Remediation of Cd2+ in aqueous systems by alkali-modified (Ca) biochar and quantitative analysis of its mechanism

Wang, Jingbo; Kang, Yaxin; Duan, Huatai; Zhou, Yi; Li, Hao; Shan-guo, Chen; Tian, Fenghua; Li, Lianqing; Δρόσος, Μάριος; Dong, Chunyan; Joseph, Stephen; Pan, Genxing

doi:10.1016/j.arabjc.2022.103750

Cited by 14 publications

(6 citation statements)

References 35 publications

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“…The results of the FTIR spectra of CaAl-LDH/BC are shown in Figure 1 b. The characteristic peaks at 875.01 cm −1 and 525.36 cm −1 correspond to Ca-O and Al-O groups, respectively, which further confirmed the loading of CaAl-LDH onto the surface of BC [ 31 , 32 ]. Moreover, compared to BC, CaAl-LDH/BC corresponds to a smaller hydroxyl characteristic peak area near 3422.59 cm −1 , which is a result of the loading of the CaAl-LDH leading to the weakening of the reducing functional groups of the material [ 33 ].…”

Section: Resultsmentioning

confidence: 84%

CaAl-Layered Double Hydroxides-Modified Biochar Composites Mitigate the Toxic Effects of Cu and Pb in Soil on Pea Seedlings

Wang,

Cai,

et al. 2024

Materials

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Compound contamination of soil with heavy metals copper (Cu) and lead (Pb) triggered by mining development has become a serious problem. To solve this problem, in this paper, corncob kernel, which is widely available and inexpensive, was used as the raw material of biochar and modified by loading CaAl-layered double hydroxides to synthesize biochar-loaded CaAl-layered double hydroxide composites (CaAl-LDH/BC). After soil remediation experiments, either BC or CaAl-LDH/BC can increase soil pH, and the available phosphorus content and available potassium content in soil. Compared with BC, CaAl-LDH/BC significantly reduced the available content of Cu and Pb in the active state (diethylenetriaminepentaacetic acid extractable state) in the soil, and the passivation rate of Cu and Pb by a 2% dosage of CaAl-LDH/BC reached 47.85% and 37.9%, respectively. CaAl-LDH/BC can significantly enhance the relative abundance of beneficial microorganisms such as Actinobacteriota, Gemmatimonadota, and Luteimonas in the soil, which can help to enhance the tolerance and reduce the enrichment ability of plants to heavy metals. In addition, it was demonstrated by pea seedling (Pisum sativum L.) growing experiments that CaAl-LDH/BC increased plant fresh weight, root length, plant height, catalase (CAT) activity, and protein content, which promoted the growth of the plant. Compared with BC, CaAl-LDH/BC significantly reduced the Cu and Pb contents in pea seedlings, in which the Cu and Pb contents in pea seedlings were reduced from 31.97 mg/kg and 74.40 mg/kg to 2.92 mg/kg and 6.67 mg/kg, respectively, after a 2% dosage of CaAl-LDH/BC, which was a reduction of 90.84% and 91.03%, respectively. In conclusion, compared with BC, CaAl-LDH/BC improved soil fertility and thus the plant growth environment, and also more effectively reduced the mobility of heavy metals Cu and Pb in the soil to reduce the enrichment of Cu and Pb by plants.

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Section: Resultsmentioning

confidence: 84%

CaAl-Layered Double Hydroxides-Modified Biochar Composites Mitigate the Toxic Effects of Cu and Pb in Soil on Pea Seedlings

Wang,

Cai,

et al. 2024

Materials

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“…Generally, pristine biochar has a poor adsorption capacity for HMs owing to the constraints related to the surface structure. Therefore, a variety of surface modification approaches, such as acid/alkali modification (Wang et al 2022), and loading with metal oxides (Feng et al 2020), minerals (Wang et al 2015), and nano-particles (Yan et al 2015), have been used to enhance the adsorption capabilities of biochar. In the past decade, the loading of FeO x /MnO x particles onto biochar surfaces has attracted considerable attention as it effectively increases its adsorption capacity for HM ions by promoting the creation of numerous functional groups and improving pore structures (Wang et al 2018;Xiao et al 2020).…”

Section: Graphical Abstractmentioning

confidence: 99%

High-efficiency remediation of Hg and Cd co-contaminated paddy soils by Fe–Mn oxide modified biochar and its microbial community responses

Sun,

Gao,

Yang

et al. 2024

Biochar

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Fe–Mn oxide modified biochar (FMBC) was produced to explore its potential for remediation of Hg–Cd contaminated paddy soils. The results showed that the application of FMBC decreased the contents of bioavailable Hg and Cd by 41.49–81.85% and 19.47–33.02% in contrast to CK, while the amount of labile organic carbon (C) fractions and C-pool management index (CPMI) was increased under BC and FMBC treated soils, indicating the enhancement of soil C storage and nutrient cycling function. Dry weight of different parts of Oryza sativa L. was enhanced after the addition of BC and FMBC, and the contents of Fe and Mn in root iron–manganese plaques (IMP) were 1.46–2.06 and 6.72–19.35 times higher than those of the control groups. Hg and Cd contents in brown rice under the FMBC treatments were significantly reduced by 18.32–71.16% and 59.52–72.11% compared with the control. FMBC addition altered the composition and metabolism function of soil bacterial communities, especially increasing the abundance of keystone phyla, including Firmicutes, Proteobacteria and Actinobacteria. Partial least squares path modelling (PLSPM) revealed that the contents of Na2S2O3–Hg, DTPA–Cd and IMP were the key indicators affecting Hg and Cd accumulation in rice grains. These results demonstrate the simultaneous value of FMBC in remediation of Hg and Cd combined pollution and restoring soil fertility and biological productivity. Graphical Abstract

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“…After modification with calcium hydroxide and sodium hydroxide, the intensities of the peaks decreased, indicating the dissolution of SiO 2 under alkaline conditions, consistent with the EDX results. Notably, the peaks of Na-CSB were mainly associated with thermonatrite (Na 2 CO 3 •H 2 O) at 16.9 The formation of these carbonate crystal peaks was primarily attributed to the oxidation of C to CO 2 , which further interacted with sodium hydroxide and calcium hydroxide to generate Na 2 CO 3 and CaCO 3 , respectively [22,23]. CaCO 3 can release Ca 2+ when dissolved under acidic conditions [41], thereby forming complexes with TC, which partly explains the enhanced adsorption capacity of Ca-CSB for TC under acidic conditions [42].…”

Section: Adsorption Mechanismmentioning

confidence: 99%

“…Currently, the modification of biochar using calcium hydroxide has gained attention as it allows for direct mixing with biomass during pyrolysis at low temperatures to produce biochar [22][23][24][25]. Nevertheless, calcium hydroxide-modified biochar is primarily employed to recover phosphorus from environmental matrices, and a limited number of reports are available on its use for contaminant remediation purposes [22,23]. Utilising agricultural and forestry wastes as biomass to remove contaminants offers an environment-friendly approach [10,26].…”

Section: Introductionmentioning

confidence: 99%

Tetracycline Adsorption Performance and Mechanism Using Calcium Hydroxide-Modified Biochars

Wang,

Yao,

Zhang

et al. 2023

Toxics

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Tetracycline is frequently found in various environments and poses significant ecological risks. Calcium hydroxide-modified biochar has shown potential as a material for removing multiple classes of pollutants from wastewater streams. The tetracycline-adsorption performance and mechanism of alkali-modified biochars derived from nine wastes (corn straw, rice straw, swine manure, cypress powder, wheat straw, peanut shell, walnut shell powder, soybean straw, and corncobs) were investigated in the study. Among the four alkalis tested, calcium hydroxide exhibited the most effective modification effects at a pyrolysis temperature of 500 °C. Straw biomass was most suitable to be modified by calcium hydroxide, and calcium hydroxide-modified biochar showed the highest adsorption performance for tetracycline. The maximum adsorption capacities were 8.22 mg g−1 for pristine corn straw biochar and 93.46 mg g−1 for calcium hydroxide-modified corn straw biochar. The tetracycline adsorption mechanism by calcium hydroxide-modified corn straw biochar involved hydrogen bonding, oxygen-containing functional groups, Ca2+ metal complexation, and electrostatic attraction. Consequently, calcium hydroxide-modified corn straw biochar emerges as an environment-friendly, cost-effective, and efficient tetracycline adsorbent.

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Remediation of Cd2+ in aqueous systems by alkali-modified (Ca) biochar and quantitative analysis of its mechanism

Cited by 14 publications

References 35 publications

CaAl-Layered Double Hydroxides-Modified Biochar Composites Mitigate the Toxic Effects of Cu and Pb in Soil on Pea Seedlings

CaAl-Layered Double Hydroxides-Modified Biochar Composites Mitigate the Toxic Effects of Cu and Pb in Soil on Pea Seedlings

High-efficiency remediation of Hg and Cd co-contaminated paddy soils by Fe–Mn oxide modified biochar and its microbial community responses

Tetracycline Adsorption Performance and Mechanism Using Calcium Hydroxide-Modified Biochars

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