Fast and efficient removal of Cr(VI) to ppb level together with Cr(III) sequestration in water using layered double hydroxide interclated with diethyldithiocarbamate

Zhang, Lixun; He, Fangxin; Mao, Wei; Guan, Yuntao

doi:10.1016/j.scitotenv.2020.138701

Cited by 35 publications

(8 citation statements)

References 56 publications

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“…When the ΔG 0 values are between −20 and 0 kJ•mol −1 or the absolute ΔH 0 values are between 2.1 and 20.9 kJ•mol −1 , the physical adsorption dominates in the adsorption process. 13,45 Therefore, the main adsorption mechanisms of NH 4 + −N onto the PAA/CTS/BC were physical adsorption, and this result is in line with the good fitting of the Langmuir isotherm model. As discussed below, the acting force of physical adsorption for NH 4 + −N removal is mainly an electrostatic interaction with abundant carboxyl groups (−COO) of the PAA/CTS/BC.…”

Section: ■ Introductionsupporting

confidence: 75%

“…Langmuir (eq ) and Freundlich models (eq ) were used to simulate the isotherm data. Thermodynamic parameters, i.e., Gibbs energy (Δ G 0 , kJ·mol –1 ), standard entropy change (Δ S 0 , kJ·mol –1 ·K –1 ), and standard enthalpy change (Δ H 0 , kJ·mol –1 ) of NH 4 + –N adsorption onto the PAA/CTS/BC were further investigated through thermodynamic models (eqs –) . Notably, the Langmuir bonding term (L/mg) was applied to estimate the thermodynamic parameters in the models.…”

Section: Methodsmentioning

confidence: 99%

“…Thermodynamic parameters, i.e., Gibbs energy (ΔG 0 , kJ•mol −1 ), standard entropy change (ΔS 0 , kJ• mol −1 •K −1 ), and standard enthalpy change (ΔH 0 , kJ•mol −1 ) of NH 4 + − N adsorption onto the PAA/CTS/BC were further investigated through thermodynamic models (eqs 3−5). 13 Notably, the Langmuir bonding term (L/mg) was applied to estimate the thermodynamic parameters in the models. The adsorption kinetics of NH 4 + −N onto the PAA/CTS/BC was investigated with an initial NH 4 + −N concentration of 100 mg•L −1 for different time intervals (0−24 h).…”

Section: ■ Introductionmentioning

confidence: 99%

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Excellent Adsorption–Desorption of Ammonium by a Poly(acrylic acid)-Grafted Chitosan and Biochar Composite for Sustainable Agricultural Development

Zhang

Tang

Guan

2020

ACS Sustainable Chem. Eng.

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The discovery of materials as soil conditioners for the improvement of soil nitrogen-use efficiency provides a promising strategy for simultaneously addressing production and pollution problems in agriculture. Herein, adsorption–desorption performance and mechanisms of ammonium (NH4 +–N) by a poly(acrylic acid)-grafted chitosan and biochar composite (PAA/CTS/BC) were studied to evaluate its potential in soil amendment. Furthermore, mathematical models were further applied to explore the effects of PAA/CTS/BC on controlling soil NH4 +–N loss. Results suggest that PAA/CTS/BC showed a high capacity of NH4 +–N adsorption, with a maximum value of 149.25 mg·g–1 at 25 °C, considerably higher than most of the reported BC-based adsorbents. Fast adsorption of NH4 +–N was completed with an efficiency of >90% within 20 min, primarily attributed to the dominant electrostatic interactions with carboxyl groups. Adsorbed NH4 +–N was capable of being easily re-released with the variation of the liquid-phase concentration because of the weak binding of NH4 +–N with the material. These results demonstrate that the PAA/CTS/BC can be considered as a nitrogen slow-release medium to dynamically maintain a plant-available NH4 +–N concentration in the soil. Finally, the mathematical simulation of NH4 +–N flow in the PAA/CTS/BC-amended soil revealed that soil NH4 +–N loss was effectively reduced by 24.18–31.77% at a 1.57–2.02% material dosage during a 10-week rice cultivation.

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Section: ■ Introductionsupporting

confidence: 75%

Section: Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Excellent Adsorption–Desorption of Ammonium by a Poly(acrylic acid)-Grafted Chitosan and Biochar Composite for Sustainable Agricultural Development

Zhang

Tang

Guan

2020

ACS Sustainable Chem. Eng.

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“…Lee et al (2019) in their research used Mg/Al-biochar for phosphate adsorption with an adsorption capacity of 70.75 mg/g. Research conducted by Zhang et al (2020) using Mg/Al intercalated diethyldithiocarbamate as a Cr(VI) adsorbent resulted in an adsorption capacity of 52.00 mg/g. Another layered double hydroxide use is Cu/Al modi ed using biochar from rice husk with increased adsorption capacity from 22.272 mg/g to 384.615 mg/g (Palapa et al, 2021) .…”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxide/C (C=Humic Acid;Hydrochar) As Adsorbents of Cr(VI)

Siregar

Wijaya

Amri

et al. 2022

Sci.Technol.Indonesia

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Layered double hydroxide (LDH) is known as a layered material that can be used as an adsorbent to remove pollutants from aqueous solutions. The use of layered double hydroxide as an adsorbent is not very effective due to its structure which is easily damaged so that it cannot be reused and its small surface area which results in a small adsorption capacity. This can be overcome by developing layered double hydroxide into a composite material. Modification of layered double hydroxide is done by using supporting materials in the form of humic acid and hydrochar. In this study the adsorbent was applied in the removal of Cr(VI) metal from aqueous solutions. The layered double hydroxide modification process was successfully carried out as seen from the XRD, FTIR, and BET analysis. XRD analysis shows the peaks that appear in Mg/Al-AH and Mg/Al-HC are peaks composed of their constituent materials, namely Mg/Al LDH, humic acid, and hydrochar. The vibrations that appear in Mg/Al-AH and Mg/Al-HC are vibrations originating from Mg/Al, humic acid, and hydrochar. The layered double hydroxide material composited with humic acid showed a surface area from 2.155 m2/g to 3.337 m2/g. The layered double hydroxide material composited with hydrochar showed a larger surface area than the Mg/Al LDH base material. The surface area increased 37 times, from 2.155 m2/g to 74.207 m2/g. The Mg/Al-AH composite showed the first adsorption ability of 89.064% and there was no significant decrease in the next cycle. The Mg/Al-HC composite showed adsorption ability in the first cycle which reached 97.079%, the ability to survive up to the fifth cycle with a final ability of 75.029%.

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“…However, Cr (III) is less mobile, more stable, and almost nontoxic, compared to Cr (VI). Thus, reducing Cr (VI) to Cr (III) is considered a significantly effective approach for removing chromium [2]. Among the various chromium removal methods, biological conversion (especially using bacteria and fungi) has been proven to be attractive and cost-effective because of its high efficiency, low operating cost, short operation time, and eco-friendliness [3,4].…”

Section: Introductionmentioning

confidence: 99%

External Carbon Source Facilitates Indirect Cr (VI) Bioreduction Process by Anaerobic Sludge Produced from Kitchen Waste

et al. 2021

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This study presented the investigation on indirect Cr (VI) bioreduction process by anaerobic sludge produced from kitchen waste (ASKW) using an external source of glucose and sulfate to favor the reducing environment. These compounds were added at the beginning of the experiment along with 500 mg·L−1 Cr (VI). The system containing 1 g of glucose and 2 g of sulfate attained a higher reduction, which was 10% higher than that of the control experiment. This study indicated that a neutral environment (pH ~7), along with a high release of polysaccharides (PS), improved the removal efficiency by Cr (VI) bioreduction process. Desulfovibrio and Sulfurospirillum (genus level), which accounted for 3% and 1% of the whole microorganism, respectively, were responsible for the sulfidogenic reaction. Additionally, Thermovirga (genus level) reduced from 14% to 11% and 10%. These microorganisms contributed to dominating the indirect Cr (VI) bioreduction process. SEM and FTIR analysis of the sludges obtaining from the indirect Cr (VI) bioreduction systems indicated that the external glucose could facilitate the formation of looser porous structures and richer functional groups of sludges, thus adsorbing more Cr (III) to reduce its toxicity. Meanwhile, the intensity of the hydroxyl bond, which possesses strong reducibility, was much higher after adding external glucose. Chromate reductase gene (chrR) and sulfite reductase gene (dsrA) contributed to the indirect Cr (VI) bioreduction process. These might be the main mechanisms of the external glucose acting on indirect Cr (VI) bioreduction by ASKW.

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Fast and efficient removal of Cr(VI) to ppb level together with Cr(III) sequestration in water using layered double hydroxide interclated with diethyldithiocarbamate

Cited by 35 publications

References 56 publications

Excellent Adsorption–Desorption of Ammonium by a Poly(acrylic acid)-Grafted Chitosan and Biochar Composite for Sustainable Agricultural Development

Excellent Adsorption–Desorption of Ammonium by a Poly(acrylic acid)-Grafted Chitosan and Biochar Composite for Sustainable Agricultural Development

Layered Double Hydroxide/C (C=Humic Acid;Hydrochar) As Adsorbents of Cr(VI)

External Carbon Source Facilitates Indirect Cr (VI) Bioreduction Process by Anaerobic Sludge Produced from Kitchen Waste

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