Rational structure design of microwave absorption material (MAM) is of fundamental significance in terms of enhancing the electromagnetic microwave absorption performance and deeply understanding the specific correlation between the material structure and its electromagnetic microwave absorption (EMA) performance. Here, bowl-like carbon nanoparticles (BLCNs) as novel MAM have been successfully fabricated via calcination of bowl-like polydopamine. Interestingly, BLCNs have exhibited dramatically enhanced EMA performance with a minimum reflection loss of −45.3 dB and an effective bandwidth of below −10 dB in the wide range of 4.2 GHz, implying the unique critical role of the microstructure in adjusting the EMA performance. Our work not only paves an attractive way for the design of advanced and lightweight MAM, but also provides valuable insights into the relationships between the material structure and its EMA performance.

In this study, a β-cyclodextrin polymer (β-CDP) was synthesized by pretreating β-cyclodextrin (β-CD) with citric acid (CA), and then, chitosan (CTS) and β-CDP were cross-linked to prepare a biomass-based (CTS/β-CDP) composite membrane. The effects of the preparation conditions in sodium hydroxide on the adsorption amount and adsorption rate of zinc ions (Zn 2+) from simulated wastewater were investigated. The results showed that a maximum adsorption amount 123.7 μg/g and adsorption rate 94.14% of Zn 2+ were obtained when the reaction between CTS and β-CDP was performed at 50°C, the concentration of acetic acid was 2%, dissolving β-CDP water dosage was 30 ml, and the soaking time in sodium hydroxide was 1 hr. Comparative

No abstract

A neutral polysaccharide (SSPS-N) and an acidic polysaccharide (SSPS-A) were isolated from Okara by anion-exchange chromatography. The physical and chemical properties of polysaccharides were studied by HPLC, FT-IR, and SEM. The results showed that SSPS-N might be a galactomannans with a lamella-like structure, and SSPS-A might be an arabinogalactan with a complete porous structure. Furthermore, a new neutral soybean soluble polysaccharide (SSPS-N-b) with a molecular weight of 8.6 kDa was isolated from SSPS-N, and its fine structure was analyzed by GC-MS, enzymatic analysis, and NMR. The results showed that SSPS-N-b was a mixture of β-1,4galactan and glucomannan, which (1→4)βd-linked mannose and (1→4)βd-linked glucose were connected alternately, and it was in parallel with β-1,4-galactan. The antioxidant activity results showed that β-1,4-Galactan in SSPS-N-b was identified as the main activity domain. This result will be utilized for the development of SSPS as novel functional foods and medicine.

To decrease the amount of Zn2+ in industrial waste water, in this study, β-cyclodextrin (β-CD) was first modified and then used to obtain a β-cyclodextrin polymer (β-CDP). The effects of reaction temperature and reaction time of β-CD with citric acid (CA), polyethylene glycol 400 (PEG-400), and disodium hydrogen phosphate (NaH2PO4) on the amount of β-CDP produced were investigated. The results showed that at a reaction temperature of 145 °C and a reaction time of 4.5 h, 6.58 g of β-CDP was produced. Then, chitosan (CTS) was crosslinked with β-CDP using glutaraldehyde to prepare a chitosan/β-cyclodextrin (CTS/β-CDP) complex. The mass ratio of CTS to β-CDP, reaction temperature, reaction time, and amount of added glutaraldehyde were used as the main variables to examine the Zn2+ adsorption rate and adsorption capacity of the composites prepared in this study. The optimum experimental conditions were as follows: a mass ratio of 3:10, a reaction temperature of 80 °C, a reaction time of 90 min, and 2 mL of glutaraldehyde. Under these optimal conditions, the adsorption amount and adsorption rates of Zn2+ using CTS/β-CDP complex were respectively 97.70 mg·g-1 and 78.92%.