Phosphate removal by refined aspen wood fiber treated with carboxymethyl cellulose and ferrous chloride

Eberhardt, Thomas L.; Min, Soo‐Hong; Han, James S.

doi:10.1016/j.biortech.2005.10.040

Cited by 92 publications

(57 citation statements)

References 14 publications

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“…A reasonable explanation for these results from the P adsorption isotherm is that the surface of the untreated biochar is often negatively charged, whereas the treatment with ZnCl 2 (activated biochar with ZnCl 2 ) produces more positive sites on the surface of the biochar. Eberhardt et al (2006) and Yao et al (2011a) also obtained similar results. They indicated that the surface of the biochar is often negatively charged, causing it to repel negatively charged ions such as Fig.…”

Section: Effect Of Activation Methods For Biochar On Phosphorus Adsorpsupporting

confidence: 89%

Evaluation of phosphorus adsorption capacity of sesame straw biochar on aqueous solution: influence of activation methods and pyrolysis temperatures

Park

Kim

et al. 2015

Environ Geochem Health

127

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The phosphorus (P) adsorption characteristic of sesame straw biochar prepared with different activation agents and pyrolysis temperatures was evaluated. Between 0.109 and 0.300 mg L(-1) in the form of inorganic phosphate was released from raw sesame straw biochar in the first 1 h. The release of phosphate was significantly enhanced from 62.6 to 168.2 mg g(-1) as the pyrolysis temperature increased. Therefore, sesame straw biochar cannot be used as an adsorbent for P removal without change in the physicochemical characteristics. To increase the P adsorption of biochar in aqueous solution, various activation agents and pyrolysis temperatures were applied. The amount of P adsorbed from aqueous solution by biochar activated using different activation agents appeared in the order ZnCl2 (9.675 mg g(-1)) > MgO (8.669 mg g(-1)) ⋙ 0.1N-HCl > 0.1N-H2SO4 > K2SO4 ≥ KOH ≥ 0.1N-H3PO4, showing ZnCl2 to be the optimum activation agent. Higher P was adsorbed by the biochar activated using ZnCl2 under different pyrolysis temperatures in the order 600 °C > 500 °C > 400 °C > 300 °C. Finally, the amount of adsorbed P by activated biochar at different ratios of biochar to ZnCl2 appeared in the order 1:3 ≒ 1:1 > 3:1. As a result, the optimum ratio of biochar to ZnCl2 and pyrolysis temperature were found to be 1:1 and 600 °C for P adsorption, respectively. The maximum P adsorption capacity by activated biochar using ZnCl2 (15,460 mg kg(-1)) was higher than that of typical biochar, as determined by the Langmuir adsorption isotherm. Therefore, the ZnCl2 activation of sesame straw biochar was suitable for the preparation of activated biochar for P adsorption.

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Section: Effect Of Activation Methods For Biochar On Phosphorus Adsorpsupporting

confidence: 89%

Evaluation of phosphorus adsorption capacity of sesame straw biochar on aqueous solution: influence of activation methods and pyrolysis temperatures

Park

Kim

et al. 2015

Environ Geochem Health

127

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“…In adsorption processes, diverse adsorbents such as red mud, activated alumina, polymeric ligand exchangers, iron/aluminum-coated sand, calcium-based adsorbents, sugarcane bagasse, sawdust, etc. have been studied as adsorbents for phosphate removal (Ayoub et al 2001;Karthikeyan et al 2002;Del Bubba et al 2003;Eberhardt et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Removal of phosphorus from aqueous solutions using chemically modified sawdust of Aleppo pine (Pinus halepensis Miller): kinetics and isotherm studies

Benyoucef

Amrani

2011

Environmentalist

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In the present study, chemically modified Aleppo pine (Pinus halepensis Miller) sawdust was used for the removal of phosphate from water. Biosorbent preparation process included size fractionation, extraction for surface activation, acid prehydrolysis, and treatment with urea. Sorption of phosphate ions onto biosorbent was studied using the batch technique. The effect of different parameters such as contact time, adsorbate concentration, and temperature was investigated. The adsorption kinetics data were best described by the pseudo-second-order rate equation, and equilibrium was achieved after 40 and 80 min for modified and unmodified sawdust, respectively. The Langmuir and Freundlich equations for describing adsorption equilibrium were applied to data. The constants and correlation coefficients of these isotherm models were calculated and compared. The adsorption isotherms obey the Freundlich equation. The thermodynamic parameters like free energy, enthalpy, and entropy changes for the adsorption of phosphate ions have been evaluated, and it has been found that the reaction was spontaneous and endothermic in nature. The low value of activated energy of adsorption, 3.088-3.540 kJ mol -1 , indicates that the phosphate ions are easily adsorbed on the sawdust. Results suggest that the prepared chemically modified Aleppo pine sawdust has potential in remediation of contaminated waters by phosphate.

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“…The maximum adsorption capacities of PSB were 3.67, 5.50, and 6.79 mg g -1 at 10, 20, and 30°C, respectively. Furthermore, PSB has a quite high adsorption capability for phosphate compared to reported other biomaterials, e.g., 4.8 mg g -1 for okara (Nguyen et al 2013), 4.3 mg g -1 for aspen wood fiber (Eberhardt et al 2006), 2.3 mg g -1 for juniper fiber (Han et al 2005), and 4.4 mg g -1 for palm fiber (Riahi et al 2009). The adsorption capacities for PSB increased with an increasing temperature, suggesting that the system is an endothermic and chemical process.…”

Section: Adsorption Equilibrium Of Phosphate On Psbmentioning

confidence: 99%

“…However, phosphate was not detected in the samples with oak wood and peanut shells. Normally, the surfaces of charcoals are negatively charged, which makes them unlikely to sorb negatively charged ions such as phosphate (Lee et al 2010;Eberhardt et al 2006). The measured zeta potentials of the various biochars were negative, as shown in Table 3, confirming that the biochars employed here were negatively charged under circumneutral conditions.…”

Section: Textural Properties Of Biochar Derived From Various Biomassmentioning

confidence: 99%

Kinetic study on phosphate removal from aqueous solution by biochar derived from peanut shell as renewable adsorptive media

Jung

Hwang

Ahn

et al. 2015

Int. J. Environ. Sci. Technol.

162

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As an alternative strategy for phosphate removal, biochar (black carbon) has characteristics superior to those of widely used adsorptive media, from both economic and environmental points of view. In this study, various types of biochar derived from oak wood, bamboo wood, maize residue, soybean stover, and peanut shell were tested for evaluation of phosphate removal. After 24 h of reaction time, the phosphate removal was limited (2.0-9.4 %) in case of general adsorptive media. However, interestingly, among various biochars, peanut shell-derived biochar (PSB) exhibited the best performance, showing the highest phosphate removal rate, 61.3 % (3.8 mg PO 4-P g PSB -1 ). We attribute this high value to the proper structural properties of PSB, such as BET-specific surface area of 348.96 m 2 g -1 and mineral/phosphorus ratio (Mg/ P = 3.46 and Ca/P = 47.6). Adsorption equilibrium and kinetics of phosphate at different temperature (10, 20, and 30°C) were well explained in the whole experimental region by Langmuir isotherm and pseudo-second-order kinetic models, respectively. The maximum adsorption capacity of PSB was 6.79 mg g -1 for phosphate at 30°C. These findings suggest that PSB has great potential as an alternative and renewable adsorptive media for phosphate removal.

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Phosphate removal by refined aspen wood fiber treated with carboxymethyl cellulose and ferrous chloride

Cited by 92 publications

References 14 publications

Evaluation of phosphorus adsorption capacity of sesame straw biochar on aqueous solution: influence of activation methods and pyrolysis temperatures

Evaluation of phosphorus adsorption capacity of sesame straw biochar on aqueous solution: influence of activation methods and pyrolysis temperatures

Removal of phosphorus from aqueous solutions using chemically modified sawdust of Aleppo pine (Pinus halepensis Miller): kinetics and isotherm studies

Kinetic study on phosphate removal from aqueous solution by biochar derived from peanut shell as renewable adsorptive media

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