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Xiaoguo Zhang Zhihong Chen Zhaoneng Wan Chali Liu Renze He Xiaoguang Xie Zhangjie Huang 《International journal of molecular sciences》2022,23(20)
Selective adsorption of palladium from metallurgical wastewater containing Pt (IV), Rh (III), Ca2+, Cu2+, Fe3+, Ni2+, Pb2+, V3+, and Ti4+ has tremendous economic and environmental benefits. In this paper, a novel thiadiazole-based chloromethyl polystyrene-modified adsorbent, viz. 2, 5-bis-polystyrene-1,3,4-thiadiazole (PS-DMTD), was synthesized using chloromethyl polystyrene as the backbone. The experimental results show that PS-DMTD can selectively separate Pd (II) from metallurgical wastewater in a one-step adsorption process. The calculated saturation adsorption capacity of PS-DMTD for Pd (II) was 176.3 mg/g at 25 °C. The separation factors of βPd (II)/Mn+ (Mn+: Pt (IV), Rh (III), Ca2+, Cu2+, Fe3+, Ni2+, Pb2+, V3+, and Ti4+) were all higher than 1 × 104. FT-IR, XPS, and single-crystal X-ray diffraction showed that the adsorption of Pd (II) to PS-DMTD was primarily through a coordination mechanism. Density functional theory (DFT) calculations revealed that the other base metal ions could not coordinate with the PS-DMTD. Pt (IV) could not be adsorbed to PS-DMTD due to its strong chlorophilicity. Furthermore, Rh (III) existed as a polyhydrate, which inhibited Rh (III) diffusion toward the positively charged absorption sites on the PS-DMTD. These results highlight that PS-DMTD has broad application prospects in the recovery of Pd (II) from metallurgical wastewater. 相似文献
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以季戊四醇为原料经卤代、氧化、热分解三步主要反应合成了3-卤-2-卤甲基-1-丙烯.卤代反应中采用不同的卤代剂合成了三卤代新戊醇,在文献基础上加入以二氯甲烷为萃取剂的萃取过程可使三卤(氯)新戊醇产率达72%-98%;再通过氧化反应得到三卤(氯或溴)新戊酸,同样加入萃取过程可使酸的产率达到63%-80%,最后热分解脱卤化氢和二氧化碳制备3-卤-2-卤甲基-1-丙烯时(卤素为氯和溴),在文献基础上加入吡啶作催化剂可使热分解温度降至200 ℃(原分解温度为260 ℃),总产率可达45%-72%.在制备3-碘-2-碘甲基-1-丙烯时避光搅拌,可降低产物分解,产率为60%.所有的化合物经过了IR和1HNMR的确认. 相似文献
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A series of thermosensitive copolymeric hydrogels were prepared from various molar ratios of N‐isopropylacrylamide (NIPAAm) and poly(ethylene glycol) methylether acrylate (PEGMEAn), which was synthesized from acryloyl chloride and poly(ethylene glycol) mono methylether with three oxyethylene chain lengths. Investigation of the effect of the chain length of oxyethylene in PEGMEAn, and the amount of the PEGMEAn in the NIPAAm/PEGMEAn copolymeric gels, on swelling behavior in deionized water was the main purpose of this study. Results showed that the swelling ratio for the present copolymeric gels increased with increasing chain length of oxyethylene in PEGMEAn and also increased with increase in the amount of PEGMEAn in the copolymeric gels. However, the gel strength and effective crosslinking density of these gels decreased with increase in swelling ratio. Some kinetic parameters were also evaluated in this study. Finally, the drug release and drug delivery behavior for these gels were also assessed. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1683–1691, 2003 相似文献
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1,4-双(氯甲基)-2-甲氧基-5-辛氧基苯及聚合物的合成 总被引:2,自引:0,他引:2
由对甲氧基苯酚(MOPh)合成出一种可溶性电致发光共轭聚合物聚(2-甲氧基-5-辛氧基)亚苯基亚乙烯(PMOOOPV)大致过程为:由MOPh与1-溴辛烷合成1-甲氧基-4-辛氧基苯(MOOOB)继而合成了1,4-双(氯甲基)-2-甲氧基-5-辛氧基苯(BCMMOOOB)碱性聚合得可溶性PMOOOPV。并做了BCMMOOOB与其它单体的共聚,对中间体及聚合物用^1HNMR进行了表征。 相似文献
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J. Prasad RaoKurt E. Geckeler 《Progress in Polymer Science》2011,36(7):887-913
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Jian‐Mei Lu Qing‐Feng Xu Xin Yuan Xue‐Wei Xia Jin‐Xing Zhai Li‐Hua Wang 《应用聚合物科学杂志》2007,104(1):75-80
End‐functionalized polystyrene (PSt) was synthesized via atom‐transfer radical polymerization (ATRP) by using 4‐chloromethyl benzoic acid (CMBA) and the ethyl‐protected carboxylic acid, ethyl 4‐chloromethybenzenecarboxylate (ECBC), as initiators respectively. The structure of PSt proved the living‐radical polymerization. Results exhibit both ATRP initiators afforded well‐controlled polymerization with high initiator efficiencies. However, the study also shows the controllability of ATRP can be obviously influenced by using different initiator in different catalyst system. Furthermore, the terminal group of the PSt1, benzoic acid, can coordinate with Europium(III) ion to obtain the polymeric Eu(III) complex, which shows both emissions of polymer and Eu(III) ion. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献