tetracycline and acetylcellulose

The over-reliance on tetracycline antibiotics (TC) in the animal husbandry and medical field has seriously affected the safety of the ecological environment. Therefore, how to effectively treat tetracycline wastewater has always been a long-term global challenge. Here, we developed a novel polyethyleneimine (PEI)/Zn-La layered double hydroxides (LDH)/cellulose acetate (CA) beads with cellular interconnected channels to strengthen the TC removal. The results of the exploration on its adsorption properties illustrated that the adsorption process exhibited a favorable correlation with the Langmuir model and the pseudo-second-order kinetic model, namely monolayer chemisorption. Among the many candidates, the maximum adsorption capacity of TC by 10 %PEI-0.8LDH/CA beads was 316.76 mg/g. Apart from that, the effects of pH, interfering species, actual water matrix and recycling on the adsorption of TC by PEI-LDH/CA beads were also analyzed to verify their superior removal capability. The potential for industrial-scale applications was expanded through fixed-bed column experiments. The proven adsorption mechanisms mainly included electrostatic interaction, complexation, hydrogen bonding, n-π EDA effect and cation-π interaction. The self-floating high-performance PEI-LDH/CA beads exploited in this work provided fundamental support for the practical application of antibiotic-based wastewater treatment.

Topics: Adsorption; Anti-Bacterial Agents; Hydroxides; Kinetics; Tetracycline; Water Pollutants, Chemical

Removal of pharmaceutical wastes, especially antibiotics from aquatic systems is an imperative issue from both human-health and ecological perspectives. Herein, zwitterionic UiO-66/ZIF-8 binary MOF/polydopamine@cellulose acetate composite (UiO-66/ZIF-8/PDA@CA) were fabricated in the form of floated beads for the adsorptive removal of tetracycline (TC). The formulated composite beads were characterized by FTIR, XRD, SEM, BET, Zeta potential and XPS analysis tools. Under optimum adsorption conditions, the UiO-66/ZIF-8/PDA@CA composite beads demonstrated large specific surface area, good adsorption performance with a relatively short equilibrium time (60 min) and ease separation. Furthermore, the adsorption data fit Temkin > Langmuir > Freundlich with a maximal adsorption capacity of 290.69 mg/g at 25 °C, while the adsorption kinetics were well-described by pseudo-second order kinetics. The thermodynamics studies refereed that the adsorption process was endothermic and spontaneous. Besides, the floated UiO-66/ZIF-8/PDA@CA beads displayed better adsorption property for eight reuse cycles with a maximal removal (%) reached 67%, reflecting its promising applicability as reusable adsorbent for efficient removal of antibiotics from water bodies.

Topics: Adsorption; Anti-Bacterial Agents; Cellulose; Humans; Hydrogen-Ion Concentration; Kinetics; Metal-Organic Frameworks; Phthalic Acids; Tetracycline; Water Pollutants, Chemical

A clinical and microscopical (SEM) investigation has been carried out on the biocompatibility of cellulose acetate fiber tetracycline with 25% of tetracycline hydrochloride (Actisite R). A subject with advanced periodontal disease was selected and a pocket of 8 mm of PD was chosen. A segment of fiber was inserted into the pocket for 8 days. After removal, PD and GI clinical parameters were detected and the fiber removed was analyzed at the scanning electronic microscope. The results showed clinical signs of inflammation after removal of fiber. SEM analysis showed macrophagic reaction, a typical sign of inflammatory response to material. The study suggests the need of more biocompatible materials, easier to use as delivery system of antibiotics in the treatment of periodontal disease.

Topics: Adult; Anti-Bacterial Agents; Biocompatible Materials; Cellulose; Delayed-Action Preparations; Drug Combinations; Drug Delivery Systems; Drug Evaluation; Humans; Male; Microscopy, Electron, Scanning; Periodontal Pocket; Tetracycline