Details

Autor(en) / Beteiligte

• Wang, Yin-fei
• Li, Wen-bin
• Deng, Hong-yan
• Zhu, Lang
• Li, Jun-qi
• Guo, Meng-ting
• Liu, Zhi-feng

Titel

Effect mechanism of litter extract from Alternanthera philoxeroides on the selective absorption of heavy metal ions by amphoteric purple soil

Ist Teil von

• Journal of environmental management, 2022-11, Vol.321, p.115970-115970, Article 115970

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2022

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Plant litter causes a serious waste of resources. Thus, plant litter extract (LE) should be used in the soil remediation of heavy metals. In this study, different proportions of LE from the Alternanthera philoxeroides were used to modify dodecyl dimethyl betaine (BS)-modified purple soil (P). The basic physicochemical properties of LE + BS-modified Ps (LE + BS-Ps) were determined, and the microscopic morphology of LE + BS-Ps was studied by using scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), Fourier transform infrared (FTIR) spectroscopy, and specific surface area detection. The isothermal adsorption characteristics of heavy metal ions (Pb2+, Cu2+, and Cr6+) on different LE + BS-Ps were investigated by the batch method, and the effect mechanisms of temperature, pH, ionic strength, and LE + BS-P's property were compared. Results showed that the cation exchange capacity and specific surface area of LE + BS-Ps increased, pH of LE + BS-Ps decreased, and TOC of LE + BS-Ps increased first and then decreased with increasing proportion of LE. FTIR, SEM, and EDS results proved that LE was modified on the surface of BS-P. Langmuir and Freundlich models could be used to describe the adsorption isotherms of heavy metal ions on different LE + BS-Ps, and the fitting correlation of the Langmuir model was higher than that of the Freundlich model. The maximum adsorption capacity (qm) of Pb2+, Cu2+, and Cr6+ were 107.60–295.66, 133.00–342.11, and 33.59–75.41 mmol/kg, respectively. The qm of Pb2+, Cu2+, and Cr6+ on LE + BS-Ps all increased first and then decreased with increasing proportion of LE, and the peak value was observed in 20%LE + BS-Ps. High pH improved Pb2+ and Cu2+ adsorption but inhibited Cr6+ adsorption. The adsorption amounts of Pb2+, Cu2+, and Cr6+ all increased first and then decreased with incresing ionic strength and were maintained at the maximum value of 0.1–0.2 mol/L. The Pb2+, Cu2+, and Cr6+ adsorption mechanisms on different LE + BS-Ps showed a positive temperature effect and presented spontaneous, exothermic and entropy-adding processes. •The order of maximum adsorption capacity on different LE + BS-Ps is Cu2+ > Pb2+ > Cr6+.•High pH improves Pb2+ and Cu2+ adsorption but inhibits Cr6+ adsorption on LE+BS-Ps.•The adsorption amounts of metal ion show the maximum value at 0.1–0.2 mol/L.•Metal ion adsorption on different LE + BS-Ps present a positive temperature effect.•Complexation plays a key role in heavy metal adsorption by different LE + BS-Ps.