TY - JOUR
T1 - Arsenate removal using titanium dioxide-doped cementitious composites
T2 - Mixture design, mechanisms, and simulated sewer application
AU - Liu, Zhuo
AU - Shi, Qiantao
AU - Bao, Yi
AU - Meng, Xiaoguang
AU - Meng, Weina
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1/1
Y1 - 2023/1/1
N2 - Arsenate (As(V)) in municipal wastewater leads to a public health problem due to its contamination of natural water sources. Here, we proposed to use sewer pipe made of TiO2-doped cementitious composite (TCC) for As(V) removal from municipal wastewater. The optimum composition of TCC, the performance for As(V) removal in the simulated sewer system, and the molecular-level As(V) removal mechanisms were investigated. To obtain the optimum composition, variables were adjusted to maximize the As(V) removal using TCC. Results show that the TiO2 and water contents were the dominant factors. Simulated sewer pipes made of TCC removed As(V) from 100 μg/L to <10 μg/L, which performed better than plain cementitious composite. Moreover, extended X-ray absorption fine structure (EXAFS) analysis indicates that both precipitation and adsorption contribute to the As(V) removal by TCC, while the adsorption is more significant with a lower As(V) concentration (i.e., 1 mg/L). This is the first study evaluating the feasibility to apply TCC for As(V) removal from sewer wastewater. The optimized composition, simulation results, and molecular-level mechanism gained from this study are useful to the future design of TCC for As(V) removal, especially for sewer systems.
AB - Arsenate (As(V)) in municipal wastewater leads to a public health problem due to its contamination of natural water sources. Here, we proposed to use sewer pipe made of TiO2-doped cementitious composite (TCC) for As(V) removal from municipal wastewater. The optimum composition of TCC, the performance for As(V) removal in the simulated sewer system, and the molecular-level As(V) removal mechanisms were investigated. To obtain the optimum composition, variables were adjusted to maximize the As(V) removal using TCC. Results show that the TiO2 and water contents were the dominant factors. Simulated sewer pipes made of TCC removed As(V) from 100 μg/L to <10 μg/L, which performed better than plain cementitious composite. Moreover, extended X-ray absorption fine structure (EXAFS) analysis indicates that both precipitation and adsorption contribute to the As(V) removal by TCC, while the adsorption is more significant with a lower As(V) concentration (i.e., 1 mg/L). This is the first study evaluating the feasibility to apply TCC for As(V) removal from sewer wastewater. The optimized composition, simulation results, and molecular-level mechanism gained from this study are useful to the future design of TCC for As(V) removal, especially for sewer systems.
KW - Adsorption
KW - Arsenate
KW - Cementitious composite
KW - Precipitation
KW - TiO
UR - http://www.scopus.com/inward/record.url?scp=85138109228&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85138109228&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2022.158754
DO - 10.1016/j.scitotenv.2022.158754
M3 - Article
C2 - 36113790
AN - SCOPUS:85138109228
SN - 0048-9697
VL - 854
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 158754
ER -