Qualitative and quantitative characterization of adsorption mechanisms for Cd2+ by silicon-rich biochar

Huang, Fei; Gao, Liyang; Wu, Renren; Wang, Heng; Xiao, Rongbo

doi:10.1016/j.scitotenv.2020.139163

Cited by 98 publications

(28 citation statements)

References 53 publications

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“…5) and SEM-EDS results (Fig. S1) also demonstrated that RSB was rich in K. Similar findings have been reported, suggesting the significance of ions exchange in Cd 2+ adsorption (Huang, et al 2020;Zhang, et al 2015).…”

Section: Discussionsupporting

confidence: 86%

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Different Response to Cd2+ Adsorption by Alkali-modified Biochars Derived From Soybean Straw and Rape Straw

Kang

Zhou

et al. 2021

Preprint

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Biochars have been modified by alkali (Ca(OH)2) to enhance Cd sorption capacity in aqueous solution. In this research, the alkali-modified (Ca) biochars were prepared by co-pyrolyzing lime (Ca(OH)2) and soybean straw (SBB) or rape straw (RSB) at 450 °C. The absorption mechanism was investigated by a series of experiments and was provided by quantitative analysis. The maximum adsorption capacities of Cd2+ by Ca-SBB and Ca-RSB were calculated to be 78.49 mg g−1 and 49.96 mg g−1, which were 1.56 and 1.48 times higher than SBB (50.40 mg g−1) and RSB (33.79 mg g−1), respectively. Compared with the original biochar (SBB, RSB), alkali-modified biochars (Ca-SBB and Ca-RSB) were found to have faster adsorption kinetics and lower desorption efficiencies. The mechanism study indicated that Ca(OH)2 modification effectively enhanced the contribution of ion exchange and decreased the contribution of functional groups complexation. After Ca(OH)2 modification, precipitation and ion exchange mechanisms dominated Cd2 + absorption on Ca-SBB, accounting for 49.85% and 34.94% of the total adsorption, respectively. Similarily ion exchange and precipitation were the main adsorption mechanism on Ca-RSB, accounting however for 61.91% and 18.47% of total adsorption, respectively. These results suggested that alkali-modified biochars have great potential in adsorbing cadmium in wastewater.

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Section: Discussionsupporting

confidence: 86%

“…Remarkably, ion-exchange has been reported to contribute up to 79.5% of Cd sorption by hyacinth biochar (Zhang, et al 2015) and up to 44.49% by rice-husk biochars (Huang, et al 2020).…”

Section: Discussionmentioning

confidence: 99%

Different Response to Cd2+ Adsorption by Alkali-modified Biochars Derived From Soybean Straw and Rape Straw

Kang

Zhou

et al. 2021

Preprint

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“…The loss was probably due to the formation of trace silica scale sticking to the wall of crucible during the production of alkali-enhanced biochar. Similar trend of lower total Si content was also observed when biochar pyrolysis temperature increased from 300 to 700 °C (Huang et al 2020). Non-enhanced biochar (0B) samples showed the higher 5dSCAN-Si content at 350 °C pyrolysis temperature, and it had lower extractable Si as pyrolysis temperature was increased to 550 °C (Fig.…”

Section: Effect Of Pyrolysis Temperature and Alkali Treatment On Biochar Phytolith-si Releasesupporting

confidence: 73%

“…Pyrolysis temperature has been considered as one of the most important factors affecting physical, chemical and structural characteristics of biochar (Singh et al 2012;Keiluweit et al 2010;Nguyen et al 2010;Kuzyakov et al 2009). Compared with biochars prepared at low temperatures, high-pyrolysis temperature biochars tend to have higher carbon content, pH, ash content, specific surface area, aromatization and thermal stability, but exhibit lower nitrogen content, yield, and aliphatic carbon fractions (Huang et al 2020;Suliman et al 2016;Ahmad et al 2012;Kim et al 2012;Novak et al 2009). Pyrolysis temperature also affects the interaction of carbon with silicon in biochar.…”

Section: Introductionmentioning

confidence: 99%

Effect of pyrolysis temperature on Si release of alkali-enhanced Si-rich biochar and plant response

Wang

Tafti

Wang

et al. 2021

Biochar

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Recent studies have shown that silicon (Si) dissolution from biochar may be influenced by the pyrolysis temperature. In addition, the enhancement of biochar by treatment with alkali has been proposed to produce a Si source that can be used for environmentally friendly plant disease control. In this study, biochars from rice straw and rice husk pretreated with KOH, CaO and K2CO3 and then pyrolyzed at 350, 450 and 550 °C were prepared to evaluate the effects of pyrolysis temperature on Si release and plant uptake from alkali-enhanced Si-rich biochar. Extractable Si and dissolution Si from the prepared biochars were assessed by different short-term chemical methods and long-term (30-day) release in dilute acid and neutral salt solutions, respectively, along with a rice potting experiment in greenhouse. For both rice straw- and husk-derived alkali-enhanced biochars (RS-10KB and HS-10K2B, respectively), increasing the pyrolysis temperature from 350 to 550 °C generally had the highest extractable Si and increased Si content extracted by 5-day sodium carbonate and ammonium nitrate (5dSCAN) designated for fertilizer Si by 61–142%, whereas non-enhanced biochars had more extractable Si at 350 °C. The alkali-enhanced biochars produced at 550 °C pyrolysis temperature also released 82–172% and 27–79% more Si than that of 350 °C produced biochar in unbuffered weak acid and neutral salt solutions, respectively, over 30 days. In addition, alkali-enhanced biochars, especially that derived from rice husk at 550 °C facilitated 6–21% greater Si uptake by rice and 44–101% higher rice grain yields than lower temperature biochars, non-enhanced biochars, or conventional Si fertilizers (wollastonite and silicate calcium slag). Overall, this study demonstrated that 550 °C is more efficient than lower pyrolysis temperature for preparing alkali-enhanced biochar to improve Si release for plant growth.

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“…The immobilized pellet is composed of growing microorganism and supporting matrix, during which actively growing cells could remove metal ions either by active adsorption onto cell surface or sequestration in cell cytoplasm (intracellular accumulation), whereas magnetic biochar could only remove heavy metals by passive adsorption. Speci cally speaking, the overall biosorption mechanisms responsible for the Cd 2+ removal include : (i) physical adsorption of Cd 2+ was resulted from the electrostatic and van der Waals interactions (Sohbatzadeh et al, 2017) (Huang et al, 2020a). Owing to the coincidence of these mechanisms in bacteria and biochar (active or passive adsorption), it is impossible to determine whether involved mechanisms are derived from microbial cell or biochar matrix.…”

Section: Introductionmentioning

confidence: 99%

Enhanced cadmium removal by growing Bacillus cereus RC-1 immobilized on different magnetic biochars through simultaneous adsorption and bioaccumulation

Deng¹,

Yan

et al. 2021

Preprint

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Biosorption of cadmium by growing bacteria immobilized on the three magnetic biochars derived from rice straw (MRSB-pellet), sewage sludge (MSSB-pellet), and chicken manure (MCMB-pellet) was investigated, respectively. Total biosorption capacity of the pellets was tested under varying range of pH, culture time, and initial Cd 2+ concentration. The maximum biosorption capacity of 93.02 mg/g was obtained with MRSB-pellet, followed by MSSB-pellet (68.02 mg/g) and MCMB-pellet (63.95 mg/g). The biosorption by these immobilized bacterial pellets was more effective than free bacteria, this enhancement could be the result of simultaneous adsorption and bioaccumulation, mainly resulting from magnetic biochar carrier and active bacteria, respectively. The biosorption process by immobilized pellets was primarily driven by ion-exchange and complexation, which jointly contributed of 73.56% (MRSB-pellet) to 78.62% (MSSB-pellet) the total adsorption, while the mechanisms of chemical precipitation and physical adsorption could averagely contribute 6.91% (MSSB-pellet) and 11.24% (MRSB-pellet), respectively. Intracellular accumulation was comparably tiny among these mechanisms accounting for 4.30-5.92% of total biosorption, in turn, it would maintain intracellular Cd 2+ concentration below a toxic threshold to promote cell growth. These suggested that magnetic biochar immobilized bacteria, particularly MRSB-pellet could be used as an effective biosorbent to remove the Cd 2+ from the growth medium. This study further deepened our understanding of biosorption process by microorganism immobilized onto magnetic biochar for the metals removal.

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Qualitative and quantitative characterization of adsorption mechanisms for Cd2+ by silicon-rich biochar

Cited by 98 publications

References 53 publications

Different Response to Cd2+ Adsorption by Alkali-modified Biochars Derived From Soybean Straw and Rape Straw

Different Response to Cd2+ Adsorption by Alkali-modified Biochars Derived From Soybean Straw and Rape Straw

Effect of pyrolysis temperature on Si release of alkali-enhanced Si-rich biochar and plant response

Enhanced cadmium removal by growing Bacillus cereus RC-1 immobilized on different magnetic biochars through simultaneous adsorption and bioaccumulation

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