Efficient cadmium removal from aqueous solutions using a sample coal waste activated by rhamnolipid biosurfactant

Shami, Rahim Boveiri; Shojaei, Vahideh; Khoshdast, Hamid

doi:10.1016/j.jenvman.2018.03.126

Cited by 31 publications

(8 citation statements)

References 46 publications

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“…In order to analyse the effect of operational parameters on process responses, firstly, it is necessary to develop a parametric model that can accurately forecast the intended response in the operating area, i.e., inside the low to high intended range for parameters (Boveiri et al, 2019). For modelling experimental data, the Design Expert v.7.0 software (Demo version 7.0.0, from Stat-Ease Inc., Minneapolis, MN, USA) was used.…”

Section: Statistical Analysis Of Resultsmentioning

confidence: 99%

Effect of an acetonized pyrolysis oil recycled from spent-car tires on coal flotation performance

Hassanzadeh¹

2023

Physicochem. Probl. Miner. Process.

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In this paper, an extended Historical Data (HD) design was applied for evaluating the effect of an acetonized pyrolysis oil (PO) produced by pyrolysis of spent-car tires in coal. Experimental and statistical analyses were applied for examining the influence of some operating variables such as concentration of diesel oil (0, 10, and 20 L/t), pine oil (0.55, 0.1, and 1 L/t), and the pyrolysis oil (0, 10, and 20 L/t) as well as solid content of pulp (5, 10, and 15% (w/w)) on the yield and ash content of final concentrate. Fourier Transform Infrared Spectroscopy (FTIR) measurements showed that PO contained hydroxyl, aldehyde, aliphatic, and aromatic compounds. Based on the results of Analysis of Variance (ANOVA), the main effect of all variables, except concentration of pine oil, on the flotation responses were found significant. Batch flotation experimental results indicated that using pyrolysis oil resulted in a 2% increase in ash content and a 35% decrease of the yield, through a nonlinear trend. The curved behavior of flotation measures was due to the possible competitive adsorption between PO and diesel oil and nonselective interaction between pyrolysis oil and other reagents. The negative effect of PO on coal flotation efficiency was also ascribed to the interaction between hydrophilic groups in PO structure and the oxide nature of non-combustible materials of coal particles.

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Section: Statistical Analysis Of Resultsmentioning

confidence: 99%

Effect of an acetonized pyrolysis oil recycled from spent-car tires on coal flotation performance

Hassanzadeh¹

2023

Physicochem. Probl. Miner. Process.

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“…Based on the obtained values of q max and k f , our tobaccobased AC is superior (in terms of Cd 2+ uptake) to grape stem biosorbent [56], AC from Ulva Lactuca [74], AC from oak wood [94], carbon activated with rhamnolipid biosurfactant [95], having a similar capacity than the composite AC (carbon/zirconium oxide) [96] (Table 6). The order for the best adjustments found using nonlinear models in the adsorption of Cd 2+ by CT in natura + CO 2 was: Freundlich > D-R > Langmuir > Sips > Liu > Temkin; for nonlinear models applied on CT NaOH + CO 2 : Langmuir > D-R > Temkin > Liu > Sips > Freundlich.…”

Section: Adsorption Equilibrium Studies and Comparison Between Linear And Non-linear Forms Of Isothermsmentioning

confidence: 91%

Effective Cd2+ removal from water using novel micro-mesoporous activated carbons obtained from tobacco: CCD approach, optimization, kinetic, and isotherm studies

Manfrin

Gonçalves

Schwantes

et al. 2021

J Environ Health Sci Engineer

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Purpose This research aimed to develop activated carbons from tobacco by double (thermal-physical) and triple activations (thermal-chemical-physical) for high-efficiency removal of Cd 2+ . Methods The adsorbents were characterized by their chemical composition, point of zero charge (pH PZC ), SEM, FT-IR, BET, and BJH. The subsequent adsorption studies were conducted: optimal conditions (CCD on adsorbent dose versus pH of Cd 2+ solution), kinetics, equilibrium, thermodynamics, and desorption studies. ResultsThe activated carbons have irregular and heterogeneous morphology, surface functional groups COO-, C-O, C-O-C, C=O and O-H, pH PZC of 11.11 and 10.86, and enhanced SSA (especially for CT NaOH + CO 2 = 103.40 g m −2 ). The optimal conditions for Cd 2+ adsorption occur using 4.0 g L −1 , pH from 3.0 to 7.0, with most of the Cd 2+ adsorbed in the first 10-20 min. The goodness of the fit found for pseudo-first order, pseudo-second order, intraparticle diffusion, Langmuir, Freundlich, Dubinin-Radushkevich, Sips, and Temkin suggest the occurrence of Cd 2+ chemisorption and physisorption in mono and multilayers. The values of ∆G° < 0 kJ mol −1 indicate that the observed phenomena are energetically favorable and spontaneous; the values of ∆H° < 0 and the effective desorption rates (58.52% and 44.64%) suggest that the adsorption of Cd 2+ is ruled mainly (but not only) by physical interactions. Conclusion Our excellent results on Cd 2+ removal allow us to state that tobacco use as a raw material for adsorbent development is a renewable and eco-friendly technique, allowing the production of highly effective activated carbons and providing an adequate destination for this waste. KeywordsAlternative adsorbents • Cadmium removal • CCD approach • Advanced water treatment • Nicotiana tabacum • Cigarettes * Daniel Schwantes

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“…The first step in analysing the impact of operational variables on the process responses is developing a parametric model that can accurately predict the desired response in the operating space, i.e., within the low to high levels intended for the variables [37]. In the second step, after developing the initial model by the software, abnormal data were identified by examining the model parameters and the model was optimized by the user to achieve the best fitting results.…”

Section: Statistical Analysis Of Optimization Doementioning

confidence: 99%

Hybrid Serving of DOE and RNN-Based Methods to Optimize and Simulate a Copper Flotation Circuit

Gholami

Movahedifar

Khoshdast³

et al. 2022

Minerals

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Prediction of metallurgical responses during the flotation process is extremely vital to increase the process efficiency using a proper modeling approach. In this study, two new variants of the recurrent neural network (RNN) method were used to predict the copper ore flotation indices, i.e., grade and recovery within different operating conditions. The model input parameters including pulp pH and solid content as well as frother and collector dosages were first analysed and then optimized using a two-step factorial approach. The statistical analysis showed a reliable correlation between operating parameters and copper grade and recovery with coefficients of 99.86% and 94.50%, respectively. The main effect plots indicated that pulp pH and solid content positively affect copper grade while increasing the frother and collector dosages negatively influenced the quality of the final concentrate. Despite the same effect from pulp pH, reverse effects from other variables were observed for copper recovery. Process optimization revealed that maximum copper recovery of 44.39% with a grade of 11.48% could be achieved under the optimal condition as pulp pH of 10, solid content of 20%, and frother and collector concentrations of 25 g/t and 9.9 g/t, respectively. Then, the predictive efficiency of long short-term memory (LSTM) and gated recurrent unit (GRU) networks with proper structure were evaluated using mean square error (MSE), root mean square error (RMSE), mean absolute percentage error (MAPE), and correlation coefficient (R2). The simulation results showed that the LSTM network with higher R2 of 0.963 and 0.934 for copper grade and recovery, respectively, was more effective than the GRU algorithm with the corresponding values of 0.956 and 0.919, respectively. The results show that the LSTM model could be useful in predicting the copper flotation behaviour in response to changes in the operating parameters.

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Efficient cadmium removal from aqueous solutions using a sample coal waste activated by rhamnolipid biosurfactant

Cited by 31 publications

References 46 publications

Effect of an acetonized pyrolysis oil recycled from spent-car tires on coal flotation performance

Effect of an acetonized pyrolysis oil recycled from spent-car tires on coal flotation performance

Effective Cd2+ removal from water using novel micro-mesoporous activated carbons obtained from tobacco: CCD approach, optimization, kinetic, and isotherm studies

Hybrid Serving of DOE and RNN-Based Methods to Optimize and Simulate a Copper Flotation Circuit

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