Exploratory of immobilization remediation of hydroxyapatite (HAP) on lead-contaminated soils

Wang, Yifan; Li, Ruizhen; Liu, Wenzhu; Cheng, Li; Jiang, Qing; Zhang, Ying

doi:10.1007/s11356-019-05887-4

Cited by 29 publications

(9 citation statements)

References 32 publications

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“…Phosphates, manures, and biochars can all reduce heavy metal solubility through diverse immobilization mechanisms such as precipitation, complexation, ion exchange, and adsorption [ 10 , 11 , 12 , 13 , 14 , 15 ]. We found that the amendments not only decreased heavy metal bioavailability but also mitigated heavy metal contents in plants, but the effectiveness varied with amendment type and dose.…”

Section: Discussionmentioning

confidence: 99%

“…Due to its chemical composition, HAP can release OH - to enhance soil pH, hence inducing the liming effect [ 10 , 11 ]. In addition, the pH values of OM and BC in our present study were 8.58 and 9.64, respectively; thus, they induced liming effects.…”

Section: Discussionmentioning

confidence: 99%

“…The commonly used amendments include natural organic materials, such as compost, sewage sludge, biochar, humic substances, and plant extracts and exudates; inorganic materials such as lime and phosphate; and chemical chelators such as ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), ethylenediaminedisuccinic acid (EDDS), malic acid, and citric acid. Many amendments can immobilize heavy metals through precipitation, complexation, ion exchange, and adsorption, but they have different specific characteristics and dominant remediation mechanisms [ 10 , 11 , 12 , 13 , 14 , 15 ]. In addition, when amendments are used in the remediation of contaminated agricultural fields, their effects on crop growth and heavy metal accumulation should be taken into account, considering the potential human health risks of heavy metals in the food chain [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Soil Amendments on Heavy Metal Immobilization and Accumulation by Maize Grown in a Multiple-Metal-Contaminated Soil and Their Potential for Safe Crop Production

Wang

Zhang

Cheng

et al. 2020

Toxics

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Soil amendments have been proposed for immobilizing metallic contaminants, thus reducing their uptake by plants. For the safe production of crops in contaminated soil, there is a need to select suitable amendments that can mitigate heavy metal uptake and enhance crop yield. The present experiment compared the effects of three amendments, hydroxyapatite (HAP), organic manure (OM), and biochar (BC), on plant growth and heavy metal accumulation by maize in an acidic soil contaminated with Cd, Pb, and Zn, and their potential for safe crop production. Toxicity characteristic leaching procedure (TCLP) tests, energy dispersive X-ray spectroscopy (EDS) analysis, and X-ray diffraction (XRD) analysis were used to evaluate the effectiveness and mechanisms of heavy metal immobilization by the amendments. The results showed that shoot and root biomass was significantly increased by HAP and 1% OM, with an order of 1% HAP > 0.1% HAP > 1% OM, but not changed by 0.1% OM and BC (0.1% and 1%). HAP significantly decreased Cd, Pb, and Zn concentrations in both shoots and roots, and the effects were more pronounced at the higher doses. OM decreased the shoot Cd and Pb concentrations and root Zn concentrations, but only 1% OM decreased the shoot Zn and root Pb concentrations. BC decreased the shoot Cd and Pb concentrations, but decreased the shoot Zn and root Pb concentrations only at 1%. HAP decreased the translocation factors (TFs) of Cd, Pb, and Zn (except at the 0.1% dose). OM and BC decreased the TFs of Cd and Zn, respectively, at the 1% dose but showed no significant effects in other cases. Overall, plant P, K, Fe, and Cu nutrition was improved by HAP and 1% OM, but not by 0.1 OM and BC. Soil pH was significantly increased by HAP, 1% OM, and 1% BC, following an order of 1% HAP > 1% OM > 0.1% HAP > 1% BC. The TCLP levels for Cd, Pb, and Zn were significantly reduced by HAP, which can be partly attributed to its liming effects and the formation of sparingly soluble Cd-, Pb-, and Zn-P-containing minerals in the HAP-amended soils. To some extent, all the amendments positively influenced plant and soil traits, but HAP was the optimal one for stabilizing heavy metals, reducing heavy metal uptake, and promoting plant growth in the contaminated soil, suggesting its potential for safe crop production.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Soil Amendments on Heavy Metal Immobilization and Accumulation by Maize Grown in a Multiple-Metal-Contaminated Soil and Their Potential for Safe Crop Production

Wang

Zhang

Cheng

et al. 2020

Toxics

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“…2-4): HAP is dissolved in acidic soil, then Cd ions are adsorbed on the surface of HAP to form phosphate precipitates. Cd 2+ with Ca 2+ ion exchange resulting in the formation of a Cd-containing HAP 17,[29][30][31]. Table 1.…”

Section: Resultsmentioning

confidence: 99%

The Immobilization of Soil Cadmium by the Combined Amendment of Bacteria and Hydroxyapatite

Zeng

et al. 2020

Sci Rep

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the remediation of heavy metal-contaminated soils has attracted increased attention worldwide. The immobilization of metals to prevent their uptake by plants is an efficient way to remediate contaminated soils. this work aimed to seek the immobilization of cadmium in contaminated soils via a combination method. Flask experiments were performed to investigate the effects of hydroxyapatite (HAp) and the Cupriavidus sp. strain ZSK on soil pH and DtpA-extractable cadmium. pot experiments were carried out to study the effects of the combined amendment on three plant species. The results showed that HAP has no obvious influence on the growth of the strain. With increasing concentrations of HAp, the soil pH increased, and the DtpA-extractable cd decreased. Via the combined amendment of the strain and HAP (SH), the DTPA-extractable Cd in the soil decreased by 58.2%. With the combined amendment of the SH, the cadmium accumulation in ramie, dandelion, and daisy decreased by 44.9%, 51.0%, and 38.7%, respectively. Moreover, the combined amendment somewhat benefitted the growth of the three plant species and significantly decreased the biosorption of cadmium. These results suggest that the immobilization by the SH combination is a potential method to decrease the available cadmium in the soil and the cadmium accumulation in plants. Soil is the main sink for metals and acts as a barrier to prevent their entry into the food chain 1. However, human activities such as mining and metal smelting have gradually transferred many toxic metals from the earth's crust to the environment, resulting in the spread and contamination of heavy metals 2-4. In recent decades, heavy metal pollution has become a serious problem worldwide. In China, it was reported that 13.33% of all soil samples collected from 6.3 million square kilometres of land were polluted with high levels of metals 5. Cadmium pollution has been detected in all agricultural areas. Cadmium is chemically stable and does not undergo chemical or microbial degradation. Moreover, cadmium is not an essential element for living organisms. Generally, it is regarded as the most toxic among heavy metals 6. Cadmium in the soil harms plant cells by altering metabolic pathways, damaging chloroplasts and mitochondria, and causing oxidative damage to lipids and proteins 7,8 , and cadmium also interferes with the uptake and transport of essential elements, e.g., P and K 9. Excessive Cd can reduce iron uptake by plants, affecting their photosynthesis 10. Cadmium can also accumulate in plants and animals and thus enters the human body through the food chain, threatening health 11,12. Thus, it is an enormous challenge to remediate heavy metal-contaminated soils worldwide. Various physical, chemical and biological techniques have been used to remediate heavy metal-contaminated soils 1. In situ immobilization is generally considered a feasible technique to remediate metal-contaminated soils due to its cost effectiveness and ease of operation 13. Many researchers have reported on the use of various...

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“…So far, most researcher have focused on adsorbing ions of heavy metals from aqueous solutions, while direct adsorption and immobilizing these elements in soil have remained understudied . Nevertheless, a few researches have been reported for immobilization of metal ions in soil using polymer based nanocomposites . Indeed, immobilizing or fixing heavy metals in the soil is crucial since these contaminants can enter the food cycle and affect the growth and life of plants, eventually increasing toxicity problems for living creatures.…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization, and Application of Polyacrylamide‐Polystyrene/Bentonite Nanocomposite as an Effective Immobilizing Adsorbent for Remediation of Soil

et al. 2020

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Heavy metals are among the most important environmental pollutants. However, little attention has been devoted to immobilizing or fixing metal ions in soil for remediation of soil. Here, a novel and inexpensive, polymer nanocomposite (polyacrylamide-polystyrene/bentonite) is introduced for successful immobilization of cadmium (Cd) and lead (Pb) cations in the soil. The synthesized nanocomposite structure was characterized by X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy/Energy-Dispersive X-Ray Spectroscopy (FE-SEM/EDX), Transmission Electron Microscopy (TEM), Brunauer-Emmett-Teller (BET), and Fourier-Transform Infrared Spectroscopy (FT-IR). Various effective parameters such as pH, bentonite: polyacrylamide weight ratio, heavy metal concen-tration, and amount of adsorbent were investigated for fixing Pb and Cd cations in farm soil. Also, adsorption isotherms and kinetics of adsorption were investigated. Finally, under optimum conditions, the extent of adsorption of Pb and Cd cations by polyacrylamide-polystyrene/bentonite nanocomposite, polyacrylamide, and bentonite was compared. The results revealed the superior adsorption activity of the nanocomposite for immobilizing heavy metal cations as compared to bentonite or polymer. Further, the nanocomposite indicated a reasonable reusability for fixing Cd and Pb cations. Overall, the prepared nanocomposite can be applied as a suitable and industrial adsorbent for immobilizing Pb and Cd cations in soil.

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Exploratory of immobilization remediation of hydroxyapatite (HAP) on lead-contaminated soils

Cited by 29 publications

References 32 publications

Effects of Soil Amendments on Heavy Metal Immobilization and Accumulation by Maize Grown in a Multiple-Metal-Contaminated Soil and Their Potential for Safe Crop Production

Effects of Soil Amendments on Heavy Metal Immobilization and Accumulation by Maize Grown in a Multiple-Metal-Contaminated Soil and Their Potential for Safe Crop Production

The Immobilization of Soil Cadmium by the Combined Amendment of Bacteria and Hydroxyapatite

Preparation, Characterization, and Application of Polyacrylamide‐Polystyrene/Bentonite Nanocomposite as an Effective Immobilizing Adsorbent for Remediation of Soil

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