Synthesis of Manganese Chloride Activated Carbon Deriving from Wheat Straw and its Adsorption Mechanism for Arsenic and Chromium

Zhu, Ningyuan; Yan, Tingmei; Qiao, Jun; Cao, Honglei

doi:10.4172/2380-2391.1000172

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…The band at 1384 cm −1 is for the C−H bending of CH 3 groups, while the band at 1045 cm −1 corresponds to C−O for alcohols and phenols and that at 874 cm −1 confirmed the C−C aromatic bending. 44 For the new derivative GHB, the IR spectrum (Figure 3d) showed a band at 3664 corresponding to the overlapping of O−H stretching of the O−H group of GG, N−H stretching of the amide group, and −SO 3 H stretching of the grafted AMPS. The band at 3435 cm −1 is from the hydroxyl group stretching in biochar.…”

Section: Resultsmentioning

confidence: 99%

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Guar Gum-Based Hydrogels as Potent Green Polymers for Enhanced Oil Recovery in High-Salinity Reservoirs

et al. 2021

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Improving oil production for high-salinity reservoirs using polymer flooding is challenging due to chemical and mechanical degradations. This study developed two biodegradable biopolymers based on graft copolymerization of guar gum (GG) with two different co-monomers, which are acrylamide (Am) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS), and cross-linked by N,N ′-methylene bisacrylamide (MBA) to face these challenges. The newly synthesized guar gum-based hydrogels, GG- g -poly(Am-AMPS) (GH) and GG- g -poly(Am-AMPS)/Biochar (GBH composite), were evaluated as potential candidates for enhanced oil recovery (EOR) under high-salinity conditions. Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) of the synthesized hydrogels were investigated, and their rheological properties were measured at room temperature. Both GH and GHB display a shear-thinning performance. In polymer flooding experiments, guar gum hydrogel (GH) and guar gum/biochar composite hydrogel (GHB) showed a remarkable influence on delaying the water breakthrough and proved to be effective biopolymers for enhanced oil recovery in high-salinity reservoirs. At the optimum concentration of 5 g/L, GH flooding achieved maximum oil recoveries of 70.53 and 72.11% in secondary and tertiary recovery processes, respectively. Meanwhile, the waterflooding process achieved an ultimate oil recovery of 58.42%. GHB flooding at optimum concentration, 2 g/L, increased the amount of oil recovery by 8.95% in tertiary recovery compared to waterflooding. Furthermore, GH (5 g/L) and GHB (2 g/L) slightly enhanced the rock water wettability as confirmed by contact angle measurements for GH and the relative permeability saturation curves for GH and GHB.

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Section: Resultsmentioning

confidence: 99%

“…The peaks at 1318 and 1411 cm –1 correspond to S=O stretching of the sulfonate group. 43 , 44 For the biochar IR spectrum ( Figure 3 c), the band at 3428 cm –1 is for the −OH group stretching of alcohols and phenols. The band at 1634 cm –1 is attributed to C=O corresponding to acid, aldehyde, and ketone contents.…”

Section: Resultsmentioning

confidence: 99%

Guar Gum-Based Hydrogels as Potent Green Polymers for Enhanced Oil Recovery in High-Salinity Reservoirs

et al. 2021

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“…Thus the adsorption of As(III) ions using BCF adsorbent probably took place via release of such hydroxyl groups from the coordinated complexes [57]. While, As(III) adsorption using BCM adsorbent might took place via oxidation (As(III) to As(V)) or ligand exchange (hydroxyl ions) reaction between Mn and arsenite [58]. However, the exact structure of Mn-As species and its removal mechanism needs to be further investigated due to limited literature results.…”

Section: Proposed As(iii) Removal Mechanismmentioning

confidence: 99%

Batch and continuous reactor studies for the adsorption of As(III) from wastewater using a hybrid biochar loaded with transition metal oxides: Kinetics and mass transfer analysis

Gupta

Giri

Rene

et al. 2020

Environmental Engineering Research

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As(III) presence in low concentration (1-5 mg/L) in water presents a challenging problem in its removal. In the present study, biochar prepared by pyrolysis of mustard cake and loaded with Fe-Mn binary oxides through hydrothermal technique was used for adsorptive removal of As(III) from water in batch and continuous mode. The synthesised biochar exhibited mesoporous structures in the range of 2-50 nm (based on BET analysis). The maximum adsorption capacity (95.7 mg/g) obtained using biochar loaded with both Fe-Mn oxides was found to be 1.4 times higher than that of pristine biochar. The adsorption equilibria was best described by Freundlich isotherm (based on R 2 and χ 2) suggesting that the As(III) adsorption was multilayered. The external mass transfer coefficients (β L = 10-5 cm 2 /s) were observed to be higher than film (D f = 10-7-10-9 cm 2 /s) and intraparticle (D i = 10-9 cm 2 /s) diffusivities in batch mode. In column studies, Thomas model gave the best correlation coefficient (R 2 > 0.95) and the adsorption was limited by external mass transfer. Kinetic rate constant decreased with increase in initial As(III) concentration and flow rate. The oxide loaded biochar exhibited reusability up to three times for As(III) removal.

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“…H3PO4 activation is a common method for the preparation of activated carbon due to its low energy consumption, low pollution, and high yield (Arvelakis et al 2010). The raw material is usually mixed with different H3PO4 concentrations ranging from 30% to 60% in a certain impregnation ratio of 0.5 to 2.5, and then activated at higher temperatures (Cui et al 2015;Ghosh et al 2016;Zhu et al 2016). As the temperature rises, phosphoric acid depolymerizes the organic polymers (cellulose, hemicellulose, and lignin) of the raw material into small fragments, which form pores after washing.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the physical and chemical properties of activated carbons based on hulless barley straw and plain wheat straw obtained by H3PO4 activation

Wang

et al. 2018

BioRes

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High specific surface area activated carbon was prepared by improving the process conditions of phosphoric acid activation and hulless barley straw and plain wheat straw as raw materials. The effects of the activation time on the pore structure and specific surface area of two types of activated carbon were investigated. The results revealed that soaking straws in the high concentrations of H3PO4 for 0.5 h to ensure complete soaking and then removing the straws from H3PO4 solution to activate was beneficial to the infiltration of H3PO4 in the raw material, and there was an increase in the surface area of activated carbon. The largest specific surface area of activated carbon prepared from plain wheat straw and hulless barley straw was 1524 m2/g and 1885 m2/g, respectively. Thermogravimetric analysis and scanning electron microscopy showed that the higher cellulose content, higher hemicellulose content, and smaller fiber morphology in hulless barley straw compared with wheat straw were the main reasons for the more abundant pore structure and higher specific surface area of the activated carbon.

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Synthesis of Manganese Chloride Activated Carbon Deriving from Wheat Straw and its Adsorption Mechanism for Arsenic and Chromium

Cited by 5 publications

References 31 publications

Guar Gum-Based Hydrogels as Potent Green Polymers for Enhanced Oil Recovery in High-Salinity Reservoirs

Guar Gum-Based Hydrogels as Potent Green Polymers for Enhanced Oil Recovery in High-Salinity Reservoirs

Batch and continuous reactor studies for the adsorption of As(III) from wastewater using a hybrid biochar loaded with transition metal oxides: Kinetics and mass transfer analysis

Analysis of the physical and chemical properties of activated carbons based on hulless barley straw and plain wheat straw obtained by H3PO4 activation

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