Characteristics and factors influencing Pb(II) desorption from a Chinese clay by citric acid

ABSTRACT

Soil contamination by heavy metals has attracted worldwide attention, since its highly toxicity and potential threaten to the human health. Thus, in this study, the desorption behaviors of Pb(II) by citric acid from a Chinese clay were evaluated. According to the results, Pb(II) removal percentage reached around 60% within 2 h. The acidic condition, relative high concentration of citric acid and contamination levels were found to be beneficial for Pb(II) desorption. During the desorption process, the originally fixed Pb(II) was first replaced by H⁺, especially at low selectivity sorption sites. The released Pb(II) was then chelated by organic ligands from citric acid.

KEYWORDS:

• Citric acid
• clay
• desorption behavior
• mechanism
• Pb(II)

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Funding

The research presented herein is supported by the National Natural Science Foundation of China (Grant 51308310, 51508503), the China Postdoctoral Science Foundation funded project (Grant No. 2016M591756), and the Open Project Program of MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University (Grant No. 2016P03). The research is also supported by Bureau of Housing and Urban-Rural Development of Suzhou and Soft Science Research Program from Suzhou Association for Science and Technology.

Additional information

Funding

The research presented herein is supported by the National Natural Science Foundation of China (Grant 51308310, 51508503), the China Postdoctoral Science Foundation funded project (Grant No. 2016M591756), and the Open Project Program of MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University (Grant No. 2016P03). The research is also supported by Bureau of Housing and Urban-Rural Development of Suzhou and Soft Science Research Program from Suzhou Association for Science and Technology.