Advancements in heavy metals removal from effluents employing nano-adsorbents: Way towards cleaner production

Janani, R.; Baskar, G.; Sivakumar, K.; Varjani, Sunita; Ngo, Huu Hao; Gnansounou, Edgard

doi:10.1016/j.envres.2021.111815

Cited by 66 publications

(4 citation statements)

References 147 publications

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“…As discussed earlier, optimum dilution of HTWW is essential to support growth of microalgae which is majorly owing to the presence of recalcitrant and toxic compounds such as phenol and its derivatives, heterocyclic nitrogenous compounds, heavy metals, emerging contaminants like dibutyl phthalate known to inhibit the growth [66,92]. Phenol derivatives with chlorine, methyl and ethyl groups have shown higher toxicity than phenol in the culture of Pseudokirchneriella subcapitata [93].…”

Section: Challenges In Using Htww To Grow Microalgaementioning

confidence: 99%

Recent Advancements in Microalgal Mediated Valorisation of Wastewater from Hydrothermal Liquefaction of Biomass

et al. 2022

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Hydrothermal liquefaction (HTL) is an evolving technology that can convert waste with high moisture and low energy content to electricity, heat, hydrogen and other synthetic fuels more efficiently. The lee Review article side is that the HTL process produces enormous amounts of wastewaters (HTWW), having high organic and nutrient load. The discharge of the HTWW would contaminate the environment and result in the loss of valuable bioenergy sources. The valorization of HTWW has drawn considerable interest. Therefore, this review highlights the valorization of wastewater during the HTL of biomass. The review paper begins with the discussion of the role of microalgae in valorizing the HTWW. The survey illustrates that the selection of appropriate technology is dependent on biomass characteristics of the microalgae. Finally, potential research opportunities are recommended to improve the viability of the HTL wastewater valorization for bioenergy production. Overall, this review concludes that combining various processes, such as microalgae-anaerobic digestion, and bio-electrochemical system -microalgae-anaerobic digestion would be beneficial in maximizing HTWW valorization.

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Section: Challenges In Using Htww To Grow Microalgaementioning

confidence: 99%

Recent Advancements in Microalgal Mediated Valorisation of Wastewater from Hydrothermal Liquefaction of Biomass

et al. 2022

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“…Whereas, the difficult separation revealed the disadvantage of nanomaterials for adsorption. To solve the question, magnetic nanomaterials are used for adsorption, and they can be facilely separated from wastewater with an external magnetic field [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Adsorption Characteristics and Electrochemical Behaviors of Methyl Blue onto Magnetic Mg_xCo_yZn_(1-x-y)Fe₂O₄ Nanoparticles

Yang

Han

et al. 2023

Adsorption Science & Technology

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Magnetic MgxCoyZn(1-x-y)Fe2O4 nanoparticles were successfully prepared by the rapid combustion approach, and SEM, XRD, VSM, EDX, and FTIR techniques were applied for their characterization. The influence of the element ratios (Mg2+, Co2+, and Zn2+) in magnetic MgxCoyZn(1-x-y)Fe2O4 nanoparticles on their properties was explored. To acquire a larger specific surface area for better adsorption of methyl blue (MB), magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles calcined at 400°C for 2 h with 25 mL anhydrous ethanol were selected, and their average particle size and the saturation magnetization were about 81.3 nm and 13.5 emu·g-1, respectively. Adsorption kinetics models and adsorption isotherm models were applied to research the adsorption characteristics of MB onto magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles. The pseudo-second-order kinetics model ( R 2 > 0.99 ) and Temkin isotherm model ( R 2 = 0.9887 ) were the most consistent with the data, indicating that the adsorption was the chemical multilayer adsorption mechanism, and the process was an exothermic reaction. The E of the Dubinin-Radushkevich (D-R) isotherm model was 0.2347 KJ·mol-1, indicating the adsorption involved physical adsorption besides chemical adsorption. The Δ G 0 and Δ H 0 ( Δ H 0 = − 10.38 KJ·mol-1) of the adsorption process of MB adsorbed onto magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles measured through the thermodynamic experiment were both less than 0, which proved that the process was a spontaneous exothermic reaction. The adsorption capacity of MB onto magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles increased with the pH of MB solution increasing from 2 to 4 at room temperature, and it had no significant change when the pH of MB solution was 4-12, while the relative removal rate was 98.75% of the first one after 2 cycles. The electrochemical impedance spectroscopy (EIS) and the cyclic voltammetry (CV) data further demonstrated that MB was adsorbed onto magnetic Mg0.4Co0.5Zn0.1Fe2O4 nanoparticles.

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“…The suitability of absorption for employment in wastewater remediation lies in its versatile nature, broad application potential, economic viability, and ease of use. Therefore, it stands out among other common physical, chemical, and biological approaches [13,14]. From a scientific perspective, adsorption is a phenomenon arising due to both physical and chemical interactions, often described as the adherence of molecules onto the surfaces of the adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Selective Adsorption of Methyl Orange Dye by Novel Synthetic Crosslinked-Polydopamine/Polyaniline Nanoparticles

Gholizadeh,

Haddadi-Asl,

Ahmadi

et al. 2023

Preprint

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A novel technique known as water-in-water emulsion was utilized to synthesize the cross-linked nanoparticles of polydopamine@polyaniline (CPDA@PANI). The synthesized nanoparticles demonstrated their ability to selectively adsorb methyl orange (MO) from aqueous media. Solution pH and contact time are the influential factors employed to ascertain the optimal conditions for organic dye adsorption. Both pseudo-first and pseudo-second-order kinetic models were utilized to fit the adsorption kinetics. Four isothermal adsorption models were used to find the adsorption kinetics model, including Dubnin-Radushkevich, Temkin, Freundlich, and Harkins-Jura. The results revealed that the nanoparticles presented a higher adsorption capacity of 114.48 mgr/gr in acidic medium than in alkaline conditions with dye removal efficiency of 95.4%. This phenomenon can be explained by protonating PANI, which leads to a strong electrostatic attraction between amino and imine groups with MO. By conforming to the pseudo-second-order kinetics model, the adsorption kinetics process displayed a favorable fit, and it was found that the Freundlich isotherm model was more effective for monitoring and assessing adsorption behavior than other available models. It can be derived from this analysis that the absorption of the dye in CPDA@PANI nanoparticles can be categorized as a single-layer adsorption process with homogeneous absorption sites on the nanoparticles.

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Advancements in heavy metals removal from effluents employing nano-adsorbents: Way towards cleaner production

Cited by 66 publications

References 147 publications

Recent Advancements in Microalgal Mediated Valorisation of Wastewater from Hydrothermal Liquefaction of Biomass

Recent Advancements in Microalgal Mediated Valorisation of Wastewater from Hydrothermal Liquefaction of Biomass

Adsorption Characteristics and Electrochemical Behaviors of Methyl Blue onto Magnetic Mg_xCo_yZn_(1-x-y)Fe₂O₄ Nanoparticles

Selective Adsorption of Methyl Orange Dye by Novel Synthetic Crosslinked-Polydopamine/Polyaniline Nanoparticles

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Advancements in heavy metals removal from effluents employing nano-adsorbents: Way towards cleaner production

Cited by 66 publications

References 147 publications

Recent Advancements in Microalgal Mediated Valorisation of Wastewater from Hydrothermal Liquefaction of Biomass

Recent Advancements in Microalgal Mediated Valorisation of Wastewater from Hydrothermal Liquefaction of Biomass

Adsorption Characteristics and Electrochemical Behaviors of Methyl Blue onto Magnetic MgxCoyZn(1-x-y)Fe2O4 Nanoparticles

Selective Adsorption of Methyl Orange Dye by Novel Synthetic Crosslinked-Polydopamine/Polyaniline Nanoparticles

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Adsorption Characteristics and Electrochemical Behaviors of Methyl Blue onto Magnetic Mg_xCo_yZn_(1-x-y)Fe₂O₄ Nanoparticles