| The safety of drinking water is closely related to human health.With the discovery of disinfection by-products in drinking water,low-dose and highly toxic pollutants have been widely concerned,such as heavy metals leaching from pipeline and inorganic ions.These contaminants are hardly to be removed by traditional biological treatment due its biotoxicity and low concentration.Therefore,exploration for the cost-effective method of simultaneous removal of multiple pollutants is one of the hot spot of current research.In this paper.NO3--N,TCM,Cu(?)are selected to represent inorganic salts,small molecule organic matter and heavy metal ions as target pollutants.At normal temperature and pressure,four kinds of cheap bimetal alloys with practical application potential:Al-Mg50,Al-Cu50,Al-Fe50 and Al-Ni50 were used to simultaneously remove target pollutants by mixing experiments.For Al-Mg50,the NO3--N and Cu(II)can be removed completely within the reaction time of 48 h while the removal efficiency of TCM is only 39.1%.There is no lag phase during the removal process using Al-Mg50.Al-Cu50,Al-Fe50 and Al-Ni50 can achieve the complete removal of Cu(II),N03--N and TCM within 48 h.However,all of them have a lag phase in the removal process.As for the end products analysis,there is nitrogen loss in end products of NO3--N using Al-Cu50,Al-Ni50 and Al-Fe50.When the adsorption effect is ignored,Al-Fe50 could achieve the highest N2 selectivity(19.6%)and its solution is the most clarified after the reaction with the minimum metal ion leaching.In order to further compare the capability of the four Al-based alloy,Al-Mg50,Al-Cu50,Al-Fe50 and Al-Ni50 Al and Al-Fe alloys with different Al,Fe ratio were designed to react with H20 to produce H2.The relationship between hydrogen production and removal results was discussed.By comparing different alloys' capability of hydrogen production,combined with XRD and SEM characterization,the effects and mechanism of the removal of target pollutants by different alloys were discussed and explained.The results showed that the trend of the removal curve of N03'-N and TCM is consistent with the trend of hydrogen analysis correspondingly.Al-Fe alloy was further explored.Al-Fe alloy with different Al,Fe ratio(Fe weight:10%,20%,50%,58%)were used to treat target pollutants.The results showed that the removal trend of NO3--N,Cu(II)and TCM was quite similar while the N2 selectivity increased with the increase of Fe ratio.For Al-Fe alloys,the higher the Fe ratio is,the lower the hydrogen production is,but the N2 selectivity is higher.Thusly it is inferred that Al-Fe alloys' catalytic performance is better than the reduction performance.To further discover the link between the hydrogen production rate and the removal efficiency of target pollutants,Al-Fe 10 alloys with hydrogen production rate were used to treat mixed pollutants.The results showed the hydrogen production rate of Al-Fe10 was faster,the Cu(?),NO3--N and TCM removal rate were faster,and the N2 selectivity was higher.Finally,Al-Fe10 was used to remove single,two-mixed and three-mixed target pollutants respectively,the results showed that the existence of NO3--N or TCM posed obvious inhibitory effect of for Cu(?)reduction process.When NO3--N and TCM were co-exist,the inhibition is the severest. |
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