Synthesis of Iron Doped Zeolite Imidazolate Framework-8 and Its Remazol Deep Black RGB Dye Adsorption Ability

Table 4

Results of piecewise regression for the two linear segments for ZIF-8 and Fe-ZIF-8 (the values in parentheses are at a 95% confidence level).

Adsorbent	Concentration; (mg·L^−1)	Break point (minute^0.5)	The first linear segment		The second linear segment
			Intercept 1	Slope 1	Intercept 2	Slope 2
ZIF-8	30	5.92	−2.83; (−5.11 : −0.55)	4.68	19.16; (17.58 : 20.74)	0.75
	40	7.07	−10.29; (−17.10 : −3.47)	4.83	27.06; (25.29 : 28.83)	0.67
	50	8.94	−10.19; (−12.28 : −8.10)	5.58	34.85; (32.21 : 37.49)	0.52
Fe-ZIF-8	30	9.49	22.58; (20.16 : 25.00)	3.85	78.07; (75.00 : 81.15)	−1.97
	40	10.00	8.13; (2.64 : 13.63)	6.82	98.79; (93.99 : 103.59)	−2.26
	50	8.94	25.38; (23.59 : 27.16)	6.01	80.15; (78.58 : 81.72)	−0.15