Journal of Guangxi Normal University(Natural Science Edition) ›› 2021, Vol. 39 ›› Issue (3): 102-112.doi: 10.16088/j.issn.1001-6600.2020061103

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Adsorption of Cd(Ⅱ) and Cu(Ⅱ) from Aqueous Solutions by Polygonum Pubescens Blume Powder

DENG Hua1,2, LI Qiuyan1,2, ZHOU Ruishuang1,2, PANG Shuyue1,2, LIU Jinyu1,2, KANG Caiyan1,2*   

  1. 1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Guilin Guangxi 541006, China;
    2. College of Environment and Resources, Guangxi Normal University, Guilin Guangxi 541006, China
  • Received:2020-06-11 Revised:2020-08-15 Published:2021-05-13

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Abstract: In this paper, the effects of pH value, dosage, initial concentration, temperature and adsorption time on the adsorption of Cd(Ⅱ) and Cu(Ⅱ) by polygonum pubescens blume powder were studied by batch adsorption test with polygonum pubescens blume powder (hyperaccumulating manganese plant) as the research object. The adsorption mechanism was explored through kinetics, isothermal model fitting, FT-IR, SEM-EDS and XRD characterization analysis. The results showed that the optimum pH for adsorption of Cd(Ⅱ) and Cu(Ⅱ) by polygonum pubescens blume powder was 8 and 7, respectively, and the optimum dosage was 250 mg, and the adsorption equilibrium time was 60 min. The adsorption of Cd(Ⅱ) and Cu(Ⅱ) were in accordance with the quasi-second-order kinetic model. The adsorption of Cu(Ⅱ) was in accordance with Langmuir model, and the maximum theoretical adsorption capacity was 90.01 mg/g. The adsorption of Cd(Ⅱ) was in accordance with Freundlich model, and the maximum theoretical adsorption capacity was 62.69 mg/g. The adsorption thermodynamic analysis shows that the values of ΔG and ΔH are all negative, indicating that the adsorption process is spontaneous exothermic process. The results showed that the adsorption of Cd(Ⅱ) and Cu(Ⅱ) by polygonum pubescens blume powder were mainly carried out by hydrogen bonding, ion exchange and cation exchange-π interactions.

Key words: polygonum pubescens blume powder, cadmium, copper, adsorption, adsorption mechanism

CLC Number: 

  • X703
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