Adsorption characteristics and mechanisms of ofloxacin-Cu by activated carbon based on long-root <i>Eichhornia crassipes</i>

• Main Authors: CHEN Xin, WEI Zhi-yuan, ZHAO Han-bin, WU Guang-zhe, LIU Li-li
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2020-01-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: long-root <i>eichhornia crassipes</i>, activated carbon, ofloxacin, cu, combined pollution, adsorption
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2020/1/20200108.htm
• ISSN: 2095-6819; 2095-6819

In order to solve the problem of combined antibiotics and heavy metal pollution, long-root <i>Eichhornia crassipes</i>-activated carbon (LREC-AC)was used to adsorb ofloxacin(OFL) and Cu²⁺ in aqueous system. Multiple experiments were conducted to investigate the adsorption characteristics and mechanisms of LREC-AC for OFL and Cu²⁺. Both the adsorption of OFL and Cu²⁺ by LREC-AC conformed to the Langmuir and pseudo-second-order model. Multiple mechanisms co-existed in the absorption of OFL and Cu²⁺ by LREC-AC. The adsorption mechanism of OFL by LREC-AC included electron-donor-acceptor interaction, hydrogen bonds, and electrostatic attraction, while the adsorption mechanism of Cu²⁺ included electrostatic attraction and electronic exchange or covalent bonds. On this basis, the adsorption characteristics and mechanisms of OFL and Cu²⁺ by LREC-AC in a compound system were further investigated. The saturated adsorption capacities in the compound system were 59.34 mg&#183;g^-1 and 37.46 mg&#183;g^-1 for OFL and Cu²⁺, respectively. In addition, OFL concentration of 10 mg&#183;L^-1, Cu²⁺(<2 mg&#183;L^-1) promoted the adsorption of OFL by LREC-AC because of the complexation of Cu²⁺ and OFL. LRECAC can effectively remove OFL and Cu²⁺ from aqueous system through a variety of adsorption mechanisms. At the same time, LREC-AC has good adsorption performance for combined heavy metal and antibiotics pollution.