Environmental surface chemistries and adsorption behaviors of metal cations (Fe3+, Fe2+, Ca2+ and Zn2+) on manganese dioxide-modified green biochar

Maneechakr, Panya

doi:10.1039/c9ra03112j

Cited by 36 publications

(3 citation statements)

References 39 publications

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“…The saturated adsorption amounts (q m ) of Fe 3+ , Cu 2+ , and Cr 3+ ions were 324.7, 306.8, and 293.3 mg/g, respectively, according to the Langmuir linear fitting. Moreover, a comparison of the maximum adsorption capacities of Fe 3+ , Cu 2+ , and Cr 3+ ions onto other adsorbents is shown in Table 2 [47][48][49][50][51]. Except for the adsorption of Cu 2+ and Cr 3+ ions onto EDTA-inspired polydentate hydrogels, the adsorption capacities were significantly higher for the MSNPs-CAAQ sorbents used in this study.…”

Section: Adsorption Characteristicsmentioning

confidence: 80%

Network–Polymer–Modified Superparamagnetic Magnetic Silica Nanoparticles for the Adsorption and Regeneration of Heavy Metal Ions

Xu,

Li,

Ding

2023

Molecules

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Superparamagnetic magnetic nanoparticles (MNPs, Fe3O4) were first synthesized based on a chemical co–precipitation method, and the core–shell magnetic silica nanoparticles (MSNPs, Fe3O4@SiO2) were obtained via hydrolysis and the condensation of tetraethyl orthosilicate onto Fe3O4 seed using a sol–gel process. Following that, MSNPs were immobilized using a three–step grafting strategy, where 8-hloroacetyl–aminoquinoline (CAAQ) was employed as a metal ion affinity ligand for trapping specific heavy metal ions, and a macromolecular polymer (polyethylenimine (PEI)) was selected as a bridge between the surface hydroxyl group and CAAQ to fabricate a network of organic networks onto the MSNPs’ surface. The as–synthesized MSNPs–CAAQ nanocomposites possessed abundant active functional groups and thus contained excellent removal features for heavy metal ions. Specifically, the maximum adsorption capacities at room temperature and without adjusting pH were 324.7, 306.8, and 293.3 mg/g for Fe3+, Cu2+, and Cr3+ ions, respectively, according to Langmuir linear fitting. The adsorption–desorption experiment results indicated that Na2EDTA proved to be more suitable as a desorbing agent for Cr3+ desorption on the MSNPs–CAAQ surface than HCl and HNO3. MSNPs–CAAQ exhibited a satisfactory adsorption capacity toward Cr3+ ions even after six consecutive adsorption–desorption cycles; the adsorption efficiency for Cr3+ ions was still 88.8% with 0.1 mol/L Na2EDTA as the desorbing agent. Furthermore, the MSNPs–CAAQ nanosorbent displayed a strong magnetic response with a saturated magnetization of 24.0 emu/g, and they could be easily separated from the aqueous medium under the attraction of a magnet, which could facilitate the sustainable removal of Cr3+ ions in practical applications.

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Section: Adsorption Characteristicsmentioning

confidence: 80%

Network–Polymer–Modified Superparamagnetic Magnetic Silica Nanoparticles for the Adsorption and Regeneration of Heavy Metal Ions

Xu,

Li,

Ding

2023

Molecules

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“…Hydroxyl, carboxyl, and ester can be classified as a polar group. two polar groups with lone pairs of electrons can bind Fe 2+ cation through attractive forces with electrostatic interactions resulting in a coordinate covalent bond [28]. Thus, intermolecular forces between two groups can lead the pores to be opened, bring more surface area in activated carbon, and lead to high adsorption of iron from the solution.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Activator Type and Concentration on the Performance of Activated Carbon from Bengkirai Wood as Adsorbent to Reduce Iron Content in Water

Rahmawati

Tarmidzi

Islamiati

et al. 2022

MSF

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Iron is a major impurity in many water resources and leads to contamination in drinking water. One technology that can be used to reduce the iron content is adsorption using activated carbon. Activated carbon can be derived from biomass including forestry and agricultural waste. To produce an economic adsorbent, the researcher used bengkirai wood sawdust waste which contains 52.9% cellulose and 24% lignin. This material is treated by physical and chemical activation to produce activated carbon. However, there is no information on the effect of the type and concentration of activator on the performance of bengkirai wood activated carbon in reducing iron content. Thus, the purpose of this research is to understand the effect of activator type and concentration on the performance of activated carbon from bengkirai wood to adsorb iron content. There are five steps in this research which are preparation, carbonization, chemical activation, characterization and performance test. The raw material is prepared by screening to get an uniform size of bengkirai wood sawdust. Then, the uniformed bengkirai sawdust is physically activated in the carbonization step by heating it in the furnace at 600°C for 2 hours. After that, the carbon is activated using acid which are HCl, HNO3, and H2SO4 with concentrations of 0.1 M, 0.3 M and 0.5 M. The characterization done in this study are iodine number test and functional group test using Fourier Transform Infrared Spectroscopy (FTIR). The final step is performance test of activated carbon to adsorb iron in the water by contacting the activated carbon into water containing iron for 1 hour. The concentration of iron in the water is measured using Uv vis spectofometry. The result shows that the carbon activation with H2SO4 0.1 M produce activated carbon with the highest iodine number compared to the other type of activator and concentration. The iodine number for this activated carbon is 839.76 mg/g. However, the activated carbon treated using HNO3 shows the best performance to adsorb iron in water.

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“…The result suggested that Ca was strongly adsorbed by biochar while Fe was not bound. The different adsorption behavior of Ca 2þ and Fe 2þ /Fe 3þ on biochar mainly due to selective adsorption of biochar among Ca 2þ , Fe 2þ , Fe 3þ (Maneechakr & Karnjanakom 2019) and Mg 2þ (Yi & Chen 2018). Another possible explanation was that Fe loading on biochar required the formation of amorphous FeOOH (Bakshi et al 2021).…”

Section: Metals Adsorbed and Loaded On S-psbmentioning

confidence: 99%

Sediment metals adhering to biochar enhanced phosphorus adsorption in sediment capping

Cheng

Fan

Zhang

et al. 2021

Water Science and Technology

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Metal ions in sediment were inherent Ca and Fe sources for biochar modification. In this work, effect of Ca2+ and Fe2+ released from sediment on biochar for phosphorus adsorption was evaluated. Results showed that, raw peanut shell biochar (PSB) was poor in phosphorus adsorption (0.48 mg/g); sediment-triggered biochar (S-PSB) exhibited P adsorption capacity of 1.32 mg/g in capping reactor and maximum adsorption capacity of 10.72 mg/g in Langmuir model. Sediment released Ca2+ of 2.2–4.1 mg/L and Fe2+/Fe3+ of 0.2–9.0 mg/L. The metals loaded onto biochar surface in the forms of Ca-O and Fe-O, with Ca and Fe content of 1.47 and 0.29%, respectively. Sediment metals made point of zero charge (pHpzc) of biochar shifted from 5.39 to 6.46. The mechanisms of enhanced P adsorption by S-PSB were surface complexation of CaHPO4 followed by precipitation of Ca3(PO4)2 and Ca5(PO4)3(OH). Sediment metals induced modification of biochar and improvement of P adsorption, which was feasible to overcome the shortcomings of biochar on phosphorus control in sediment capping.

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Environmental surface chemistries and adsorption behaviors of metal cations (Fe³⁺, Fe²⁺, Ca²⁺ and Zn²⁺) on manganese dioxide-modified green biochar

Abstract: Manganese dioxide-modified green biochar exhibited excellent capacity for adsorption of Fe3+, Fe2+, Ca2+ and/or Zn2+.

Cited by 36 publications

References 39 publications

Network–Polymer–Modified Superparamagnetic Magnetic Silica Nanoparticles for the Adsorption and Regeneration of Heavy Metal Ions

Network–Polymer–Modified Superparamagnetic Magnetic Silica Nanoparticles for the Adsorption and Regeneration of Heavy Metal Ions

The Effect of Activator Type and Concentration on the Performance of Activated Carbon from Bengkirai Wood as Adsorbent to Reduce Iron Content in Water

Sediment metals adhering to biochar enhanced phosphorus adsorption in sediment capping

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