Effect of sulfur-iron modified biochar on the available cadmium and bacterial community structure in contaminated soils

Wu, Chuan; Shi, Lizheng; Xue, Rui; Li, Wai Chin; Jiang, Xingxing; Rajendran, Manikandan; Zhang, Qian

doi:10.1016/j.scitotenv.2018.08.087

Cited by 230 publications

(44 citation statements)

References 82 publications

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“…The lamellar stack structure is obvious with an obvious pore structure. As proposed by Wu et al [30] also, after modification, the granular and block structure of TSBC-600 and TMBC-600 increased, presumably due to the introduction of sulfur-containing groups that increased the number of biochar particles and the surface became smooth. Part of the pore structure was blocked, the impurities on the biochar surface reduced, and the outline of the structure was clear.…”

Section: Effects Of Modification On the Physicochemical Properties Ofmentioning

confidence: 59%

“…The absorption peak at 2901 cm −1 was assigned to the stretching vibration of -CH 2 or -CH [33]. The characteristic peak appearing at 2358 cm −1 after modification may be caused by the stretching vibration of the -C≡N triple bond, and the two strong absorption peaks, i.e., 1066 cm −1 and 1244 cm −1 appearing in the frequency band of 1050-1250 cm −1 are the stretching vibration absorption peaks of C-S and C=S [30], respectively, indicating the presence of sulfurization during the modification of biochar. The characteristic absorption peak at 1439 cm −1 is attributed to the stretching vibration of C-N [34], and the absorption peak at 1585 cm −1 may be the absorption characteristic peak of C=N or C=O [14].…”

Section: Effects Of Modification On Functional Groups On the Biochar mentioning

confidence: 99%

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Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Zhu

Liang

et al. 2020

Water

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Removal of aquatic cadmium ions using biochar is a low-cost method, but the results are usually not satisfactory. Modified biochar, which can be a low-cost and efficient material, is urgently required for Cd-polluted water and soil remediation. Herein, poplar bark (SB) and poplar sawdust (MB) were used as raw materials to prepare modified biochar, which is rich in N- and S- containing groups, i.e., TSBC-600 and TMBC-600, using a co-pyrolysis method with thiourea. The adsorption characteristics of Cd2+ in simulated wastewater were explored. The results indicated that the modification optimized the surface structure of biochar, Cd2+ adsorption process by both TSBC-600 and TMBC-600 was mainly influenced by the initial pH, biochar dosage, and contact time, sthe TSBC-600 showed a higher adsorption capacity compared to TMBC-600 under different conditions. The Langmuir adsorption isotherm model and pseudo-second-order kinetic model were more consistent with the adsorption behavior of TSBC-600 and TMBC-600 to Cd2+, the maximum adsorption capacity of TSBC-600 and TMBC-600 calculated by the Langmuir adsorption isotherm model was 19.998 mg/g and 9.631 mg/g, respectively. The modification method for introducing N and S into biochar by the co-pyrolysis of biomass and thiourea enhanced the removal rate of aquatic cadmium ions by biochar.

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Section: Effects Of Modification On the Physicochemical Properties Ofmentioning

confidence: 59%

Section: Effects Of Modification On Functional Groups On the Biochar mentioning

confidence: 99%

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Zhu

Liang

et al. 2020

Water

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“…Also, the increase in both soil pH and buffer capacity may further improve Cd uptake [ 15 ]. It was reported that increased pH increases the density of negative charges in soil, as well as the density of negative charges in biochar particles causing Cd immobilization [ 6 , 48 ]. In addition, the ash in biochar may induce the coprecipitation of Cd with anions and cations, such as Ca 2+ , Mg 2+ , and (PO 4 ) 3- [ 7 ].…”

Section: Discussionmentioning

confidence: 99%

“…In humans, long-term intake of rice with Cd content over 0.2 mg·kg −1 may cause irreversible liver dysfunction, cartilage disease, and kidney damage [ 4 ]. Cd in crops inhibits plant respiration, photosynthesis, mineral uptake, and transpiration, significantly reducing crop yield [ 5 ] and affecting food quality [ 6 ]. Due to the rapid industrialization in China during the last 40 years, soil pollution with Cd significantly increased throughout China [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Remediation of Soil Polluted with Cd in a Postmining Area Using Thiourea-Modified Biochar

Zhu

Chen

et al. 2020

IJERPH

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Cadmium presence in soil is considered a significant threat to human health. Biochar is recognized as an effective method to immobilize Cd ions in different soils. However, obtaining effective and viable biochar to remove elevated Cd from postmining soil remains a challenge. More modifiers need to be explored to improve biochar remediation capacity. In this investigation, pot experiments were conducted to study the effects of poplar-bark biochar (PBC600) and thiourea-modified poplar-bark biochar (TPBC600) on Cd speciation and availability, as well as on soil properties. Our results showed that the addition of biochar had a significant influence on soil properties. In the presence of TPBC600, the acid-soluble and reducible Cd fractions were transformed into oxidizable and residual Cd fractions. This process effectively reduced Cd bioavailability in the soil system. Compared to PBC600, TPBC600 was more effective in improving soil pH, electrical conductivity (EC), organic matter (SOM), total nitrogen (TN), ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3--N), available potassium (AK), available phosphorus (AP), and available sulfur (AS). However, this improvement diminished as incubation time increased. Results of Pearson correlation analysis, multivariate linear regression analysis, and principal component analysis showed that soil pH and available phosphorus played key roles in reducing the available cadmium in soil. Therefore, TPBC600 was shown to be an effective modifier that could be used in the remediation of soil polluted with Cd.

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“…Determination of the speciation of soil Cd. The determination of the speciation of soil Cd was performed by a modified sequential extraction procedure 29,30 . Five Cd species, including exchangeable, bound to carbonates, bound to Fe and Mn oxides, bound to organic matter, and residual, were determined.…”

Section: Germination Test Preparation Of Particle Suspensions and Camentioning

confidence: 99%

The effectiveness of nanobiochar for reducing phytotoxicity and improving soil remediation in cadmium-contaminated soil

Liu

et al. 2020

Sci Rep

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There is growing concern that Cd in soils can be transferred to plants, resulting in phytotoxicity and threats to human health via the food chain. Biochar has been reported to be a soil amendment capable of reducing the bioavailability of metals in soil by electrostatic interactions, ionic exchange and the specific binding of metal ions by surface ligands. To determine the effects of Cd contamination and nanobiochar on the growth characteristics of plants, the dynamics of Cd in soil were explored in Petri dish and pot experiments (0%, 0.2%, 0.5% and 1% nanobiochar), respectively. The diversity, distribution and composition of the bacterial community in treated soil were monitored by high-throughput sequencing. The results showed that the germination potential and height and weight of plants were significantly decreased in Cd-treated soil samples (P < 0.05). The Cd content of Brassica chinensis L. in the treated soil groups was lower than that in the untreated soil groups (P < 0.05) after nanobiochar application. The application of biochar significantly improved the microbial biomass, microorganism abundance and diversity of Actinobacteria and Bacteroidetes in Cd-contaminated soil and reduced the diversity of Proteobacteria, which was relatively more persistent than in the contaminated sites without biochar application. The results of this study provide theoretical and technical support for understanding the environmental behavior of nanopassivators, thus enhancing the role of biochar in the remediation of soil pollution.

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Effect of sulfur-iron modified biochar on the available cadmium and bacterial community structure in contaminated soils

Cited by 230 publications

References 82 publications

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Remediation of Soil Polluted with Cd in a Postmining Area Using Thiourea-Modified Biochar

The effectiveness of nanobiochar for reducing phytotoxicity and improving soil remediation in cadmium-contaminated soil

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