数字农科院2.0

Recycling and reuse of waste agricultural plastics with hydrothermal pretreatment and low-temperature pyrolysis method

文献类型: 外文期刊

作者: Bingkun Chen;Feng Shen;Li Tong;Jiajiang Zhou;Richard Lee Smith;Haixin Guo

作者机构:

关键词: Food security;Functional biochar;Mulch film recycling;Nitrogen and phosphorus adsorbent;Polyethylene-lime pyrolysis

期刊名称: Chemosphere

ISSN: 0045-6535

年卷期: 2024 年 362 卷

页码:

收录情况: SCIE(2024版) ; ; EI(2024版)

摘要: Recycling and reuse of agricultural plastics is an urgent worldwide issue. In this work, it is shown that low-density polyethylene (PE) typically used in mulch films can be converted into high-capacity P and N adsorbents through a two-step method that uses hydrothermal pretreatment (180 °C, 24 h) followed by pyrolysis at 500 °C with Ca(OH)2 additive. CaPE@HC500 materials prepared with the proposed two-step method were found to have high adsorption capacities for phosphate (263.6 mg/g) and nitrogen (200.7 mg/g) over wide ranges of pH (3–11). Dynamic adsorption of phosphate by CaPE@HC500 material in a packed-bed had a half-time breakthrough of 210 min indicating the feasibility of continuous systems. Material stability, cost, environmental-friendliness, and recyclability of the CaPE@HC500 material were determined to be superior to literature-proposed Ca-containing adsorbents. The two-step method for converting waste agricultural plastic mulch films into adsorbents is robust and highly-applicable to industrial settings.

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