SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 46 ›› Issue (6): 150-160.DOI: 10.1016/j.cjche.2021.03.029

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Synergistic effects of phosphoric acid modified hydrochar and coal gangue-based zeolite on bioavailability and accumulation of cadmium and lead in contaminated soil

Qilong Ge1,2, Qi Tian1,3, Sufang Wang1, Fang Zhu1   

  1. 1 College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
    2 Department of Architecture and Environmental Engineering, Taiyuan College, Taiyuan 030032, China;
    3 College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2021-01-09 Revised:2021-02-27 Online:2022-07-20 Published:2022-06-28
  • Contact: Qi Tian,E-mail:tianqi@tyut.edu.cn
  • Supported by:
    This work was financially supported by the National Natural Science Foundation of China (No.21701099), the Science and Technology Innovation Project of Colleges and Universities of Shanxi Province in 2020 (No. 2020L0721) and the Basic Research Project of Shanxi Province, China (No.201801D121267).

Synergistic effects of phosphoric acid modified hydrochar and coal gangue-based zeolite on bioavailability and accumulation of cadmium and lead in contaminated soil

Qilong Ge1,2, Qi Tian1,3, Sufang Wang1, Fang Zhu1   

  1. 1 College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
    2 Department of Architecture and Environmental Engineering, Taiyuan College, Taiyuan 030032, China;
    3 College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • 通讯作者: Qi Tian,E-mail:tianqi@tyut.edu.cn
  • 基金资助:
    This work was financially supported by the National Natural Science Foundation of China (No.21701099), the Science and Technology Innovation Project of Colleges and Universities of Shanxi Province in 2020 (No. 2020L0721) and the Basic Research Project of Shanxi Province, China (No.201801D121267).

Abstract: In this paper, a novel compound was developed by mixing H3PO4-modified cauliflower leaves hydrochar (CLH) and coal gangue-based Na-X zeolite (ZL). An alkaline soil contaminated with cadmium (Cd) and lead (Pb) was amended through the individual and synergistic application of CLH and ZL (1%CLH, 2%CLH, 1%ZL, 2%ZL and 1%CLH + 1%ZL), and Chinese cabbage was grown on it. Individual application of CLH was superior to ZL on decreasing the pH of alkaline soil and increasing soil available phosphorus (Olsen-P) and soil organic matter (SOM). In contrast, their combined application significantly improved the soil cation exchange capacity (CEC). Besides, the 1%CLH + 1%ZL was the most efficient treatment in decreasing diethylenetriamine pentaacetate (DTPA)-extractable Cd/Pb and concentrations of these two metals in cabbage root and shoot. Their synergistic application could better increase Cd and Pb immobilization and cabbage yield than their alone application. Furthermore, the immobilization of Pb for all treatments was higher than that of Cd. The synergistic immobilization mechanism of CLH and ZL reflected that the CLH precipitated and complexed with these two metals, which may block the pores of hydrochar or wrap on the surface of hydrochar. So the continuous adsorption and complexation were prevented. Nevertheless, ZL could probably alleviate this obstacle. This finding provides helpful information about using CLH combined with ZL as a soil stabilizer to immobilize heavy metals in contaminated alkaline soil.

Key words: H3PO4-modified hydrochar, Coal gangue-based zeolite, Mixture, Immobilization, Heavy metal pollution, Soil remediation

摘要: In this paper, a novel compound was developed by mixing H3PO4-modified cauliflower leaves hydrochar (CLH) and coal gangue-based Na-X zeolite (ZL). An alkaline soil contaminated with cadmium (Cd) and lead (Pb) was amended through the individual and synergistic application of CLH and ZL (1%CLH, 2%CLH, 1%ZL, 2%ZL and 1%CLH + 1%ZL), and Chinese cabbage was grown on it. Individual application of CLH was superior to ZL on decreasing the pH of alkaline soil and increasing soil available phosphorus (Olsen-P) and soil organic matter (SOM). In contrast, their combined application significantly improved the soil cation exchange capacity (CEC). Besides, the 1%CLH + 1%ZL was the most efficient treatment in decreasing diethylenetriamine pentaacetate (DTPA)-extractable Cd/Pb and concentrations of these two metals in cabbage root and shoot. Their synergistic application could better increase Cd and Pb immobilization and cabbage yield than their alone application. Furthermore, the immobilization of Pb for all treatments was higher than that of Cd. The synergistic immobilization mechanism of CLH and ZL reflected that the CLH precipitated and complexed with these two metals, which may block the pores of hydrochar or wrap on the surface of hydrochar. So the continuous adsorption and complexation were prevented. Nevertheless, ZL could probably alleviate this obstacle. This finding provides helpful information about using CLH combined with ZL as a soil stabilizer to immobilize heavy metals in contaminated alkaline soil.

关键词: H3PO4-modified hydrochar, Coal gangue-based zeolite, Mixture, Immobilization, Heavy metal pollution, Soil remediation