纳米零价铝活化过硫酸盐降解卡马西平

Nanoscale zero-valent aluminum activates persulfate to degrade Carbamazepine

通过液相还原法合成了粒径在100~200 nm之间的类球形纳米零价铝(nZVAl)颗粒.合成的nZVAl能在较广的pH范围(2.5~10)内有效活化过硫酸盐(PS)降解卡马西平(CBZ).结果表明:在初始pH=3,PS浓度为0.5 mmol·L^(-1),nZVAl质量浓度为0.15g·L^(-1)条件下反应30 min后,CBZ的去除率达到94.3%,优于商品铝粉;PS浓度上升会促进nZVAl的腐蚀,提高CBZ的降解效率;SO_(4)^(2-)腐殖酸(HA)的存在会抑制CBZ的降解效率,而Cl^(-)的存在显著促进CBZ降解;nZVAl/PS体系中产生的SO_(4)^(·-)是降解CBZ的主要活性自由基;X射线光电子能谱(XPS)分析表明Al^(0)是nZVAl中活化PS的主要成分,并且nZVAl表面氧化层钝化为Al_(2)O_(3)是反应后续降解效率降低的主要原因.

Nanoscale zero-valent aluminum(nZVAl)was used to activate persulfate(PS)to degrade carbamazepine(CBZ)in a wide pH(2.5~10),which was synthesized by liquid-phase method were sphere-like aluminum particles of which size is about 100-200 nm.Results shows that CBZ removal rate could reach 94.3%in 30 min under the condition of 0.15 g·L^(-1)nZVAl,0.5 mmol·L^(-1)PS and initial pH=3,which is significantly better than commercial aluminum powder.Increasing PS concentration could accelerate corrosion of nZVAl and improve the degradation efficiency of CBZ;The performance was reduced by SO_(4)^(2-)and humic acid(HA),while promoted by Cl^(-).SO_(4)^(·-)induced by nZVAl/PS system was the main reactive free radical for CBZ degradation.According to Xray photoelectron spectroscopy(XPS)analysis,Al^(0)was the major component of nZVAl for PS activation,and formation of surface passivation layer(Al_(2)O_(3))was the main reason for decrease in the degradation efficiency of subsequent reaction.