Cr(VI) and phenol are toxic contaminants that need to be treated, and different methods have been researched to simultaneously remove these two contaminants from industrial wastewater. In this study, Cr(VI) was used as a novel Fenton-like catalyst in phenol degradation by H2O2. In the pH range of 3.0‒11.0, the degradation efficiency of phenol decreased with elevated pH. At pH = 3.0, 100 mg/L phenol was effectively degraded by 2 mmol/L Cr(VI) and 20 mmol/L H2O2. At pH = 7.0 and the same conditions as those of pH = 3.0, 79% of 100 mg/L phenol was removed within 6 h, which was an improvement in pH limitation compared with the Fe(II)-mediated Fenton reaction. Quenching experiments indicated that ·OH generated from the catalysis of H2O2 by Cr(V) instead of Cr(VI) was the primary oxidant that degraded phenol. When pyrophosphate was added in the Cr(VI)/H2O2 system, complexes with the Cr(V) intermediate rapidly formed and inhibited H2O2 decomposition, implying that the decomposition of H2O2 to ·OH was catalyzed by Cr(V) instead of Cr(VI). The presence of anions such as chloride and sulfate had insignificant effect on the degradation of phenol. TOC and UV analyses suggest that phenol could not be completely oxidized to CO2 and H2O, and the intermediates identified by high performance liquid chromatography further indicates that maleic acid and benzoquinone were intermediates which may be further degraded into short chain acids, primarily maleic, formic, acetic, and oxalic acids, and eventually into CO2 and H2O. Considering that more than 50% Cr(VI) can also be removed during this process, the Cr(VI)/H2O2 system is more appropriate for the simultaneous removal of Cr(VI) and phenol contaminants from industrial wastewater.
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共查询到18条相似文献，搜索用时 703 毫秒
1.
以苯酚作为唯一碳源和能源的无机盐培养液对从绝缘材料厂排放的活性污泥进行驯化,从中分离筛选到1株苯酚降解菌,编号为JY04.采用正交实验设计方法优化了该菌株固定化条件,并且考察了该固定化细胞降解苯酚的最适条件.结果表明:在固定化条件为海藻酸钠(SA)浓度为5%,湿菌重/包埋剂为6/30,CaCl2浓度为3%时,固定化时间为8 h,降解率可达82.6%,并具有较好的机械强度.确定其对苯酚降解最适条件为pH 7.0,苯酚浓度为400 mg/L,温度32℃,接种量为25 g,培养时间42 h,其苯酚的降解率可达97.3%.该菌株固定化细胞的降解苯酚能力和耐受苯酚能力均大于游离细胞.固定化菌株对苯酚有较强的降解和耐受能力,是处理苯酚废水的良好菌种资源. 相似文献
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《绵阳师范学院学报》2018,(8):5-11
以海藻酸钠作为包埋载体,对苯酚降解菌株JY03进行细胞固定化,并对降解条件进行了优化分析.通过单因素试验确定了合适的固定化条件为:海藻酸钠浓度2.5%,CaCl_2浓度3.0%,包埋菌体量0.3 g,钙化时间8 h.固定化细胞降解苯酚的最适条件为:温度32℃,pH值6.5,接种量30 g,对苯酚浓度800 mg/L降解36 h,其降解率达到88%以上.菌株JY03通过海藻酸钠固定化对苯酚的降解能力与耐受能力均大于游离细胞,这将为进一步采用固定化微生物方法处理含酚废水提供了试验依据. 相似文献
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王太平 《河南科技学院学报》2011,39(1)
从某焦化厂排水沟采集到污泥,通过以苯酚为惟一碳源的培养基逐步驯化,筛选出苯酚高效降解菌株.利用形态观察、生理生化枪测、16S rDNA序列分析进行初步鉴定.结果筛选获得1株高效降解苯酚的球形芽孢杆菌HNND-3.HNND-3能够以苯酚为惟一碳源,耐酚能力高达2 200 mg/L,在30℃和pH 7.0条件下,42 h内能将800 mg/L的苯酚彻底降解. 相似文献
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《绵阳师范学院学报》2018,(11):89-92
生物降解含酚废水是一种既经济、有效而又无污染的方法,固定微生物可以加快酚降解和提高苯酚的忍耐能力,为此本试验以固定化菌株JY04作为研究对象,考察苯酚质量浓度、培养时间、p H值、温度、接种量对降解苯酚性能的影响.结果表明,初始苯酚浓度为600 mg/L,p H值为6. 58. 0,最适接种量为45 g,温度为28℃8. 0,最适接种量为45 g,温度为28℃34℃,在此条件下将固定化菌株JY04培养48 h,其苯酚降解率可达到93. 6%. 相似文献
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王太平 《河南职业技术师范学院学报(职业教育版)》2011,(1):43-46,55
从某焦化厂排水沟采集到污泥,通过以苯酚为惟一碳源的培养基逐步驯化,筛选出苯酚高效降解菌株.利用形态观察、生理生化枪测、16S rDNA序列分析进行初步鉴定.结果筛选获得1株高效降解苯酚的球形芽孢杆菌HNND-3.HNND-3能够以苯酚为惟一碳源,耐酚能力高达2 200 mg/L,在30℃和pH 7.0条件下,42 h内... 相似文献
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《绵阳师范学院学报》2017,(11):70-75
以从绝缘材料厂的活性污泥中筛选到的1株苯酚降解菌作为试验对象,以聚乙烯醇(PVA)为包埋剂,氯化钙(CaCl_2)为固定剂制成固定化小球,通过研究不同包埋条件对固定化小球性能的影响来确定最佳包埋条件.结果表明,该菌株包埋的最适条件:聚乙烯醇的质量浓度12%、Ca Cl2的质量浓度5%、菌胶比0.8/30、交联时间12 h,苯酚降解率达到82.5%,且包埋后的小球机械强度和传质性能都比较好.这将为进一步采用固定化包埋技术处理含酚废水的深入研究提供了实验依据. 相似文献
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闫晔 《化工职业技术教育》2009,(Z1)
以纳米TiO_2为催化剂的光催化氧化技术是一种新型的废水处理技术,具有高效、价廉、无二次污染、成本低等优点,受到广泛关注。本文利用纳米TiO_2催化剂对模拟苯酚废水进行光催化处理,研究了光源种类、pH值、苯酚初始浓度、催化剂的用量、添加H_2O_2对降解过程的影响。通过实验确定:改变催化剂的投加量,调节适当的pH值,减小溶液的初始浓度,适当加入H_2O_2氧化剂等方法,可以提高含酚废水的处理效率。当苯酚溶液初始溶度为100mg/L,催化剂的用量为1.5g/L,溶液pH=4,氧化剂H_2O_2用量为2.5ml/L时,紫外光照反应4hr,苯酚降解率可达56%。苯酚浓度不高时,光催化降解反应符合一级动力学方程。 相似文献
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本文主要就乙酸乙酯萃取含苯酚废水时被萃取的物质是苯酚还是酚铁配合物进行了实验探讨,并基于满足实验现象明显的前提下尽可能降低所配制的含苯酚废水浓度的要求,还对含苯酚废水浓度进行了探究,最后设计了“不同萃取剂萃取苯酚能力强弱的探究方案”,可供同行参考。 相似文献
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本实验对国标HJ 503-2009有关苯酚浓度的测定方法做了一些改进,同时考察了高级氧化法及无机物的协同作用对苯酚去除效果的影响。结果表明,苯酚标准贮备液ρ(C6H5OH)≈1.00 g/L的标定用约0.025 mol/l Na2S2O3标准溶液较合适,浓度在240mg/l范围的苯酚溶液用紫外分光光度法测定具有可行性且较为合适。us/O3处理方式对苯酚的去除有一定的作用,无机物的加入增强了us/o3协同氧化降解苯酚废水的效果,提高了苯酚去除率。在超声波频率为59KHz,功率315w下先超声30min,再us/O3协同处理以6mg/min流量通臭氧30分钟,氯化镁的质量0.1g条件下,可使10mg/l苯酚废水的苯酚去除率提高到92%。 相似文献
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李锐 《兰州石化职业技术学院学报》2014,(4):8-10
通过正交实验和单因素实验探索了Fenton氧化炼化废水中苯酚的最佳工艺条件。实验结果表明,Fenton试剂处理苯酚废水时,各影响因素的作用大小顺序是:p H反应温度H2O2投加量反应时间Fe SO4·7H2O投加量;最佳氧化反应条件为:p H=3.5,反应温度为20℃,H2O2投加量为12 m L·L-1,反应时间为30min,Fe SO4·7H2O投加量为450 mg·L-1,此时废水中苯酚的去除率为89.26%,残余苯酚含量为11.76 mg·L-1。因此,用Fenton氧化法处理含苯酚废水是一种非常有效的方法。 相似文献
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制备了磷钨杂多酸季铵盐-磷钨酸四甲基铵并对其进行了初步表征。在光催化反应仪中,以紫外灯为光源,以磷钨酸四甲基铵为光催化剂,探讨了光催化降解苯酚的最佳条件。实验结果表明,对于10mg／L的苯酚溶液。催化剂投加量为1．5g／L,在300W高压汞灯照射下,光催化降解8h,去除率可达89．9％,TOC去除率达85．1％。 相似文献
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采用二氧化钛光催化结合掺硼金刚石电催化来提高污染物氧化效率.以苯酚作为模型废水污染物,分别比较了采用BDD电催化和TiO2光催化以及两者结合方法的降解过程,研究了电流密度和初始浓度等条件对降解效果的影响,并进行了反应动力学讨论.实验结果表明：与单独处理相比, BDD和TiO2组合处理方法拥有较优的苯酚去除效果,尤其是先电解后光催化的方式,其最优工作电流密度为25.48mA/cm2,并且随着苯酚初始浓度增加,去除率随之下降.动力学研究表明反应符合准一级动力学方程. 相似文献
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Trimeric quaternary ammonium surfactants are newly developed surfactants, their widespread synthesis and utilization results in a great amount of scouring wasterwater of high COD, which is unmanageable. The present investigation aims to find a new type of organo-bentonites modified by the scouring wastewater and to treat the scouring wastewater at the same time. Results of adsorption experiments of phenol and formaldehyde by the modified bentonite show that, at the optimal ratio 24 % (W/V) of modified bentonite to scouring wastewater, the removal rate of phenol and formaldehyde by FTAT scouring wastewater modified bentonite is 3.53 times and 2.48 times higher than that of Na-bentonite, and the COD of treated scouring wastewater reduces to below 200 mg/L, meeting the second level of Standards for Discharge of Water Pollutants from the Ammonia Industry of China. 相似文献
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1IntroductionIn recent years,tri meric quaternary ammoniumsur-factants,which have three hydrophobic and three hy-drophilic groups connected bytwo spacer chains,havebeen developed[1-5].The tri meric surfactants appearunique physicochemical properties such … 相似文献
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Para-tert-butyl phenol (p-TBP) and 2,4-di-tert-butyl phenol ( 2,4-DTBP) are wi.dely used for the preparation of antioxidants. Zeolite catalysts showed good performance for the synthesis of p-TBP and 2,4-DTBP. In this work, zeolite H-mordenite (HM) catalyst was prepared and the alkylation of phenol with tert-butyl alcohol over zeolite HM catalyst was investigated at different reaction conditions. It is found that increasing temperature enhances the selectivity to p-TBP and the optimum reaction temperature for phenol conversion is 438 K. Increasing flow rate decreases phenol conversion apparently while the selectivity to p-TBP has a little increase. The suitable tert-butyl alcohol/phenol molar ratio is 2. Lower alcohol/phenol molar ratios are beneficial to p-TBP while higher ones are helpful for producing 2,4-DTBP. 相似文献
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