Chuanfang Fan

Bio: Chuanfang Fan is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Activated carbon & Fluoride. The author has an hindex of 1, co-authored 2 publications receiving 1 citations.

Activated carbon lanthanum-loaded aluminum soil fluorine pollution repairing agent as well as preparation method and repairing method thereof

Abstract: The invention discloses an activated carbon lanthanum-loaded aluminum soil fluorine pollution repairing agent as well as a preparation method and a repairing method thereof, and relates to the technical field of soil improvement. The preparation method comprises the following steps: S1, mixing an Al solution and a La solution in equal proportion to obtain a mixed solution with Al and La concentrations of 0.5-1 M; S2, dipping activated carbon into the mixed solution obtained in the step S1, and carrying out ultrasonic oscillation after dipping is completed; S3, adding a NaOH solution into the mixture treated in the step S2 for adjusting the pH value to 7-8, and oscillating and uniformly mixing the mixture after the pH regulation at a certain temperature, andaging the mixture; S4 centrifuging, cleaning, dehydrating and drying the aged mixture to obtain the activated carbon lanthanum-loaded aluminum soil fluorine pollution repairing agent. The remediationagent prepared by the preparation method can be used in high-fluorine-content contaminated soil, wherein the content of water-soluble fluorine in the soil can be effectively reduced, and the reductionrate of the water-soluble fluorine reaches 91% or above.

Bioavailability Assessment of Heavy Metals Using Various Multi-Element Extractants in an Indigenous Zinc Smelting Contaminated Site, Southwestern China.

Abstract: Despite recent studies have investigated the strong influences of smelting activities on heavy metal contamination in the soil environment, little studies have been conducted on the current information about the potential environmental risks posed by toxic heavy metals in smelting contaminated sites. In the present study, a combination of the bioavailability, speciation, and release kinetics of toxic heavy metals in the indigenous zinc smelting contaminated soil were reliably used as an effective tool to support site risk assessment. The bioavailability results revealed that the bioavailable metal concentrations were intrinsically dependent on the types of chemical extractants. Interestingly, 0.02 mol/L EDTA + 0.5 mol/L CH3COONH4 was found to be the best extractant, which extracted 30.21% of Cu, 31.54% of Mn, 2.39% of Ni and 28.89% of Zn, respectively. The sequential extraction results suggested that Cd, Pb, and Zn were the most mobile elements, which would pose the potential risks to the environment. The correlation of metal bioavailability with their fractionation implied that the exchangeable metal fractions were easily extracted by CaCl2 and Mehlich 1, while the carbonate and organic bound metal fractions could be extracted by EDTA and DTPA with stronger chelating ability. Moreover, the kinetic modeling results suggested that the chemical desorption mechanism might be the major factor controlling heavy metal release. These results could provide some valuable references for the risk assessment and management of heavy metals in the smelting contaminated sites.