Stabilization and passivation of multiple heavy metals in soil facilitating by pinecone-based biochar: Mechanisms and microbial community evolution

Lan, Jirong; Zhang, Shanshan; Dong, Yiqie; Li, Jiahao; Li, Shiyao; Liu, Feng; Hou, Haobo

doi:10.1016/j.jhazmat.2021.126588

Cited by 72 publications

(16 citation statements)

References 44 publications

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“…Various functional groups identified on biochar surface through SEM analysis also support the possibility of surface complexation of metals with the organic functional groups, rendering the heavy metals immobile in the form of organo-metal complexes (Al-Wabel et al, 2017;Mehmood et al, 2018;Qi et al, 2018). It was also found that the addition of biochar has a significant effect in increasing the soil microbial community that can aid in the stabilization and passivation of the metals through the inorganic ion transport mechanism (Lan et al, 2021). Frontiers in Environmental Science frontiersin.org…”

Section: Heavy Metalsmentioning

confidence: 80%

Employment of Cannabis sativa biochar to improve soil nutrient pool and metal immobilization

Anjum

Qi²,

Riaz³

et al. 2022

Front. Environ. Sci.

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Soil pollution with heavy metals has become a global issue because of anthropogenic activities causing gradual loss of soil nutrients and fertility, thus, reducing agricultural production. Biochar is recommended as an organic and environment-friendly option to address the issue of nutrient deficiency and heavy metal pollution. The present study was performed with biochar derived from Cannabis sativa to surplus soil nutrient pool and heavy metal immobilization. The characterization through scanning electron microscopy (SEM) revealed that biochar was brittle, porous, alkaline, and labile in nature. The elemental composition of biochar was carbon (75.3%), oxygen (19.2%), calcium (3.9%), potassium (1.5%), and chlorine (0.08%) determined by energy dispersive X-ray spectroscopy. Fourier transform infrared (FTIR) spectroscopy revealed the occurrence of carbonyl group, phenols, and alcohols in biochar derived from Cannabis sativa. The soil was spiked with lead and cadmium salt solution (25 ppm and 250) and incubated for 30 days. It was found that biochar amendments (1% = BC1 and 5% = BC5) significantly (p < 0.05) increased the soil physicochemical properties such as pH, electrical conductivity (EC), oxidizable organic carbon (OC), total organic carbon (TOC), and organic matter (OM). In the case of BC5, OC increased by 189.86%, TOC increased by 189.13%, and OM increased by 188.68%, as compared to the control. Similarly, soil available nitrogen (AN) and soil available phosphorous improved by 233.3% and 101.79%, respectively, compared to control. On the other hand, BC1 showed a significant reduction (p < 0.05) in lead and cadmium concentrations by 45.74% and 56.58%, respectively, in comparison to BC5 and control. In conclusion, we suggest that Cannabis sativa biochar may serve as an effective treatment for enhancing soil fertility and remediation of soil polluted with heavy metals.

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Section: Heavy Metalsmentioning

confidence: 80%

Employment of Cannabis sativa biochar to improve soil nutrient pool and metal immobilization

Anjum

Qi²,

Riaz³

et al. 2022

Front. Environ. Sci.

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“…e initial parameters of all models are set the same, and the specific settings are as follows: e maximum number of training rounds is 5000; the number of training samples in each round is 64; the random seed is 1; the maximum memory size is 500; the initial state of agent is [2,14]; the difference of training rounds between weight updates of Q network is 200; the learning rate of convolutional neural network is 0.001; the probability factor of e-greedy algorithm is 0.9. As can be seen, the abscissa is the number of training rounds, and the ordinate is the error between predicted value and observed value (mg/kg).…”

Section: Parameter Settingmentioning

confidence: 99%

“…Lan et al used pinealone-biochar to stably passivate Pb, Cu, Zn, Cr, and As in soil. As can be seen, the addition of pinealonebiochar and the coexistence of indigenous microorganisms can effectively reduce biological activity of heavy metals and accelerate passivation of heavy metals [2]. Khan Imran and Yang Dong et al found that silicon in soil has a certain detoxification mechanism for heavy metals, which provides a certain theoretical basis for reducing toxicity of heavy metals in soil [3,4].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Soil Heavy Metal Content Based on Deep Reinforcement Learning

Zhao

Wei

Wen³

2022

Scientific Programming

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Since the prediction accuracy of heavy metal content in soil by common spatial prediction algorithms is not ideal, a prediction model based on the improved deep Q network is proposed. The state value reuse is used to accelerate the learning speed of training samples for agents in deep Q network, and the convergence speed of model is improved. At the same time, adaptive fuzzy membership factor is introduced to change the sensitivity of agent to environmental feedback value in different training periods and improve the stability of the model after convergence. Finally, an adaptive inverse distance interpolation method is adopted to predict observed values of interpolation points, which improves the prediction accuracy of the model. The simulation results show that, compared with random forest regression model (RFR) and inverse distance weighted prediction model (IDW), the prediction accuracy of soil heavy metal content of proposed model is higher by 13.03% and 7.47%, respectively.

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“…Microbial application in metal-contaminated soil to avoid soil/plant toxicity has been reported as a viable approach as almost 60–80% of heavy metals are removed by bacterial species (Wei et al, 2020 ). However, Lan et al ( 2021 ) reported that the efficiency of bacteria in detoxifying the Cr 6+ , Pb 2+ , Zn 2+ , and Cu 2+ stress could be enhanced when applied in combination with pinecone-based biochar. A study by Li et al ( 2022 ) investigated that availability of HMs (Pb, Cd, and Zn) can be effectively reduced (Pb: 51.25%, Cd: 26.25%, and Zn: 34.25%) by the coexistence of bacterial species ( Pseudomonas, Bacillus, Lysobacter , and Brevundimonas ), Zn-doped biochar, and carbon aerogel nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Comparative efficiency of silica gel, biochar, and plant growth promoting bacteria on Cr and Pb availability to Solanum melongena L. in contaminated soil irrigated with wastewater

et al. 2022

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Crop irrigation with untreated wastewater is a routine practice in developing countries that causes multiple human health consequences. A comparative study was performed to regulate total Cr and Pb stress in soil and Solanum melongena L. plant. For this purpose, 0.2% chitosan polymerized silica gel (CP-silica gel), 1.5% zinc-enriched biochar (ZnBc), and three bacterial species such as Trichococcus sp. (B1), Pseudomonas alcaligenes (B2), and Bacillus subtilis (B3) were selected. Initially, a biosorption trial was conducted to test the heavy metal removal efficiency of three bacterial species B1, B2, and B3 for 24 h. Hence, B3 showed maximum Cr and Pb removal efficiency among the studied bacterial isolates. Then, a pot study was conducted with 12 different treatments having three replicates. After harvesting, different growth and biochemical parameters such as chlorophyll concentration, proteins, phenolics, reactive oxygen species, and antioxidant enzymes were analyzed. The results demonstrated that wastewater application significantly (p ≤ 0.01) reduced the fresh and dry weights of the root, stem, and leaves due to high total Cr and Pb toxicity. However, CP-silica gel and ZnBc treatments performed best when applied in combination with B3. The concentration of leaf total Cr was significantly decreased (91 and 85%) with the application of ZnBc + B3 and CP-Silica gel + B3, respectively, as compared to control. There was a reduction in stem hydrogen peroxide (87%) and malondialdehyde (81%) recorded with CP-silica gel + B3 treatment due to enhanced activities of antioxidant enzymes viz. ascorbate peroxidase (6-folds) and catalase (7-folds) relative to control. Similarly, leaf total phenolics (3-folds) and protein (6-folds) contents were enhanced with CP silica gel+B3 application relative to control. Overall, CP-silica gel and ZnBc with B3 application proved to be the most appropriate treatments and can be used in developing countries to limit the deleterious effects of total Cr and Pb pollution.

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Stabilization and passivation of multiple heavy metals in soil facilitating by pinecone-based biochar: Mechanisms and microbial community evolution

Cited by 72 publications

References 44 publications

Employment of Cannabis sativa biochar to improve soil nutrient pool and metal immobilization

Employment of Cannabis sativa biochar to improve soil nutrient pool and metal immobilization

Prediction of Soil Heavy Metal Content Based on Deep Reinforcement Learning

Comparative efficiency of silica gel, biochar, and plant growth promoting bacteria on Cr and Pb availability to Solanum melongena L. in contaminated soil irrigated with wastewater

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