Research on Adsorption of Methylene Blue onto the Mesoporous Silica Microspheres

Abstract

Mesoporous silica microspheres (MSM) with diameter about 100 nm were prepared by hydrothermal synthesis using cetyl trimethyl ammonium bromide(CTAB) as template agent and tetraethyl orthosilicate(TEOS) as silica source. And they were characterized byscanning electron microscopy (SEM) , N2 adsorption-desorption analysis , infrared spectroscopy (FT-IR). Then methylene blue adsorption test was investigated. Effect of pH, temperature of the adsorption of methylene blue onto MSM were studied. The adsorption amount onto MSM increased with the initial pH-value of the solution in the range of 3~10. Alkaline was more favorable to adsorption. The adsorption amount onto MSM decreased with the initial temperature of the solution at 22 °C~ 45 °C. low-temperature was more favorable to adsorption. The adsorption isotherm of methylene blue on MSM could be described by the Langmuir model.

Adsorption of nitrification inhibitor nitrapyrin by humic acid and fulvic acid in black soil: characteristics and mechanism

“…Previous studies found that the adsorption kinetics of organic compounds on soil or soil organic matter conforms to the quasi-second-order kinetic equation. 26,[37][38][39][40] The adsorption kinetics of nitrapyrin on HA, FA and HA + FA t the quasisecond-order kinetic equation best (P < 0.05), and the t equilibrium adsorption capacity was consistent with the experimental results (Table 2). The quasi-second-order kinetic equation tting effect of nitrapyrin on HA + FA was better than on HA or FA, and that of HA was better than that of FA.…”

“…For the adsorption of organic compounds on HA or FA, generally, the Langmuir isotherm parameters increase with an increase of reaction temperature. [39][40][41] The increase of temperature promoted the diffusion of nitrapyrin molecules, reduced the solution viscosity, and promoted the entry of nitrapyrin molecules into This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.…”

Adsorption of sulfamethoxazole (SMZ) and ciprofloxacin (CIP) by humic acid (HA): characteristics and mechanism

“…The adsorption of CIP and SMZ on HA was well (Table 6), which indicated that a low temperature favoured the adsorption of CIP on HA, similar to most adsorption experiments. [36][37][38][39] However, the adsorption capacity of SMZ on HA increased with increasing temperature. The parameter K F of SMZ in 318 K was 1.99 and 1.46 times than for 298 K and 308 K, respectively, indicating that the adsorption capacity of HA to CIP signicantly increased and that the high temperature was favourable to adsorption.…”

An Alternative and Simple Method for the Preparation of Bare Silica Nanoparticles Using Sugarcane Waste Ash, an Abundant and Despised Residue in the Brazilian Industry

“…This is an expected result since these nanoparticles are bare and the only possible interaction is the electrostatic interaction between the negative charges on the surface of the silica nanoparticles and the positive charge of MB. 40,[42][43][44][45][46][47] This way this type of interaction can only generate a single layer of molecules on the surface of the nanoparticles, and after the neutralization of the surface, there is a saturation of the surface.…”