Tetracycline absorbed onto nitrilotriacetic acid-functionalized magnetic graphene oxide: Influencing factors and uptake mechanism.
A novel magnetic nanomaterial was synthesized by grafting nitrilotriacetic acid to magnetic graphene oxide (NDMGO), which was applied as an adsorbent for removing tetracycline (TC) from aqueous solutions. The nanomaterial was characterized using TG-DTA, SEM, TEM, XRD, VSM, XPS, Raman, BET surface area and zeta potential measurements. Several experimental conditions (solution pH, adsorption time, temperature, ionic strength and foreign ions) affecting the adsorption process were investigated. The results showed that the TC adsorption capacity could be affected by solution pH. The adsorption capacity of TC increased rapidly in the initial 20min and finally reached equilibrium was about 600min. The pseudo-second-order kinetics provided the better correlation for the experiment data. Various thermodynamic parameters indicated that the adsorption was a spontaneous and endothermic process. The presence of NaCl and background electrolytes in the solution had a slight influence on TC adsorption. Hydrogen bonds, amidation reaction, π-π and cation-π interaction between NDMGO and TC could be used to explain the adsorption mechanism. The regeneration experiment demonstrated that this nanomaterial possessed an excellent regeneration performance. Based on the experimental results and comparative analysis with other adsorbents, the NDMGO was a high-efficiency and reusable adsorbent for TC pollution control.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Mei-Fang
MF
Li
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China. Electronic address: liuyunguo_hnu@163.com.
Yun-Guo
YG
Liu
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Guang-Ming
GM
Zeng
School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.
Shao-Bo
SB
Liu
College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China; College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China.
Xin-Jiang
XJ
Hu
Light Alloy Research Institute, Central South University, Changsha 410083, PR China.
Ding
D
Shu
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Lu-Hua
LH
Jiang
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Xiao-Fei
XF
Tan
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Xiao-Xi
XX
Cai
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Zhi-Li
ZL
Yan
D000327:Adsorption; D017743:Equipment Reuse; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D009571:Nitrilotriacetic Acid / Q000737:chemistry*; D009994:Osmolar Concentration; D010087:Oxides; D012965:Sodium Chloride / Q000737:chemistry; D013696:Temperature; D013752:Tetracycline / Q000302:isolation & purification*; D013816:Thermodynamics; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
D006108:Graphite; D058185:Magnetite Nanoparticles; D009571:Nitrilotriacetic Acid; D010087:Oxides; D012965:Sodium Chloride; D013752:Tetracycline; D062065:Wastewater; D014874:Water Pollutants, Chemical
Adsorption mechanism; Background electrolytes; Ionic strength; Magnetic graphene oxide; Nitrilotriacetic acid; Tetracycline