Eco-Friendly Coffee Waste-Based Carbon Dots Coupled to ZnBi-Layered Double Hydroxide Heterojunction: Enhanced Control of Interfacial Charge Transfer for Highly Efficient Visible-Light Catalytic Activity

Table 1

Data for degradation and mineralization ability of CDs (2%)-ZnBi₂O₄.

Recycle number	1^st	2^nd	3^rd	4^th
TOC initial concentration (mg/L)	13.11 ± 0.19
TOC at the end of visible radiation exposure (mg/L)	1.76 ± 0.21	2.36 ± 0.19	2.47 ± 0.17	2.63 ± 0.28
Mineralization of 2,4-D (%)	86.6 ± 1.6	82.0 ± 1.6	81.1 ± 1.1	79.9 ± 2.4
Decomposition of 2,4-D (%)	91.1 ± 1.8	89.8 ± 3.1	87.8 ± 2.9	86.4 ± 1.5
Different between 2,4-D decomposition and mineralization (%)	4.5	7.8	6.7	6.5
Chloride amount according to 30 mg/L 2,4-D (mg/L)	9.70
Initial concentration of inorganic anion Cl^− (mg/L)	0
Inorganic anion Cl^− at the end of visible radiation exposure (mg/L)	8.79 ± 0.12	8.61 ± 0.11	8.27 ± 0.14	7.98 ± 0.19
Dechlorination efficiency (%)	90.7 ± 1.2	88.8 ± 1.1	85.3 ± 1.4	82.2 ± 1.9