Adsorption Study of Arsenic Removal by Novel Hybrid Copper Impregnated Tufa Adsorbents in a Batch System

Abstract

Performance of a novel adsorbent, copper impregnated natural mineral tufa (T-Cu), applicable for efficient arsenic removal is presented in this study. Testing of adsorbent properties encompassed material characterization and equilibrium study in a batch system. Copper modification contributed to increased adsorption capacities, that is, from 4.65 to 67.83 mg g À1 for As(III), and from 6.84 to 104.62 mg g À1 for As(V), comparing to unmodified tufa. The obtained thermodynamic data indicated higher feasibility and spontaneity of the adsorption process at higher temperature. A competitive study in a multi-component system showed that T-Cu adsorbents effectively removed arsenic species at high concentrations of interfering ions. The high adsorption capacity and multi-cycle reusability gave positive techno-economic indicators in comparison to commercial adsorbents.

Removal of heavy metals from water using multistage functionalized multiwall carbon nanotubes

“…Taking all this into consideration, adsorption is one of the most rewarding and the most commonly used methods in the study of new materials and the conditions for the removal of heavy metals from water. [1][2][3][4][5][6][7] Development and application of new nanostructured materials, including carbon nanotubes, in the field of water treatment has enabled the development of various combinations of modification and functionalization in order to synthesize a high-capacity adsorbents with the possibility of multiple applications, minimal environmental impact and also to satisfy profitability regarding their possible use. Regardless of enormous effort performed by scientific community directed toward this goal, the published results did not provide satisfactory technology/material which could satisfy established criteria.…”

Primena elektrofilterskog pepela modifikovanog sa cementom za uklanjanje arsena iz vodenih rastvora

“…ΔSº) ukazujne na težnju stvaranja neuređenog sistema na granici faza između MFAC i rastvora As(V), kao i na mogućnost promena strukture površine adsorbenta. Promena vrednosti entalpije može ukazati na prirodu mehanizma adsorpcije[10], prema čemu dobijena vrednost ukazuje na fizičku adorpciju. ΔHº) ukazuje da je adsorpcija na MFAC endoterman proces.…”

“…Pozitivna vrednosti entropije (ΔSº) ukazujne na težnju stvaranja neuređenog sistema na granici faza između MFAC i rastvora As(V), kao i na mogućnost promena strukture površine adsorbenta. Promena vrednosti entalpije može ukazati na prirodu mehanizma adsorpcije[10], prema čemu dobijena vrednost ukazuje na fizičku adorpciju.Na slici 1. prikazani su difraktogrami XRD analize adsorbenata. Struktura materijala je heterogena, dominantan je sadržaj silicijuma (α-SiO 2 ), kalcijum natrijum aluminijum silikat-Ca 0.8 Na 0.2 Al 1.8 Si 2.2 O 8 Ca 0.8 , hematit-Fe 2 O 3 , magnezijum alumnijum gvožđe oksid-MgAl 0.8 Fe 1.2 O 4 , kalijumoksid-KO 2 , kalcijum karbonat CaCO 3 i mulit-syn-Al(Al 0.83 Si 1.8 O 4.85 ).…”