Synthesis, characterization and application of novel MnO and CuO impregnated biochar composites to sequester arsenic (As) from water: Modeling, thermodynamics and reusability

Imran, Muhammad; Iqbal, Majid; Iqbal, Jibran; Shah, Noor S.; Khan, Zia Ul Haq; Murtaza, Behzad; Amjad, Muhammad; Ali, Shafaqat; Rizwan, Muhammad

doi:10.1016/j.jhazmat.2020.123338

Cited by 130 publications

(43 citation statements)

References 80 publications

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“…which is also evident from the FTIR spectrum. The presence of negative charges on particle surfaces favors the selectivity and sequestration of cationic contaminants [ 41 ]. Similar results were obtained by Agarwal et al [ 42 ] using tomato leaf extract and Nithya and Kalyanasundharam [ 43 ] using Cardiospermum halicacabum leaf extracts for the biosynthesis of ZnO particles.…”

Section: Resultsmentioning

confidence: 99%

Biofabrication of ZnO nanoparticles using Acacia arabica leaf extract and their antibiofilm and antioxidant potential against foodborne pathogens

et al. 2022

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Emergence of multidrug resistant pathogens is increasing globally at an alarming rate with a need to discover novel and effective methods to cope infections due to these pathogens. Green nanoparticles have gained attention to be used as efficient therapeutic agents because of their safety and reliability. In the present study, we prepared zinc oxide nanoparticles (ZnO NPs) from aqueous leaf extract of Acacia arabica. The nanoparticles produced were characterized through UV-Visible spectroscopy, scanning electron microscopy, and X-ray diffraction. In vitro antibacterial susceptibility testing against foodborne pathogens was done by agar well diffusion, growth kinetics and broth microdilution assays. Effect of ZnO NPs on biofilm formation (both qualitatively and quantitatively) and exopolysaccharide (EPS) production was also determined. Antioxidant potential of green synthesized nanoparticles was detected by DPPH radical scavenging assay. The cytotoxicity studies of nanoparticles were also performed against HeLa cell lines. The results revealed that diameter of zones of inhibition against foodborne pathogens was found to be 16–30 nm, whereas the values of MIC and MBC ranged between 31.25–62.5 μg/ml. Growth kinetics revealed nanoparticles bactericidal potential after 3 hours incubation at 2 × MIC for E. coli while for S. aureus and S. enterica reached after 2 hours of incubation at 2 × MIC, 4 × MIC, and 8 × MIC. 32.5–71.0% inhibition was observed for biofilm formation. Almost 50.6–65.1% (wet weight) and 44.6–57.8% (dry weight) of EPS production was decreased after treatment with sub-inhibitory concentrations of nanoparticles. Radical scavenging potential of nanoparticles increased in a dose dependent manner and value ranged from 19.25 to 73.15%. Whereas cytotoxicity studies revealed non-toxic nature of nanoparticles at the concentrations tested. The present study suggests that green synthesized ZnO NPs can substitute chemical drugs against antibiotic resistant foodborne pathogens.

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Section: Resultsmentioning

confidence: 99%

Biofabrication of ZnO nanoparticles using Acacia arabica leaf extract and their antibiofilm and antioxidant potential against foodborne pathogens

et al. 2022

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“…The negative ΔG values indicate that the adsorption process is spontaneous at 4–40 °C ( Tables 3 and S5 ). 35 The mobility of As V ions increases with increasing solution temperature; therefore, elevated As V removal capacity was achieved by the BC composites. 102 The obtained Δ H values were positive, which demonstrated that the As V adsorption process was endothermic for all BCs.…”

Section: Results and Discussionmentioning

confidence: 97%

Adsorption–Desorption Behavior of Arsenate Using Single and Binary Iron-Modified Biochars: Thermodynamics and Redox Transformation

et al. 2022

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Arsenic (As) is a dangerous contaminant in drinking water which displays cogent health risks to humans. Effective clean-up approaches must be developed. However, the knowledge of adsorption–desorption behavior of As on modified biochars is limited. In this study, the adsorption–desorption behavior of arsenate (As V ) by single iron (Fe) and binary zirconium–iron (Zr–Fe)-modified biosolid biochars (BSBC) was investigated. For this purpose, BSBC was modified using Fe-chips (FeBSBC), Fe-salt (FeCl 3 BSBC), and Zr–Fe-salt (Zr–FeCl 3 BSBC) to determine the adsorption–desorption behavior of As V using a range of techniques. X-ray photoelectron spectroscopy results revealed the partial reduction of pentavalent As V to the more toxic trivalent As III form by FeCl 3 BSBC and Zr–FeCl 3 BSBC, which was not observed with FeBSBC. The Langmuir maximum As V adsorption capacities were achieved as 27.4, 29.77, and 67.28 mg/g when treated with FeBSBC (at pH 5), FeCl 3 BSBC (at pH 5), and Zr–FeCl 3 BSBC (at pH 6), respectively, using 2 g/L biochar density and 22 ± 0.5 °C. Co-existing anions reduced the As V removal efficiency in the order PO 4 3– > CO 3 2– > SO 4 2– > Cl – > NO 3 – , although no significant inhibitory effects were observed with cations like Na + , K + , Mg 2+ , Ca 2+ , and Al 3+ . The positive correlation of As V adsorption capacity with temperature demonstrated that the endothermic process and the negative value of Gibbs free energy increased (−14.95 to −12.47 kJ/mol) with increasing temperature (277 to 313 K), indicating spontaneous reactions. Desorption and regeneration showed that recycled Fe-chips, Fe-salt, and Zr–Fe-salt-coated biochars can be utilized for the effective removal of As V up to six-repeated cycles.

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“…The equilibrium results of nickel adsorption on bentonite can be described using different adsorption isotherm models (Bhattacharyya & Gupta 2008;Ghomri et al 2013), pseudo-first and pseudo-second orders (Yagmur 2020), and Elovich and pseudo-second order equations (Iqbal et al 2019;Tang et al 2021). Other researchers' studies also showed that pseudo second-order kinetic model revealed better agreement with kinetic experimental data as matched with other kinetic models (Imran et al 2021). While the adsorption kinetics and isotherms of acid activated bentonites have not received much attention, this research has studied them.…”

Section: Introductionmentioning

confidence: 87%

Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites

Mehranjani

Hayati-Ashtiani

Rezaei

2021

Water Science and Technology

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In this research, natural bentonite and its acid-activated forms were employed as adsorbents for the adsorption of Ni2+ ions from wastewater. Natural bentonite was activated with 2M sulfuric acid, 4.5 h and 95 °C (the beast acid-activated sample with the highest adsorption capacity) and the other 6M sulfuric acid, 7.5 h and 95 °C (the worst acid-activated sample with the lowest adsorption capacity). The adsorption of Ni2+ was studied through experiments including equilibrium contact time and selectivity. The equilibrium time of contact for bentonite was obtained at 180 min. The Ni2+ separation process along with Zn2+ selectivity studies was considered through adsorption experiments. The results showed that there was a maximum amount of Ni2+ adsorption in the absence of Zn2+ for all samples. The results showed the best ﬁt is obtained with the pseudo-second-order kinetic model. Working out different bentonite types to determine the best kinetic models, we explored the Langmuir and Florry–Huggins models provided a good fit with experimental data for acid-activated bentonites and the best results from linear forms of the adsorption isotherm models for fitting the experimental data of natural bentonite are obtained Langmuir, Temkin and Freundlich models.

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Synthesis, characterization and application of novel MnO and CuO impregnated biochar composites to sequester arsenic (As) from water: Modeling, thermodynamics and reusability

Cited by 130 publications

References 80 publications

Biofabrication of ZnO nanoparticles using Acacia arabica leaf extract and their antibiofilm and antioxidant potential against foodborne pathogens

Biofabrication of ZnO nanoparticles using Acacia arabica leaf extract and their antibiofilm and antioxidant potential against foodborne pathogens

Adsorption–Desorption Behavior of Arsenate Using Single and Binary Iron-Modified Biochars: Thermodynamics and Redox Transformation

Isotherm and selectivity study of Ni(II) removal using natural and acid-activated nanobentonites

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