A Multifunctional Microspheric Soil Conditioner Based on Chitosan-Grafted Poly(acrylamide-co-acrylic acid)/Biochar

Abstract

A multifunctional microspheric soil conditioner based on chitosan-grafted poly(acrylamide-co-acrylic acid)/biochar [CS-g-P(AM-co-AA)/BC] was prepared. First, the P(AM-co-AA) was synthesized and successfully grafted onto CS, and the three-dimensional network structure of microspheres was formed with N,N-methylenebis-(acrylamide) as the cross-linking agent according to the inverse suspension polymerization method. Meanwhile, BC and urea were encapsulated into the body of microspheres during the polymerization. The structure of the microspheres was analyzed by Fourier transform infrared spectroscopy, polarized optical microscopy, and scanning electron microscopy, and the mechanism of adsorption of Cu 2+ on the microspheres was investigated by X-ray photoelectron spectroscopy. Furthermore, the experimental results demonstrated the excellent water absorption and retention capabilities of microspheres, and the release rate of urea was dramatically reduced. Importantly, the introduction of BC significantly enhanced the adsorption performance of the microspheres with respect to heavy metal ions. Consequently, the multifunctional soil conditioner held promise for use in soil improvement and agricultural production.

Aminated Multiwalled Carbon Nanotube-Doped Magnetic Flower-like WSe2 Nanosheets for Efficient Adsorption in Acidic Wastewater

“…Further, to confirm the conclusion that the doping of Fe 3 O 4 with CNT-NH 2 can increase the specific surface area for better adsorption performance, the sample pore characteristics were characterized through N 2 adsorption–desorption measurements (Figure G,I). It can be found that WSe 2 and Se 2 @Fe 3 O 4 @CNT-NH 2 exhibited type IV isotherms as well as type H3 hysteresis loops, which are features of mesoporous materials. − The specific surface areas of WSe 2 and the flower-like WSe 2 @Fe 3 O 4 @CNT-NH 2 nanocomposite were 12.8 and 50.2 m 2 /g, respectively. The relative pore size distribution (PSD) curves showed that the majority of the pore sizes were in the ranges of 2–4 and 2–6 nm, respectively.…”

Carbon Nanotubes/Polydopamine/ZSM-5 Composite Soil Conditioner with Good Controlled Release and Adsorption Properties

“…Therefore, ZSM-5@PDA−CNT−FA can adapt to different environments to solve the acid−alkaline problems currently faced by soils and has wide applicability. To further understand the release mechanism of FA in the samples, first-order (eq 3), Higuchi (eq 4), Ritger−Peppas (eq 5), and parabolic diffusion (eq 6) models were used to fit the slow-release data of FA 48,49 M M kt ln(1 / )…”

“…To further understand the release mechanism of FA in the samples, first-order (eq ), Higuchi (eq ), Ritger–Peppas (eq ), and parabolic diffusion (eq ) models were used to fit the slow-release data of FA , where M t / M ∞ is the fraction of urea released, k is the release rate constant, n is the diffusion index, and b is a constant.…”

Agricultural Applications of Superabsorbent Polymer Hydrogels

“…In [ 127 ], a multifunctional microspheric soil conditioner based on chitosan-grafted poly(acrylamide- co -acrylic acid)/biochar [CS- g -P(AM- co -AA)/BC] was prepared. First, the P(AM- co -AA) was synthesized and successfully grafted onto CS, and the three-dimensional network structure of microspheres was formed with N , N -methylenebis(acrylamide) as the cross-linking agent according to the inverse suspension polymerization method.…”