Modified Bamboo Charcoal Loading Fe/Cu To Remove Chloramphenicol In Wastewater

Low-cost and renewable adsorbent of bamboo charcoal (BC) was modified withNaOH and ethanol in this study. In order to acquire a high chloramphenicol (CAP)sorption performance, the bamboo charcoal was modified. Combined with the techniqueof Zero-Valent Iron (ZVI), iron/copper bimetallic nanoparticles were loaded on the surfaceof modified bamboo charcoal (MBC), to obtain an efficient MBC/Fe/Cu system. ThisMBC/Fe/Cu system can not only adsorb CAP but also can degrade CAP simultaneity, withenhancing the CAP removal efficiency. The main results of this study are shown asfollows:(1) Whether BC, NaOH modified BC or ethanol modified BC followedpseudo-fist-order reaction, but only ethanol modification enhanced the equilibriumadsorption capacity of CAP. Langmuir adsorption equation can describe all three CAPisothermal adsorption well. BET characterization shows that both modifications causedcollapse in the structure of BC, which is unfavorable for adsorption. However, bothmodifications increased surface oxygen-containing groups, as Boehm method, FTIR andXPS characterization shows. Most of them were hydrophilic groups, which played animportant role in CAP adsorption.(2) MBC was composited incorporated with Fe/Cu. The characterization ofMBC/Fe/Cu and the experiment of its removal of CAP were carried out, in order to get thebest ratio of MBC/Fe/Cu. Its removal of CAP matched pseudo-fist-order reaction well.The equilibrium adsorption capacity of MBC/Fe/Cu was increased to0.895mg/g, andhalf-reaction time reached only69.87min. Not only the reaction rate was improved byFe/Cu loading, but also the removal efficiency. However, some Fe/Cu nanoparticles werefound gathered together in image of TEM, which would slow the reaction down.(3) The research showed that pH value effected the removal of CAP by MBC/Fe/Cugreatly, and the optimum range of pH value is4~6. However, variation of reactiontemperature had little difference in CAP removal.20~30℃was recommended accordingto room temperature. Removal of CAP by MBC/Fe/Cu fitted Langmuir isothermal equation well. Compared with MBC, MBC/Fe/Cu had merely enhanced the capacity ofCAP removal, but not the interaction between CAP and MBC.