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Frontiers of Environmental Science & Engineering

Front.Environ.Sci.Eng.    2014, Vol. 8 Issue (3) : 379-385
Effects of phosphorus concentration on Cr(VI) sorption onto phosphorus-rich sludge biochar
DING Wenchuan1,2,PENG Wenlong2,ZENG Xiaolan1,3,(),TIAN Xiumei2
Three Gorges Reservoir Area’s Ecology and Environment Key Laboratory of Ministry of Education, Chongqing University, Chongqing 400045, China
Department of Environmental Engineering, Chongqing University, Chongqing 400045, China
Department of Water Science and Engineering, Chongqing University, Chongqing 400045, China
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To investigate effects of phosphorus content on Cr(VI) sorption onto phosphorus-rich biochar, sewage sludge of different phosphorus concentrations from 4 to 60 mg·g-1 by dry weight were prepared and carbonized to make biochar for batch sorption experiments. Test results revealed that different phosphorous concentration of raw sludge had respective impacts on surface area, pore surface area, average pore diameter and pH value of derived biochar. The adsorption kinetics of phosphorus-rich biochar could be described by the pseudo-second-order model. The sorption isotherm data followed Langmiur model better than Freundlich model. Biochar produced from sludge with phosphorus concentration of 20 mg·g-1 gave the largest chromium sorption capacity, which could be attributed to its largest surface area and pores surface area comparing with those of biochars from sludge with other phosphorus concentrations. The chromium loaded biochar was analyzed using Fourier Transform Infrared Spectroscopy and X-ray Diffraction measurement. The results indicated that chemical functional groups hydroxyl and methyl on surface of biochar were involved in Cr(VI) binding and its reducing to Cr(III). Then, a portion of Cr(III) in form of various phosphate precipitates was bound onto biochar surface and the rest was released into the solution. The experimental results suggested that phosphorus played an important role in pore and surface area development of sludge biochar during pyrolytic process. It also could react with Cr(III) on the biochar surface that impacted on capacity of Cr(VI) removal from solution by sludge biochar. Therefore, phosphorus concentration in sludge should be considered when sludge pyrolytic residue would be reused for heavy metals sorbing.

Keywords phosphorus      biochar      sewage sludge      hexavalent chromium      adsorption     
Corresponding Authors: ZENG Xiaolan   
Issue Date: 19 May 2014
 Cite this article:   
DING Wenchuan,PENG Wenlong,ZENG Xiaolan, et al. Effects of phosphorus concentration on Cr(VI) sorption onto phosphorus-rich sludge biochar[J]. Front.Environ.Sci.Eng., 2014, 8(3): 379-385.
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DING Wenchuan
PENG Wenlong
ZENG Xiaolan
TIAN Xiumei
SB / (m2·g-1)22.8836.5639.7533.9019.34
Sm / (m2·g-1)10.6712.6314.907.252.54
Vt / (cm3·g-1)0.0720.0680.0780.0660.061
Dp / Å79.8074.6168.74101.05126.64
Fig.1  Sorption of Cr(VI) onto biochars at different contact times (sorbent: 20 g·L-1, initial Cr(VI) concentration: 200 g·L-1, reaction time: 0-24 h, initial pH: 4.0)
biocharqe exp/ (mg·g-1)pseudo-first-order modelpseudo-second-order model
qe cal./(mg·g-1)k1,ads/hr2qe cal./(mg·g-1)K2,ads/(g·mg-1·h-1)r2
Q° (mg·g-1)KL (L·mg-1)r2KF (mg·g-1)nr2
Fig.2  Sorption isotherms for Cr(VI) sorption onto biochars. (sorbent: 20 g·L-1, initial Cr(VI) concentration: 50-800 mg·L-1, reaction time: 24 h, initial pH: 4.0)
Fig.3  Phosphorus concentrations in raw sludge versus total Cr and Cr(VI) removal by biochars (sorbent: 20 g·L-1, initial Cr(VI) concentration: 200 mg·L-1, reaction time: 24 h, initial pH: 4.0)
Fig.4  FTIR spectra of biochar P20 before and after Cr(VI) loaded. (sorbent: 20 g·L-1, initial Cr(VI) concentration: 800 mg·L-1, reaction time: 24 h, initial pH: 4.0)
Fig.5  X-ray diffract spectrum of sludge biochar P20 before and after sorption: (a)Cr2O3, (b)CrPO4, (c)Cr5(P3O10)3, (d)KxCrO2 and (e)Cr(PO3)3 (sorbent: 20 g·L-1, initial Cr(VI) concentration: 800 mg·L-1, reaction time: 24 h, initial pH: 4.0)
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