic leaching procedure (52%) ... show more

4 Citations

Journal ArticleDOI: 10.1016/J.JTICE.2021.02.010
Abstract: In this work, the performance of photocatalytic Cr(VI) reduction and As(III) oxidation in single and co-existing systems was systematically evaluated. The results exhibited that by employing Ni/N-codoped SnO2/Fe2O3 nanocomposites, the simultaneous photocatalytic redox conversion of Cr(VI) and As(III) were remarkably accelerated under visible light irradiation. The highest efficiency of Cr(VI) reduction and As(III) oxidation was found to be 99 and 96% with recyclability of 96.1 and 93.7% after five cycles over 8Ni/N-codoped SnO2/Fe2O3 nanocomposite under 90 min irradiation in the co-existing system, respectively. These findings open a new path to design high-performance photocatalysts for the synergetic photocatalytic redox conversation and removal of Cr(VI) and As(III) under visible light irradiation.

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Topics: Photocatalysis (51%)

3 Citations


170 results found

Journal ArticleDOI: 10.1016/S0039-9140(02)00268-0
Badal Kumar Mandal1, Kazuo T. Suzuki1Institutions (1)
16 Aug 2002-Talanta
Abstract: This review deals with environmental origin, occurrence, episodes, and impact on human health of arsenic. Arsenic, a metalloid occurs naturally, being the 20th most abundant element in the earth's crust, and is a component of more than 245 minerals. These are mostly ores containing sulfide, along with copper, nickel, lead, cobalt, or other metals. Arsenic and its compounds are mobile in the environment. Weathering of rocks converts arsenic sulfides to arsenic trioxide, which enters the arsenic cycle as dust or by dissolution in rain, rivers, or groundwater. So, groundwater contamination by arsenic is a serious threat to mankind all over the world. It can also enter food chain causing wide spread distribution throughout the plant and animal kingdoms. However, fish, fruits, and vegetables primarily contain organic arsenic, less than 10% of the arsenic in these foods exists in the inorganic form, although the arsenic content of many foods (i.e. milk and dairy products, beef and pork, poultry, and cereals) is mainly inorganic, typically 65-75%. A few recent studies report 85-95% inorganic arsenic in rice and vegetables, which suggest more studies for standardisation. Humans are exposed to this toxic arsenic primarily from air, food, and water. Thousands and thousands of people are suffering from the toxic effects of arsenicals in many countries all over the world due to natural groundwater contamination as well as industrial effluent and drainage problems. Arsenic, being a normal component of human body is transported by the blood to different organs in the body, mainly in the form of MMA after ingestion. It causes a variety of adverse health effects to humans after acute and chronic exposures such as dermal changes (pigmentation, hyperkeratoses, and ulceration), respiratory, pulmonary, cardiovascular, gastrointestinal, hematological, hepatic, renal, neurological, developmental, reproductive, immunologic, genotoxic, mutagenetic, and carcinogenic effects. Key research studies are needed for improving arsenic risk assessment at low exposure levels urgently among all the arsenic research groups.

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Topics: Arsenic (62%), Arsenic trioxide (59%), Hyperkeratoses (53%)

2,836 Citations

Journal ArticleDOI: 10.1021/CR900136G
19 Oct 2009-Chemical Reviews
Abstract: 2.2. Fenton’s Chemistry 6575 2.2.1. Origins 6575 2.2.2. Fenton Process 6575 2.3. Photo-Fenton Process 6577 3. H2O2 Electrogeneration for Water Treatment 6577 3.1. Fundamentals 6578 3.2. Cathode Materials 6579 3.3. Divided Cells 6580 3.4. Undivided Cells 6583 4. Electro-Fenton (EF) Process 6585 4.1. Origins 6585 4.2. Fundamentals of EF for Water Remediation 6586 4.2.1. Cell Configuration 6586 4.2.2. Cathodic Fe2+ Regeneration 6586 4.2.3. Anodic Generation of Heterogeneous Hydroxyl Radical 6587

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2,167 Citations

Journal ArticleDOI: 10.1021/CR9001319
Marco Panizza1, Giacomo Cerisola1Institutions (1)
06 Aug 2009-Chemical Reviews

1,561 Citations

Journal ArticleDOI: 10.1016/J.BIOTECHADV.2007.05.004
Zhuwei Du1, Haoran Li1, Tingyue Gu2Institutions (2)
Abstract: A microbial fuel cell (MFC) is a bioreactor that converts chemical energy in the chemical bonds in organic compounds to electrical energy through catalytic reactions of microorganisms under anaerobic conditions. It has been known for many years that it is possible to generate electricity directly by using bacteria to break down organic substrates. The recent energy crisis has reinvigorated interests in MFCs among academic researchers as a way to generate electric power or hydrogen from biomass without a net carbon emission into the ecosystem. MFCs can also be used in wastewater treatment facilities to break down organic matters. They have also been studied for applications as biosensors such as sensors for biological oxygen demand monitoring. Power output and Coulombic efficiency are significantly affected by the types of microbe in the anodic chamber of an MFC, configuration of the MFC and operating conditions. Currently, real-world applications of MFCs are limited because of their low power density level of several thousand mW/m2. Efforts are being made to improve the performance and reduce the construction and operating costs of MFCs. This article presents a critical review on the recent advances in MFC research with emphases on MFC configurations and performances.

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Topics: Microbial fuel cell (63%)

1,351 Citations

Open accessJournal ArticleDOI: 10.1016/J.PMATSCI.2013.03.005
S. Porada1, Ran Zhao2, A. van der Wal2, Volker Presser3  +2 moreInstitutions (4)
Abstract: Porous carbon electrodes have significant potential for energy-efficient water desalination using a promising technology called Capacitive Deionization (CDI). In CDI, salt ions are removed from brackish water upon applying an electrical voltage difference between two porous electrodes, in which the ions will be temporarily immobilized. These electrodes are made of porous carbons optimized for salt storage capacity and ion and electron transport. We review the science and technology of CDI and describe the range of possible electrode materials and the various approaches to the testing of materials and devices. We summarize the range of options for CDI-designs and possible operational modes, and describe the various theoretical–conceptual approaches to understand the phenomenon of CDI.

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Topics: Capacitive deionization (69%)

1,281 Citations

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