International Scholarly Research Notices

Research Article

Biosorption of Cr(III) and Pb(II) by Schoenoplectus californicus and Insights into the Binding Mechanism

Table 3

Isotherm model constants for simple and competitive biosorption of lead and chromium on the shoots biomass of S. californicus at different pH values.


		Chromium (III)				Lead (II)
		Simple		Competitive		Simple		Competitive
		pH 5	pH 7	pH 5	pH 7	pH 5	pH 7	pH 5	pH 7

Langmuir	(μmol g⁻¹)	78,74	370,37	312,50	22,73	81,30	54,05	98,04	4,99
	(L·g⁻¹)	0,0026	0,0011	0,0007	0,0347	0,0042	0,0108	0,0019	0,0462
		0,998	0,982	0,996	0,990	0,747	0,821	0,937	0,993

Freundlich	(L g⁻¹)	0,380	0,485	0,406	0,503	0,121	0,456	0,108	0,080
		1,210	1,141	1,205	0,653	0,739	0,757	0,865	0,553
		0,966	0,987	0,995	0,841	0,790	0,809	0,873	0,799

Temkin	(kJ mol⁻¹)	0,297	0,151	0,081	0,388	0,068	0,124	0,069	0,258
	(L μmol⁻¹)	0,175	0,186	0,018	0,543	0,061	0,151	0,027	0,221
		0,894	0,976	0,866	0,936	0,868	0,884	0,962	0,750

Dubinin- Radushkevich	(mmol g⁻¹)	0,69	1,55	1,03	2,50	115,94	54,17	6,46	139,91
	(kJ mol⁻¹)	8,51	8,28	8,11	8,51	5,79	6,54	6,80	6,32
		0,986	0,898	0,994	0,998	0,980	0,829	0,902	0,951