CHAPTER 11. Natural Clays/Clay Minerals and Modified Forms for Heavy Metals Removal

Kurniawan, Ade; Ismadji, Suryadi; Soetaredjo, Felycia Edi; Ayucitra, Aning

doi:10.1039/9781782620174-00213

Cited by 3 publications

(3 citation statements)

References 101 publications

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“…3, clays are formed by tetrahedral silica (T) and octahedral alumina (O) layers, which join with specific proportions 1:1 (TO) and 2:1 (TOT). [76][77][78] According to the characteristics of layer type, the clay minerals can be divided into two groups: 1:1-type clay mineral (like kaolin) and 2:1-type clay mineral (like montmorillonite). 79 Montmorillonite.-As the main component of bentonite, montmorillonite (MMT) is a kind of layered-clay mineral, belongs to the family of 2:1 phyllosilicate and its basic unit structure is composed from a sandwich of one aluminum oxy-octahedron between two siloxane tetrahedrons (Fig.…”

Section: Clay Mineral Materials and Layered Structurementioning

confidence: 99%

Review—Clay Mineral Materials for Electrochemical Capacitance Application

Zhang

Chai

et al. 2021

J. Electrochem. Soc.

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Electrochemical capacitors, also called supercapacitors (SCs), play an important role in the field of electrochemical energy storage and have great potential to become the most advanced power supply for portable electronic devices and electric vehicles. The performance of SCs depends mainly on the properties of the electrode material, and many novel electrode materials have been explored. Clay mineral materials, including montmorillonite, halloysite, and attapulgite, are potential electrode materials due to their layered structure, high specific surface area, natural abundance, low cost, and environmentally friendly nature. However, most of them suffer from low electronic conductivity, which limits their application as high-performance electrodes for SCs. Many efforts have been made to resolve this issue. Here, we summarize a series of clay mineral based electrode materials for SCs. To better develop clay minerals to produce green and pollution-free electrode materials, the structures and properties of minerals are also introduced. In addition, the challenges and prospects of clay mineral materials are also blueprinted.

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Section: Clay Mineral Materials and Layered Structurementioning

confidence: 99%

Review—Clay Mineral Materials for Electrochemical Capacitance Application

Zhang

Chai

et al. 2021

J. Electrochem. Soc.

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“…Talati and Patel [ 12 ] studied the effect of colourants and sweetening agents on copper corrosion in tartaric acid commonly present in various fruits and reported that all the food colourants and sweetening agents studied accelerate the corrosion of copper by tartaric acid. Adewuyi and Oladunjoye [ 40 ] studied the effects of sweeteners (glycerol, saccharin, glucose, and sucrose) and colourants (Carmoisine, Sunset Yellow, Poncreau 4R, and Tartazine) on tin-coated steel plates in malic acid and reported that while the sweetening agents inhibited corrosion, the colourants enhanced the corrosion of the tin-plated steels, and attributed the inhibitive effects of the sweeteners to the presence of hydroxyl groups that can form complexes with metal ions, which when insoluble can lead to corrosion inhibition [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ].…”

Section: Introductionmentioning

confidence: 99%

Comparative Gravimetric Studies on Carbon Steel Corrosion in Selected Fruit Juices and Acidic Chloride Media (HCl) at Different pH

Ofoegbu

2021

Materials

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Food contamination due to metal corrosion and the consequent leakage of metals into foods is a problem. Understanding the mechanism(s) of metal corrosion in food media is vital to evaluating, mitigating, and predicting contamination levels. Fruit juices have been employed as model corrosive media to study the corrosion behaviour of metallic material in food media. Carbon steel corrosion in fresh juices of tomato, orange, pineapple, and lemon, as well as dilute hydrochloric acid solutions at varied pH, was studied using scanning electron microscopy, gravimetric and spectrophotometric techniques, and comparisons made between the corrosivity of these juices and mineral acids of comparable pH. The corrosion of carbon steel in fruit juices and HCl solutions manifests as a combination of uniform and pitting corrosion. Gravimetric data acquired after one hour of immersion at ambient temperature (22 °C) indicated corrosion rates of 0.86 mm yr−1 in tomato juice (pH ≈ 4.24), 1.81 mm yr−1 in pineapple juice (pH ≈ 3.94), 1.52 mm yr−1 in orange juice (pH ≈ 3.58), and 2.89 mm yr−1 in lemon juice (pH ≈ 2.22), compared to 2.19 mm yr−1 in 10−2 M HCl (pH ≈ 2.04), 0.38 mm yr−1 in 10−3 M HCl (pH ≈ 2.95), 0.17 mm yr−1 in 10−4 M HCl (pH ≈ 3.95), and 0.04 mm yr−1 in 10−5 M HCl (pH ≈ 4.98). The correlation of gravimetrically acquired corrosion data with post-exposure spectrophotometric analysis of fruit juices enabled de-convolution of iron contamination rates from carbon steel corrosion rates in fruit juices. Elemental iron contamination after 50 h of exposure to steel samples was much less than the values predicted from corrosion data (≈40%, 4.02%, 8.37%, and 9.55% for tomato, pineapple, orange, and lemon juices, respectively, relative to expected values from corrosion (weight loss) data). Tomato juice (pH ≈ 4.24) was the least corrosive to carbon steel compared to orange juice (pH ≈ 3.58) and pineapple juice (pH ≈ 3.94). The results confirm that though the fruit juices are acidic, they are generally much less corrosive to carbon steel compared to hydrochloric acid solutions of comparable pH. Differences in the corrosion behaviour of carbon steel in the juices and in the different mineral acid solutions are attributed to differences in the compositions and pH of the test media, the nature of the corrosion products formed, and their dissolution kinetics in the respective media. The observation of corrosion products (iron oxide/hydroxide) in some of the fruit juices (tomato, pineapple, and lemon juices) in the form of apparently hollow microspheres indicates the feasibility of using fruit juices and related wastes as “green solutions” for the room-temperature and hydrothermal synthesis of metal oxide/hydroxide particles.

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“…Among the available adsorbents, clays, zeolites, and aluminosilicates are classified as the promising ones for heavy metals removal from aqueous systems. This is partly because of their great cation exchange capacity, low cost, high availability, high specific surface area, selectivity and regeneration capacity (Ismadji, Soetaredjo, and Ayucitra, 2015; Kurniawan et al, 2014;Novikova and Belchinskaya, 2016).…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal Adsorption From a Multimetal Solution by Bentonite-Kaolin-Zeolite Pellets: Linear and Nonlinear Regression, and Error Analysis

CARBONEL-RAMOS,

CHIRINOS,

AGARWAL

2021

PTQ

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Background: Heavy metal pollution has significant impacts on health and ecosystems; remediation technologies can reduce the cost to solve these problems. Heavy metals present a severe problem in the environment, mainly for their tendency to persist, bioaccumulate and biomagnification in the trophic chain. Removing these toxic compounds from wastewater remains a challenging task. Aim: Heavy metal removal capacity was analyzed using adsorbent pellets made with natural bentonite, kaolin, and zeolite. This study describes the equilibrium adsorption and kinetics of metal removal by using linear and nonlinear regression analysis. Adsorption mechanisms were also analyzed. Methods: The goodness of fit of the adsorption equilibrium data was tested with the four linearized forms of the Langmuir equation, as well as the Freundlich, Temkin, and Dubinin-Radushkevich models. To choose the best-fit model with greater reliability, five error functions were used: R2, X2, SSE, ABS, and ARE. For adsorption kinetics the Pseudo First Order, Pseudo Second Order and Elovich models were studied with linear and nonlinear regression analysis. Results and Discussion: Type I linearization of the Langmuir isotherm showed the best fit for the three metals, with maximum adsorption capacities for lead, copper, and cadmium of 7.27, 1.45 and 0.28 mg/L, respectively. The results show that Pseudo Second Order with linear regression best fitted for lead and copper data and Pseudo First Order model with linear regression for cadmium. Conclusions: Nonlinear regression was found better to fit adsorption equilibrium models and linear regression to fit kinetics models. The main mechanisms responsible for adsorption in the system are thought to be ion exchange between functional groups and cations and surface charge attraction related to Van der Waals forces.

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CHAPTER 11. Natural Clays/Clay Minerals and Modified Forms for Heavy Metals Removal

Cited by 3 publications

References 101 publications

Review—Clay Mineral Materials for Electrochemical Capacitance Application

Review—Clay Mineral Materials for Electrochemical Capacitance Application

Comparative Gravimetric Studies on Carbon Steel Corrosion in Selected Fruit Juices and Acidic Chloride Media (HCl) at Different pH

Heavy Metal Adsorption From a Multimetal Solution by Bentonite-Kaolin-Zeolite Pellets: Linear and Nonlinear Regression, and Error Analysis

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