Effect of Preparation Methods on the Adsorption of Glyphosate by Calcined Ca–Al Hydrotalcite

Abstract

Calcined Ca−Al hydrotalcites were prepared by the clean method (Ca-LDO-1) and traditional co-precipitation method (Ca-LDO-2), respectively. The effect of the preparation method on the adsorption of glyphosate by calcined Ca−Al hydrotalcites was investigated. The adsorbents were also characterized by X-ray diffraction (XRD), thermogravimetric (TG) analysis, inductively coupled plasma optical emission spectroscopy (ICP-OES), and low-temperature N 2 adsorption− desorption, respectively. Compared with Ca-LDO-2, Ca-LDO-1 had higher specific surface area and pore volume, which caused it to show better adsorption performance and reusability for the adsorbing of glyphosate. In addition, the kinetics and thermodynamics of the adsorption of glyphosate by Ca-LDO-1 were studied. The results showed that it was more consistent with the pseudo-secondorder kinetic equation and Langmuir isotherm equation.

Advanced Pyrene Copolymer/rGO Hydrogels for Efficient Congo Red Removal from Aqueous Systems

“…This is indicated by higher R 2 values and a closer match between the calculated equilibrium amount of dye adsorbed on the adsorbent (q e,cal ) and the experimental equilibrium amount of dye adsorbed on the adsorbent (q e,exp ) values, compared to the other models. These findings suggest that the rate‐limiting step may arise from chemisorption [42] . Figure 9 demonstrates that the plots for each CR concentrations did not intersect the origin This suggests that intra‐particle diffusion alone is not the sole rate‐controlling step for CR adsorption, instead, it is possible that other kinetic models are concurrently influencing the adsorption rate.…”

“…These findings suggest that the rate-limiting step may arise from chemisorption. [42] Figure 9 demonstrates that the plots for each CR concentrations did not intersect the origin This suggests that intra-particle diffusion alone is not the sole rate-controlling step for CR adsorption, instead, it is possible that other kinetic models are concurrently influencing the adsorption rate.…”

Calcined Bean Dregs-Hydrocalumite Composites as Efficient Adsorbents for the Removal of Ofloxacin

“… 25 In the spectrum of 70% BD-CaAl-LDH600, 23.1°, 29.5°, 36.1°, and 48.6° are the characteristic diffraction peaks of calcium–aluminum composite oxides such as Ca 12 Al 14 O 33 , and 39.5°, 43.3°, and 47.5° are the characteristic diffraction peaks of CaCO 3 , which indicates that the composite contains calcium–aluminum composite oxide and CaCO 3 . 20 , 26 , 27 In addition, no diffraction peaks of amorphous carbon was found in the 70% BD-CaAl-LDH600, indicating that bean dregs carbon exhibits good dispersion, and most of the bean dregs carbon may be wrapped by calcined hydrocalumite. 28 …”

“…25 In the spectrum of 70% BD-CaAl-LDH600, 23.1°, 29.5°, 36.1°, and 48.6°are the characteristic diffraction peaks of calcium−aluminum composite oxides such as Ca 12 Al 14 O 33 , and 39.5°, 43.3°, and 47.5°are the characteristic diffraction peaks of CaCO 3 , which indicates that the composite contains calcium−aluminum composite oxide and CaCO 3 . 20,26,27 In addition, no diffraction peaks of amorphous carbon was found in the 70% BD-CaAl-LDH600, indicating that bean dregs carbon exhibits good dispersion, and most of the bean dregs carbon may be wrapped by calcined hydrocalumite. 28 The specific surface area (S BET ), pore size distribution, and pore volume were tested by N 2 physical adsorption methods, and the result is shown in Figure 3 and Table 1.…”

Investigating the Effect of Using Glyphosate on Microbial Soil in Sweet Corn Cultivation

“…Glyphosate can control weeds in agriculture, including corn cultivation [4]. Glyphosate is a polarized compound known for its ability to adsorb Fe and Al oxides and clay minerals [5]. Enzyme activity is a sensitive parameter, often used to observe the impact of pollutants on soil microorganisms [6].…”