NDLI: Removal of Arsenic(v) ion from Aqueous solutions by basic Lanthanum Carbonate

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Removal of Arsenic(v) ion from Aqueous solutions by basic Lanthanum Carbonate

Content Provider	Semantic Scholar
Author	Haron, Jelas Yunus, Wan Sukari, Mohd. Aspollah Hj. Tokunaga, Shuzo Wasay, S. A.
Copyright Year	2001
Abstract	A new adsorption process for the removal of As(V) ion from aqueous solutions has been studied using basic lanthanum carbonate (BLC). The compound was effective in removing As(V) ion and decreased its concentration down to < 0.001 mM. The dissolution of BLC was appreciable at initial pH < 4. Kinetic study showed that the As(V)removal was a first- order reaction and the rate constants were varies from 1.8 down to 0.005 h -1 in acidic and alkaline pH, respectively. The As(V)removal was highly pH-dependent and the optimum pH range was 2-6. The following two mechanisms of removal are proposed: (i) adsorption by exchange of CO3 2 - and OH - groups with As(V) ions in the alkaline to mild acidic pH range where BLC does not dissolve and (ii) precipitation of insoluble lanthanum arsenate in the acid pH range where BLC dissolves. Abstrak. Satu proses penjerapan baru untuk penyingkiran ion As(V) daripada larutan akueus telah dikaji menggunakan lantanum karbonate berbes (BLC). Sebatian ini didapati berkesan untuk menyingkirkan ion As(V) dan dapat menurunkan kepekatanya dibawah 0.001 mM. Pelarutan BLC didapati hanya berlaku apabila pH awal larutan < 4. Kajian kinetik menunjukkan penyingkiran arsenik adalah menurut tindak balas order pertama dengan pemalar kadar berubah daripada 1.8 h - 1 pada pH berasid dan turun kepada 0.005 h - 1 dalam keadaan berbes. Penyingkiran ini sangat bergantung kepada nilai pH dengan pH optimumnya antara 2 hingga 6. Dua mekanisma berikut dicadangkan bagi penyingkiran ini: (i) jerapan melalui penukaran As(V) dengan kumpulan CO3 2 - dan kumpulan OH - pada julat pH beralkali dan bersid sederhana dimana BLC tidak melarut dan (ii) pemendakan lantanum arsenat pada julat pH berasid dimana BLC melarut.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.ukm.my/mjas/v7_n1/26-jelas173.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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