Properties and adsorption mechanism of magnetic biochar modified with molybdenum disulfide for cadmium in aqueous solution

Khan, Zulqarnain Haider; Gao, Minling; Qiu, Weiwen; Song, Zhengguo

doi:10.1016/j.chemosphere.2020.126995

Cited by 107 publications

(46 citation statements)

References 74 publications

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“…The adsorption capacity of biochar maintained stable and had no obvious difference with the initial pH from 6 to 8. These results are in line with previous studies [24,39]. Figure 5 demonstrates the low Cd 2+ adsorption onto biochar at low solution pH.…”

Section: Effect Of Solution Ph On CD 2+ Adsorptionsupporting

confidence: 92%

“…The Cd 2+ adsorbed on these biochars all reached equilibrium within 7 h. The adsorption primarily occurred on the outer surfaces of biochar at quick adsorption stage; its adsorption mechanism was expected to be related to both chemical and physical adsorption. At the next stage, Cd 2+ entered into the pores of the biochar and combined with active sites, and the adsorption process was slow until it reached the equilibrium [39]. Compared with other biochars, the equilibrium amounts adsorbed by BC20 were higher (Figure 7).…”

Section: Adsorption Kineticsmentioning

confidence: 98%

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Characterization of Biochars Produced by Co-Pyrolysis of Hami Melon (Cantaloupes) Straw Mixed with Polypropylene and Their Adsorption Properties of Cadmium

Huang

Zhang

et al. 2021

IJERPH

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Reuse of waste from Hami melon (cantaloupes) straws (HS) mingled with polypropylene (PP) ropes is necessary and beneficial to mitigate environmental pollution. The objective of this study was to investigate the characteristics and mechanisms of Cd2+ adsorption on biochars produced by co-pyrolysis of HS-PP with various mixing ratios. N2-sorption, scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS), elemental analysis, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermal gravity, and differential thermal gravity (TG/DTG) were applied to evaluate the physicochemical properties of materials. Batch adsorption experiments were carried out for investigating the effects of initial pH, Cd2+ concentration, and adsorption time. It was found that the Langmuir and pseudo-second-order models fitted best for the experimental data, indicating the dominant adsorption of co-pyrolysis biochars is via monolayer adsorption. Biochar derived at 4/1 mixing ratio of HS/PP by weight percentage had the highest adsorption capacity of 108.91 mg·g−1. Based on adsorption isotherm and kinetic analysis in combined with EDS, FTIR, and XRD analysis, it was concluded that the main adsorption mechanism of co-pyrolysis biochar involved the surface adsorption, cation exchange, complexation of Cd2+ with surface functional groups, and chemical precipitation. This study also demonstrates that agricultural wastes to biochar is a sustainable way to circular economy.

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Section: Effect Of Solution Ph On CD 2+ Adsorptionsupporting

confidence: 92%

Section: Adsorption Kineticsmentioning

confidence: 98%

Characterization of Biochars Produced by Co-Pyrolysis of Hami Melon (Cantaloupes) Straw Mixed with Polypropylene and Their Adsorption Properties of Cadmium

Huang

Zhang

et al. 2021

IJERPH

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“…In this study, magnetic biochar modified with molybdenum disulfide was used as the adsorbent. According to the obtained results, increasing the amount of adsorbent lead to an increase in the amount of cadmium adsorption on the adsorbent 37 . In another study, Asfaram et al (2017) utilized Mn@CuS/ZnS-NC-AC as an adsorbent to remove methylene blue (MB) and malachite green (MG) dyes.…”

Section: Resultsmentioning

confidence: 76%

Experimental modelling studies on the removal of dyes and heavy metal ions using ZnFe2O4 nanoparticles

Zhao

Baharinikoo

Farahani

et al. 2022

Sci Rep

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The presence of dyes and heavy metals in water sources as pollutants is harmful to human and animal health. Therefore, this study aimed to evaluate the efficacy of zinc ferrite (ZnFe2O4) nanoparticles (ZF-NPs) due to their outstanding properties including cost-effectiveness, availability, and applicability for removal of auramine O (AO), methylene blue (MB), and Cd (II). The effect of the main operating parameters such as AO concentration, MB concentration, Cd (II) concentration, adsorbent amount, solution pH, and sonication time was optimized by the response surface methodology (RSM). Optimal conditions were obtained at adsorbent amount of 0.25 g, pH = 6, sonication time of 15 min, and concentration of 15 mg L−1, and more than 91.56% were removed from all three analytes. The adsorption of AO, MB, and Cd (II) onto ZF-NPs followed pseudo-second-order kinetics and the equilibrium data fitted well with Langmuir isotherm. The maximum adsorption capacities of ZF-NPs for AO, MB and Cd (II) were as high as 201.29 mg g−1, 256.76 mg g−1 and 152.48 mg g−1, respectively. Also, the reuse of the adsorbent was investigated, and it was found that the adsorbent can be used for up to five cycles. Based on the results of interference studies, it was found that different ions do not have a significant effect on the removal of AO, MB, and Cd (II) in optimal conditions. The ZF-NPs was investigated successfully to remove AO, MB, and Cd (II) from environmental water samples. The results of this study showed that ZF-NPs can be used as a suitable adsorbent to remove AO, MB, and Cd (II) from aqueous solution.

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“…The most feasible uses of water hyacinth include production of biogas (Gupta et al 2012;Gaurav et al, 2020), bio-sorbent for pollution treatment, animal fodder, wastewater treatment (Kamna, 2013); and also, application in agriculture through converting into biochar (Ahmed et al 2018). In the developing countries, there has been an emphasis on converting these aquatic weeds into useful resources, including animal feed, compost or for biochar production via pyrolysis process (Abdel Shafy et al, 2016;Allam et al, 2020;Khan et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Assessment of Water Hyacinth Biochar as a Soil Amendment for Sandy Soils

El-Azeim

Salah

Hammam

2021

Journal of Soil Sciences and Agricultural Engineering

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Soil application of water hyacinth biochar as a source of nutrient-and carbon-rich biomass may be an effective ploy to eradicate this invasive aquatic weed. Incubation trial was conducted to assess effects of water hyacinth biochar addition on some sandy soil biochemical and biological properties and potential carbon sequestration at different application rates and methods. Results demonstrated that pyrolysis of water hyacinth at temperature of 300 °C and 30 min furnace residence time produced biochar with coveted physicochemical properties. Field emission scanning electronic microscopy (FE-SEM) images obtained for water hyacinth biochar showed major macroscopic changes caused by substantial changes in pore structure, surface area and surface morphology due to insufficient carbonization. Soil biochemical and microbiological characteristics after incubation exposed obvious significant improvements at all rates compared to control and varied markedly between addition of biochar as incorporation and broadcasting. Among different treatments, biochar addition as incorporation at the rate of 3% resulted in higher significant increases in most tested soil parameters. Water hyacinth biochar provided nitrogen and carbon immediately via SOC, DOC and DON in treated sandy soils providing energy for microbial biomass compared to control and this reflected by increases in soil values of C-MIC N-MIC and P-MIC. In addition, water hyacinth biocharring would greatly improve sandy soil carbon sequestration at high application rates. It could be concluded that water hyacinth transformation into biochar represents a sustainable strategy for managing these weeds and thus become a valuable organic source for sandy soils and will boost carbon sequestration.

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Properties and adsorption mechanism of magnetic biochar modified with molybdenum disulfide for cadmium in aqueous solution

Cited by 107 publications

References 74 publications

Characterization of Biochars Produced by Co-Pyrolysis of Hami Melon (Cantaloupes) Straw Mixed with Polypropylene and Their Adsorption Properties of Cadmium

Characterization of Biochars Produced by Co-Pyrolysis of Hami Melon (Cantaloupes) Straw Mixed with Polypropylene and Their Adsorption Properties of Cadmium

Experimental modelling studies on the removal of dyes and heavy metal ions using ZnFe2O4 nanoparticles

Assessment of Water Hyacinth Biochar as a Soil Amendment for Sandy Soils

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