Adsorption behavior of lead, cadmium, and arsenic on manganese-modified biochar: competition and promotion

Zeng, Gai; Si, Mengying; Dong, Chunhua; Liao, Qi; He, Fangshu; Johnson, Varney Edwin; Arinzechi, Chukwuma; Yang, Weichun; Yang, Zhihui

doi:10.1007/s10653-024-01865-z

Cited by 5 publications

(2 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When P exceeds 1.0, it indicates a synergistic effect between Pb(II) and Cd(II). A p -value of 0 signifies that there is no interaction between Pb(II) and Cd(II), while a p -value less than 1.0 signals a competitive interaction between the two metals [ 4 , 48 ].

where P represents the interaction factor; Q max, binary (mg/g) represents the maximum adsorption capacity when both Pb(II) and Cd(II) are adsorbed simultaneously; and Q max, single (mg/g) refers to the maximum adsorption capacity when either Pb(II) or Cd(II) is adsorbed individually.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Conversion of Phosphogypsum into Porous Calcium Silicate Hydrate for the Removal and Recycling of Pb(II) and Cd(II) from Wastewater

Wang,

Chen,

et al. 2024

Molecules

View full text Add to dashboard Cite

The discharge of lead and cadmium wastewater, along with the pollution caused by phosphogypsum, represents a particularly urgent environmental issue. This study employed a straightforward hydrothermal method to convert phosphogypsum into porous calcium silicate hydrate (P-CSH), which was then used to remove and recover Pb(II) and Cd(II) from wastewater. The adsorption capacities of P-CSH for Pb(II) and Cd(II) were notably high at 989.3 mg/g and 290.3 mg/g, respectively. The adsorption processes adhered to the pseudo-second-order kinetics model and the Langmuir isotherm model. Due to identical adsorption sites on P-CSH for both Pb(II) and Cd(II), competitive interaction occurred when both ions were present simultaneously. Additionally, the adsorption efficacy was minimally impacted by the presence of common coexisting cations in wastewater. The dominant mechanisms for removing Pb(II) and Cd(II) via P-CSH were chemical precipitation and surface complexation. Moreover, the adsorbed heavy metals were efficiently separated and reclaimed from the wastewater through a stepwise desorption process. The primary components of the residue from stepwise desorption were quartz and amorphous SiO2. Following dissolution via pressurized alkaline leaching, this residue could be recycled for synthesizing P-CSH. This research offered a new strategy for the resourceful use of phosphogypsum and heavy metal wastewater.

show abstract

Section: Resultsmentioning

confidence: 99%

“…When P exceeds 1.0, it indicates a synergistic effect between Pb(II) and Cd(II). A p-value of 0 signifies that there is no interaction between Pb(II) and Cd(II), while a p-value less than 1.0 signals a competitive interaction between the two metals [4,48].…”

Section: Competitive or Cooperative Adsorptionmentioning

confidence: 99%