Abstract
In present study, the biosorption process of Cu(II) onto aerobic granular sludge-derived biochar was evaluated in the absence and presence of effluent organic matter (EfOM) by using batch and fluorescence approaches. It was found that EfOM gave rise to enhancement of Cu(II) removal efficiency onto biochar, and the sorption data were better fitted with pseudo-second order model and Freundlich equation, in despite of the absence and presence of EfOM. According to excitation-emission matrix (EEM), EfOM was mainly comprised by humic-like substances and fulvic-like substances and their intensities were reduced in the addition of biochar and Cu(II) from batch biosorption process. Synchronous fluorescence spectra coupled to two-dimensional correlation spectroscopy (2D-COS) further implied that a successive fluorescence quenching was observed in various EfOM fractions with the increasing Cu(II) concentration. Moreover, fulvic-like fraction was more susceptibility than other fractions for fluorescence quenching of EfOM.
Highlights
With the rapid development of the economy, a great number of industries, such as metallurgy, machinery manufacturing, chemical, electronics, textile, instrument and printing etc., produce and discharge hazardous wastes based various heavy metals into the environment
The physical and chemical characteristics of prepared aerobic granular sludge (AGS)-BC were observed by using BET, Fourier Transform infrared spectroscopy (FTIR) spectra, SEM and Zeta potential
It was found that BJH desorption cumulative volume of pores and BET surface area of biochar were 0.6985 cm3/g and 1175.1 m2/g, respectively
Summary
With the rapid development of the economy, a great number of industries, such as metallurgy, machinery manufacturing, chemical, electronics, textile, instrument and printing etc., produce and discharge hazardous wastes based various heavy metals into the environment. The increasing heavy metal pollution has become one of the most worldwide environmental problems facing humanity, which brings about serious water pollution, threatens human health and ecosystem (Wang and Chen, 2009). Due to their non-degradable, accumulation and persistent characteristics, the removal and elimination of toxic metal ions from contaminated water is significant necessary prior to discharge into receiving water. Numerous methods have been proposed for efficient heavy metal removal from aqueous solution, including chemical precipitation, ion exchange, adsorption, membrane filtration and electrochemical technologies etc. Kołodyńska et al (2017) compared the sorption performance of Cu(II), Zn(II), Cd(II), Co(II) and Pb(II) by using commercial activated carbon and biochar, suggesting that heavy metal ions were removed more efficiently through biochar than activated carbon
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