Characterization of H_𝟑PO_𝟒-Treated Rice Husk Adsorbent and Adsorption of Copper(II) from Aqueous Solution

Table 1

Main experimental instruments and analysis items.

Determination item	Method	Instrument
Determination of Cu(II) concentrations	Atomic absorption spectrometry	Atomic absorption spectrophotometer (Model AA6800, Shimadzu, Japan)
Element composition of raw rice husk and H3PO4-treated rice husk	X-ray fluorescence (XRF) spectrum	X-ray fluorescence spectrometer (Model Axios PW4400, PANalytical)
Analysis of functional groups may be present	FT-IR spectrum	Fourier Transform Infrared spectrophotometer (Nicolet Magne 750)
Surface morphology	Scanning electron microscopic (SEM) analysis	Scanning electron microscope (Model S-3400N, HITACHI)