Implementation of Modified Acacia Tannin by Mannich Reaction for Removal of Heavy Metals (Cu, Cr and Hg)

Abstract

The modified tannin by Mannich reaction was investigated for wastewater treatment. The removal of heavy metals, such as copper, chromium and mercury, in industrial wastewater was evaluated through the coagulation–flocculation technique, using modified Acacia tannin (MAT) as a coagulant agent. The successful tannin modification was evaluated by infrared spectopometry (FTIR), nuclear magnetic resonance (NMR); monitoring the removal of heavy metals was performed by atomic absorption (AA) and a direct mercury analyzer (DMA). Additionally, the parameters of water quality, total suspended solids (TSS), turbidity and chemical oxygen demand (COD) were assessed. Different doses of MAT were evaluated (375 ppm, 750 ppm, 1250 ppm and 1625 ppm) and three different levels of pH (4, 7 and 10). The highest percentages of removal obtained were copper 60%, chromium 87%, mercury 50%–80%, COD 88%, TSS 86% and turbidity 94%, which were achieved with the dose of 375 ppm of MAT at pH 10. The coagulation–flocculation process with the modified Acacia tannin is efficient for the removal of conventional parameters and for a significant removal of the metals studied.

Etilendiamin Modifiye Edilmiş Valonya Tanin Polimeri Sentezi

“…1744 cm -1 'de görülen pik valonya taninin karboksil ve karbonil gruplarına ait piktir [4]. 1624 cm -1 ve 1469 cm -1 'deki pikler, aromatik halkadaki C=C bağının germe titreşiminin karakteristik pikleridir [18,19]. Diğer bir yandan 1469 cm -1 'deki pik, tanin içeriğindeki şekerin metilen köprü yapılarının makaslama titreşiminin bir göstergesidir.…”

Synthesis of Quaternary Ammonium Tannin from Paper Mill Wastewater for Application in Water Treatment

“…tăng từ 21,48% lên 92,73%, đối với ion Cd 2+ hiệu suất xử lý tăng từ 11,3% lên 75,75%, khi hàm lượng amoni tanin bậc 4 tăng từ 0,5% lên 1%. So sánh với kết quả nghiên cứu của Lugo [12] cho hiệu suất xử lý đối với ion Cu 2+ là 50,59%, Cr 3+ là 69,5% và Hg 2+ là 38,59% và kết quả nghiên cứu của Amuda [2] khi sử dụng polyaluminum clorit (PAC) làm chất keo tụ trong sự có mặt của bentonite cho hiệu suất xử lý loại bỏ tới 78% và 69% tương ứng đối với ion Pb 2+ và Cd 2+ , kết quả thu được là khá tương đồng.…”

Removal of leachate pollutants using flocculation method at simultaneous factors of optimum pH and Tacca leontopetaloides biopolymer flocculant (TBPF) dosage via face‐centred central composite design

“…Integrated biopolymers like tannin (Lugo et al, 2020), starch (Oladoja, 2016), chitosan (Sun et al, 2019), gums (Mukherjee et al, 2018) and cellulose (Zhu et al, 2016) have been used in flocculation for particulate and heavy metal removal. These intergrated biopolymer flocculants are harmful to human because it produced unreacted chemicals which synthesize the monomer units when it being used (Lee et al, 2014; Wu et al, 2012) and it require long processing time to prepare.…”