Original Research Article

Zero-valent iron doped carbons readily developed from sewage sludge for lead removal from aqueous solution


Chaomeng Dai , Xiaoya Sun , Xuefei Zhou , Yalei Zhang , Yiming Su

DOI:10.1016/j.jes.2015.03.018

Received December 17, 2014,Revised March 07, 2015, Accepted March 09, 2015, Available online June 15, 2015

Volume 36,2015,Pages 1-8

Low-cost but high-efficiency composites of iron-containing porous carbons were prepared using sewage sludge and ferric salts as raw materials. Unlike previous time- and energy-consuming manufacturing procedures, this study shows that pyrolyzing a mixture of sludge and ferric salt can produce suitable composites for lead adsorption. The specific surface area, the total pore volume and the average pore width of the optimal composite were 321 m2/g, 0.25 cm3/g, and 3.17 nm, respectively. X-ray diffraction analysis indicated that ferric salt favored the formation of metallic iron, while Fourier transform infrared spectroscopy revealed the formation of hydroxyl and carboxylic groups. The result of batch tests indicated that the adsorption capacity of carbons activated with ferric salt could be as high as 128.9 mg/g, while that of carbons without activation was 79.1 mg/g. The new manufacturing procedure used in this study could save at least 19.5 kJ of energy per gram of activated carbon.

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