TY - JOUR
T1 - Removal of Microcystis aeruginosa and microcystin-LR using chitosan (CTS)-modified cellulose fibers and ferric chloride
AU - Liu, Mingmeng
AU - Zhang, Junjie
AU - Wang, Lingling
AU - Zhang, Haiyang
AU - Zhang, Wen
AU - Zhang, Xuezhi
N1 - Funding Information:
This work was partially supported by the National Key Research and Development Program “Intergovernmental International Science and Technology Innovation Cooperation of China (2018YFE0110600), New Jersey Department of Environmental Pollution (NJDEP)’s Prevent, Mitigate and/or Control of Freshwater Harmful Algae Blooms (HABs) Grant (Award Number: 1343716), and the Features Institute Service Projects from the Institute of Hydrobiology, the Chinese Academy of Sciences (Y85Z02-1-3-1). We thank Engineer Jun Men, Fang Zhou, Yuan Xiao (The Analysis and Testing Center of Institute of Hydrobiology, Chinese Academy of Sciences) for their assistance in taking MC-LR, CLSM, and SEM imaging measurements, respectively.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/3/1
Y1 - 2023/3/1
N2 - The occurrences of harmful algae blooms (HABs) and cyanotoxins such as microcystin-LR (MC-LR) are increasing in water reservoirs and compromise drinking water security. In this study, chitosan (CTS) modified cellulose fibers (CF) were developed as a green adsorbent for the simultaneous removal of a model algae cell, Microcystis aeruginosa, and MC-LR. The results showed that the CTS modification could render amine groups (−NH2) on CF and increased the adsorption affinity toward algae. In the absence of algogenic organic matter (AOM), the algae removal reached 100% at a dosage of 26.7 g-NH2-CF/g-algae (dry weight); however, at the same CF dosage, the presence of AOM (8.13 mg‑carbon·L−1) strongly reduced the adsorption by NH2-CF and removal rate of algae cells reached only 3.2 ± 3.0%. When adding FeCl3 or Fe3+ at a concentration of 11.2 mg-Fe·L−1, the inhibitory effect of AOM was dramatically reduced as indicated by the improved algae removal up to 95% at an NH2-CF dosage of 20.45 g·g−1, because of the reduced energy barrier between NH2-CF and cells. Moreover, when the Fe3+ concentration was increased to 16.8 mg·L−1, 79% of MC-LR was simultaneously removed. Thus, combining Fe3+ with NH2-CF is proven effective to enhance the adsorption and removal of Microcystis aeruginosa and MC-LR and achieve a sustainable mitigation of HABs.
AB - The occurrences of harmful algae blooms (HABs) and cyanotoxins such as microcystin-LR (MC-LR) are increasing in water reservoirs and compromise drinking water security. In this study, chitosan (CTS) modified cellulose fibers (CF) were developed as a green adsorbent for the simultaneous removal of a model algae cell, Microcystis aeruginosa, and MC-LR. The results showed that the CTS modification could render amine groups (−NH2) on CF and increased the adsorption affinity toward algae. In the absence of algogenic organic matter (AOM), the algae removal reached 100% at a dosage of 26.7 g-NH2-CF/g-algae (dry weight); however, at the same CF dosage, the presence of AOM (8.13 mg‑carbon·L−1) strongly reduced the adsorption by NH2-CF and removal rate of algae cells reached only 3.2 ± 3.0%. When adding FeCl3 or Fe3+ at a concentration of 11.2 mg-Fe·L−1, the inhibitory effect of AOM was dramatically reduced as indicated by the improved algae removal up to 95% at an NH2-CF dosage of 20.45 g·g−1, because of the reduced energy barrier between NH2-CF and cells. Moreover, when the Fe3+ concentration was increased to 16.8 mg·L−1, 79% of MC-LR was simultaneously removed. Thus, combining Fe3+ with NH2-CF is proven effective to enhance the adsorption and removal of Microcystis aeruginosa and MC-LR and achieve a sustainable mitigation of HABs.
KW - Algae and MC-LR removal
KW - Chitosan
KW - DLVO
KW - Modified cellulose fibers
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U2 - 10.1016/j.seppur.2022.122889
DO - 10.1016/j.seppur.2022.122889
M3 - Article
AN - SCOPUS:85144886049
SN - 1383-5866
VL - 308
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 122889
ER -