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- W2015851504 abstract "The integrity of ion exchange media used under conditions of different times of use, temperatures and pH values is important in its selection. This study was conducted to quantify the lack of integrity (attrition) in base-extracted (BE), citric acid (CA)-modified soybean hulls, a lignocellulosic cation exchange material and compare its attrition to two synthetic, commercial cation exchange resins. Attrition was determined in both batch and column operations. Batch studies included measuring attrition over a 24 h period under conditions of constant pH, variable pH and at different temperatures. Under conditions of a constant pH of 4.8, 25°C and using a stir bar, modified hulls had mostly lower attrition than the two commercial products. Under acidic conditions, modified hulls demonstrated very low (<5%) attrition. At alkaline pH values, modified hulls had higher attrition than the resins after 24 h of stirring at 25°C. Although attrition increased at alkaline pH, the modified hulls ability to bind copper ion (Cu2+) was unaffected by pH. After 24 h shaking at 65 and 85°C, modified hulls also had greater attrition than the synthetic polymers. At these temperatures, a decreased ability of the modified hulls to bind copper ion was observed compared to the lower temperatures of 25 and 45°C. When the products were compared in column experiments at 25°C, all materials had low (<10%) attrition. Our studies indicate that in terms of product integrity, modified soybean hulls could be useful in several applications requiring a metal ion adsorbent, but not necessarily at high temperatures." @default.
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- W2015851504 date "2001-03-01" @default.
- W2015851504 modified "2023-09-27" @default.
- W2015851504 title "Comparison of attrition in citric acid modified soybean hulls and commercial cation exchange resins" @default.
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- W2015851504 doi "https://doi.org/10.1016/s0926-6690(00)00063-7" @default.
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