2. Experimental2.1. Materials and e

2. Experimental
2.1. Materials and experiment apparatuses
2.1.1. Reagents
All chemicals are of analytical grade and used as received
without any purification. Resin D301 is purchased from
Changzhou Bo Yan adsorption material Technology Co.
Ltd., (China) and glyphosate (mass fraction is 95%) is
provided by a chemical factory (Zhejiang, China). The solution
of glyphosate (1.0% mass fraction, pH = 6.0 is adjusted with
NaOH) is prepared, to some extent, which is similar to the
properties of original wastewater of glyphosate supplied by
the chemical factory (Zhejiang, China), especially in pH value
and concentration. So it can be used to simulate the original
wastewater. Resin D301 is prepared according to a previous
work (Peng et al., 2007). Distilled-deionized water is used
throughout the experiments.
2.1.2. Apparatus
FA1004 Electronic Analytical Balance (Shanghai Precision &
Scientific Instruments Co. Ltd., Shanghai, China); UV–visible
spectrophotometer (UV-2401PC, Shimadzu Corporation,
Japan); THZ-98A type Constant-temperature Shaker
(Scientific Instruments Co. Ltd., Shanghai, China).
2.1.3. Adsorption procedures
In a typical adsorption procedure, 0.5 g of Resin D301 mixed
with 45 mL of glyphosate solution in an iodine number flask is
shaken under a controlled temperature and at 150 rpm (r min1)
of constant-temperature shaker. After reaching the adsorption
equilibrium, the concentration of glyphosate in the liquid phase
is determined with spectrophotometry. The capacity of static
equilibrium adsorption could be kept as the main observation
index. The formula is written by the following equation: