PASSIVATION OF LEAD IN SOIL BY FULVIC ACID-NANO-ZERO-VALENT IRON COMPLEX

HUO Jiajia; LUO Shengxu; WANG Yanshi; WANG Xinwei; DENG Qin; LI Jinying

doi:10.13205/j.hjgc.202204016

Volume 40 Issue 4

Apr. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(4): 112-120

HUO Jiajia, LUO Shengxu, WANG Yanshi, WANG Xinwei, DENG Qin, LI Jinying. PASSIVATION OF LEAD IN SOIL BY FULVIC ACID-NANO-ZERO-VALENT IRON COMPLEX[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 112-120. doi: 10.13205/j.hjgc.202204016

Citation:

HUO Jiajia, LUO Shengxu, WANG Yanshi, WANG Xinwei, DENG Qin, LI Jinying. PASSIVATION OF LEAD IN SOIL BY FULVIC ACID-NANO-ZERO-VALENT IRON COMPLEX[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(4): 112-120. doi: 10.13205/j.hjgc.202204016

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PASSIVATION OF LEAD IN SOIL BY FULVIC ACID-NANO-ZERO-VALENT IRON COMPLEX

doi: 10.13205/j.hjgc.202204016

School of Science, Hainan University, Haikou 570228, China

Received Date: 2021-06-19
Available Online: 2022-07-06

Abstract

Abstract

In order to reduce the biological activity of heavy metals in soil, composites were made using fulvic acid (FA) extracted from selenium-enriched soil and nano-zero-valent iron (NZVI) prepared by conventional methods with different FA mass ratios. The composites were characterized by SEM, FTIR and XRD. Trough soil cultivation experiments, the effect of each compound on the occurrence of DTPA with lead added externally in soil under different dosages and reaction times were studied, and analyzed the morphological changes with Tessier method to discuss its passivation consequent. The results showed that FA and NZVI formed composites successfully with different FA mass ratios; under the same dosage, the effective state of DTPA of lead in the soil decreased with the increase of the FA mass ratio in the composites; when the composites with 10% FA mass was added to the soil in 2% (20.0 g/kg), the DTPA effective state of lead in the soil was reduced by 83.01% on the 10th day; after adding the composites, the lead in the soil transformed significantly from the exchangeable state and the carbonate combined state to Fe-Mn oxide combined state and the residual state, and the organic bound state was unchanged basically. These changes were especially significant when the compound with 1% FA mass was added, making the exchangeable state and the carbonate bound state reduced respectively by 50.61% and 66.90%. Therefore, based on different morphological characterization methods, the active forms of soil lead showed a downward trend, indicating that the prepared composite had a certain passivation effect on soil lead, but the mechanism was different, and the passivation laws shown were different.
- lead(Pb),
- fulvic acid and nano-zero-valent iron complex(FA-NZVI),
- occurrence form,
- passivation

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References(30)

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