A highly efficient nanoscale tapioca starch prepared by high‐speed jet for Cu²⁺ removal in simulated industrial effluent

Abstract

BACKGROUND Nanoscale tapioca starch (NTS) was successfully developed by high‐speed jet in our previous study. In this study, the adsorption capacity of Cu2+ onto NTS was further discussed. The optimal adsorption conditions (pH, contact time, contact temperature, initial Cu2+ concentration, and adsorbent concentration), adsorption kinetics, isotherms, and thermodynamic were also evaluated. RESULTS The results showed that NTS exhibited excellent performance in adsorption of Cu2+, with adsorption capacities of 122.31 mg g−1 for Cu2+ (pH 7, 0.04 g L−1, 0.2 g L−1, 313.15 K and 10 min). The pseudo‐second‐order and Langmuir isotherms models could be used to explain the adsorption kinetics and adsorption equilibrium, respectively. The thermodynamic results showed that the adsorption process was spontaneous and endothermic with an increase in entropy. Cu2+ was adsorbed onto NTS, which was confirmed by energy dispersive spectrometry analysis. CONCLUSION These findings indicated that NTS might be an effective, environment‐friendly and renewable bio‐resource adsorbent for removing heavy metals in industrial effluent. © 2021 Society of Chemical Industry

Nano-encapsulation of polyphenols in starch nanoparticles: fabrication, characterization and evaluation

“…With the increase of contact time, the surface adsorption sites gradually decreased until a saturation state was reached and the adsorption capacity reached equilibrium. 19 Furthermore, the polyphenol absorption capacities of TSNs were ranked as PAC (68.69 mg g −1 ) > CC (33.34 mg g −1 ) > EC (21.14 mg g −1 ), which may be related to the polyphenol molecular weight. This result was consistent with the observation reported previously, 15 where a higher polyphenol adsorption capacity was obtained by starch nanoparticles with a higher polyphenol molecular weight.…”

“…The native starch was spherical with a smooth surface and a particle size of 14 600 ± 1200 nm (data not shown), which was similar to that reported in our previous literature. 19,20 The nanostarches were obtained by a HSJ (240 MPa) after pretreatment of micronization with a particle size of 68 ± 3 nm (see Fig. 1a).…”

“…16,17 In our previous report, 18 we prepared tapioca starch nanoparticles (TSNs) by a high speed jet from native tapioca starch granules which is the novel technology in recent years and is considered as a good, non-toxic, biodegradable and environmental technique compared to chemical methods for producing starch nanoparticles. Also, the adsorption of heavy metals (Cu 2+ ) 19 and the hydrophobic substance myricetin 20 by TSNs was also studied. The objective of the present study is to investigate the adsorption kinetics and isotherm behavior of three water-soluble polyphenols (catechin (CC), epicatechin (EC) and proanthocyanidins (PACs)) on TSNs.…”

Selective removal of Pb(II) from yellow rice wine using magnetic carbon‐based adsorbent

“…The high correlation coefficient (R 2 = 0.9982) showed that the adsorption of Pb(II) on M-NC followed the pseudo-second-order model, meaning that the dominant mechanism of the adsorption process was chemical adsorption instead of physical adsorption. 36 The intraparticle diffusion kinetic plot is illustrated in Fig. 2(d).…”