Ethylenediamine-modified activated carbon for aqueous lead adsorption

Zhu, Jianzhong; Yang, John; Deng, Baolin

doi:10.1007/s10311-009-0217-y

Cited by 47 publications

(20 citation statements)

References 12 publications

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“…From the experimental data, sorption of lead by the unmodified sorbents (edible and toxic mushroom) had a wider sorption pH region (4.5-5.8) compared to the modified (pH 5.0), as shown in Figure 5C. This was attributed to the fact that modifications lowered the point of zero charge (pH pzc ) which resulted in more negatively charged surfaces contributing to the observations made by Zhu, Yang, and Deng [110]. In addition, lead forms polynuclear complexes containing two or more lead atoms, in the presence of ligands at different pH conditions, favoring attachment of the metal ion onto the ligand [111].…”

Section: Effect Of Ph On Adsorption Of Metal Ions: Adsorption Of Metamentioning

confidence: 68%

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Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

Bii¹,

Mwangi²,

Wanjau³

et al. 2016

J Pollut Eff Cont

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The dispersal of toxic heavy metals by water from natural and anthropogenic is a worldwide environmental concern due to pollution. Despite some metals playing an important role in body, they are toxic when the level exceeds the tolerance limits while others such as lead have no known physiological value to human beings. Since heavy metals cannot be degraded, then their removal from drinking water is necessary. Mushrooms are readily available in Bomet County and their metal removal ability was investigated. The study aimed at removing heavy metals from water by adsorption using mushroom, as a cost-effective and sustainable method. The raw mushroom was modified with sodium hydroxide and characterization of both the parent material and its modified form was done using Fourier Transform Infrared spectrometry (FTIR). Sorption experiments were carried out using the batch adsorption method and sorption parameters including pH, contact time, adsorbent dose and initial metal ion concentration investigated. The results found out that the sorption capacity for cadmium ions ranged from 1.826-25.285 mg/g by the unmodified edible mushroom (UEM), the modified edible mushroom (EM), unmodified toxic mushroom (UTM) and modified toxic mushroom (TM). For copper ions, sorption capacity ranged from 0.002-4.097 mg/g, while that of the lead ions ranged from 1.345-2.593 mg/g by the UEM, EM, UTM and TM respectively. The sorption capacity showed improvement on modification as sorption of cadmium increased from 1.826-25.285 mg/g by the UEM, EM, UTM and TM. At a pH range of 4-6, the sorbent material was found to remove up to 90% of the metals. The sorbent material had a removal efficiency of 95% of the metals in less than 20 minutes. The UEM and UTM fitted well in Langmuir adsorption isotherm model for cadmium and lead ions. For copper ions, UEM, EM, UTM and TM fitted in the Freundlich model. TM for lead ions best fitted in the Freundlich model. The bio-sorption kinetics was determined by fitting first-order-Lagergreg and Pseudo-second-order kinetics models to the experimental data. It was found that the data for lead was better described by the pseudo-second-order model. For copper ion, the data was best described by Ho's pseudo second order for UEM and UTM, cadmium ions for all sorbents was best described by Lagergreg's first-order kinetics. The FTIR analysis suggested the possibility of the participation of carboxyl groups in metal uptake. The levels of dissolved organic carbon (DOC) were found to be 19.0 mg/L in the raw material and 2.19 mg/L after modification. It was confirmed that modification minimized secondary pollution. This indicated that mushrooms have a potential application for the remediation of metal polluted waters.

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Section: Effect Of Ph On Adsorption Of Metal Ions: Adsorption Of Metamentioning

confidence: 68%

“…This was later followed by a slower uptake rate leading to a steady state where no significant adsorption occurred. Sorption by UTM attributed to the fact that modification lowered pH pzc which resulted in more negatively charged surfaces contributing to the observations made by Zhu, Yang, and Deng [110].…”

Section: Effect Of Contact Timementioning

confidence: 82%

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

Bii¹,

Mwangi²,

Wanjau³

et al. 2016

J Pollut Eff Cont

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“…As such, the Redlich-Peterson model was more suitable in describing the uneven surfaces of physical and chemical adsorption. Under the Langmuir adsorption model, the maximum adsorption capacity of MCS for Pb 2+ was 437.94 mg·g −1 at 293 K. This value was far higher than those of common adsorbents reported in literatures [17][18][19][20]. Given the intercept and slope of the fitted line in Figure 6, the adsorption thermodynamic parameters, such as ∆S, ∆H, and ∆G were calculated in accordance with Eqs.…”

Section: Adsorption Isothermal Curves and Adsorption Thermodynamic Chmentioning

confidence: 95%

Synthesis of Mesoporous Calcium Silicate by Template Method and Its Adsorption Characteristic for Pb2+

Liu¹,

Li²,

Liu³

et al. 2017

dteees

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Abstract. Mesoporous calcium silicate (MCS) was synthesized by template method using calcium nitrate tetrahydrate and sodium metasilicate nonahydrate as raw materials, cetyl trimethyl ammonium bromide-tetramethyl ammonium hydroxide as template. Its structure was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Brunuaer-Emmett-Teller (BET) surface analysis, and scanning electron microscopy (SEM

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“…The peak at 3,433 cm -1 is related to hydroxyl groups (-OH) stretch from deprotonation process of the pristine and modified activated carbon. The wide peak at (1,550 to 1,750 cm -1 shows the asymmetric stretch of the carboxylate (-COO-) group [1,11,22]. The surface properties of the activated carbon were investigated by N 2 adsorption (TriStar II 3020 Micromeritics); and the analytical results for the adsorption/desorption isotherms are shown in Table 1.…”

Section: Characterization Of the Modified Activated Carbonmentioning

confidence: 99%

“…However, they have a limited use due to some disadvantages [10]. Adsorption has been proved as one of the most efficient methods for the removal of heavy metals from aqueous media [11]. Activated carbon has shown great potential for the removal of various inorganic, organic pollutants and radionuclides removal due to properties such as large surface area, microporous structure, and high adsorption capacity [12][13][14][15].…”

mentioning

confidence: 99%

Adsorption of Chromium (VI) onto Activated Carbon Modified with KMnO4

Pang¹,

Liu²,

Kinoshita³

et al. 2015

JCCE

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Abstract:The adsorption capacity of activated carbon modified with KMnO 4 (potassium permanganate) for Cr(VI) from aqueous solution was investigated. The modified activated carbon was characterized by SEM (scanning electron microscopy), FT-IR (Fourier transform infrared spectrometer), and N 2 adsorption/desorption tests. Adsorption of Cr(VI) from aqueous solution onto the activated carbon was investigated in a batch system. In the present study, the effect of various parameters such as pH, contact time and initial concentration on the adsorption capacity were determined by ICP-AES (inductively coupled plasma atomic emission spectrometry). The Cr(VI) adsorption on the activated carbon conforms to the Langmuir and Freundlich isothermal adsorption equation. The rates of adsorption were found to conform to pseudo-second order kinetic. The modified activated carbon can be an effective adsorbent for Cr(VI) from the aqueous solution.

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Ethylenediamine-modified activated carbon for aqueous lead adsorption

Cited by 47 publications

References 12 publications

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

Synthesis of Mesoporous Calcium Silicate by Template Method and Its Adsorption Characteristic for Pb2+

Adsorption of Chromium (VI) onto Activated Carbon Modified with KMnO4

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