Activated magnetic biochar by one-step synthesis: Enhanced adsorption and coadsorption for 17β-estradiol and copper

Yin, Zhaoyi; Liu, Yunguo; Liu, Shaobo; Jiang, Luhua; Tan, Xiaofei; Zeng, Guangming; Li, Meifang; Liu, Sijia; Tian, Si‐rong; Fang, Ying

doi:10.1016/j.scitotenv.2018.05.130

Cited by 152 publications

(41 citation statements)

References 65 publications

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“…According to Table 1, the experimental data are well fitted with the pseudo-second order kinetics and the associated curves are shown in Figure 6. The pseudo-second order kinetics is characteristic for magnetic biochar adsorbents and the evaluated k2 values are similar to corresponding literature k2 values [15,[21][22][23][24]30]. Table 1.…”

Section: Kinetic Studiessupporting

confidence: 83%

“…The value maximum adsorption capacity evaluated applying the Langmuir adsorption model has been found to be qmax = 0.40 mmol•g −1 (25.4 mg•g −1 ) and qmax = 1.0 mmol•g −1 (63.5 mg•g −1 ) for the Cu(II) adsorption by pncm and pncom, respectively. This values are in the range of values determined for Cu(II) adsorption by magnetized and chemically modified biochars [15,[21][22][23][24]. Figure 4 shows FTIR spectra of solid samples corresponding to experiments performed at pH 3 and pH 6, and different Cu(II) concentrations.…”

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confidence: 61%

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Copper Adsorption by Magnetized Pine-Needle Biochar

et al. 2019

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The Cu(II) adsorption from aqueous solutions by magnetic biochar obtained from pine needles has been studied by means of batch-type experiments. The biochar fibers have been magnetized prior (pncm: carbonized-magnetized pine needles) and after oxidation (pncom: carbonized-oxidized-magnetized pine needles) and have been used as adsorbents to study the presence of carboxylic moieties on the magnetization and following adsorption process. The effect of pH (2–10), initial metal concentration (10−5–9·10−3 mol·L−1) and contact time (0–60 min) has been studied by varying the respective parameter, and the adsorbents have been characterized by Fourier transform infrared (FTIR) and X-ray diffraction (XRD) measurements prior and after Cu(II)-adsorption. FTIR measurements were performed to investigate the formation of surface species and XRD measurements to record possible solid phase formation and characterize formed solids, including the evaluation of their average crystal size. The data obtained from the batch-type studies show that the oxidized magnetic biochar (pncom) presents significantly higher adsorption capacity (1.0 mmol g−1) compared to pncm (0.4 mmol g−1), which is ascribed to the synergistic effect of the carboxylic moieties present on the pncom surface, and the adsorption process follows the pseudo-second order kinetics. On the other hand, the FTIR spectra prove the formation of inner-sphere complexes and XRD diffractograms indicate Cu(II) solid phase formation at pH 6 and increased metal ion concentrations.

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Section: Kinetic Studiessupporting

confidence: 83%

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confidence: 61%

Copper Adsorption by Magnetized Pine-Needle Biochar

et al. 2019

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“…The isotherms ( Fig. 1(c)) were determined as type IV for the AMBC, which was the characteristics of mesoporous material and the reason for the significant volume of nitrogen adsorbed at relative high pressure [14,21]. The specific surface area was measured as 396.9 m 2 g −1 for the AMBC, about 2.0 and 1.4 times larger than that of the BC and MBC (Table S1).…”

Section: Characteristics Of the Adsorbentsmentioning

confidence: 91%

“…The AMBC was synthesized using a method previously described with some modifications [14], as shown in Fig. S1.…”

Section: Adsorbents Synthesismentioning

confidence: 99%

“…Furthermore, magnetization and carbonization are two traditionally independent procedures for magnetic BC preparation. In recent years, the two processes were successfully incorporated into one step to cut the time and energy costs [14,15]. However, the adsorption performance of BC was sacrificed on a large scale due to the negative effects of magnetic particles.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic biochar from alkali-activated rice straw for removal of rhodamine B from aqueous solution

Ren

Chen

Wang

et al. 2019

Environmental Engineering Research

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To address organic dye wastewater, economic and effective adsorbents are required. Here, magnetic biochar from alkali-activated rice straw (AMBC) was successfully synthesized using one-step magnetization and carbonization method. The alkaline activation caused the large specific surface area, high pore volume and abundant oxygen-containing groups of the AMBC, and the magnetization gave the AMBC a certain degree of electropositivity and fast equilibrium characteristics. These characteristics collectively contributed to a relative high adsorption capacity of 53.66 mg g<sup>−1</sup> for this adsorbent towards rhodamine B (RhB). In brief, RhB can spontaneously adsorb onto the heterogeneous surface of the AMBC and reach the equilibrium in 60 min. Although the initial pH, ionic strength and other substances of the solution affected the adsorption performance of the AMBC, it could be easily regenerated and reused with considerable adsorption content. Based on the results, H-bonds, π–π stacking and electrostatic interactions were speculated as the primary mechanisms for RhB adsorption onto the AMBC, which was also demonstrated by the FTIR analysis. With the advantageous features of low cost, easy separation, considerable adsorption capacity and favorable stability and reusability, the AMBC would be a potential adsorbent for removing organic dyes from wastewater.

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Carbon Allotropes in a Sustainable Environment

Ansari¹

2023

Carbon Allotropes and Composites

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Activated magnetic biochar by one-step synthesis: Enhanced adsorption and coadsorption for 17β-estradiol and copper

Cited by 152 publications

References 65 publications

Copper Adsorption by Magnetized Pine-Needle Biochar

Copper Adsorption by Magnetized Pine-Needle Biochar

Magnetic biochar from alkali-activated rice straw for removal of rhodamine B from aqueous solution

Carbon Allotropes in a Sustainable Environment

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