It could be seen that with the increase in the DB18C6 addition amount, the total pore volume showed a trend of first decreasing and then increasing.
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Microwave Irradiation-Assisted Synthesis of Anisotropic Crown Ether-Grafted Bamboo Pulp Aerogel as a Chelating Agent for Selective Adsorption of Heavy Metals (M<sup>n+</sup>).
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The sentences
The main reason for this phenomenon was that DB18C6 would block the internal channels of bamboo pulp aerogels; therefore, the total pore volume showed a decreasing trend at first.
With the increase in the DB18C6 addition, the internal pore wall structure would be further damaged; meanwhile, the pore channels were further connected, and the total pore volume showed an increasing trend.