Rapid removal of Hg (II) from aqueous solution by rice straw activated carbon prepared by microwave-assisted H2SO4 activation: Kinetic, isotherm and thermodynamic studies

Mashhadi, Somaye; Sohrabi, Razieh; Javadian, Hamedreza; Ghasemi, Maryam; Tyagi, Inderjeet; Agarwal, Shilpi; Gupta, Vinod Kumar

doi:10.1016/j.molliq.2015.12.040

Cited by 61 publications

(15 citation statements)

References 84 publications

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“…The percentage adsorption increased on moving from pH 5.0 to 6.0 and decreased on further increase in pH. The literature reveals that activation of the adsorbent by treatment with H 2 SO 4 increases cationic exchange sites at the surface [43]. At acidic pH, the dye molecule behaves as a cation due to protonation of the NH 2 group.…”

Section: Effect Of Ph On Rbbr Dye Removalmentioning

confidence: 97%

Adsorptive removal of Remazol Brilliant Blue R dye from its aqueous solution by activated charcoal of Thuja orientalis leaves: an eco-friendly approach

et al. 2020

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Anthraquinone dyes are one of the major water pollutants due to their stability and persistence in the aquatic system. The present study describes the use of activated charcoal prepared from Thuja orientalis leaves (ACTOL) as an adsorbent to remove reactive anthraquinone dye Remazol Brilliant Blue R (RBBR) from its aqueous solution. In this work, leaves of the plant were carbonated to get fine charcoal which was activated by acid treatment and analysed by BET, SEM and FTIR techniques. Batch experiments were conducted to study the effect of pH, contact time, concentration and amount of adsorbent on the removal of RBBR in the concentration range 0.1-6.65 m mol L −1 . The highest efficiency was found to be 81% at pH 6 and contact time of 300 min. Adsorption data were analysed by Langmuir, Freundlich and Temkin isotherm models. The adsorption was found to follow Freundlich adsorption isotherm (R 2 = 0.9972). The kinetic study of the process was done by analysing the time adsorption data with pseudo-first-order, pseudo-second-order and intraparticle diffusion models, and it was found to obey pseudo-second-order kinetics. The adsorbent showed 73% of efficiency even after four regeneration cycles. FTIR analysis revealed that the various groups present at the surface of adsorbent were responsible for uptake of dye molecules. This study reveals that leaves of Thuja orientalis, a common biowaste, can be used as an efficient adsorbent for the removal of RBBR dye from its aqueous solution. It provides an economical and eco-friendly way to mitigate the waste and use it as an adsorbent.

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Section: Effect Of Ph On Rbbr Dye Removalmentioning

confidence: 97%

Adsorptive removal of Remazol Brilliant Blue R dye from its aqueous solution by activated charcoal of Thuja orientalis leaves: an eco-friendly approach

et al. 2020

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“…Consequently, the adsorption of As (V) onto MPP-AC was not fitted to first order kinetic model. The pseudo-second order (2 nd ) kinetics model recommends that the adsorbent surface activated sites and the number of adsorbate in the solution simultaneously determine the kinetics (Mashhadi et al, 2016). Linearized mathematical model of pseudo second order kinetic is expressed as the following:…”

Section: Kinetic Study Of Adsorptionmentioning

confidence: 99%

Optimization of Arsenic Adsorption onto Cativated Carbon Dreived from Potato Peel Using Response Surfase Methodology

Haji

Mohammed

2019

SJUOZ

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The present study was designed to optimizing the adsorption of As (V) onto potato peel derived activated carbon (MPP-AC) by employing response surface method and central composite design. Adsorbent of cheap and locally available potato residue was produced based on chemical activation with H3PO4 subsequently carbonization to produce the porous activated carbon. The individual and interactive effects of five variables including initial arsenic concentration, temperature, time, dosage amount and pH of the medium were investigated. Based on the statistic analysis (ANOVA), the quadratic model was developed associating the adsorption capacity (qe). The optimum conditions were obtained of 9.98 mg L-1 of initial As (V) concentration, 28 °C of temperature, 39.7 min of time, 0.97 g of adsorbent dose and 7.3 of pH. The maximum adsorption capacity was 0.27 mg g-1 and 76.5% removal efficiency. The equilibrium isotherms and kinetic studies for estimating the mechanism of process demonstrated a good fit to Langmuir model and the pseudo-second order, respectively. The results of this study showed that the feasibility of central composite design for control adsorption process and indicated the use of activated carbon of potato residue have important implications for As (V) removal.

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“…The physical activation is to oxidize precursor using oxidizing gases such as O 2 [23], CO 2 [24] and H 2 O [25]. The chemical activation is to treat the precursor using chemical reagents such as H 3 PO 4 [26], H 2 SO 4 [27], KOH [28], ZnCl 2 [29], and K 2 CO 3 [30]. Both physical and chemical activation methods usually need high temperature (400°C-1000°C) to oxidize or etch the precursor to form multi-porous structure.…”

Section: Introductionmentioning

confidence: 99%

Biosorbents prepared from pomelo peel by hydrothermal technique and its adsorption properties for congo red

Zheng

Sun

et al. 2020

Mater. Res. Express

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A new kind of biosorbent was prepared from pomelo peel by using potassium hydroxide as activating agent and hydrothermal treatment method. The characteristics of materials were analyzed by SEM, BET and FTIR. Increasing the adsorbent dosage (from 2.5 to 17.5 g l −1 ) and contents of congo red in solution (from 20 to 50 mg l −1 ) cause the increment of removal rate of congo red. On the other side, the removal rate is decrement with rising of temperature and pH. The maximum adsorption quantity of biosorbent was 144.93 mg g −1 at 303 K, which calculated by Langmuir model. The pseudo-firstorder kinetic model, pseudo-second-order kinetic model and intra-particle diffusion model were used to explain adsorption process. The value of Gibbs free energy (ΔG) is −7.63 (kJ/mol) at 303 K and the enthalpy change (ΔH) is −31.43 (kJ/mol), meaning that adsorption behavior for congo red is spontaneous.

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Rapid removal of Hg (II) from aqueous solution by rice straw activated carbon prepared by microwave-assisted H2SO4 activation: Kinetic, isotherm and thermodynamic studies

Cited by 61 publications

References 84 publications

Adsorptive removal of Remazol Brilliant Blue R dye from its aqueous solution by activated charcoal of Thuja orientalis leaves: an eco-friendly approach

Adsorptive removal of Remazol Brilliant Blue R dye from its aqueous solution by activated charcoal of Thuja orientalis leaves: an eco-friendly approach

Optimization of Arsenic Adsorption onto Cativated Carbon Dreived from Potato Peel Using Response Surfase Methodology

Biosorbents prepared from pomelo peel by hydrothermal technique and its adsorption properties for congo red

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