Abstract
The simultaneous adsorption of heavy metals (Pb, Cd) and organic pollutant (tetracycline (TC)) by a sewage sludge-derived vermicompost was investigated. The maximal adsorption capacity for Pb, Cd, and TC in a single adsorptive system calculated from Langmuir equation was 12.80, 85.20, and 42.94 mg L−1, while for mixed substances, the adsorption amount was 2.99, 13.46, and 20.89 mg L−1, respectively. The adsorption kinetics fitted well to the pseudo-second-order model, implying chemical interaction between adsorbates and functional groups, such as –COOH, –OH, –NH, and –CO, as well as the formation of organo-metal complexes. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET) specific surface area measurement were adopted to gain insight into the structural changes and a better understanding of the adsorption mechanism. The sewage sludge-derived vermicompost can be a low cost and environmental benign eco-material for high efficient wastewater remediation.
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This work was supported by the National Natural Science Foundation of China (No. 51509087) and the Provincial Natural Science Foundation of Hunan (No. 2015jj3047).
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Responsible editor: Bingcai Pan
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He, X., Zhang, Y., Shen, M. et al. Vermicompost as a natural adsorbent: evaluation of simultaneous metals (Pb, Cd) and tetracycline adsorption by sewage sludge-derived vermicompost. Environ Sci Pollut Res 24, 8375–8384 (2017). https://doi.org/10.1007/s11356-017-8529-0
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DOI: https://doi.org/10.1007/s11356-017-8529-0