Chemical Precipitation

Wang, Lawrence K.; Vaccari, David A.; Li, Yan; Shammas, Nazih K.

doi:10.1002/chin.200610241

Cited by 4 publications

(5 citation statements)

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“…1 show that the salts dissociate to produce metal species with various degrees of hydrolysis and charging. For example, the dominant species for copper are the positively charged Cu 2+ , CuOH + and at pH values less than 10 whereas they are negatively charged Cu(OH) 3 − and Cu(OH) 4 2− at pH values greater than 10. At and around pH 10, precipitation of neutral Cu(OH) 2 takes place.…”

Section: Dominant Species In Simulated Waste Watersmentioning

confidence: 99%

“…The amount of heavy metals is especially high in industrial waste waters and endanger public health and the environment if discharged without adequate treatment (Table 1). Methods such as chemical precipitation, solvent extraction, reverse osmosis, ultrafiltration, electrodialysis, ion exchange and adsorption are commonly used for this purpose [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Heavy metal removal from waste waters by ion flotation

Polat

Erdogan

2007

Journal of Hazardous Materials

265

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Flotation studies were carried out to investigate the removal of heavy metals such as copper (II), zinc (II), chromium (III) and silver (I) from waste waters. Various parameters such as pH, collector and frother concentrations and airflow rate were tested to determine the optimum flotation conditions. Sodium dodecyl sulfate and hexadecyltrimethyl ammonium bromide were used as collectors. Ethanol and methyl isobutyl carbinol (MIBC) were used as frothers. Metal removal reached about 74% under optimum conditions at low pH. At basic pH it became as high as 90%, probably due to the contribution from the flotation of metal precipitates.

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Section: Dominant Species In Simulated Waste Watersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heavy metal removal from waste waters by ion flotation

Polat

Erdogan

2007

Journal of Hazardous Materials

265

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“…Many approaches have been applied for the removal or recovery of metal ions from aqueous diluted solutions, such as chemical precipitation, solvent extraction, adsorption, and membrane technology . As far as rare earths are concerned, traditional solvent extraction is used extensively in the field of hydrometallurgy.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of rare earths (III) by calcium alginate-poly glutamic acid hybrid gels

Wang

Zhao

Wei

et al. 2013

J. Chem. Technol. Biotechnol.

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BACKGROUND: Adsorption is believed to be an effective and green technology for the removal and recovery of rare earths (III) from dilute solution. RESULTS:A novel hybrid gel, abbreviated as ALG-PGA, has been prepared through crosslinking calcium alginate (ALG) and γ -poly glutamic acid (PGA), and its adsorption behavior towards whole rare earths (III) has been examined. Taking Nd(III) as a representative element, the adsorption capacity, kinetics, reusability, selectivity and mechanism have been investigated. Cation exchange is proposed as a possible adsorption mechanism. Doping PGA molecules into calcium alginate beads can significantly enhance the adsorption capacity and the selectivity of rare earths from non-rare earths. The maximum adsorption capacity obtained for Nd(III) was 1.65 mmol g −1 . Reutilization of ALG-PGA gel was confirmed for up to eight consecutive sorption-desorption cycles with no damage to the gel. CONCLUSION: The prepared biosorbent, ALG-PGA, was biocompatible and cost effective with a good adsorption ability for Nd(III), and provides a new approach to the recovery of rare earths (III) from rare earths-containing wastewater.

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“…Chemical methods, which tend to be selective in molecular separations, can be classified into two major types: the first, discussed in this section, involves no electrochemistry (i.e., the established chemical methods), and the second, introduced in sections 1.3 and 2, is based on electrokinetic and electrochemical phenomena. Established chemical methods include precipitation, 41 coagulation flocculation, 42 adsorption, 43,44 ultraviolet, ozone, and chlorine disinfection, 45 aeration, 46 and ion exchange. 47,48 Precipitation involves the creation of a solid (the precipitate) from a solution using a chemical referred to as the precipitant.…”

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confidence: 99%

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

et al. 2022

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Agricultural development, extensive industrialization, and rapid growth of the global population have inadvertently been accompanied by environmental pollution. Water pollution is exacerbated by the decreasing ability of traditional treatment methods to comply with tightening environmental standards. This review provides a comprehensive description of the principles and applications of electrochemical methods for water purification, ion separations, and energy conversion. Electrochemical methods have attractive features such as compact size, chemical selectivity, broad applicability, and reduced generation of secondary waste. Perhaps the greatest advantage of electrochemical methods, however, is that they remove contaminants directly from the water, while other technologies extract the water from the contaminants, which enables efficient removal of trace pollutants. The review begins with an overview of conventional electrochemical methods, which drive chemical or physical transformations via Faradaic reactions at electrodes, and proceeds to a detailed examination of the two primary mechanisms by which contaminants are separated in nondestructive electrochemical processes, namely electrokinetics and electrosorption. In these sections, special attention is given to emerging methods, such as shock electrodialysis and Faradaic electrosorption. Given the importance of generating clean, renewable energy, which may sometimes be combined with water purification, the review also discusses inverse methods of electrochemical energy conversion based on reverse electrosorption, electrowetting, and electrokinetic phenomena. The review concludes with a discussion of technology comparisons, remaining challenges, and potential innovations for the field such as process intensification and technoeconomic optimization.

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Chemical Precipitation

Abstract: Inorganic chemistry Z 0100 Chemical Precipitation -[for water purification and waste water treatment; 98 refs.]. -(WANG, L. K.; VACCARI, D. A.; LI, Y.; SHAMMAS, N. K.; Handb. Environ. Eng. 3 (2005) 141-197; Zorex Corp., Newtonville, New York, NY, USA; Eng.) -Schramke 10-241

Cited by 4 publications

References 1 publication

Heavy metal removal from waste waters by ion flotation

Heavy metal removal from waste waters by ion flotation

Adsorption of rare earths (III) by calcium alginate-poly glutamic acid hybrid gels

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

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