Individual and competitive removal of heavy metals using capacitive deionization

Huang, Zuhao; Lu, Lu; Cai, Zhenxiao; Ren, Zhiyong Jason

doi:10.1016/j.jhazmat.2015.09.064

Cited by 181 publications

(66 citation statements)

References 37 publications

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“…There are several possibilities that caused degraded desorption performance with the repeated cycles of MCDI, such as electro-oxidation, physical adsorption of ions, and scale formation. 36,[42][43] However, those reasons seem not to be the main cause of the significantly reduced desorption efficiency with the repeated cycles in this study, whereas the adsorption capacity of the carbon electrode was quite stable. The desorption efficiency in the primary desorption step in each cycle was notably decreased as the concentration of the Pd concentrate increased with repeated cycles.…”

Section: Effect Of Concentration Of Concentrate Solution On Pd Desorpmentioning

confidence: 58%

Palladium Recovery through Membrane Capacitive Deionization from Metal Plating Wastewater

Kim

Gwak

Dorji

et al. 2017

ACS Sustainable Chem. Eng.

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The potential application of membrane capacitive deionization (MCDI) for recovery of palladium (Pd) ions from catalyst solution wastewater generated from plating industry was investigated in this study. Several major issues were explored in this work to verify the suitability of MCDI for Pd recovery from a practical perspective: adsorption and desorption efficiencies, desorption mechanisms into high concentration of Pd concentrate, and its sustainability in long-term operation. The lab-scale MCDI operation achieved satisfactory and highly competitive Pd removal (99.07-99.94% removal with 1.42-1.52 of Pd selectivity over ammonium ions) showing that Pd can be effectively collected from plating industry wastewater. High concentration of Pd concentrate (64.77 and 919.44 mg/L of Pd from the 10 and 100 mg/L Pd containing catalyst solution, respectively) was obtained through successive five operation cycles of adsorption/desorption phases. However, it is significant to note that the desorption efficiency was inversely proportional to the concentration of Pd concentrate which is likely due to the Pd ions discharged from carbon electrode toward Pd solution against the enhanced concentration gradient. The long-term operation results suggest that scaling could reduce the MCDI efficiency during Pd recovery (0.17% decrease in Pd removal for every cycle on average) and hence may require adequate electrode cleaning regime.

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Section: Effect Of Concentration Of Concentrate Solution On Pd Desorpmentioning

confidence: 58%

Palladium Recovery through Membrane Capacitive Deionization from Metal Plating Wastewater

Kim

Gwak

Dorji

et al. 2017

ACS Sustainable Chem. Eng.

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“…The United States Environmental Protection Agency (EPA) and the United States Geological Survey (USGS) examined treated and untreated water samples from approximately 25 different water treatment plants and reported~250 microbiological and chemical contaminants [2]. A wide range of technologies is used for wastewater treatment, including biological treatment, chemical precipitation, phytoremediation, membrane removal, and ion exchange [3][4][5]. However, these treatments require significant operating, maintenance, and energy costs, and do not always show a sufficient removal of Pine woodchip Jarrah Activated carbon [19] laboratory Cu and Zn removal 7.79 9.43 9.93…”

Section: Introductionmentioning

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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“…(Gao et al 2015) and operating conditions (such as cell voltage, electrode distance, retention time, solution conductivity, etc.) Kim 2013, 2014;Huang et al 2016). When the ion storage capacity is reached, a desorption (electrode regeneration) process is needed to release the ions, resulting in a stream concentrated in salt.…”

Section: Introductionmentioning

confidence: 99%

Effect of Desorption Methods on Electrode Regeneration Performance of Capacitive Deionization

Yao¹,

Tang

2017

J. Environ. Eng.

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Long regeneration time and substantial water usage in desorption cycles impose potential barriers for practical applications of capacitive deionization (CDI). In this research, a single-pass continuous-flow CDI cell was used to explore the effect of desorption methods on electrode regeneration performance. The results demonstrated effective nature of polarity reversal during electrode regeneration compared to the conventional short-circuit method. A reversed polarity with optimized duration and magnitude of cell voltage while purging with a proper flow scheme exhibited substantial reductions on regeneration time and flush-water usage during the desorption processes of CDI. The beneficial aspects of preferred desorption methods were attributable to minimization of a readsorption effect by limiting the rate of ion transport to the oppositely charged electrode. The results of this research are beneficial for improving the operational efficiency and cost-effectiveness of CDI systems for engineering applications. ; separate discussions must be submitted for individual papers. This paper is part of the Journal of Environmental Engineering, © ASCE, ISSN 0733-9372. © ASCE 04017047-1 J. Environ. Eng. J. Environ. Eng., 2017, 143(9): -1--1 Downloaded from ascelibrary.org by Hao Tang on 05/10/17. Copyright ASCE. For personal use only; all rights reserved. © ASCE 04017047-3 J. Environ. Eng. J. Environ. Eng., 2017, 143(9): -1--1 Downloaded from ascelibrary.org by Hao Tang on 05/10/17. Copyright ASCE. For personal use only; all rights reserved. © ASCE 04017047-6 J. Environ. Eng. J. Environ. Eng., 2017, 143(9): -1--1 Downloaded from ascelibrary.org by Hao Tang on 05/10/17.

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Individual and competitive removal of heavy metals using capacitive deionization

Cited by 181 publications

References 37 publications

Palladium Recovery through Membrane Capacitive Deionization from Metal Plating Wastewater

Palladium Recovery through Membrane Capacitive Deionization from Metal Plating Wastewater

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

Effect of Desorption Methods on Electrode Regeneration Performance of Capacitive Deionization

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