Removal of microcystin-LR from drinking water using a bamboo-based charcoal adsorbent modified with chitosan

Zhang, Hangjun; Zhu, Guoying; Jia, Xiao‐Bin; Ding, Ying; Zhang, Mi; Gao, Qingwei; Hu, Ciming; Xu, Song

doi:10.1016/s1001-0742(10)60676-6

Cited by 36 publications

(18 citation statements)

References 33 publications

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“…This extract contained four MC variants (MC-LR, MC-LY, MC-LW and MC-LF) detected by high-performance liquid chromatography (HPLC), MC-LR being the dominant (75 % of total microcystins). MC-LR has a molecular weight of 994 Da and molecular dimensions of 1.4-2.6-2.9 nm (Sathishkumar et al 2010;Zhang et al 2011) and a net charge of -1 in the pH range tested (5.2-6.7) (Campinas and Rosa 2006).…”

Section: Microcystin-lrmentioning

confidence: 99%

How do the HSDM and Boyd’s model compare for estimating intraparticle diffusion coefficients in adsorption processes

et al. 2014

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Adsorption kinetics is a key-issue for a successful activated carbon selection and design of the treatment system. Crucial predictive aspects are the determination of the diffusion coefficients and the establishment of the controlling adsorption step. Several kinetic models have been developed and two of the most frequently used, the homogeneous surface diffusion model (HSDM) and the Boyd's model, were applied to microcystins, and particularly MC-LR adsorption. Different initial MC-LR concentrations and carbons (particle diameter, porosity), yielding diverse Biot numbers (Bi), were tested. The model outcomes were compared, namely the Boyd's effective intraparticle diffusion coefficient (D i ) with the HSDM surface diffusion coefficient (D s ), as well as the Bi and Boyd's criteria to establish the controlling adsorption step, which constitute a novel approach. Very good HSDM fittings were achieved with a constant diffusion model (D s independent of MC-LR surface concentration). D i was similar to D s whenever Boyd plots intercepted the origin. The Biot limit above which it may be considered that intraparticle diffusion is the rate limiting step depended on the carbon. A lower limit was observed for smaller carbons.

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Section: Microcystin-lrmentioning

confidence: 99%

How do the HSDM and Boyd’s model compare for estimating intraparticle diffusion coefficients in adsorption processes

et al. 2014

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“…However the use of chemical products increases the extracellular microcystin level in the freshwater treatment by lysis of cyanobacteria cells. In similar work Zhang et al(2011) were tested bombon-based charcoal adsorbent modified with chitosan to removal microcystin from drinking water and their conclusion was the efficiency this product depends of the pH and the organic matters dissolved in water. The diatomite filter efficiency depending of the size of the pores of the diatomite filter and the size of cyanobacterial cell, so not affected by the chemical or the physical parameters of water.…”

Section: Resultsmentioning

confidence: 99%

Removal Cyanobacteria by Diatomite Filter from Raw Freshwater and Potential Use in Watering Domestic Animals

Behira¹

2015

AVS

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Abstract:Growing harmful cyanobacteria in freshwater cause several poisoning episodes of livestock, wild and domestic animal. Conventional surface drinking water treatment utilizes coagulation; flocculation, sedimentation, filtration and disinfection are inadequate and require great financial means or application in watering domestic animals. The filtration of raw freshwater by diatomite is very simple without use of chemical products. Samples of locally diatomite were dried ant calcined and tested to verify their efficiency to removal cyanobacteria cells from raw freshwater. The results obtained shows that filtration by calcined diatomite improve high efficiency to removal cyanobacteria and decrease the level of microcystin in the filtrate solutions.

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“…The high porosity, chemical stability, and significant sorption efficiency for removing cyanotoxins are among the central advantages of biochar [25]. In aqueous solutions, biochar and modified charcoal have provided promising results as sorbents [27][28][29], however, existing knowledge gaps have hindered widespread application in water treatment processes.…”

Section: Introductionmentioning

confidence: 99%

The Use of Biochar and Pyrolysed Materials to Improve Water Quality through Microcystin Sorption Separation

Frišták

Laughinghouse

Bell

2020

Water

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Harmful algal blooms have increased globally with warming of aquatic environments and increased eutrophication. Proliferation of cyanobacteria (blue-green algae) and the subsequent flux of toxic extracellular microcystins present threats to public and ecosystem health and challenges for remediation and management. Although methods exist, there is currently a need for more environmentally friendly and economically and technologically feasible sorbents. Biochar has been proposed in this regard because of its high porosity, chemical stability, and notable sorption efficiency for removing of cyanotoxins. In light of worsening cyanobacterial blooms and recent research advances, this review provides a timely assessment of microcystin removal strategies focusing on the most pertinent chemical and physical sorbent properties responsible for effective removal of various pollutants from wastewater, liquid wastes, and aqueous solutions. The pyrolysis process is then evaluated for the first time as a method for sorbent production for microcystin removal, considering the suitability and sorption efficiencies of pyrolysed materials and biochar. Inefficiencies and high costs of conventional methods can be avoided through the use of pyrolysis. The significant potential of biochar for microcystin removal is determined by feedstock type, pyrolysis conditions, and the physiochemical properties produced. This review informs future research and development of pyrolysed materials for the treatment of microcystin contaminated aquatic environments.

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Removal of microcystin-LR from drinking water using a bamboo-based charcoal adsorbent modified with chitosan

Cited by 36 publications

References 33 publications

How do the HSDM and Boyd’s model compare for estimating intraparticle diffusion coefficients in adsorption processes

How do the HSDM and Boyd’s model compare for estimating intraparticle diffusion coefficients in adsorption processes

Removal Cyanobacteria by Diatomite Filter from Raw Freshwater and Potential Use in Watering Domestic Animals

The Use of Biochar and Pyrolysed Materials to Improve Water Quality through Microcystin Sorption Separation

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