Comprehensive utilization of melon seed shell - UV spectrophotometry wastewater treatment

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2014-12-11

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Key words: ultraviolet spectrophotometer; comprehensive utilization of melon seed shell; US analytical instrument ; UV-1100; UV-1200

$Src="http://i.bosscdn.com/blog/nophoto.gif" /></p>hexavalent chromium can be absorbed through the skin and respiratory tract, causing damage to the stomach and liver and kidney, and possibly injuring the eye. Department, retinal hemorrhage, optic atrophy. When the drinking water exceeds 400 times, symptoms such as mouth smashing, diarrhea, and digestive disorders will occur; it will cause shortness of breath, cough and asthma, and short-term heart shock; cause toxicity of kidney, liver, nervous system and hematopoietic organs. When a large amount of heavy metals remain in the human body, it is easy to burden the organs in the body, especially the liver and gallbladder. When there are problems in these two organs, the metabolism in the human body will be disordered, cirrhosis, liver. Ascites is even more serious. Most of the melon seeds are discarded as fuel or waste, which causes great waste of natural resources and directly affects the comprehensive utilization value of the seeds. In recent years, the development and utilization of melon seed shells has gradually attracted people's attention, and research on its use in wastewater treatment has also been reported. 1 reagent and instrument potassium dichromate, spectrophotometer, constant temperature water bath, electric blast drying oven, hydrochloric acid, circulating water vacuum filter 2 solution 1000mg/LCr6+ solution, 0.6mol / L hydrochloric acid solution 3 experimental steps take 200mL A certain concentration of Cr6+ solution, adding activated carbon of melon seed shell, adjusting different acidity, stirring for a certain time, separating and removing solid matter by filtration, determining the concentration of Cr6+ by filtrate, and calculating the adsorption rate of activated carbon on Cr6+. The experimental conditions were fixed and the Cr6+ was adsorbed. The adsorbent after adsorbing Cr6+ was eluted with 0.6 mol/L hydrochloric acid solution, washed with deionized water until neutral, and then dried in a dry box for reuse. The change in the concentration of Cr6+ and the change in the adsorption rate were measured several times. Determination of hexavalent chromium: Elimination of the interference of ferric iron in sulfuric acid and phosphoric acid medium, using chromium indicator as indicator, titrating with ammonium ferrous sulfate, reducing hexavalent chromium to trivalent chromium, excess ammonium ferrous sulfate and The chromium indicator reacts and the solution is yellowish green as the end point. According to the amount of ammonium ferrous sulfate standard solution, the hexavalent chromium content in water is calculated. The reaction equation is as follows: 2Na2CrO4+7H2SO4+6FeSO4(NH4)2SO4â†’Cr2(SO4)3+2Na2SO4+6(NH4)2SO4+3Fe2(SO4) 3+8H2O0.2% chromium indicator: Weigh 0.2g of chromium indicator, dissolve it in 100mL 0.2% sodium carbonate solution, shake it, and store it in brown bottle. 0.4mg/mL hexavalent chromium standard solution: Weigh 1.1316g of potassium dichromate dried at 120 Â° C for 2h, dissolve and transfer to a 1000mL volumetric flask, shake. Ammonium ferrous sulfate standard solution: 25 g of ammonium ferrous sulfate was weighed, dissolved in 1000 mL (1+9) sulfuric acid, and filtered. Pipette 10mL hexavalent chromium standard solution, add 50mL water and 5mL (1+3) sulfuric acid and 5 drops of chromium indicator, titrate with ammonium ferrous sulfate standard solution until the color changes from purple red to yellow green. Calculation of the titer of hexavalent chromium in ammonium ferrous sulfate solution: T-1mL ammonium ferrous sulfate solution equivalent to milligrams of hexavalent chromium, mg/mL; consumption of V-ferrous ammonium sulphate solution, mL; The amount of water sample is adjusted to neutral pH, diluted to 50mL, added (1 + 3) sulfuric acid 5mL, (1+1) phosphoric acid 1mL, 5 drops of chromium indicator, ammonium ferrous sulfate standard solution titrated to color by purple Change to yellow-green as the end point, and subtract the blank value from the standard solution dosage of the test solution. Titrate of T-ammonium sulphate, mg/mL; volume of ferrous ferrous sulfate consumed by V1-titration, mL; volume of V-sampled water sample, mL. Determination of copper ion concentration: Take 5mL 10mg/L Cu2+ solution in 50mL colorimetric tube, add 5mL sodium borate buffer solution, 10mL 0.5g/L bicyclohexanone oxalyl dihydrazide solution, dilute to the mark with deionized water. Shake well, develop color for 10 min at room temperature, and measure the maximum absorption wavelength with a 1 cm cuvette and distilled water as a reference. Take 7 50mL washed colorimetric tubes, add 0, 1.00, 2.00, 4.00, 6.00, 8.00, 10.00mL 10mg / L Cu2+ standard solution with pipette, then add 5mL sodium borate buffer solution, 10mL0. 5g/L bicyclohexanone oxalyl dihydrazide solution, dilute to the mark with deionized water, shake well, develop color at room temperature for 10 min, use 1 cm cuvette, deionized water as reference, at the maximum absorption wavelength The absorbance was measured. 4 Data recording and finishing 4.1 Acidity influence (experimental conditions:) pH24681012Cr6+ concentration/mg/L Cr6+ adsorption rate/%4.2 Effect of adsorption time (experimental conditions:) adsorption time/min20406080100120Cr6+ concentration/mg/L Cr6+ adsorption rate/%4.3 adsorbent Effect of addition amount (experimental conditions:) Adsorbent addition amount/mg50100150200250300Cr6+ concentration/mg/L Cr6+ adsorption rate/%4.4 Effect of Cr6+ concentration (Experimental conditions:) Cr6+ concentration/mg/L50100150200250300Cr6+ concentration/mg/L Cr6+ adsorption rate/%4.5 Repeated experiment times / times 123456Cr6 + concentration / mg / L Cr6 + adsorption rate /% Keywords: ultraviolet spectrophotometer; comprehensive utilization of melon seed shell; US analysis instrument ; UV-1100; UV-1200</p> </div> </div> <div class="tech-detail-share">  <div class="bdsharebuttonbox"> <a href="#" class="bds_qzone" Data-cmd="qzone" title="Share to QQ space"></a> <a href="#" class="bds_tsina" data-cmd="tsina" title="Share Sina Weibo"></a> <a href="#" class="bds_weixin" data-cmd="weixin" title="Share to WeChat"></a> <span>Share to:</span> </div> <script>window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": "1", "bdMiniList": false, "bdPic": " ", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName($

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