ตัวดูดซับที่เตรียมจากดินเหนียวและกากขี้แป้งของโรงงานน้ำยางข้นเพื่อการดูดซับตะกั่วและแคดเมียมในน้ำเสียสังเคราะห์ / เกสินนี ตันติสุวรรณกุล = Adsorbent prepared by clay and lutoid of rubber latex industry for lead and cadmium adsorption in systhetic wastewater / Kaesinee Tontisuwannagul
The propose of the research was to study the possibility for preparation of adsorbent from clay mixed with lutoid of rubber latex industry for lead and cadmium. Adsorption which produce by optimum ratio of clay to lutoid, optimum pH, optimum contact time, adsorption isotherm, leaching ion by distilled water and 5%HC1 solution, searching capacity of adsorbent column and study physical feature and chemical feature. Comparing adsorbent behavior between commercial activated carbon and adsorbent that was produced. The resulting experiment was aimed to study a process of adsorbent production by varying ratio between clay and lutoid and pyrolysis temperature. The results showed the adsorbent under the condition that can be adsorbed lead and cadmium and static the ratio of clay to lutoid 40 : 60 (5AC60) for lead and 20 : 80 (5AC80) for cadmium at pyrolysis temperature of 500° c for 2 hours which adsorb at 88.26 % for lead and 97.23 % for cadmium. The experiment for studying the efficiency of adsorbent showed that the suitable adsorbing conditions were at of 2 hours and pH 3 for lead and at pH 4 for cadmium. Adsorption isotherm both lead and cadmium were followed fruendlich equation. The maximum adsorption capacity of adsorbent 5AC60 and 5AC80 were 42.098 mg/g and 47.195 mg/g, respectively. However, the commercial activated carbon showed the maximum adsorption capacity at 51.548 mg/g for lead and 177.17 mg/g for cadmium. The study of adsorbent leaching with distilled water and 5 % HC1 solution showed that the lead and cadmium were able to leach are 1.13% and 0.17 %, respectively by distilled water and 27.49% and 14.58%, respectively by 5 % HC1 solution. In continuous experiment, the efficiency of adsorbents for lead and cadmium removal was investigated using pH 3 for lead and pH 4 for cadmium. The amounts in solution were 1 ppm. The Results indicated that the breakthrough volumes at the adsorbent depth of 30, 60, 90 cm. were respectively 3,510.20, 2,265.30, 2,049.77 BV for lead and respectively 7,142.86, 5,040.82 3,783.91 BV for cadmium.
