Arsenic transformation and adsorption by iron hydroxide/manganese dioxide doped straw activated carbon

Xiong, Ying; Tong, Qiang; Shan, Wei; Xing, Zhiqiang; Wang, Yuejiao; Wen, Siqi; Lou, Zhenning

doi:10.1016/j.apsusc.2017.04.145

Cited by 127 publications

(68 citation statements)

References 38 publications

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“…128 The authors indicated that the contact time and iron concentrations have no signicant effect on iron loading content, the use of KMnO 4 yielded teeth-like iron oxyhydroxide nanoparticles, while the absence of KMnO 4 pretreatment produced spherical nanoparticles. 129 Table 4 shows the comparison of arsenic adsorption on different iron modied activated carbon.…”

Section: Iron Oxy-hydroxides Doped Composite Adsorbentsmentioning

confidence: 99%

A critical review on arsenic removal from water using iron-based adsorbents

et al. 2018

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Section: Iron Oxy-hydroxides Doped Composite Adsorbentsmentioning

confidence: 99%

A critical review on arsenic removal from water using iron-based adsorbents

et al. 2018

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“…However, the bands at ν = 450, 520, and 720 cm −1 due to the stretching vibrations of Mn-O were not found in the FTIR spectra of the FM-MBC. It could be the amorphization of MnO 2 in the FM-MBC, which corresponded to XRD characterization of FM-MBC [25]. The adsorption bands at ν = 1622 and 1162 cm −1 became weakened in the FM-MBC after Cr(VI) adsorption than FM-MBC, and it could be seen that the band at ν = 1051 cm −1 of the FM-MBC shift from 1049 cm −1 to ν = 1051 cm −1 after Cr(VI) adsorption, which indicated that aromatic groups, carboxyls, and the hydroxyl groups associated with Fe and Mn involved in the adsorption process [40,46,47].…”

Section: Ftir Analysismentioning

confidence: 60%

“…The new peak corresponded to α-Fe2O3 standard peak (110) (PDF NO: 00-033-0664). Compared with MBC, no intensity crystalline typical peaks of MnO2 were found of FM-MBC, which represented the formation of the amorphous phase of the FM-MBC [25,26].…”

Section: Xrd Analysismentioning

confidence: 90%

Preparation and Characterization of Fe-Mn Binary Oxide/Mulberry Stem Biochar Composite Adsorbent and Adsorption of Cr(VI) from Aqueous Solution

Liang

Zhu

et al. 2020

IJERPH

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This study details the preparation of Fe-Mn binary oxide/mulberry stem biochar composite adsorbent (FM-MBC) from mulberry stems via the multiple activation by potassium permanganate, ferrous chloride, triethylenetetramine, and epichlorohydrin. The characteristics of FM-MBC had been characterized by SEM-EDS, BET, FT-IR, XRD, and XPS, and static adsorption batch experiments such as pH, adsorption time, were carried out to study the mechanism of Cr(VI) adsorption on FM-MBC and the impact factors. The results indicated that in contrast with the mulberry stem biochar (MBC), the FM-MBC has more porous on surface with a BET surface area of 74.73 m2/g, and the surface loaded with α-Fe2O3 and amorphization of MnO2 particles. Besides, carboxylic acid, hydroxyl, and carbonyls functional groups were also formed on the FM-MBC surface. At the optimal pH 2.0, the maximum adsorption capacity for Cr(VI) was calculated from the Langmuir model of 28.31, 31.02, and 37.14 mg/g at 25, 35, and 45 °C, respectively. The aromatic groups, carboxyls, and the hydroxyl groups were the mainly functional groups in the adsorption of Cr(VI). The mechanism of the adsorption process of FM-MBC for Cr(VI) mainly involves electrostatic interaction, surface adsorption of Cr(VI) on FM-MBC, and ion exchange.

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“…and Selion ASR3300FG resins [24]. After the sorption of arsenic on the ion exchange resins, the bands of O-H stretching vibration and C=C stretching vibration shifted and gave smaller peaks while the As-O peaks came in sight around 848 cm -1 to 888 cm -1 [25][26][27].…”

Section: Effect Of Ph On Arsenic Sorptionmentioning

confidence: 99%