Supporting Information

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1 Supporting Information Selective determination of Cr(VI) by glutaraldehyde crosslinked chitosan polymer fluorophores Jieyao Song a,b, Hongjian Zhou a,*, Rui Gao c, Yong Zhang a,b, Haimin Zhang a, Yunxia Zhang a, Guozhong Wang a, Po Keung Wong d, Huijun Zhao a,e,* a Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei , P. R. China b Department of Materials Science and Engineering, University of Science and Technology of China, Hefei , P. R. China c Environmental Protection Monitoring Station of Chaohu Administration Bureau, Hefei , P.R. China d School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T, Hong Kong SAR, P.R. China e Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, QLD 4222, Australia * Corresponding author: hjzhou@issp.ac.cn (H. Zhou); h.zhao@griffith.edu.au (H. Zhao); Tel: ; Fax: Figure S1. Raman spectrum of GCPF. S-1

2 Figure S2. (a) FL spectra of the GCPFs with different storage time under 4 C; (b) F/F0 (at 448 nm) of GCPF from different storage time based on the peak intensity data in (a). Figure S3. Particle size distribution of the GCPF obtained from dynamic light scattering. S-2

3 Figure S4. Photographs of GCPF suspension solution under (a) visible and (b) UV illumination. Figure S5. Fluorescence spectra of pristine chitosan, GA and GCPF under 365 nm excitation. Figure S6. (a) UV-visible absorption spectra of GCPF; (b) Fluorescent spectra of GCPF under different excitation wavelengths S-3

4 Figure S7. FL intensity-ga concentration relationship derived from the peak intensity data in Figure 2b. The error bars denote standard deviations from the triplicate measurements. Figure S8. Photostability of GCPF under UV irradiation (hand-held UV-lamp, HPL-N125W, 40mW/cm 2, nm). The error bars denote standard deviations from the triplicate measurements. S-4

5 Figure S9. F/F0 (at 448 nm) of GCPF from (a) different ionic strengths (0 100 mm NaNO3) and (b) ph ( ) solutions. The error bars denote standard deviations from the triplicate measurements. Figure S10. Fluorescence response time profile of GCPF before and after adding 100 μm Cr(VI). S-5

6 Figure S11. F/F0 (at 448 nm) of GCPF with different concentration of Cr(III) from 0 to 1000 μm in the presence of 100 μm Cr(VI). Figure S12. F/F0 (at 448 nm) of GCPF for various interference metal ions (a) in the absence and (b) in the presence of EDTA. The concentration of Cr(III), Cu(II), Cd(II), Pb(II), Zn(II), Fe(III) and Hg(II): 500 μm. The EDTA concentration: 1.0 mm. S-6

7 Figure S13. XPS survey spectra of GCPF before and after quenching by 100 μm Cr(VI). Table S1. Percentage of carbon, hydrogen and nitrogen, and oxygen for the GCPF Elements C H N O GCPF Table S2. Comparison of different fluorescent material sensors for Cr(VI) determination. Fluorescence sensors Linear range Detection Responsive (μm) limit (μm) time Ref. Fluorescent carbon dot min 1 GSH-capped CdTe quantum dots min 2 Bimetallic Au-Ag nanocluster min 3 Cobalt(II)-doped carbon dots seconds 4 Acridine fluorophore D-TPE/p(NIPAM-co-AAc) brushes film N, S-co-doped carbon dots min 7 NU h 8 GCPF s This work S-7

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