Electrochemical treatment of wastewater: Selectivity of the heavy metals removal process

Tran, Thien-Khanh; Chiu, Kuo-Feng; Lin, Chiu‐Yue; Leu, Hoang-Jyh

doi:10.1016/j.ijhydene.2017.05.156

Cited by 172 publications

(53 citation statements)

References 18 publications

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“…Under the optimum conditions (contact time = 2.4 h, pH = 4.1, initial Mo concentration = 28.5 mg/L), the Mo removal rate was approximately 59.5%. Tran et al [ 36 ] investigated metal elimination from an aqueous solution by the EO method at a voltage of 10 V. Their investigation showed a high performance in removing metals, but the selected voltage (10 V) and reaction time (20 h) were higher than the our findings.…”

Section: Resultscontrasting

confidence: 73%

Pollutant Removal from Synthetic Aqueous Solutions with a Combined Electrochemical Oxidation and Adsorption Method

Mojiri

Ohashi

Ozaki

et al. 2018

IJERPH

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Eliminating organic and inorganic pollutants from water is a worldwide concern. In this study, we applied electrochemical oxidation (EO) and adsorption techniques to eliminate ammonia, phenols, and Mo(VI) from aqueous solutions. We analyzed the first stage (EO) with response surface methodology, where the reaction time (1–3 h), initial contaminant concentration (10–50 mg/L), and pH (3–6) were the three independent factors. Sodium sulfate (as an electrolyte) and Ti/RuO2–IrO2 (as an electrode) were used in the EO system. Based on preliminary experiments, the current and voltage were set to 50 mA and 7 V, respectively. The optimum EO conditions included a reaction time, initial contaminant concentration, and pH of 2.4 h, 27.4 mg/L, and 4.9, respectively. The ammonia, phenols, and Mo elimination efficiencies were 79.4%, 48.0%, and 55.9%, respectively. After treating water under the optimum EO conditions, the solution was transferred to a granular composite adsorbent column containing bentonite, limestone, zeolite, cockleshell, activated carbon, and Portland cement (i.e., BAZLSC), which improved the elimination efficiencies of ammonia, phenols, and molybdenum(VI) to 99.9%. The energy consumption value (8.0 kWh kg−1 N) was detected at the optimum operating conditions.

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Section: Resultscontrasting

confidence: 73%

Pollutant Removal from Synthetic Aqueous Solutions with a Combined Electrochemical Oxidation and Adsorption Method

Mojiri

Ohashi

Ozaki

et al. 2018

IJERPH

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“…Several techniques have been developed to treat wastewater containing heavy metal ions,− including sorption,− precipitation, ion exchange, membrane separation, and electrochemical treatment . Among these methods, sorption is generally recognized as the most popular method because of its simplicity, high efficiency, low cost, and wide adaptability .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Layered Double Hydroxide/Silica Foam Nanocomposites and Their Application for Removing Pb(II) and Cr(VI) from Aqueous Solutions

et al. 2019

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In the current work, nanocomposites of Mg−Al and Mg−Fe layered double hydroxides (LDHs) anchored on silica foam (SF), denoted as MAL/SF and MFL/SF, respectively, were fabricated using a two‐step route. The obtained LDHs/SF nanocomposites were characterized by XRD, TEM, SEM, EDS, elemental mapping, and N2 adsorption‐desorption techniques. Sorption of the heavy‐metal Pb(II) and Cr(VI) on the LDHs/SF was determined at 25 °C and pH 5.5 using a batch technique. In comparison with bulk Mg−Al and Mg−Fe LDHs, the LDHs in the MAL/SF and MFL/SF exhibit significantly enhanced sorption capacities. In addition, the LDHs/SF nanocomposites show a good recyclability for removing heavy metals. The construction of LDHs/SF nanocomposites is an effective strategy for improving the sorption capacity of LDHs, and the nanocomposites are potential sorbents for wastewater treatment.

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“…Chromium is frequently encountered heavy metal in wastewaters due to its various industrial applications including textile dying, tanneries, metallurgy, metal electroplating and wood preserving [1,2]. In the past, numerous studies including adsorption [3] coagulation-sedimentation, chemical precipitation [4], biosorption [5], ion exchange [6], reverse osmosis [7], electrodialysis [8], ion exchange-assisted membrane [9,10], and electrochemical [11] techniques were conducted to combat heavy metals contamination issue. Recently, Polymer Inclusion Membranes (PIMs) process has been widely and successfully used for metal ion extraction, separation of inorganic species, biochemical and biomedical applications [12].…”

Section: Introductionmentioning

confidence: 99%

Soft computing techniques in prediction Cr(VI) removal efficiency of polymer inclusion membranes

Yaqub

Eren

Eyüpoğlu

2019

Environmental Engineering Research

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In this study soft computing techniques including, Artificial Neural Network (ANN) and Adaptive Neuro-Fuzzy Inference System (ANFIS) were investigated for the prediction of Cr(VI) transport efficiency by novel Polymer Inclusion Membranes (PIMs). Transport experiments carried out by varying parameters such as time, film thickness, carrier type, carier rate, plasticizer type, and plasticizer rate. The predictive performance of ANN and ANFIS model was evaluated by using statistical performance criteria such as Root Mean Standard Error (RMSE), Mean Absolute Error (MAE), and Coefficient of Determination (R 2). Moreover, Sensitivity Analysis (SA) was carried out to investigate the effect of each input on PIMs Cr(VI) removal efficiency. The proposed ANN model presented reliable and valid results, followed by ANFIS model results. RMSE and MAE values were 0.00556, 0.00163 for ANN and 0.00924, 0.00493 for ANFIS model in the prediction of Cr(VI) removal efficiency on testing data sets. The R 2 values were 0.973 and 0.867 on testing data sets by ANN and ANFIS, respectively. Results show that the ANN-based prediction model performed better than ANFIS. SA demonstrated that time; film thickness; carrier type and plasticizer type are major operating parameters having 33.61%, 26.85%, 21.07% and 8.917% contribution, respectively.

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Electrochemical treatment of wastewater: Selectivity of the heavy metals removal process

Cited by 172 publications

References 18 publications

Pollutant Removal from Synthetic Aqueous Solutions with a Combined Electrochemical Oxidation and Adsorption Method

Pollutant Removal from Synthetic Aqueous Solutions with a Combined Electrochemical Oxidation and Adsorption Method

Fabrication of Layered Double Hydroxide/Silica Foam Nanocomposites and Their Application for Removing Pb(II) and Cr(VI) from Aqueous Solutions

Soft computing techniques in prediction Cr(VI) removal efficiency of polymer inclusion membranes

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