Removal characteristics of heavy metals chelating agent N,N-bis(dithiocarboxy) ethylenediamine (EDTC) for synergistic treatment of EDTA-Cu/RhB

Abstract

In this work, the heavy metal chelating agent N, N-bis(dithiocarboxy) ethylenediamine (EDTC) was synthesized by blending method with ethylenediamine (C2H8N2) and carbon disulfide (CS2). The effects of material ratio, dosing sequence, pH and temperature in aqueous solution on the removal characteristics of EDTC as a synergistic agent for the treatment of complexed copper (EDTA-Cu) and Rhodamine B (RhB) were investigated. Furthermore, the removal efficiency was compared with those of single-component EDTA-Cu and RhB systems. The results indicated that the removal of EDTA-Cu and RhB was up to 150 mg/g and 850 mg/g, respectively, when 1.3 g/L EDTC was added to 180 mg/L EDTA-Cu and 1 800 mg/L RhB water at room temperature. The treatment efficiency was stable in the pH range of 2-10 in aqueous solution. Compared with the removal effect of single component EDTA-Cu and RhB treated with EDTC, EDTC can effectively simultaneous remove copper and RhB with synergistic effect. Therefore, EDTC can be applied as a water treatment agent for the synergistic treatment of complex metal and dye in complicated wastewater.

Keywords

• heavy metal chelating agent
• chelated copper
• rhodamin b
• binary system
• removal characteristics