Effect of nanohydroxyapatite on cadmium leaching and environmental risks under simulated acid rain

Zhao, Chenchen; Ren, Shuxia; Zuo, Qingqing; Wang, Shutao; Zhou, Yapeng; Liu, Wei; Liang, Shan

doi:10.1016/j.scitotenv.2018.01.267

Cited by 32 publications

(6 citation statements)

References 61 publications

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“…Notably, hydroxyapatite contains a large number of hydroxyl groups, which will consume H + through dissolution and increase the soil pH after being applied to the soil [16]. This result agrees with that of Zhao et al [30] and Cui et al [27], who showed that hydroxyapatite has a good liming effect for acidic soil and can effectively increase soil pH. The application of amendments caused different effects on SOC contents.…”

Section: Effects Of Simulated Acid Rain and Amendments On Soil Ph And...supporting

confidence: 82%

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Effects of Soil Amendments Applied on Cd and Pb Immobilization and Environmental Risks under Simulated Acid Rain

Zhang¹,

Li²,

Wang³

2022

Pol. J. Environ. Stud.

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A column leaching experiment was conducted to study the long-term remediation stability of hydroxyapatite, sepiolite, and biochar on soil Cd and Pb under simulated acid rain. The results indicated that simulated acid rain reduced soil pH and facilitated the conversion of residual fractions of Cd and Pb to acid-soluble fractions, thus increasing solubility, mobility, and availability of soil Cd and Pb. Lower leachate Cd and Pb contents were found in hydroxyapatite-treated soil than were found in sepiolite and biochar-treated soils. Meanwhile, Cd and Pb concentrations in hydroxyapatite met grade IV (Cd≤0.01 mg L -1 , Pb≤0.1 mg L -1 ) at the end of leaching (48 weeks), according to the Environmental quality standards for groundwater in China (GB14848-93). The application of hydroxyapatite, sepiolite, and biochar effectively immobilized Cd and Pb in both the water and simulated acid rain treatments. The immobilization efficiencies of Cd treated by hydroxyapatite, sepiolite, and biochar were 37.97~43.55%, 21.52~25.81%, and 26.58~33.87%, respectively, after the long-term leaching experiment. For Pb, these values were 36.35~48.65%, 24.90~29.26%, and 20.91~22.41%, respectively. Hydroxyapatite has better immobilization efficiency and maintains stronger and more durable stability than sepiolite and biochar. Therefore, hydroxyapatite is recommended to use in the remediation of Cd and Pb-contaminated agricultural soils under the condition of soil acidification.

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Section: Effects Of Simulated Acid Rain and Amendments On Soil Ph And...supporting

confidence: 82%

“…To evaluate the long-term environmental effects of Cd and Pb in the column leachate, the double constant model, parabolic model, exponential model and firstorder kinetic model were analyzed [30]. The four simulated models and correlation coefficient (R 2 ) are shown in Table 2.…”

Section: Effects Of Simulated Acid Rain and Amendments On The Solubil...mentioning

confidence: 99%

Effects of Soil Amendments Applied on Cd and Pb Immobilization and Environmental Risks under Simulated Acid Rain

Zhang¹,

Li²,

Wang³

2022

Pol. J. Environ. Stud.

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“…Mortar was immersed in artificial seawater, groundwater, and rainwater at a particular time, prepared according to [35,73]. Each component was analytically prepared by diluting reagent in distillated water.…”

Section: Methodsmentioning

confidence: 99%

“…The detailed compositions are indicated in Table 4. The composition of the rainwater was based on the molar ratio of H 2 SO 4 : HNO 3 (3:1) which was diluted until pH equal to 5.6 [73].…”

Section: Methodsmentioning

confidence: 99%

Analytical chemistry in technical approaches: immobilization of biosorbent waste containing heavy metals in cemented materials

et al. 2022

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An ecologically safe and economically justified method of stabilization of the used biosorbents was developed. Sorbent contaminated with heavy metals has been successfully solidified/stabilized using a hydraulic binder. The test results indicated that up to 1% of the biosorbent residue used could be added without compromising the compressive strength of the mortar. The compressive strength of the modified mortars did not change significantly even after 20 freeze/thaw cycles. The analytical methods such as Flame Atomization-Atomic Absorption Spectrometer, Graphite Furnace-Atomic Absorption Spectrometer, and Cold Vapor-Atomic Absorption Spectrometry were utilized to examine the leaching behavior of selected heavy metals during harsh condition exposure. The leachability of selected heavy metals was found to be below the limit allowed by the US EPA after immersion and agitation for 10 days in artificial water solutions (seawater, groundwater, and rainwater). X-Ray Diffraction and Brunauer–Emmett–Teller data showed no significant changes in the crystalline structure and surface area of the modified mortars after treatment. Research showed that mixing the adsorbent used with mortar was effective in immobilizing heavy metals and allowed the implementation of a so-called ‘zero waste’ management method. Graphical abstract

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“…Also, the sedimentation of the elements in the form of insoluble hydroxides and carbonates and organic complexes can increase. Moreover, when soil acidification occurs, heavy metals such as zinc and cadmium are mobilized, potentially leading to toxic concentrations (Smith, 1994;Zhao et al, 2018).…”

mentioning

confidence: 99%

The increase of rainfall erosivity and initial soil erosion processes due to rainfall acidification

Kavian

Alipour

Soleimani

et al. 2018

Hydrological Processes

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The drastic growth of population in highly industrialized urban areas, as well as fossil fuel use, is increasing levels of airborne pollutants and enhancing acid rain. In rapidly developing countries such as Iran, the occurrence of acid rain has also increased. Acid rain is a driving factor of erosion due to the destructive effects on biota and aggregate stability; however, little is known about its impact on specific rates of erosion at the pedon scale. Thus, the present study aimed to investigate the effect of acid rain at pH levels of 5.25, 4.25, and 3.75 for rainfall intensities of 40, 60, and 80 mm h−1 on initial soil erosion processes under dry and saturated soil conditions using rainfall simulations. The results were compared using a two‐way ANOVA and Duncan tests and showed that initial soil erosion rates with acidic rain and non‐acidic rain under dry soil conditions were significantly different. The highest levels of soil particle loss due to splash effects in all rainfall intensities were observed with the most acidic rain (pH = 3.75), reaching maximum values of 16 g m−2 min−1. The lowest levels of particle losses were observed in the control plot where non‐acidic rain was used, with values ranging from 3.8 to 8.1 g m−2 min−1. Similarly, under saturated soil conditions, the lowest level of soil particle loss was observed in the control plot, and the highest peaks of soil loss were observed for the most acidic rains (pH = 3.75 and pH = 4.25), reaching maximum average values of 40 g m−2 min−1. However, for saturated soils with acidic water but with non‐acidic rain, the highest soil particle loss was observed for the control plot for all the rainfall intensities. In conclusion, acidic rain has a negative impact on soils, which can be more intense with a concomitant increase in rainfall intensity. Rapid solutions, therefore, need to be found to reduce the emission of pollutants into the air, otherwise, rainfall erosivity may drastically increase.

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Effect of nanohydroxyapatite on cadmium leaching and environmental risks under simulated acid rain

Cited by 32 publications

References 61 publications

Effects of Soil Amendments Applied on Cd and Pb Immobilization and Environmental Risks under Simulated Acid Rain

Effects of Soil Amendments Applied on Cd and Pb Immobilization and Environmental Risks under Simulated Acid Rain

Analytical chemistry in technical approaches: immobilization of biosorbent waste containing heavy metals in cemented materials

The increase of rainfall erosivity and initial soil erosion processes due to rainfall acidification

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