Arsenic sorption on zero-valent iron-biochar complexes

Bakshi, Santanu; Banik, Chumki; Rathke, Samuel J.; Laird, David A.

doi:10.1016/j.watres.2018.03.021

Cited by 241 publications

(65 citation statements)

References 67 publications

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“…A C/N combustion analyzer was used to determine elemental content (C, H, N, and S) of biochars [22]. Biochar properties such as moisture content, volatile matter, fixed carbon, and ash content were measured according to method Rover et al [23].…”

Section: Biochar Propertiesmentioning

confidence: 99%

The-Proof-of-Concept of Biochar Floating Cover Influence on Water pH

Meiirkhanuly

Kozieł

Białowiec

et al. 2019

Water

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Studies have shown that biochar has the potential to remove organic and inorganic contaminants from wastewater. pH is known to have a crucial role in the transformation of pollutants. In this research, we explore the feasibility of using biochars properties to control the pH near the water-air interface, so the gaseous emissions from water (or wastewater) could be mitigated. This study aimed to test the effects of a thin layer biochar addition on the spatial and temporal variation of water pH. Two types of biochar and water were tested. Highly alkaline porous (HAP; pH 9.2) biochars made of corn stover and red oak (RO; pH 7.5) were applied surficially to tap (pH 9.5) and deionized water (DI) (pH 5.4). The spatial pH of solutions was measured every 1 mm of depth on days 0, 2, and 4 after biochar application. The results showed that HAP biochar increased the pH of both tap and DI water, while RO decreased tap water pH and increased DI water pH. On day 0, there was no effect on tap water pH, while a pH change in DI water was observed due to its lower buffer capacity. In addition, the pH (temporal) migration from topically applied biochar into an aqueous solution was visualized using a colorimetric pH indicator and corn starch to increase viscosity (to prevent biochars from sinking). The results prove that the surficial application of biochar to water was able to change both the pH near the water-air interface and the pH of the solution with time. The pH change was dependent on the biochar pH and water buffer capacity. These results warrant further research into the floatability of biochars and into designing biochars with specific pH, which could be a factor influencing gaseous emissions from liquids that are sensitive to pH.

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Section: Biochar Propertiesmentioning

confidence: 99%

The-Proof-of-Concept of Biochar Floating Cover Influence on Water pH

Meiirkhanuly

Kozieł

Białowiec

et al. 2019

Water

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“…Kolodynska and Bak, 2018;Yang et al, 2018b) as well as As (e.g. Bakshi et al, 2018;He et al, 2018;Zhou et al, 2014). However, the combination of biochar and iron as a treatment for remediation of multi-element contamination of soils and other media is less well studied (Lu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Assessment of biochar and zero-valent iron for in-situ remediation of chromated copper arsenate contaminated soil

Frick

Tardif

Kandeler

et al. 2019

Science of The Total Environment

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Highlights  Chromate copper arsenate (CCA) contaminated soils pose risks to the environment  In-situ stabilization of CCA contaminated soil was tested with biochar and ZVI  Soil remediation was evaluated based on chemical and microbiological techniques  Biochar reduced bioavailable (Cu bio), but not water-extractable Cu (Cu water)  Combination of biochar and ZVI most effectively reduced toxic effects of CCA

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“…Arsenic (As) is a highly toxic element to both humans and animals and one of the most hazardous substances in the environment [1]. Arsenic exists primarily in two oxidation forms: arsenate (As(V)) and arsenite (As(III)).…”

Section: Introductionmentioning

confidence: 99%

“…However, most of these methods have drawbacks, including high costs, deficient removal, generation of waste products, or high reagent and energy requirement. Among the methods mentioned earlier, adsorption seems to be the most effective method [1,12]. For removal by adsorption technique, activated carbon, metal-organic frameworks, zeolites, bog iron ores, water treatment residuals, and activated alumina have been proven to be promising adsorbents for arsenic removal [13][14][15][16][17].Clay minerals are low-cost and nontoxic sorbents.…”

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confidence: 99%

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

et al. 2019

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Among the various technologies tested for removing the anionic species resulting from arsenic contamination, sorption methods have received unflagging interest. Being potential sorbent materials, clay minerals modified by cationic surfactants are often examined for this purpose. Among the clay minerals tested, information regarding sorption properties of expanded vermiculite modified with surfactants is scarce. Therefore, the present study aims to prepare organo-vermiculites modified with hexadecyltrimethylammonium (HDTMA) and benzyldimethylhexadecylammonium (HDBA) at surfactant concentrations of 0.5, 1.0, and 2.0 cation exchange capacity. Modified sorbents were identified and characterized using the analytical methods that can determine phase composition and textural properties of the samples. The sorption of As(III) and As(V) as a function of initial pH value, initial concentration of As(III, V), and initial dosage of sorbent was investigated. The results show that HDTMA and HDBA affect the properties of raw vermiculite. For instance, increase in the concentration of surfactants is often accompanied by a change in interlayer space or textural properties of vermiculite. It was observed that tested organo-minerals adsorbed As(V) to a greater extent compared to As(III). Various analytical studies were carried out and the results revealed the successful synthesis of organo-vermiculite. Moreover, the study also showed that the structure of organo-vermiculite has a significant impact on the uptake of As(III) and As(V) anions.In the last decades, various technologies for removing As from contaminated water have been investigated, such as oxidation, coagulation, ion exchange, precipitation, membrane filtration, biological treatment, and sorption [9][10][11]. However, most of these methods have drawbacks, including high costs, deficient removal, generation of waste products, or high reagent and energy requirement. Among the methods mentioned earlier, adsorption seems to be the most effective method [1,12]. For removal by adsorption technique, activated carbon, metal-organic frameworks, zeolites, bog iron ores, water treatment residuals, and activated alumina have been proven to be promising adsorbents for arsenic removal [13][14][15][16][17].Clay minerals are low-cost and nontoxic sorbents. Raw clays are able to sorb cations owing to their negatively charged surface; however, they display low sorption efficiency for negatively charged contaminants such as arsenic [18]. Nevertheless, clays can be chemically modified by organic surfactants, which change the charge on the clay surface from negative to positive [19]. The organo-clays are hydrophobic materials that can effectively sorb anions and organic compounds. Modified kaolinite, montmorillonite, and illite are the most popular clay minerals that are used as sorbents [20][21][22]. However, only a few studies have focused on using organo-vermiculites to sorb anions [23,24].Vermiculite is a 2:1 phyllosilicate mineral having a sandwiched structure with two tetrahedral shee...

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Arsenic sorption on zero-valent iron-biochar complexes

Cited by 241 publications

References 67 publications

The-Proof-of-Concept of Biochar Floating Cover Influence on Water pH

The-Proof-of-Concept of Biochar Floating Cover Influence on Water pH

Assessment of biochar and zero-valent iron for in-situ remediation of chromated copper arsenate contaminated soil

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

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