التفاصيل البيبلوغرافية
| العنوان: |
A Comparison among Synthetic Layered Double Hydroxides (LDHs) as Eective Adsorbents of Inorganic Arsenic from Contaminated Soil–Water Systems |
| المؤلفون: |
Pigna M., Violante A., Caporale A. G. |
| المساهمون: |
Pigna, M., Violante, A., Caporale, A. G. |
| سنة النشر: |
2020 |
| المجموعة: |
IRIS Università degli Studi di Napoli Federico II |
| مصطلحات موضوعية: |
Inorganic arsenic contamination, layered double hydroxide, arsenate, arsenite, adsorption, Langmuir isotherm, competing anion, adsorption inhibition, kinetics of desorption, phosphate |
| الوصف: |
The need for cost-effective adsorbents of inorganic arsenic (As(III) and As(V)) stimulates the academia to synthesize and test novel materials that can be profitably applied at large-scale in most affected areas worldwide. In this study, four different layered double hydroxides (Cu-Al-, Mg-Al-, Mg-Fe- and Zn-Al-LDH), previously synthesized and studied for As(III) removal capacity, were evaluated as potential adsorbents of As(V) from contaminated systems, in absence or presence of common inorganic anions (Cl−, F−, SO42−, HCO3− and H2PO4−). The As(V) desorption by H2PO4- was also assessed. Lastly, the As(V) adsorption capacities of the four layered double hydroxides (LDHs) were compared with those observed with As(III) in a complementary paper. All the LDHs adsorbed higher amounts of As(V) than As(III). Fe-Mg-LDH and Cu-Al-LDH showed higher adsorption capacities in comparison to Mg-Al-LDH and Zn-Al-LDH. The presence of competing anions inhibited the adsorption of two toxic anions according to the sequence: Cl− < F− < SO42− < HCO3− < < H2PO4−, in particular on Mg-Al-LDH and Zn-Al-LDH. The kinetics of As(V) desorption by H2PO4− indicated a higher occurrence of more easily desorbable As(V) on Zn-Al-LDH vs. Cu-Al-LDH. In conclusion, synthetic Cu- and Fe-based LDHs can be good candidates for an efficient removal of inorganic As, however, further studies are necessary to prove their real feasibility and safety. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/wos/WOS:000551259000007; volume:4; issue:37; firstpage:1; lastpage:12; numberofpages:12; journal:SOIL SYSTEMS; http://hdl.handle.net/11588/810410; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85094643472 |
| الاتاحة: |
http://hdl.handle.net/11588/810410 |
| Rights: |
info:eu-repo/semantics/openAccess |
| رقم الانضمام: |
edsbas.C7A95CD0 |
| قاعدة البيانات: |
BASE |