Isotherm models for adsorption of heavy metals from water - A review

Chen, Xinyu; Hossain, Md Faysal; Duan, Chengyu; Lu, Jian; Tsang, Yiu Fai; Islam, Md Shoffikul; Zhou, Yanbo

doi:10.1016/j.chemosphere.2022.135545

Cited by 277 publications

(104 citation statements)

References 126 publications

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“… 22 Additionally, the application of the Langmuir model needs to follow several assumptions, namely (i) the adsorbent surface is uniform, (ii) only monolayer adsorption occurs, and (iii) there is no force between the adsorbed molecules. 23 P : experimental pressure, MPa; V L and P L : Langmuir volume and Langmuir pressure, cm 3 g −1 and MPa.…”

Section: Samples Experiments and Methodsmentioning

confidence: 99%

Adsorption behavior and mechanism of CO₂in the Longmaxi shale gas reservoir

et al. 2022

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Section: Samples Experiments and Methodsmentioning

confidence: 99%

Adsorption behavior and mechanism of CO₂in the Longmaxi shale gas reservoir

et al. 2022

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“…However, the Langmuir and Freundlich models are the most widely used. While the first one describes chemisorption, the Freundlich model describes physisorption [ 75 ].…”

Section: Mechanismmentioning

confidence: 99%

“…Generally, the kinetic models described for fluoride adsorption can be classified into reaction-based and diffusion-based models. As with isotherm models, there is a wide variety of models involving different considerations [ 43 , 51 , 75 , 77 , 81 , 82 , 83 ]. Usually, the pseudo-first- and second-order models are applied in addition to the intra-particle diffusion model [ 77 , 84 ].…”

Section: Mechanismmentioning

confidence: 99%

Lignocellulosic Biomass as Sorbent for Fluoride Removal in Drinking Water

et al. 2022

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Water supply to millions of people worldwide is of alarmingly poor quality. Supply sources are depleting, whereas demand is increasing. Health problems associated with water consumption exceeding 1.5 mg/L of fluoride are a severe concern for the World Health Organization (WHO). Therefore, it is urgent to research and develop new technologies and innovative materials to achieve partial fluoride reduction in water intended for human consumption. The new alternative technologies must be environmentally friendly and be able to remove fluoride at the lowest possible costs. So, the use of waste from lignocellulosic biomasses provides a promising alternative to commercially inorganic-based adsorbents—published studies present bioadsorbent materials competing with conventional inorganic-based adsorbents satisfactorily. However, it is still necessary to improve the modification methods to enhance the adsorption capacity and selectivity, as well as the reuse cycles of these bioadsorbents.

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“…10 used for nding the maximum adsorption capacity of adsorbent (Boparai et al, 2011). q e= q max.bC e 1+bCe q e=K F C 1/n e q ms (mg/g) shows maximum adsorption capacity, sip isotherm constant K s (L/mg) and exponent of sip model also called a heterogeneity factor (Chen et al, 2022).…”

Section: Langmuir Isotherm Modelmentioning

confidence: 99%

The impact of tungsten oxide (WO3) nanoparticles, embedded in Guar gum based hydrogel for water treatment applications

Ahmad

Hassan

Ahmed

et al. 2022

Preprint

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In this research work, a novel guar gum based membrane was fabricated that was further reinforced with tungsten oxide (WO3) nanoparticles (NPs) respectively for the removal of methyl violet (MV) dye from aqueous solution. The membranes were characterized by Fourier Transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) which confirms the presence of functional groups, rough and smooth surface morphology with porous structure and X-ray diffraction (XRD) shows specific peaks approves the NPs of WO3 respectively. The swelling study of membranes was performed by using various parameters i.e. maximum swelling were attained at neutral pH 7, water transport mechanism was followed the Fickain diffusion and the gel content was linearly increased 91–95%. The adsorption efficiency of membrane for virulent dye (MV) was investigated by following parameters i.e. the adsorption of dye was maximum at pH 10 and 96% of dye was removed at 60 mins. The kinetic data for adsorption process was best fitted with pseudo first order kinetic model which shows the physisorption of dye and isothermal data for Langmuir-Freundlich model shows multilayer adsorption. The negative ∆H values indicates the exothermic reaction. Furthermore, pre and post analysis of water samples (drinking tap water and contaminated water) were used to examine the physiochemical parameters such as colour, odour, pH, conductivity, TDS and DO (dissolve oxygen) by using the synthesized membrane. The fast uptake capacity of dye removal and the physicochemical parameters of contaminated water was observed by friendly nature of membrane.

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Isotherm models for adsorption of heavy metals from water - A review

Cited by 277 publications

References 126 publications

Adsorption behavior and mechanism of CO₂in the Longmaxi shale gas reservoir

Adsorption behavior and mechanism of CO₂in the Longmaxi shale gas reservoir

Lignocellulosic Biomass as Sorbent for Fluoride Removal in Drinking Water

The impact of tungsten oxide (WO3) nanoparticles, embedded in Guar gum based hydrogel for water treatment applications

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Isotherm models for adsorption of heavy metals from water - A review

Cited by 277 publications

References 126 publications

Adsorption behavior and mechanism of CO2in the Longmaxi shale gas reservoir

Adsorption behavior and mechanism of CO2in the Longmaxi shale gas reservoir

Lignocellulosic Biomass as Sorbent for Fluoride Removal in Drinking Water

The impact of tungsten oxide (WO3) nanoparticles, embedded in Guar gum based hydrogel for water treatment applications

Contact Info

Product

Resources

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Adsorption behavior and mechanism of CO₂in the Longmaxi shale gas reservoir

Adsorption behavior and mechanism of CO₂in the Longmaxi shale gas reservoir