Search

Hydrogen peroxide (H2O2) is a remarkably strong oxidant, and its vapour ([H2O2]g) has further advantages, such as a low cost and good light transmission. However, there has been very little research on its removal through gas-phase advanced oxidation (GPAO). In the present study, the photochemical oxidation of a gas that contains a series of benzene derivatives using ultraviolet (UV) irradiation and [H2O2]g was investigated in a transparent bag made of fluorinated ethylene propylene (FEP). UV and [H2O2]g barely reduced the pollutant within 5 h when used alone, and the reactant was also stable. When the pollutant concentration was high (248 to 756 mg/m3) and the residence time was short (3 s) compared with related studies on the removal of benzene, toluene and xylene, the apparent removal rate by UV/[H2O2]g/(powder active carbon, PAC) was higher than when other methods (UV/[H2O2]g, UV/[H2O2]g/TiO2 and UV/[H2O2]g/ZnO), were used. However, it was found that the mineralization by UV/[H2O2]g significantly decreased, which in turn decreased the conductivity after the reaction. Increasing the pollutant concentration and the pH of the H2O2 had a negative effect on the treatment, but the UV radiation had a positive effect at powers of up to 40 W. In addition, the characteristic absorbance of three benzene derivatives showed that the key structure of the pollutant molecules was damaged during GPAO. Supplementary Information The online version contains supplementary material available at 10.1007/s11356-021-16920-w.

Total laparoscopic Roux-en-Y cholangiojejunostomy may be a first choice for patients with biliary disease that requires biliary-jejunal anastomosis., Background and Objectives: Roux-en-Y cholangiojejunostomy (RCJS) has been widely used in biliary bypass surgeries, but in most reported literature, an assisted mini-incision was needed, and studies reporting total laparoscopic Roux-en-Y cholangiojejunostomy (TLRCJS) are rare. The goal of this study was to investigate how to treat hepatic portal bile duct diseases and perform jejunojejunostomy and cholangiojejunostomy totally laparoscopically. We evaluated the feasibility of TLRCJS in treating biliary tract diseases. Methods: TLRCJS were performed in 103 patients from January 2000 to August 2011. There were 28 cases of recurrent choledocholithiasis combined with stricture of the common bile duct (CBD) after several stone extractions, 3 patients with iatrogenic bile duct injury, 24 patients with choledochal cyst, 36 patients with hepatic portal cholangiocarcinoma, and 12 patients with cancer of the pancreatic head and periampullary cancer. All surgeries were performed through 5 trocars. First, laparoscopic surgery on the CBD was performed according to the original disease. The CBD was opened and stones were extracted in choledocholithiasis patients. In iatrogenic injury patients, strictured CBD was resected and repaired. Dilated CBD or choledochal cyst with tumor was transected. In patients with malignant jaundice, the CBD was opened longitudinally. At the same time, the bile duct was prepared for cholangiojejunostomy. Second, the positions of the laparoscope and surgeons were altered. The jejunal mesentery and jejunum were transected, and side-to-side jejunojejunostomy (JJS) was performed. The laparoscope and surgeon positions were exchanged again; the Roux-en-Y biliary limb was lifted close to the residual bile duct; and side-to-side or end-to-side choledochojejunostomy (CJS) was performed. Finally, an abdominal drainage tube was placed. Results: All the surgeries were performed successfully. The diameter of the residual bile duct ranged from 0.4 to 3.2 cm (average, 0.9 cm). Three patients had postoperative bile leakage and were treated from 1 week to approximately 1 month with abdominal drainage. Postoperative intraperitoneal hemorrhage and stress ulcer of the stomach occurred in 2 patients with biliary tract injury combined with obstructive jaundice. One with intraperitoneal hemorrhage was cured by another laparoscopic surgery. The other patient was cured after 2 days of abdominal drainage, antacids, and hemostatic drug therapy. The follow-up duration of 95 patients was 4 to 93 months (average, 48.3 months). The follow-up rate was 92.2% (95/103). Patients with cancer died of metastasis or cachexia during 14-month follow-up with no postoperative complication. Reflux cholangitis occurred in 3 patients 2, 3, and 5 years after the operation, respectively. No anastomotic stricture or other complication was found in other patients during the follow-up. Conclusions: TLRCJS is the best and first choice for patients with biliary tract diseases that need biliary-jejunal anastomosis. But it is essential that the surgeon has proficiency in laparoscopic surgeries.

Background and objectives To investigate the possibility of extracting common bile duct (CBD) stones by laparoscopically inserting choledochoscope through the natural orifice of the cystic duct and a mini-incision on the CBD, and the safety of laparoscopic primary double-layer suture of the cystic duct and CBD. Methods Laparoscopic transcystic choledochotomy and extraction of stones with primary suture was performed on 194 patients with gallbladder and CBD stones from October 1, 2009, through April 30, 2012. The cystic duct was left at a diameter of 1 to 1.5 cm after removal of the gallbladder. The duct was longitudinally cut at its ventral side to the confluence with the CBD, and the anterior wall of the CBD was also cut longitudinally. A choledochoscope was then inserted via the enlarged opening, and the stones were extracted from the CBD. Finally, the CBD and cystic duct were closed by continuous mucous layer suture and seromuscular Lembert suture, respectively. The cystic duct was ligated close to the CBD and an abdominal drainage tube was placed. Results All surgical procedures were successfully performed. The caliber at the confluence between the cystic duct and the CBD was 0.3 to 0.8 cm (SD 0.4 ± 0.1 cm), and the mini-incision of the CBD was 0.1 to 1.1 cm (SD 0.3 ± 0.2 cm). Abdominal drainage lasted 3 to 5 days. Magnetic resonance cholangiopancreatography (MRCP) in 55 patients showed no abnormal change in the CBD diameter. Two patients had bile leakage. Another patient had intermittent abdominal pain and jaundice 5 to 7 days postoperatively, and the retained stones spontaneously passed. The postoperative hospital stay was 6 to 13 days (SD 8 ± 2.1 days). Observation of 176 patients (90%) lasting 1 to 30 months (SD 11 ± 8 months) showed no recurrent stones or stricture of the CBD. Conclusion The surgical procedure of laparoscopic transcystic choledochotomy and extraction of stones with primary suture is feasible and safe.