Green Synthesis of Magnetic Adsorbent Using Groundwater Treatment Sludge for Tetracycline Adsorption

Green Synthesis of Magnetic Adsorbent Using Groundwater Treatment Sludge for Tetracycline

Adsorption

Zhan Qu; Yaqiong Wu; Suiyi Zhu; Yang Yu; Mingxin Huo; Leilei Zhang; Jiakuan Yang; Dejun Bian; Yi Wang

【期刊名称】《工程（英文）》 【年(卷),期】2019(005)005

【摘要】Groundwater treatment sludge is an industrial waste that is massively produced from groundwater treatment plants.Conventional methods for treatment of this sludge,such as discharge into deep wells or

the

sea,or

disposal

at

landfills,are

not

environmentally

sustainable.Here,we demonstrate an alternative strategy to recycle the sludge by preparing a magnetic maghemite adsorbent via a one-step hydrothermal method with NaOH solution as the only solvent.With this method,the

weakly

other

magnetized

sludge,which

contained

33.2%iron(Fe)and impurities(e.g.,silicon(Si),aluminum(Al),and

manganese(Mn)),was converted to magnetic adsorbent(MA)with the dissolution of Si/Al oxides(e.g.,quartz and albite)into the liquid fraction.At a NaOH concentration of 2 mol L^-1,approximately 18.1%of the ferrihydrite in the Fe oxides of the sludge was converted into 11.2%maghemite

and

6.9%hematite produced

by

after a

2

the mol

hydrothermal L^-1

NaOH

treatment.MA2(i.e.,MA