Preparation of Tetra Pak-Based Hydrochars for Cleaning Water Polluted by Heavy Metal Ions: Physicochemical Properties and Removal Mechanism

Table 4

Composition of Tetra Pak-based hydrochars prepared under different hydrothermal carbonization conditions.

System	T (°C)	Oxygenated site		Aluminum-silicon site
		IonS1	DS1 (mmol/g)	IonS2	DS2 (mmol/g)
TP1-Zn^2+	30	1.8	4.7E − 02	—	—
	40	2.0	6.3E − 02	—	—
TP5-Pb^2+	30	1.0	3.8E − 02	3.2	1.6E − 02
	40	1.3	2.9E − 02	3.0	2.6E − 02
TP8-Hg^2+	30	0.7	7.6E − 02	3.0	6.4E − 02
	40	0.9	1.6E − 01	2.1	2.6E − 02