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应助: 0 (幼儿园)
金币: 2582.4
散金: 110
红花: 2
帖子: 610
在线: 269.9小时
虫号: 6428
注册: 2003-04-10
性别: GG
专业: 食品加工技术

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2.1. Materials
Palygorskite (PAL) powder was provided by the Mingguang
Colloidal Co. Ltd., (Anhui, China), and was dried to constant weight
at 105 °C before use. Methylene blue (MB) was purchased from Alfa
Aesar, Ward Hill, MA, U.S.A., used without further purification. The
solution was prepared with distilled water.
2.2. Methods
1.0 kg of raw PAL was put in the helical disc stone miller with
diameter of 22 cm (Xinkun Stone machinery Factory, Shandong,
China) at 10 rpm and grinded for 0–10 times with each times of
60 min, then the samples were sieved through a screen with diameter
of 75 μm. The samples were denoted as PAL-0 to PAL-10 according to
the grinding times, respectively.
FTIR spectra of the samples were recorded with a Nicolet Nexus
TM spectrophotometer (Thermo, Madison, USA) in the range of
4000–400 cm−1 using KBr pellets. FESEM observations were carried
out employing a JSM-6701F field emission scanning electron microscope
(JEOL) after coating the sample with gold. XRD analysis was
performed using an X-ray powder diffractometer with Cu anode
(PAN analytical Co. X'pert PRO), running at 40 kV and 30 mA. The
specific surface area and pore structure were analyzed with an Accelerated
Surface Area and Porosimetry System (Micromeritics, ASAP
2020, Atlanta, USA) using N2 as an adsorbate at −196 °C. The BET
specific surface area (SBET) [19] was examined using the data in the
relative pressure range of 0.1–0.3 and the micropore volume (Vmicro),
micropore area (Smicro) and external surface area (Sext) were determined
by t-plot method. The mesopore volume (Vmeso) was determined
by subtracting the micropore volume from the volume of N2
adsorbed at a relative pressure of 0.95. The pore-size distribution
was estimated by the Barrett–Joyner–Halenda (BJH) method [20,21].
The microstructural parameters of PAL samples were analyzed in triplicate
and the standard deviation was lower than 1%.
The adsorption properties of treated PAL samples toward MB were
investigated. The experimental conditions were 0.025 g of grinded
PAL sample mixed with 50 mL of 500 mg/L MB solution (pH=7.0)
in 100 mL flask, and shaken on a thermostatic shaker (THZ–98)
with a constant speed of 120 rpm at 30 °C for 660 min to reach the
adsorption equilibrium. The residual concentration of MB solution
after adsorption was measured with a Specord 200 UV/visible spectrophotometer
(Germany) by monitoring the absorbance at a wavelength
of maximum absorbance (670 nm).

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