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Abstract
To effectively remove dissolved organic matter (DOM) from actual biotreated coking
wastewater (BTCW), a reusable and low-cost chitosan-biochar (CB) was prepared. From
the results, CB (52%) exhibited superior removal efficiency compared to that of biochar
(12%) and a faster adsorption rate. Analysis of the DOM fractions, molecular weight
distribution, fluorescent components, and molecular compositions indicated that chitosan
modification made more kinds of DOM components (e.g., hydrophilic substances) have
an affinity with biochar. The material characterization and removal characteristics
jointly proved that the adsorption efficiency was promoted by the change in pore size
distribution and increase in functional groups that provide bonding sites for DOM
via hydrogen bonding, acid-base reactions, and electrostatic interactions. Moreover,
compared to traditional adsorbent activated carbon, CB exhibited superior removal
efficiency and cost-effectiveness. These results demonstrated that CB is a potential
alternative adsorbent for advanced DOM treatment of BTCW.