Water, Air, & Soil Pollution

Supplementary Materials

Mechanisms and factors influencing adsorption of microcystin-LR on biochars

Liang Li1, Yuping Qiu1, *, Jiexun Huang2, Feili Li2, G. Daniel Sheng1

1 State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; 2 College of Biological Chen et al. 2008

Number of Pages: 12

Number of Figures: 5

Number of Tables: 6

1

Fig. 1S. Structure of MCLR and MCRR

1

Fig. 2S. Kinetics of removal of MCLR from water by BC-700 and BC-300 at 298 K


Fig. 3S. Calculation of adsorption thermodynamics of MCLR on BC-700 and BC-300


Fig. 4S. Effect of cosolutes (NaNO3 and Na3PO4) on the adsorption of MCLR to BC-700 at pH 7.9 at 298 K


Fig. 5S. Structure of bis(2-(2-hydroxyethyl)guanidine)sulfate (a) and guanidinium π-group (b)

1

Table 1S. Selected physicochemical parameters of sediments

Organic carbon
(%) / Cation-exchange capacity (cmolc/kg)
THL / 4.66 / 45.4
BHC / 2.37 / 52.2


Table 2S. The MC-LR recoveries of the SPE methods

Added MC-LR (μg) / Recovered MC-LR (μg) / Recovery (%) / Average Recovery (%)
1 / 0.93 / 93.0 / 95.0
0.97 / 97.0
6 / 5.41 / 90.2 / 89.8
5.37 / 89.5
10 / 9.05 / 90.5 / 90.6


Table 3S. Elemental compositions and atomic ratios of BC-700 and BC-300

C (%) / H (%) / N (%) / O (%) / O/C / (O+N)/C / H/C
BC-700 / 80.4 / 1.21 / 0.78 / 17.61 / 0.164 / 0.173 / 0.179
BC-300 / 70.1 / 3.63 / 0.89 / 25.38 / 0.272 / 0.283 / 0.617

H/C: atomic ratio of hydrogen to carbon

O/C: atomic ratio of oxygen to carbon

(O+N)/C: atomic ratio of sum of nitrogen and oxygen to carbon

1

Table 4S. BET specific surface area (SBET), pore volume (V), micropore volume (Vmicro), average pore size (D), surface acidity, surface basicity and the points of zero charge (pHPZC) of BC-700 and BC-300

SBET
(m2 g-1) / V
(cm3 g-1) / Vmicro
(cm3 g-1) / D
(nm) / Surface acidity
(mmol g-1) / Surface basicity
(mmol g-1) / pHPZC
BC-700 / 392.1 / 0.238 / 0.136 / 2.43 / 0* / 1.27 / 9.7
BC-300 / 4.094 / 0.028 / 0 / 27.7 / 0.23 / 0.46 / 8.5

* The actual measured results are all slightly less than 0, indicating the absence of the surface acidity on BC-700.


Table 5S. Langmuir and Freundlich parameters for adsorption of MCLR on BC-700 and BC-300 at equilibrium pH 7.5 at 283, 298 and 313 K

Adsorbents / Temperature / Langmuir model / Freundlich model
(K) / KL
(l g-1) / qm
(μg g-1) / R2 / KF
[(μg g-1)/(μg l-1)n] / N / R2
BC-700 / 283 K / 0.547±0.100 / 2898±134 / 0.9668 / 1221±176 / 0.232±0.049 / 0.8573
298 K / 0.787±0.123 / 3719±158 / 0.9755 / 1567±143 / 0.263±0.033 / 0.9331
313 K / 0.816±0.090 / 4197±147 / 0.9855 / 1753±184 / 0.278±0.043 / 0.8939
BC-300 / 283 K / 0.006±0.002 / 926±147 / 0.9791 / 17.3±5.6 / 0.653±0.068 / 0.9687
298 K / 0.017±0.004 / 737±79 / 0.9641 / 52.4±11.2 / 0.465±0.047 / 0.9742
313 K / 0.039±0.007 / 686±37 / 0.9783 / 120.4±28.1 / 0.322±0.052 / 0.9486

1

Table 6S. Langmuir parameters for the adsorption of MCLR on BC-700 influenced by DOMs at equilibrium pH 7.5 at 298 K

DOM / Langmuir model
KL
(l g-1) / qm
(μg g-1) / R2
Control / 0.787±0.123 / 3719±158 / 0.9755
GA / 0.287±0.032 / 3511±140 / 0.9865
FA / 0.287±0.031 / 2864±99 / 0.9878
TA / 0.012±0.009 / 301±60 / 0.9652

1