Method for preparing quaternary ammonium salt cationic absorbing agent by using manioc straw/ manioc waste and application

[0027] Embodiment 1: the preparation of quaternary ammonium salt cationic adsorbent

[0028] Wash cassava stalks, dry, crush, take 10g of powder with a particle size of 80 mesh, soak and stir in 2mol / L NaOH 200ml for 10h, filter, wash until neutral, and dry; weigh 2g of the dried product and put it into 50ml of epoxy chlorine Propane and 50ml N,N-dimethylformamide, stirred at 100°C for 1h; then added 3ml of ethylenediamine, stirred at 100°C for 0.5h; added 5ml of triethylamine, stirred at 100°C for 4h; NaOH, HCl, 50% ethanol, and distilled water were washed until neutral, and dried to obtain 1.8 g of quaternary ammonium salt cationic adsorbent. The appearance is yellow powder, the Zeta potential is 42, and the pH value of the aqueous solution is 5.8.

[0029] Embodiment 2: Preparation of quaternary ammonium salt cationic adsorbent

[0030]Wash cassava stalks, dry them, crush them, take 15g of powder with a particle size of 80 mesh, soak and stir in 200ml of 3mol / L NaOH for 8h, filter, wash until neutral, and dry; weigh 2g of the dried product and put it into 50ml of epoxy chlorine Propane and 50ml N,N-dimethylformamide, stirred at 100°C for 1h; then added 4ml of ethylenediamine, stirred at 100°C for 0.5h; added 10ml of triethylamine, stirred at 100°C for 4h; NaOH, HCl, 50% ethanol, and distilled water were washed to neutrality, and dried to obtain 1.9 g of cationic adsorbent. The appearance is yellow powder, the Zeta potential is 35, and the pH value of the aqueous solution is 4.9.

[0031] Embodiment 3: Preparation of quaternary ammonium salt cationic adsorbent

[0032] Wash cassava stalks, dry them, crush them, take 12g of powder with a particle size of 80 mesh, soak and stir in 200ml of 2mol / L NaOH for 8h, filter, wash until neutral, and dry; weigh 2g of the dried product and put it into 40ml of epoxy chlorine Propane and 40ml N,N-dimethylformamide, stirred at 50°C for 1.5h; then added 5ml of ethylenediamine, stirred at 50°C for 1.5h; added 5ml of triethylamine, stirred at 50°C for 3h; at room temperature, respectively Wash with NaOH, HCl, 50% ethanol, and distilled water until neutral, and dry to obtain 1.8 g of cationic adsorbent. The appearance is yellow-brown powder, the Zeta potential is 33, and the pH value of the aqueous solution is 5.2.